Product Specifications

PSS 2A-1F4 C

I/A Series® Intelligent Multimeasurement TransmitterModel RTT25 Temperature Transmitterwith FOUNDATION® Fieldbus Communication Protocol

This transmitter receives input signals from RTDs, thermocouples, ohms, milliamperes, or millivolts. It receives

power from, and communicates digitally over, the Foundation Fieldbus segment. It is registered with the Foundation and has passed interoperability tests. Device descriptions, on file with the Foundation, are supplied to ensure operability with any Host supporting the FOUNDATION Fieldbus protocol.

FEATURES• FOUNDATION Fieldbus 31.25 kbits/s, Voltage

Mode, MAU specification compliant• Interoperability tested – FOUNDATION registered• High digital precision, stability, and resolution to

ensure accurate measurement and performance• Available with single or dual inputs• True dual sensor capability for averaging,

difference, redundant, or independent use• One unit configurable for all T/C, RTD, mV, mA,

ohm, and custom inputs• Self-diagnostics and self-calibration• Multidrop Fieldbus supports point-to-point, bus,

and tree topologies• 4 to 20 mA to FOUNDATION Fieldbus converter

• Available as a basic amplifier (no enclosure), or in an aluminum or 316 ss NEMA™ 4X/IEC IP66 enclosure as follows:– For surface/pipe mounting, remote sensor– Enclosure with integrally mounted bare sensor– Enclosure with sensor for Thermowell mount.

• Transmitter configuration locally via the LCD Indicator, or remotely over Fieldbus

• Transmitter includes Fieldbus function blocks• Supports all standard views, alarm messages,

and trends• Transmitter firmware is updatable in the field • Conforms to applicable European Union

Directives (product marked with “CE” Logo)• Standard 2-year warranty

PSS 2A-1F4 CPage 2

GENERAL DESCRIPTION - I/A Series TEMPERATURE TRANSMITTER

MULTIPLE MEASUREMENTS

The transmitter is available for single measurements, including seven different RTDs (2-, 3-, or 4-wire), eleven different thermocouples, millivolts, milliamps, and ohms. Additional sensor flexibility is provided with the custom curve and the ability to have the output linear with temperature or humidity. The transmitter is also available with dual sensor measurements, as long as the sensors are the same type. This provides the capability for averaging, difference, or redundant measurements.

DUAL INDEPENDENT MEASUREMENTS

The multiple measurement feature combined with the FOUNDATION fieldbus digital output allows one transmitter to be used for two individual process measurements, which can reduce the number of transmitters required by 50%.

4 to 20 mA-to-FOUNDATION FIELDBUS CONVERTER

The single or dual input transmitter accepts a mA signal. This allows the conversion of 4 to 20 mA signals to the fieldbus segment, which can be of tremendous benefit by integrating legacy devices not available with FOUNDATION fieldbus protocol.

VERSATILE HIGH PERFORMANCE TRANSMITTER

A wide range of packaging and sensor types makes this transmitter suitable for virtually all temperature measurement applications. The microprocessor-based electronics eliminates ambient temperature effects and results in high accuracy, repeatability and linearization of the sensor signal.

EFFICIENT AND DURABLE

Industrial-grade integrated circuits and sealed electronics combine to make this microprocessor-based transmitter an efficient and durable device.

AUTOMATIC SELF-CALIBRATION

This transmitter has an advanced automatic self-calibration routine that greatly extends the time between recalibrations. Every three seconds, the transmitter checks the zero and full scale output against highly accurate and stable internal voltage signals that are referenced back to the factory calibration stored in non-volatile EEPROM memory. Any necessary adjustments are made automatically without interrupting the output signal.

CONFIGURATION STORAGE

All configurable parameters are stored in non-volatile EEPROM memory and retained when power is removed from the transmitter. The transmitter is ready for immediate use when repowered.

MULTIPLE PACKAGING CONFIGURATIONS

The transmitter (Figure 1) is suitable for use in a variety of applications. Transmitters with integrally mounted sensor have an environmentally protected enclosure and are mounted directly to the process. Surface- and pipe-mounted configurations allow the transmitter to be mounted remotely from the process. The transmitter is also available with DIN-mounting hardware, and as a basic transmitter package (must be mounted in EMI-Shielded enclosures provided by user). Built-in protection from vibration and radio frequency interference (RFI) are also provided.

Figure 1. Multiple Packaging Configurations

INTELLIGENT NOISE FILTERING

Innovative filtering automatically eliminates noise while maintaining fast response to rapid input changes. It provides a highly accurate and smooth output signal without the need for excessive damping. A digital filtering algorithm (signal conditioner) is active over a band of input fluctuations. Any sensor noise is eliminated while the conditioned signal reacts immediately to any large input change. This allows the transmitter to be used in a wide variety of electrically noisy installations.

When there is a rapid signal change, the smoothing band is immediately exceeded, and the output of the signal conditioner uses this change as the basis for the output signal. As long as the input fluctuates or moves at a rate that is outside the band, the output instantly tracks the input signal. Once the input settles at a new value, the filtering algorithm is automatically reactivated, eliminating noise and producing an accurate and stable output.

CUSTODY TRANSFER/SECURITY JUMPER

The configurator pushbuttons, and any remote configurator, can be disabled via the mechanical write protection jumper.

FOR PIPEOR SURFACEMOUNTING

BARE SENSOR

BASIC

DIN RAILMOUNT HOUSING

THERMOWELL

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LCD INDICATOR/CONFIGURATOR OPTION

The versatile indicator (Figure 2) plugs into the transmitter and provides the following features:

• Highly Accurate – Microprocessor driven indicators provide excellent accuracy.

• Local Configuration – The indicator has two pushbuttons to reconfigure some of the transmitter database without using a separate configurator. Configuration menu messages of the indicator are configurable in English, French, German, Italian, or Spanish.

• Security – The pushbuttons for local configuration can be disabled by any remote configurator for security.

• Non-Interactive – Transmitter output is unaffected whether inserting/removing indicator, reading parameters, or by indicator failure.

• Highly Visible Measurement Display – Top line of indicator has six 8 mm (0.31 in) high digits. Negative values are displayed with a minus sign.

• Configurable Display – Top line of the indicator can display output from Input 1, Input 2, or Dual Values.

• Innovative Features – The indicator’s 2nd line is an eleven-segment bargraph that displays readings in % of calibrated range. Temperatures outside the calibrated range are indicated by a left-pointing (underrange) or right-pointing (overrange) arrow. The 3rd line displays a user-configurable tag number on a 6 mm (0.25 in) high, seven-character, alphanumeric display. This line also automatically displays “FAILSAFE” if a transmitter or sensor failure has occurred.

• Transmitter Operational Status Check – Either displays “MODULE WORKING PROPERLY” message or displays any activated internal error messages.

• Portable – A single indicator can be used for multiple transmitters. Simply plug it in, make desired readings and/or adjustments to the transmitter, unplug the indicator, and install it in the next transmitter.

SENSOR MATCHING

Sensor accuracy can be the largest error in a temperature measurement. Foxboro offers standard and high accuracy RTDs for improved measurement accuracy. In addition, the sensor’s Callendar-Van Dusen coefficients can be entered into the RTT25, which greatly improves the overall measurement accuracy.

Figure 2. LCD Indicator/Configurator Option

TRUE 4-WIRE DUAL RTD MEASUREMENT

The RTT25 has eight sensor screws to allow for the improved measurement accuracy and ambient temperature correction of 4-wire RTD measurements. Some manufacturers use less than eight sensor screws and the installation instructions mention that if you want dual 4-wire RTD measurement, you should “leave the unneeded leads disconnected and insulated with electrical tape.” This approach will convert the 4-wire RTDs into 3-wire RTDs.

REDUNDANT OPERATION

When configured for dual redundant measurement, if sensor #1 fails, the measurement is immediately switched to sensor #2 without interrupting the output signal. The transmitter diagnostics will also send a message to any remote configurator that sensor #1 has failed. In addition, the optional LCD Indicator will flash “FAILSAFE” to alert the user to change the sensor.

REAL WORLD PERFORMANCE

The transmitter nonvolatile memory stores many coefficients to eliminate errors. Every transmitter is factory tested from -40 to +85°C (-40 to +185°F) ambient temperature, and the error coefficients, along with the curves for all sensor types, are stored in the nonvolatile memory. Therefore, the accuracy specification is applicable merely by choosing the sensor type and calibrated range, without the need for any calibration equipment. In addition, the internal cold junction sensor not only compensates for a thermocouple measurement, but its temperature is used to compensate any ambient temperature error, no matter what sensor type is selected.

BASIC TRANSMITTER

PLUG-IN INDICATOR

LCDINDICATOR WITHPUSHBUTTONS

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INSTALLATION ASSISTANT

Let Foxboro be your Installation Assistant. When you order a transmitter with an integral sensor and thermowell, everything is assembled, tagged, wired, calibrated, and configured to your specifications. Just open the shipping container and install. This feature is ordered by specifying Package Configuration Code L or M, along with Option -D2. See Figure 3.

SENSOR AND OUTPUT TERMINAL

Wiring some temperature transmitters can be difficult due to the number of connections and space limitations inside the housing. Foxboro has streamlined the wiring by using spring loaded Phoenix connectors. Just strip some of the insulation off the wires and simply push the wires into the connector. Also, the transmitter is labeled with the most popular sensor connections to eliminate the need to read the instruction manual.

RUGGED AND RELIABLE SENSORS

Foxboro supplied integral sensors are high quality and rugged construction. The RTDs are 4-wire high-vibration resistant wire-wound construction designed for maximum accuracy and longevity.

Figure 3. RTT25 with Integral Sensor with Thermowell

ULTIMATE SPARE TRANSMITTER

The RTT25 is available with single or with dual measurement capabilities with slight added cost. Keeping a dual measurement transmitter as a spare allows it to be the replacement for any existing temperature transmitter.

FIELDBUS TECHNOLOGY

INTRODUCTION

The FOUNDATION fieldbus is an all digital, serial, two-way communication system which interconnects field devices, such as transmitters, actuators, and controllers. It is a Local Area Network (LAN) with built-in capability to distribute control application across the network. This technology consists of the Physical Layer, the Communication Stack, and the User Application Blocks.

Physical Layer Standards

The Fieldbus Foundation uses IEC 1158-2 and ISA S50.02 Physical Layer Standards as references to define, as a minimum, the signaling and electrical properties of a fieldbus device’s Physical Layer interface. The properties of these transmitters are:

• Polarity Independent• Open Circuit Level of 35 V dc maximum• Intrinsically Safe Parameters per table below.

Communication Stack

The Communication Stack comprises a Fieldbus Access Sublayer (FAS), a Data Link Layer (DLL), and a Fieldbus Message Specification (FMS).

The Fieldbus Access Sublayer (FAS) provides:• Client/Server VCR (Virtual Communication

Relationship) – This is used for queued, unscheduled, user-initiated, one-to-one communication between the devices on the fieldbus; typically user-initiated requests, such as set-point changes, alarm acknowledgments, and device uploads/downloads.

• Report Distribution VCR – Typically allows fieldbus devices to send alarm notifications to operator console.

• Publisher/Subscriber VCR – Allows fieldbus device to publish data, and send function block I/O data, such as transmitter process variable and primary output data to operator console.

THERMOWELLWITH EXTERNALTHREAD SHOWN

EXPLOSIONPROOF UNION

RTT25 WITHALUMINUMOR 316 ssHOUSING

INSERTIONLENGTH

Parameter Recommended Value

Approval Voltage 24 V dcApproval Current 250 mAInput Power 1.2 WResidual Capacitance < 5 nFResidual Inductance < 20 µH

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Communication Stack (Cont.)

The Data Link Layer (DLL) provides:• Scheduled Communication – As authorized by

the Link Active Scheduler (LAS)

• Unscheduled Communication – This allows all devices on the fieldbus to send “unscheduled” messages between the transmission of scheduled messages.

The Fieldbus Message Specification (FMS)

FMS services allow user applications to send messages to each other across the fieldbus. The FMS describes communication services, message formats, and the protocol required for the user application.

User Application Blocks

These are software blocks which represent different types of user application functions. The types of blocks used are Resource Blocks, Function Blocks, and Transducer Blocks (see Figure 4).

User Application Blocks (Cont.)

Resource Block (One per Device)

This block identifies the transmitter and includes data such as the device name, serial number, device description (DD), manufacturer ID, device type, device revision, DD revision, and diagnostics. There are over 40 available parameters in the resource block

Analog Input (AI) Function Block

Analog Input (AI) function blocks contain the configurable parameters needed to define the measurement for use with other function blocks. Available parameters in the AI block include revision level, tag description, alarms, process variables, transducer scale values, and strategy.

Transducer Block

The transducer block contains the actual measurement(s). Other parameters include the calibrated range, EGUs, sensor range limits, sensor configuration, linearization, reranging, temperature compensation, and diagnostics.

Figure 4. RTT25 Functional Block Diagram with FOUNDATION Fieldbus

Analog to DigitalConverter

Complete ConfigurationCorrection CoefficientsFactory Calibration Curves

Nonvolatile Memory

Self-CalibrationVoltage Standards

Internal ColdJunction

FOUNDATION fieldbus:31.25 kbits/s

Communication Modem

InputMulti-plexer

1

2

3

4

5

6

7

8

+

Optional LCD Indicator with Pushbuttons for Local Configuration

To FieldbusNetwork

ConfigurableInput(s)

RTD, T/C, mA,mV, ohm and External Cold Junction.

Transducer BlockParameters Include· Actual Measurement(s)· EGU's· Calibrated Range· Sensor Range Limits· Sensor Configuration· Linearization· Reranging· Temperature Compensation· Diagnostics

Resource BlockParameters Include· Device Description (DD)· DD Revision· Device Type· Device Type Revision· Manufactures ID· Diagnostics

Function Blocks· Single Sensor AI· Dual Sensor AI1, AI2, AI3

User Application Blocks

Input/Output

Isolation

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OPERATING, STORAGE, AND TRANSPORTATION CONDITIONS

(a) Temperature operative limit extended to -50°C (-58°F) using Optional Selection “-J.”(b) 10 m/s (1g) maximum with Package Configuration Code M, T, or Y.

PERFORMANCE SPECIFICATIONS(1)

Accuracy(1)

Refer to Table 1. The accuracy specification is applicable merely by choosing a sensor type and calibrated range without the need for any calibration equipment.

Long-Term Stability<0.05% of input reading per year

Ambient Temperature EffectError is less than 1/2 the reference accuracy plus 0.1°C per 28°C (50°F)

Relative Humidity Effect (Noncondensing)<0.01 mV; <0.05 Ω; from 0 to 95% RH

Supply Voltage, Output Load, Vibration, and Mounting Position Effects

Negligible within normal operating conditions

Switching and Indirect Lightning TransientsTransmitter can withstand a transient surge to 2000 V common mode or to 1000 V normal mode without permanent damage. Output shift is <1.0%. (Per ANSI/IEEE C62.41-1980 and IEC Std. 801-5.)

FUNCTIONAL SPECIFICATIONS

Output SignalFOUNDATION fieldbus digital, serial, two-way communication system that runs at 31.25 kbits/s. The Manchester-encoded digital output signal is superimposed on the dc power signal on the bus, and conforms to IEC 1158-2 and ISA 50.02. The transmitter output can be linear with temperature (°F, °C, K, or °R), linear with input (mV, ohms, or mA), or linear with Dewpoint. The internal or external Cold Junction (CJ) sensor automatically compensates thermocouple measurements.

Bus Sizing Parameters• Current Consumption: 15 mA, nominal• Minimum Voltage: 9 V dc• Virtual Communication Relationships: 20 VCR

Input Types and Range LimitsRefer to Table 1.

Span Limits5°C (10°F) minimum; see Table 1 for maximum

Engineering UnitsThe transmitter electronic database can be configured for ohms, millivolts, milliamps, °Fahrenheit, °Celsius, Kelvin, or Dewpoint.

Two-Wire TransmitterThe same two wires are used for input power, output signal, and remote communication.

Field WiringThe transmitter FOUNDATION fieldbus wiring termination is polarity independent; therefore the device cannot be wired incorrectly.

Isolation500 V ac, rms

Influence

Reference Operating Conditions

OperativeLimits(a)

Storage andTransportation Limits

Ambient TemperatureWithout Integral DisplayWith Integral Display

24 ±2°C (75 ±3°F)24 ±2°C (75 ±3°F)

-40 to +85°C (-40 to +185°F)-29 to +70°C (-20 to +158°F)

-54 to +85°C (-65 to +185°F)-54 to +85°C (-65 to +185°F)

Relative Humidity 50 ±10% 0 to 95% (noncondensing) 0 to 95% (noncondensing)Supply Voltage (by Fieldbus) 24 ±0.5 V dc 9 to 32 V dc Not ApplicableVibration Negligible 19 mm (0.75 in)

Double Amplitudefrom 5 to 9 Hz

0 to 30 m/s2 (0 to 3 “g”)(b)from 9 to 500 Hz

107 mm (42 in) Drop in Shipping Container

(1) Performance stated under reference operating conditions with power supply filter set to standard, damping set to none, noise filtering and intelligent smoothing time set to 10 s. Accuracies stated include linearity, hysteresis, and repeatability.

PSS 2A-1F4 CPage 7

(a) Digital accuracy is either the listed value or ±0.01% of span, whichever is greater. For thermocouples only, add the applicable cold junction error, ±0.2°C (±0.5°F), to the digital accuracy.

(b) DIN/IEC 751; alpha = 0.00385 (1984) ASTM-B Standard Accuracy.(c) DIN/IEC 751; alpha = 0.00385 (1984) ASTM-A High Accuracy(d) SAMA Standard RC 21-4; alpha = 0.003923.(e) Foxboro NR 226/227. Refer to TI 005-24a.(f) DIN 43760.(g) Foxboro CR 228/229. Refer to TI 005-25a.(h) NIST Monogram 125, DIN IEC 584.(j) DIN 43710 (1985).(k) Does not include sensor accuracy.(l) May exhibit a decrease in performance at temperatures below 43°C (109°F).

Input Response TimeWith minimum damping, the 90% response time for an 80% input step is 1.2 seconds.

Electronic DampingDamping is configurable to settings of 0.0 (none), 0.25, 0.50, 1, 2, 4, 8, 16, and 32 seconds.

Intelligent Noise FilteringThe Intelligent Noise Filtering algorithm eliminates noise while still maintaining fast response to rapid input changes.

Supply Voltage9 to 32 V dc, by a specially designed fieldbus power source connected to the bus. For intrinsically safe (I.S.) applications, the supply voltage allowed can vary depending on the rating of the I.S. barrier.

Host/Transmitter CommunicationYou may monitor, configure, and/or calibrate your transmitter using the following:• The Optional LCD Indicator with On-Board

Pushbuttons (not for calibration)• I/A Series System with fieldbus support• Any other FOUNDATION Fieldbus Certified Host

Table 1. Range Limits, Maximum Span, and Accuracy

Input TypeModel Code

See Note

Range Limits Maximum Span Digital Accuracy(a,k)

°C °F °C °F °C °F

RTD (2, 3, or 4 wire)

Pt100 DIN/IEC Q b -200 and +850 -328 and +1562 1050 1890 ±0.05 ±0.09Pt100 DIN/IEC A c -200 and +850 -328 and +1562 1050 1890 ±0.05 ±0.09Pt100 SAMA P d -200 and +650 -328 and +1202 850 1530 ±0.05 ±0.09Ni 200 D e -130 and +315 -202 and + 599 445 801 ±0.44 ±0.79Ni 120, Minco G -80 and +320 -112 and + 608 400 720 ±0.03 ±0.05Ni 100 I f -60 and +250 -76 and +482 310 558 ±0.04 ±0.07Cu 10 F g -70 and +150 -94 and +302 220 396 ±0.51 ±0.92

Thermocouple

Type B B h,l 0 and +1820 +32 and +3308 1820 3276 ±0.51 ±0.92Type C C h 0 and +2320 +32 and +4208 2320 4176 ±0.38 ±0.68Type E E h -270 and +1000 -454 and +1832 1270 2286 ±0.08 ±0.14Type J J h -210 and +1200 -346 and +2129 1410 2538 ±0.11 ±0.20Type K K h -270 and +1372 -454 and +2502 1642 2956 ±0.14 ±0.25Type L L j -200 and +900 -328 and +1652 1100 1980 ±0.13 ±0.23Type N N h -270 and +1300 -454 and +2372 1570 2862 ±0.15 ±0.27Type R R h -50 and +1768 -58 and +3214 1818 3272 ±0.42 ±0.76Type S S h -50 and +1768 -58 and +3214 1818 3272 ±0.49 ±0.88Type T T h -270 and +400 -454 and +752 670 1206 ±0.10 ±0.18Type U U j -200 and +600 -328 and -1112 800 1440 ±0.09 ±0.16

Other

Millivolt M – -15 and +115 mV dc 130 mV dc ±6 µVResistance O – 1 and 500 Ω 500 Ω ±20 mΩMilliamp H 0 to 25 mA 25 mA 0.03 mACustom Z 2- to 22-point user-configurable curve

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FUNCTIONAL SPECIFICATIONS (Cont.)

Configurable ParametersThe following are some of the parameters that can be configured using FOUNDATION Fieldbus protocol:DESCRIPTORS• Resource State• Message

OUTPUT• Engineering Units (EGU)(1)

• Percent (%)• Linearization Mode

INPUT• Input Type (Refer to Table 1)(1)

• Lower Range Value (LRV)(1)

• Upper Range Value (URV)(1)

• Cold Junction• Cold Junction EGU

OTHER• Sensor Fault Detection (On/Off)(1)

• Power Supply Frequency (50/60 Hz)• Damping• Intelligent Smoothing Time• Resource Diagnostic Parameters• Calibration and Date of Last Calibration• Calibrator's Name• FOUNDATION Fieldbus Parameters(2)

Tagging – Hardware and SoftwareThe permanently attached stainless steel data plate and the transmitter electronic tag number is factory configured at no charge using the customer supplied tagging information.

Installation Characteristics

(a) Device quantity may be less; depends on power consumed, type of cable used, and accessory devices added.

(b) Maximum cable length (control bus plus spurs) is based on use of #18 AWG (0.8 mm2) shielded twisted pair cable. See Installation Manual for the precise relationship between cable length, spur lengths, cable type, and number of devices.

(c) Minimum spur length is 1 m (3.3 ft).

Installation TopologiesFigure 5 shows a typical fieldbus installation. Note the locations of the fieldbus terminators, intrinsically safe (I.S.) barrier, and I.S. and non-I.S. devices. Other typical installation topologies are shown in Figure 6, including a bus with spurs, a daisy chain, and a tree. Figure 7 shows a mixed topology installation where a bus with spurs, daisy chain, and tree are connected in series.

Figure 5. Typical FOUNDATION Fieldbus Wiring Diagram with Bus Topology

(1) Also accessible with Optional LCD Indicator/Configurator.(2) Not configurable via Optional LCD Indicator/Configurator.

Parameter SpecificationIntrinsically Safe NoMaximum No. of Devices(a) 32Maximum Cable Length(b) 1900 m (6234 ft)Maximum Spur Length(b)(c) 120 m (394 ft)

FIELDBUS DEVICES(NOT INTRINSICALLY SAFE)

INTRINSICALLYSAFE BARRIER

INTRINSICALLY SAFEFIELDBUS DEVICES

FIELDBUSTERMINATOR

FIELDBUSPOWER SUPPLY

FIELDBUS HOST

NONHAZARDOUS AREA LOCATIONS HAZARDOUS AREA LOCATIONS

I.S. FIELDBUSTERMINATOR (ONLYREQUIRED WHENI.S. BARRIER ISISOLATION TYPE)

INTRINSICALYSAFE (I.S.)FIELDBUSTERMINATOR

I.S. FIELDBUSTERMINATOR (ONLYREQUIRED WHENI.S. BARRIER ISISOLATION TYPE)

PSS 2A-1F4 CPage 9

Figure 6. Miscellaneous Installation Topologies Figure 7. Installation with Mixed Topologies

PHYSICAL SPECIFICATIONS

Basic Transmitter (Package Code B)(1)

Enclosed in polycarbonate material

Enclosure ConstructionHOUSING (Package Codes S, W, L):

Epoxy-coated, low-copper aluminumHOUSING (Package Codes T, Y, M):

316 ss (CF-8M/UNS-J92900)HOUSING COVER O-RING

UV Stabilized Buna-N

Union Coupling for Thermowell Mount• Zinc-Plated Steel for Foxboro Code L housing,

or with user-supplied thermowell option -D5 (Codes L or M housing). See Model Code.

• Stainless Steel for Foxboro Code M housing, or with Option -H2. See Model Code.

Environmental ProtectionHousing: NEMA 4X, IP66

Mounting Options

(a) For mounting transmitter to surface, or DN50 or 2-in pipe. Package Configuration Codes “S” or “T” only.

(b) Hardware provided to allow mounting of Basic Transmitter Package Code “B” to DIN rail provided by user. Transmitter must be mounted in EMI-Shielded enclosure provided by user.

Approximate Transmitter MassBASIC

0.13 kg (0.28 lb)SURFACE MOUNT (ALUMINUM)

1.47 kg (3.25 lb)SURFACE MOUNT (316 SS)

3.25 kg (7.25 lb)WITH 3-LINE INDICATOR

Add 0.06 kg (0.13 lb)

FIELDBUSINTERFACE

JUNCTION BOX

BUS WITH SPURS DAISY CHAIN TREE

HOSTCOMPUTER

NOTETerminators and Power Supply not shown

FIELDBUSINTERFACE TERMINATE AT

JUNCTION BOX

BUS WITH SPURS DAISY CHAIN TREE

HOSTCOMPUTER

NOTETerminators and Power Supply not shown

(1) Basic Transmitter Package must be mounted in EMI-Shielded enclosures provided by user.

Option Code Bracket Hardware

MountingSet(a)

-M1 Epoxy-Coated Steel Plated Steel-M2 Stainless Steel Stainless Steel

DIN2 Rai(b)

-D1 Aluminum and Plastic Plated Steel

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ELECTRICAL SAFETY SPECIFICATIONS

NOTEThe RTT25 Transmitter has been designed to meet the Electrical Safety descriptions listed above. For detailed information, or status of testing laboratory approvals or certification, contact Invensys Foxboro.

Testing Laboratory, Type of Protection, and Area Classification Application Conditions

Electrical Safety

Design Code

ATEX flameproof, Zone 1, II 2 G, EEx d, IIC; hazardous locations.

With Package Configurations S and T only.Temperature Class T6.

ED

CSA explosionproof, Class I, Division 1, Groups B, C, and D; dust-ignitionproof, Class II, Division 1, Groups E, F, and G; Class III, Division 1; and Class I, Division 2, Groups A, B, C, and D; hazardous locations.

With Package Configurations L, M, S, and T only. Temperature Class T6 at 40°C (104°F) and T5 at 85°C (185°F) maximum ambients.

CDSee Note (a)

FM explosionproof, Class I, Division 1, Groups B, C, and D; dust-ignitionproof, Class II, Division 1, Groups E, F, and G; Class III, Division 1; and Class I, Division 2, Groups A, B, C, D, F, and G; hazardous locations.

With Package Configurations L, M, S, and T only. Temperature Class T6 at 40°C (104°F) and T5 at 85°C (185°F) maximum ambients.

FDSee Note (a)

(a) FM approval and CSA certification of the Model RTT25 for the explosionproof rating listed included pressure piling tests with various lengths of conduit to ensure that conduit seals per NEC 501-5(a)1 within 475 mm (18 inches) of the housing are NOT required.

PSS 2A-1F4 CPage 11

(a) Material Certificate (AS Reference CERT-C) is not applicable to the basic transmitter.

MODEL CODES

Model Code – Basic Transmitter Unit for DIN Rail Mount, Panel Mount, or Replacement; No SensorDescription ModelIntelligent Temperature Transmitter RTT25

Output Signal and Communication ProtocolDigital, FOUNDATION fieldbus –F

Input ConfigurationSingle Input (one sensor) 1Dual Independent Input Channels (two sensors) 2Dual Input Channels – Configured for Redundant (two sensors) 3Dual Input Channels – Configured for Average (two sensors) 4Dual Input Channels – Configured for Difference (two sensors) 5

Package Configuration (see Figure 1)Basic Transmitter Unit (No Housing) – Used for DIN Rail Mount, Panel Mount, or Replacement (a) B

Sensor LengthNone (Not Applicable) N

Measurement Input Type (Software Selectable)None – Specified Factory Default to Code Q XThermocouple, Type B BThermocouple, Type C CThermocouple, Type E EThermocouple, Type J JThermocouple, Type K KThermocouple, Type L LThermocouple, Type N NThermocouple, Type R RThermocouple, Type S SThermocouple, Type T TThermocouple, Type U U

RTD, Platinum, 100 Ω, DIN/IEC 751 (ASTM-B Standard Accuracy) QRTD, Platinum, 100 Ω, DIN/IEC 751 (ASTM-A High Accuracy) ARTD, Platinum, 100 Ω, SAMA PRTD, Nickel, 200 Ω, (NR-226/227) DRTD, Nickel, 120 Ω, Minco GRTD, Nickel, 100 Ω, DIN 43760 IRTD, Copper 10 Ω F

Milliamp Input (4 to 20 mA nominal, 0 to 25 mA maximum) HMillivolt Input MOhms Input OCustom Input (up to 22 points) Z

Electrical SafetyNo Approvals or Certifications ZZ

Optional SelectionsRefer to “Optional Selection” Codes section further in document

PSS 2A-1F4 CPage 12

(a) Material Certification (AS Reference CERT-C) not applicable.

MODEL CODES (Cont.)Model Code – Surface or Pipe Mount Transmitter, No Sensor

Description ModelIntelligent Temperature Transmitter RTT25

Output Signal and Communication ProtocolDigital, FOUNDATION fieldbus –F

Input ConfigurationSingle Input (one sensor) 1Dual Independent Input Channels (two sensors) 2Dual Input Channels – Configured for Redundant (two sensors) 3Dual Input Channels – Configured for Average (two sensors) 4Dual Input Channels – Configured for Difference (two sensors) 5

Package Configuration and Housing Material (see Figure 1) Surface or Pipe Mount, Epoxy Coated Aluminum Housing with 1/2 NPT Conduit Threads S

Explosionproof Housing; no sensor (a)Surface or Pipe Mount, Stainless Steel Housing with 1/2 NPT Conduit Threads T

Explosionproof Housing; no sensor (a)

Sensor LengthNone (Not Applicable) N

Measurement Input Type (Software Selectable)None – Specified Factory Default to Code Q XThermocouple, Type B BThermocouple, Type C CThermocouple, Type E EThermocouple, Type J JThermocouple, Type K KThermocouple, Type L LThermocouple, Type N NThermocouple, Type R RThermocouple, Type S SThermocouple, Type T TThermocouple, Type U U

RTD, Platinum, 100 Ω, DIN/IEC 751 (ASTM-B Standard Accuracy) QRTD, Platinum, 100 Ω, DIN/IEC 751 (ASTM-A High Accuracy) ARTD, Platinum, 100 Ω, SAMA PRTD, Nickel, 200 Ω, (NR-226/227) DRTD, Nickel, 120 Ω, Minco GRTD, Nickel, 100 Ω, DIN 43760 IRTD, Copper 10 Ω F

Milliamp Input (4 to 20 mA nominal, 0 to 25 mA maximum) HMillivolt Input MOhms Input OCustom Input (up to 22 points) Z

Electrical SafetyATEX, Flameproof, Zone 1, II 2 GD, EEx d IIC EDCSA, Explosionproof CDFM, Explosionproof FDNo Approvals or Certifications ZZ

Optional SelectionsRefer to “Optional Selection” Codes section further in document

PSS 2A-1F4 CPage 13

(a) RTD lengths less than 3.5 in (89 mm) will need insulation to avoid measurement error due to heat radiation.

MODEL CODES (Cont.)Model Code – Transmitter with Integrally Mounted Bare Sensor

Description ModelIntelligent Temperature Transmitter RTT25

Output Signal and Communication ProtocolDigital, FOUNDATION fieldbus –F

Input ConfigurationSingle Input (one sensor) 1

Package Configuration and Housing Material (see Figure 1)Epoxy Coated Aluminum Housing with 1/2 NPT Conduit Threads (explosionproof)

with Integrally Mounted Bare Sensor W

Stainless Steel Housing with 1/2 NPT Conduit Threads (explosionproof)with Integrally Mounted Bare Sensor

Y

Sensor Length (U + T Length) - See CAUTION below2 in (50 mm) (a) A2.5 in (64 mm) (a) B3 in (76 mm) (a) C3.5 in (89 mm) D4 in (102 mm) E4.5 in (114 mm) F5 in (127 mm) G5.5 in (140 mm) H

6 in (152 mm) J7 in (178 mm) K8 in (203 mm) L9 in (229 mm) M10 in (254 mm) P

11 in (279 mm) Q12 in (305 mm) R18 in (457 mm) S24 in (610 mm) T30 in (762 mm) U36 in (914 mm) VCustom Length per Sales Order – up to 120 in (up to 3 m) maximum X

Measurement Input Type (Software Selectable)Thermocouple, Type E EThermocouple, Type J JThermocouple, Type K KThermocouple, Type T T

RTD, 100 Ω, Platinum, DIN/IEC 751 (ASTM-B Standard Accuracy) QRTD, 100 Ω, Platinum, DIN/IEC 751 (ASTM-A High Accuracy) ARTD, 100 Ω, Platinum, SAMA P

Electrical SafetyNo Approvals or Certifications ZZ

Optional SelectionsRefer to “Optional Selection” Codes section further in document

PSS 2A-1F4 CPage 14

(a) Option -H2 is optional with Package Configuration Code L, but standard construction with Package Configuration Code M.(b) RTD lengths less than 3.5 in (89 mm) will need insulation to avoid measurement error due to heat radiation.

! CAUTIONSensor length (U + T) must equal the thermowell U + T length. For example, if a 6 in (152 mm) long sensor is selected, the thermowell must also have a U + T length of 6 in (152 mm)

MODEL CODES (Cont.)Model Code – Transmitter with Integrally Mounted Sensor for Thermowell Mount

Description ModelIntelligent Temperature Transmitter RTT25

Output SignalDigital, FOUNDATION fieldbus –F

Input ConfigurationSingle Input (one sensor) 1

Package Configuration and Housing Material (see Figure 1) (a)Epoxy Coated Aluminum Housing with 1/2 NPT Conduit Thread (explosionproof)

With Integrally Mounted Sensor for Thermowell MountL

Stainless Steel Housing with 1/2 NPT Conduit Thread (explosionproof)With Integrally Mounted Sensor for Thermowell Mount

M

Sensor Length (U + T Length) - See CAUTION below2 in (50 mm) (b) A2.5 in (64 mm) (b) B3 in (76 mm) (b) C3.5 in (89 mm) D4 in (102 mm) E4.5 in (114 mm) F5 in (127 mm) G5.5 in (140 mm) H6 in (152 mm) J7 in (178 mm) K

8 in (203 mm) L9 in (229 mm) M10 in (254 mm) P11 in (279 mm) Q12 in (305 mm) R18 in (457 mm) S24 in (610 mm) T30 in (762 mm) U36 in (914 mm) VCustom Length per Sales Order – 120 in (3 m) maximum X

Input Measurement Type (Software Selectable)Thermocouple, Type E EThermocouple, Type J JThermocouple, Type K KThermocouple, Type T TRTD, 100 Ω, Platinum, DIN/IEC 751 (ASTM-B Standard Accuracy) QRTD, 100 Ω, Platinum, DIN/IEC 751 (ASTM-A High Accuracy) ARTD, 100 Ω, Platinum, SAMA P

Electrical SafetyCSA, Explosionproof (Must also select Option -D2 Thermowell Attached) CDFM, Explosionproof (Must also select Option -D2, Thermowell Attached) FDNo Approvals or Certifications (Not available with Option -D2, Thermowell Attached) ZZ

Optional SelectionsRefer to “Optional Selection” Codes on next page

PSS 2A-1F4 CPage 15

(a) Custody Transfer Lock and Seal is standard construction with Electrical Safety Code ED.(b) Hardware only; DIN rail is provided by user.(c) Required selection with Electrical Safety Codes CD or FD when Package Code L or M is used. Also, not available with Electrical

Safety Code ZZ.(d) This option provides for mounting an RTT25 Basic Transmitter into an RTT20 Transmitter enclosure.(e) Union coupling Option -H2 is standard construction with Package Configuration Code M.(f) Mounting set for mounting Package Configuration Codes S and T to a surface, or DN 50 or 2-in pipe.(g) This stainless steel tag is attached to the transmitter with wire. It provides 1.5 x 3.5 in (40 x 90 mm) of surface area for the user to

add further tag data.

NOTE

For further information relating to options, accessories, and services availablewith the RTT25 Temperature Transmitter, refer to PSS 2A-1Z9 F.

MODEL CODES (Cont.)

Optional Selection Codes

Option Description

Used with Package Configuration Code: Option CodeB S T W Y L M

Custody Transfer Lock and Seal (a) – Yes Yes Yes Yes Yes Yes -A1Custom Database Configuration Yes Yes Yes Yes Yes Yes Yes -C2DIN Rail Mounting (b) Yes – – – – – – -D1Ship with Thermowell Attached (c) – – – – – Yes Yes -D2Adapter Plate for Replacement of RTT20 Transmitter(f) Yes – – – – – – -D3Stainless Steel Union Coupling (e) – – – – – Yes (e) -H2Temperature Operative Limits Extended to -50°C (-58°F) Yes Yes Yes Yes Yes Yes Yes -JDelete Instruction Book Yes Yes Yes Yes Yes Yes Yes -K1Three-Line LCD Indicator and Configurator Yes Yes Yes Yes Yes Yes Yes -L3Mounting Set, Epoxy-Coated Steel (f) – Yes Yes – – – – -M1Mounting Set, 316 ss(j) – Yes Yes – – – – -M2Supplemental Customer Tag (g) Yes Yes Yes Yes Yes Yes Yes -T

Example: RTT25-F3SNQFD-L3M1

PSS 2A-1F4 CPage 16

SUGGESTED RFQ SPECIFICATIONS

The manufacturer shall provide a microprocessor-based temperature transmitter with FOUNDATION fieldbus digital output which is linear to the measured temperature as follows:

ALTERNATE SUGGESTED RFQ SPECIFICATIONS

The vendor shall furnish the following instrument for sensing temperature (single or dual sensors) and transmitting a Foundation fieldbus digital output signal. The instrument shall measure a temperature of ____ to ____°C using a thermocouple or RTD. The transmitter shall be microprocessor-based with automatic self-calibration to virtually eliminate drift and ambient temperature errors. All diagnostic messages must be automatic and transmitted to a local display or remote configurators.

The transmitter housing should be suitable for integral or remote mounting of the sensor and shall be approved for use in hazardous locations (intrinsically safe and/or explosionproof). The basic transmitter shall be sealed and protected against moisture and other contaminants. The transmitter shall be a Foxboro I/A Series Temperature Transmitter, Model RTT25, or approved equivalent.

Electronics: Sealed Against Moisture

Sensors: All Popular RTDs, Thermocouples, mV, mA, and ohms

Input Configuration: Single or Dual Sensors

Self-Calibration: Automatic with No Prompt Required

Enclosure: Suitable for Remote or Integral Sensor Mounting (NEMA 4X and IP66)

Configurators: Integral and Remote Required

LCD Indicator: Must Display Faults and Tag Number, and have Configuration Pushbuttons

Accuracy: 0.1°C for a 100 Ω Pt RTD at 0 to 100°C Span

Model Code: Foxboro Model RTT25, or Equivalent

PSS 2A-1F4 CPage 17

DIMENSIONS – NOMINAL

mmin

BASIC UNIT - PACKAGE CONFIGURATION CODE B

220.9

DIN RAIL(BY USER)

FOUR SENSOR TERMINAL;TWO PLACESFOR DUAL MEASUREMENT

712.8

DIA.TWO MOUNTING HOLES, ON 71 mm (2.8 in) DIAMETERBOLT CIRCLE.

OUTPUTTERMINALS

SHOWN WITHOUT LCDINDICATOR/CONFIGURATOR

532.1

411.6

SHOWNWITH OPTIONAL LCD INDICATOR/CONFIGURATOR

DIN RAILMOUNTINGHARDWAREOPTION -D1

532.1

411.6

SURFACE OR PIPE MOUNT TRANSMITTER WITH REMOTE SENSOR (PACKAGE CODE S OR T)

®

X

281.1

1094.3

1194.7

1/2 NPT, TWO PLACESPG13.5 OPTIONAL

NOTE 2

DN 50 OR 2 inPIPE SUPPLIEDBY USER

1. ALLOW 51 mm (2 in) CLEARANCE FOR COVER REMOVAL.2. EXTERNAL COVER LOCK AND GROUND SCREW LOCATION FOR ELECTRICAL CODES EA, ED, AND KN, OR OPTIONAL FEATURE -A1.

NOTES

DIMENSION X (NOTE 1)

WITHOUTINDICATOR

WITHINDICATOR

873.4

873.4

HOUSINGMATERIAL

ALUMINUM

993.91124.4

316 ss

712.8

U-BOLT

PIPE OR SURFACEMOUNTING BRACKET

MOUNTINGSET OPTIONS-M1 OR -M2FOR PIPE ORSURFACE MOUNTING.(U-BOLT NOT REQUIREDFOR SURFACE MOUNTING.)

TRANSMITTER WITH INTEGRAL SENSOR (PACKAGE CODE L, M, W, OR Y)

®

351.38

A

A +

1/2 NPTBARE SENSOR

A = ELEMENT INSERTION LENGTHU = THERMOWELL INSERTION LENGTHT = THERMOWELL LAGGING LENGTH

NOTE:

1154.5

U

U +

251.0

251.0

1154.5

U

U + T +

251.0

251.0

T

SENSOR ANDTHERMOWELL

SENSOR AND THERMOWELLWITH LAGGING

PSS 2A-1F4 CPage 18

PSS 2A-1F4 CPage 19

PSS 2A-1F4 CPage 20

ORDERING INSTRUCTIONS

OTHER M&I PRODUCTS

1.2.3.

4.5.

Model CodeCalibrated RangeThermowell Part Number or Model, if required(Refer to PSS 3-3C1 A and PSS 3-3D1 A for W Series and T Series Thermowells, respectively.)Remote Configurator, if requiredCustomer Tag Data

Invensys Foxboro provides a broad range of measurement and instrument products, including solutions for pressure, flow, analytical, positioners, temperature, controlling and recording. For a listing of these offerings, visit the Invensys Foxboro web site at:

www.foxboro.com/instrumentation

33 Commercial StreetFoxboro, MA 02035-2099United States of America

www.foxboro.comInside U.S.: 1-866-746-6477Outside U.S.: 1-508-549-2424 or contact your local Foxboro representative.Facsimile: 1-508-549-4999

Invensys, Foxboro, FoxCom, and I/A Series are trademarks of Invensys plc, its subsidiaries, and affiliates.All other brand names may be trademarks of their respective owners.

Copyright 2000-2005 Invensys Systems, Inc.All rights reserved

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