INTERNATIONAL

SENSOR TECHNOLOGY

IRVINE, CALIFORNIA

PRODUCT CATALOG

TOXIC & COMBUSTIBLE GAS MONITORS FOR

AREA AIR QUALITY AND SAFETY APPLICATIONS

UTILIZING THE FOLLOWING SENSORS:

ISTS PATENTED SOLID STATE

INFRARED (IR)

PHOTOIONIZATION DETECTOR (PID)

ELECTROCHEMICAL

CATALYTIC BEAD

Located in Irvine, California, International SensorTechnology (IST) manufactures both the sensors and theinstrumentation used to detect over 150 different toxicand combustible gases for area air quality and safety ap-plications. Since 1972, IST instruments have served alarge and diverse customer base, with users including re-fineries, chemical plants, semiconductor facilities,hospitals, food and beverage companies, and many oth-ers. In fact, our equipment was even chosen by NASA foruse in the Space Shuttle program.

IST offers a complete line of instrumentation, includingportables, single and multi-point stationary instruments,stand-alone sensor transmitters, and computerized gasmonitoring systems. Besides offering a complete line ofinstrumentation, IST also offers the most comprehensivechoice of sensor technologies available today, including:

ISTs patented Solid-State Sensor Infrared Sensor (IR)* Catalytic Bead Sensor Electrochemical Sensor Photoionization Detector

With this vast array of sensor and instrumentationchoices, IST has the right solution for your gas monitor-ing application.

*Patent Pending

STATIONARYINSTRUMENTS

SENSOR TRANSMITTERS

INTELLIGENT TRANSMITTERMODEL 4-20IQ

The Model 4-20IQ is a microprocessor based, intelligentsensor transmitter which features a digital display of thegas concentration. Operating on 14-24 VDC power, it alsoprovides a linear 4-20 mA output and, like the SM95, ishoused in an explosion proof casing rated for Class 1, Div.1, Groups B,C,D (UL & CSA approved). It can operate asa stand-alone instrument or can be used with any ISTcontroller, which display the readings and provide alarmrelays.

The 4-20IQ comes equipped with a non-intrusive auto-mated calibration feature which allows the unit to becalibrated without adjusting any potentiometers. Simplyapply calibration gas and the 4-20IQ will automaticallymake the necessary calibration adjustments. Operatingthe 4-20IQ is accomplished by using a magnetic wand to activate magnetic switches located on the front panel.Thus, all functions can be performed without removingany covers, meaning there is no need to declassify areas being monitored. Like the SM95, the 4-20IQ can be equipped with Solid State, Catalytic Bead,Electrochemical, or Infrared sensors.

STANDARD TRANSMITTERMODEL SM95

The Model SM95 sensor transmitter is housed in an ex-plosion-proof casing rated for Class 1, Div. 1, GroupsB,C,D (UL & CSA approved). It operates on 14-24 VDCpower and provides a linear 4-20 mA output proportion-al to the gas concentration. The SM95 can operate as astand-alone instrument or can be used in conjunctionwith any of ISTs complete line of control units which dis-play the readings and provide alarm relays. When usedwith any of ISTs MP Series of control units, automatedcalibration is provided, enabling calibration without theneed to adjust potentiometers. The SM95 can beequipped with Solid State, Electrochemical, CatalyticBead, or Infrared sensors.

SINGLE CHANNEL WALL MOUNTEDMODEL LC100

The LC100 is a single channel, wall mounted controlunit which is housed in a weatherproof enclosure. It pro-vides a digital display of the gas concentration, 2 alarmrelays and a fault relay with corresponding LEDs, and abuilt-in alarm buzzer. Either an SM95 or 4-20IQ transmit-ter can be connected externally to the unit or, as anoption, a Solid State sensor can be internally mounted di-rectly inside the LC100 housing (this option requiressample to be pumped to the unit). A 4-20 mA output isavailable as an option.

MULTI-CHANNEL WALL MOUNTEDMODEL MP202/MP204

The MP202 and MP204 are wall-mounted control unitshoused in weatherproof enclosures. The MP202 is a twochannel controller which can be used for 1 or 2 sensorchannels, while the MP204 is a four channel controllerwhich can be used for up to 4 sensor channels.

These microprocessor based controllers feature a digi-tal display of gas concentration for each sensor channeland a front door keypad which enables convenient oper-ation without opening the enclosure. Low, mid, and highalarm relays as well as a fault relay (with correspondingLEDs) are also provided to trigger alarm devices such aslights and horns. Optional 4-20 mA outputs are available.

The MP Series units feature automated calibrationwhich enables the sensor transmitters to be calibratedwithout removing the cover or adjusting potentiometers.Simply apply gas to the sensor and the control unit willmake all the necessary adjustments. It couldnt be easier!

MULTI-CHANNEL RACK MOUNTEDMODEL MP24

The MP24 is a rack/panel mounted version of theMP202. It is a compact control unit which accepts 1 or 2sensor channels. Because of its compact design, up to 12of these control units will fit side by side into a 19" rack orpanel space, for a total of 24 sensor channels. The MP24also has a modular design which allows for easy expan-sion and the ability to configure the unit specifically for aparticular application. Like the MP202/MP204, the MP24can be equipped with optional 4-20 mA outputs.

DUAL CHANNEL EXPLOSION PROOFMODEL MP220EX

The MP220EX is a two-channel, explosion proof, wallmounted, control unit rated for use in Class 1, Div. 1,Groups C, & D (B optional) hazardous areas. Operationvia magnetic wand allows the unit to be operated with-out opening the cover, thereby ensuring that hazardousareas do not require declassification. 4-20 mA outputs areavailable as an option.

STATIONARYINSTRUMENTS

CONTROLLERS

WALL MOUNTEDMODEL LC100

WALL MOUNTEDMODEL MP202

WALL MOUNTEDMODEL MP204

RACK/PANEL MOUNTEDMODEL MP24

EXPLOSION PROOFMODEL MP220EX

FOR GAS CABINETS SINGLE CHANNEL RACK MOUNTED MODEL MP100

The MP100 is a single channel rack mounted controllerdesigned for installation into semiconductor gas cabi-nets for detection of Hydrogen. Utilizing a long life SolidState sensor, it can be configured to detect hydrogen ineither PPM or %LEL concentrations. The Solid State sen-sor offers a 10+ year life expectancy and comes with a 3year warranty, thus offering significant improvementsover electrochemical sensors which have commonlybeen used in these applications. The unit comes stan-dard with a digital display, 2 alarm relays and a 4-20 mAoutput. Like the other MP Series controllers, the MP100also features automated calibration. It operates on 24VDC, and can optionally be configured to operate on 110or 220 VAC.

PORTABLESCOMPUTERIZEDSYSTEMS

REMOTE-LINK SYSTEMThe Remote-Link System is a state-of-the-art, comput-

er-controlled gas monitoring system which allowssensors to communicate with the Remote-Link Computerover an AC power line, providing a data highway whicheliminates the individual sensor wiring associated withconventional monitoring systems. Since 1989, theRemote-Link System has provided customers worldwidewith the most advanced monitoring system available,with the capabilities, features, and field proven reliabilityfound on no other system. The Remote-Links powerfulmonitoring software includes such features as dataarchiving and reporting, curve plotting, alarm process-ing, and fault monitoring. Additionally, computergraphics display your plant and the locations of all sen-sors within your plant. By using the mouse button topoint and click on a sensor, you can view its currentreading and alarm status. A separate readings screen letsyou view the readings of all sensors simultaneously.When an alarm occurs, audible and visual indications areprovided and the graphics display will pinpoint thealarm area. In addition, programmable alarm relays areactivated to trip horns, lights, etc.

The Remote-Link Systemcan accommodate hun-dreds, even thousands, ofsensors, yet is still an eco-nomical choice for systemswith as few as 8 sensors.The modular design of thesystem enables additionalsensors to be added withease at a low incrementalcost, allowing you to ex-pand the system accordingto your needs. Computerassisted calibration takesthe hassle out of calibra-tion. Zero every sensor inthe system with the pressof a button! Then, simplyapply gas to each sensorand the let the computer dothe rest. Calibration justdoesnt get any easier!

All of ISTs portable instruments are designed to oper-ate on either alkaline or nicad batteries, or the ACadapter/charger which is included with every unit. TheAC adapter/charger will charge nicad batteries, whilebypassing alkaline batteries, and allows portable units tobe powered on at all times and ready for use for maxi-mum reliability.

TLV PANTHERThe TLV Panther is an Industrial Precision

Photoionization Detector (PID). Offering fast responseand high sensitivity, photoionization is the preferredmethod for detection of Volatile Organic Compounds(VOCs), and the TLV Panther is the first PID unit of itskind to utilize Precise Response Curves for the detectionof individual gases, including ammonia, benzene, andhydrazine, to name a few. No correction factors are used.The actual response curves for 30 gases are prepro-grammed into each unit. The TLV Panthers automatedcalibration feature allows you to calibrate all of thesegases by calibrating just one gas, making calibration ex-tremely simple. For maximum precision, you also havethe option to individually calibrate gases of interest.

The TLV Panther also provides you with the ability ofadding up to 3 additional sensors, either electrochemicalor infrared, for more selective detection of individualgases of interest. This allows the TLV Panther to handle awide variety of applications. The TLV Panther also comesstandard with a large, backlit LCD display, built-in sam-pling pump, and audible and visual alarms. The optionaldata logging feature lets you store months worth of datawhich can be downloaded to a computer or printed outvia the built-in RS-232 interface. The unit is powered via6 D size batteries (alkaline or nicad), or the ACadapter/charger.

TLV FALCONLike the TLV Panther, the TLV Falcon incorporates a

photoionization detector (PID) for the detection ofVolatile Organic Compounds (VOCs). However, becausethe TLV Falcon is a single channel unit, it is much morecompact. The TLV Falcon comes standard with a digital

display, built-in sample pump, and audible and visualalarms. It operates on 4 C size alkaline or nicad cadmi-um batteries, or the AC adapter/charger. The unit comesstandard with 3 ranges which are selectable via a switchon the front panel. While the unit comes standard calibrated to isobutylene, calibration to other gases is also available.

concentration, built-in sample pump, and audible andvisual alarms. It operates on 4 C size alkaline or nicad bat-teries, or the AC adapter/charger. The Eagle comesstandard with 3 ranges which are selectable via a switch onthe front panel.

100 GAS PORTABLE MODEL IQ-1000 ISTs Model IQ-1000 is the most unique and versatile

portable gas detector on the market today. Using ISTsMega-Gas sensor, this remarkable unit can detect OVER100 toxic and combustible gases. Three alarm setpointsare provided for each gas, and audible as well as visualindicators alert you if any of these alarm limits have beenexceeded. A Gas Search feature allows you to scan anarea for any of these hazardous gases.

Besides the Mega-Gas sensor, the IQ-1000 also acceptselectrochemical, catalytic bead, solid state, or infraredsensors. A total of four sensors of varying types can beused, giving the IQ-1000 the flexibility to meet a widerange of applications. A large, 8 line, 40 character per linedisplay allows you to simultaneously view the readingsof all 4 sensors.

The standard unit includes a built-in sample pump,sample wand, and carrying case. Calibration is simpleand automated, and optional datalogging enables storageof months of data. An RS-232 port provides interface to acomputer or printer. Power is provided by six D size al-kaline or nicad batteries, or the AC adapter/charger. TheIQ 1000 weighs approximately 6 lbs., including batteries.

IQ-350 EAGLEThe IQ-350 Eagle is a portable instrument which comes

equipped with an Infrared (IR) sensor for detection ofCarbon Dioxide (CO2), Carbon Monoxide (CO), orHydrocarbons (HCs). The unit can be optionallyequipped with an additional sensor for the detection ofOxygen. The unit provides a digital display of gas

SINGLE GAS PORTABLEMODEL IQ-250

ISTs Model IQ-250 is a single gas portable instrumentwhich can be equipped with either a solid state, or elec-trochemical sensor. Any one of over 150 toxic andcombustible gases can be chosen. A digital display indi-cates the gas concentration, and an alarm buzzer andalarm LEDs alert you to the presence of hazardous lev-els. The IQ-250 does not incorporate a sample pump, andsamples by diffusion only. User adjustable setpoints areprovided for low, mid, and high alarm levels. The unitoperates on 4 AA size alkaline or nicad batteries, or theAC adapter/charger. The IQ-250 weighs approximately22 ounces, including batteries.

SINGLE GAS PORTABLE WITH SAMPLE PUMP MODEL IQ-350

ISTs Model IQ-350 is a single gas portable instrumentwhich provides all of the features of the IQ-250 and in addition comes standard with a built-in sampling pump.Like the IQ-250, it can be equipped with either a solidstate or electrochemical sensor and can be configured todetect any one of over 150 toxic and combustible gases.The unit operates 20 hours on 4 C size alkaline or nicadbatteries, or the AC adapter/charger. The IQ-350 weighsapproximately 30 ounces, including batteries.

PORTABLES from ppm to 20% by volume, with the lower ranges of-fering better resolution. CO is available in % volumeranges, and hydrocarbon ranges are available from %LELup to 100% by volume, depending upon the gas.

PHOTOIONIZATION DETECTOR (PID)Photoionization detectors (PID) operate by ionizing the

target gas with ultra-violet radiation, and then collectingthe ions across a high voltage plate which produces anelectrical signal proportional to the gas present. PIDsoffer fast response for many Volatile Organic Compounds(VOCs), including, among others, benzene, vinyl chlo-ride, phosphine, and hexane.

ELECTROCHEMICALElectrochemical sensors operate by producing a chemi-

cal reaction with the gas of interest. Sensors are availablefor certain toxic gases in ppm ranges, including NH3, CO,Cl2, H2, HCl, HCN, H2S, NO, NO2, O2, O3, and SO2. Forsome of these gases, electrochemical sensors can offer afairly high degree of selectivity. Electrochemical sensorshave a life expectancy of 1 to 2 years and come with a 1year warranty.

CATALYTIC BEADCatalytic Bead sensors operate by burning combustible

gases, raising the temperature of the sensor. This temper-ature rise changes the resistance of the sensor andproduces a signal proportional to the gas concentration.They detect combustible gases in higher concentrations(above 1000 ppm) only. They are not selective and will re-spond to a wide range of combustible gases. However,since they only detect higher gas concentrations, they arenot prone to interference from many toxic gases. CatalyticBead sensors have a life expectancy of 2 years and comewith a 1 year warranty.

GAS SENSORS

To help you select the most appropriate sen-sor for your application, contact IST toreceive additional assistance and a copy ofISTs Sensor Selection Guide.

1 ISTS PATENTED SOLID STATE SENSOR

2 INFRARED SENSOR (IR)

3 CATALYTIC BEAD SENSOR

4 ELECTROCHEMICAL SENSOR

5 PHOTOIONIZATION DETECTOR (PID)

1 2 3 4 5

IST offers 5 different types of sensors: Solid State, Infrared, Photoionization, Catalytic Bead, andElectrochemical. This gives you the flexibility to choosethe best sensor(s) for your particular application. A briefdescription of each sensor type follows:

SOLID STATESolid State sensors are made of a heated metal oxide

material which temporarily changes resistance in thepresence of gas. Solid State sensors are available for thedetection of over 150 different toxic and combustiblegases, in ranges from low ppm %LEL. A list of gases andranges appears on the back of this brochure. Solid Statesensors come with a 3 year warranty, and have a life ex-pectancy in excess of 10 years.

INFRARED SENSOR (IR)Infrared (IR) sensors detect gases that absorb light in

the infrared spectrum. Sensors for carbon dioxide (CO2),carbon monoxide, and hydrocarbons (such as Methane,etc.) are currently available. IR sensors offer good selec-tivity and good lifetimes. Ranges for CO2 are available

4 GAS, CONFINEDSPACE ENTRYPORTABLEMODEL IQ-200

ISTs Model IQ-200 requiresjust two sensors for confinedspace entry applications, asingle solid state sensor forCO, H2S, and combustiblegases, and an electrochemicalsensor for oxygen. This makes theIQ-200 much more affordable than comparable confinedspace entry portables. Additionally, both the solid stateand oxygen sensors used in the IQ-200 are long-life sen-sors. Typical life expectancy is 5 years for the O2 sensorand over 10 years for the solid state sensor. This results ina tremendous savings in long term operating costs asso-ciated with sensor replacement.

The IQ-200 has an audible alarm buzzer, and alarmLEDs indicate low, mid, and high alarm levels for thesolid state sensor, and low and high alarms for the O2 sen-sor. The IQ-200 does not incorporate a sample pump andsamples by diffusion only. It is small and lightweight,weighing just 22 ounces, including batteries. It operateson 4 size AA alkaline or nicad batteries, or the ACadapter/charger. Carrying case is included.

SOLID STATE SENSOR GAS LIST

The following gases are available for detection using ISTs Solid State Sensors. The full-scale ranges listed are standard rangesavailable. For toxic gas monitoring, ranges are typically chosen which are higher than the TLV so that hazardous levels will be detected (TLV is defined as a SAFE level). For combustible gases, the typical range is 0-100 % LEL. Other ranges can also be providedplease contact IST for information. The following information is valid as of 11/97.

GAS FULL-SCALE RANGESAcetic Acid 100, 200 ppmAcetone 100, 200, 500, 1000, 5000 ppm, % LELAcetonitrile 100 ppmAcetylene 50 ppm, % LEL, 3% by VolumeAcrolein (Acrylaldehyde) 50 ppmAcrylic Acid 100 ppmAcrylonitrile 50, 60, 80, 100, 200, 500 ppm, % LELAllyl Alcohol % LELAllyl Chloride 200 ppmAmmonia 50, 70, 75, 100, 150, 200, 300, 400, 500,

1000, 2000, 2500, 4000, 5000 ppm, 1%,2%, 10% by Vol., 10%, 25%, 100% LEL

Anisole 100 ppmArsenic Pentafluoride 5 ppmArsine 1, 10 ppmBenzene 50, 75, 100, 1000 ppm, % LELBiphenyl 50%, 100% LELBoron Trichloride 500 ppmBoron Trifluoride 500 ppmBromine 20 ppmButadiene 50, 100, 3000 ppm, % LELButane 400, 1000 ppm, 100%, 200% LELButanol 1000 ppm, 100% LELButene 100% LELButyl Acetate 100 ppm, % LELCarbon Disulfide 50, 60, 100 ppm, 5% by VolumeCarbon Monoxide 50, 100, 150, 200, 250, 300, 500, 1000,

3000, 5000 ppm, 3%, 5% by Volume, % LELCarbon Tetrachloride 50, 100, 10000 ppmCellosolve Acetate 100 ppmChlorine 10, 20, 50, 100, 200 ppmChlorine Dioxide 10, 20 ppmChlorobutadiene 100% LELChloroethanol 200 ppmChloroform 50, 100, 200 ppmChlorotrifluoroethylene 100% LELCumene 100% LELCyanogen Chloride 20 ppmCyclohexane 100 ppm, 100% LELCyclopentane 50 ppmDeuterium 50%, 100% LELDiborane 10, 50 ppmDibromoethane 50 ppmDibutylamine 100% LELDichlorobutene 1% by VolumeDichloroethane (EDC) 50, 100 ppm, % LELDichlorofluoroethane 100, 1000 ppmDichloropentadiene 50 ppmDichlorosilane 50, 100 ppmDiesel Fuel 50 ppm, 100% LELDiethyl Benzene 100% LELDiethyl Sulfide 10 ppmDifluorochloroethane 100% LELDifluoroethane (152A) 100% LELDimethyl Ether 100% LELDimethylamine (DMA) 30, 50 ppmEpichlorohydrin 50, 100, 500, 1000 ppmEthane 1000 ppmEthanol 200, 1000, 2000 ppm, % LELEthyl Acetate 200, 1000 ppm, % LELEthyl Benzene 200 ppm, % LELEthyl Chloride 100 ppm, % LELEthyl Chlorocarbonate 1% by VolumeEthyl Ether 100, 800, 1000 ppm, % LELEthylene 100, 1000, 1200 ppm, % LELEthylene Oxide 5, 10, 20, 30, 50, 75, 100, 150, 200, 300,

1000, 1500, 2000, 3000 ppm, % LELFluorine 20, 100 ppmFormaldehyde 15, 50, 100, 500, 1000 ppmFreon-11 1000, 2000, 5000 ppmFreon-12 1000, 2000, 3000 ppmFreon-22 100, 200, 500, 1000, 2000 ppmFreon-113 100, 200, 500, 1000, 2000 ppm, 1% by Vol.Freon-114 1000, 2000, 20000 ppmFreon-123 1000 ppmFuel Oil or Kerosene 100% LELGasoline 100, 1000, 2000, 20000 ppm, % LELGermane 10, 50 ppmHeptane 1000 ppm, % LEL

GAS FULL-SCALE RANGESHexane 50, 100, 200, 2000, 2500, 3000 ppm, % LELHexene % LELHydrazine 5, 10, 20, 100, 1000 ppm, 1% by VolumeHydrogen 50, 100, 200, 500, 1000, 2000, 5000 ppm,

3%, 5% by Vol., 2% to 100% LELHydrogen Bromide 50 ppmHydrogen Chloride 50, 100, 200, 400, 500, 1000 ppmHydrogen Cyanide 20, 30, 50, 100, 200, 1000, 10000 ppmHydrogen Fluoride 20, 50, 100, 200 ppmHydrogen Sulfide 5, 10, 20, 30, 50, 100, 300, 1000 ppm,

% LELIsobutane 1000, 3000 ppm, % LELIsobutylene % LELIsopentane 1000 ppm Isoprene % LELIsopropanol 200, 400, 500, 1000 ppm, % LELJP4 1000 ppm, % LELJP5 1000, 5000 ppm, % LELMethane 100, 200, 1000, 1500, 2000, 5000 ppm,

1%, 2% by Volume, 100%, 200% LELMethanol 200, 300, 400, 500, 1000, 2000, 5000 ppm,

15%, 30%, 100% LELMethyl Acetate 30 ppmMethyl Acrylate 60 ppmMethyl Bromide 20, 50, 60, 100, 500, 1000, 10000,

40,000 ppmMethyl Butanol % LELMethyl Cellosolve % LELMethyl Chloride 100, 200, 300, 2000, 10000 ppm, % LELMethyl Ethyl Ketone 100, 500, 1000, 4000 ppm, 100% LELMethyl Hydrazine 5 ppmMethyl Isobutyl Ketone 200, 500, 2000 ppm, 50%, 100% LELMethyl Mercaptan 30 ppmMethyl Methacrylate 100 ppm, % LELMethyl-Tert Butyl Ether 100% LELMethylene Chloride 20, 100, 200, 300, 400, 500, 600, 1000,

2000, 3000, 5000 ppm, % LELMineral Spirits 200, 3000 ppm, % LELMonochlorobenzene 100% LELMonoethylamine 30, 100, 1000 ppmMorpholine 500 ppmNaptha 1000 ppm, 100% LELNatural Gas 1000, 2000 ppm, 2%, 4% by Volume, % LELNitric Oxide 20, 50 ppmNitrogen Dioxide 20, 50, 100 ppmNitrogen Trifluoride 50, 500, 1000 ppmNonane 2000 ppmPentane 200, 1000 ppm, % LELPerchloroethylene 200, 1000, 2000, 20000 ppmPhenol 100 ppmPhosgene 50 ppmPhosphine 3, 5, 10, 20, 30, 50 ppmPhosphorus Oxychloride 200 ppmPicoline % LELPropane 100, 1000 ppm, 100% LELPropylene 100, 200, 1000, 5000 ppm, %LELPropylene Oxide 100 ppm, % LELSilane 10, 20, 50 ppmSilicon Tetrachloride 1000 ppmSilicon Tetrafluoride 1000 ppmStyrene 200, 300 ppm, % LELSulfur Dioxide 50, 100 ppmTetrahydrofuran 200, 300, 1000 ppm, % LELTetraline 100 ppmToluene 50, 100, 200, 500, 2000, 5000 ppm, % LELToluene Diisocyanate 15 ppmTrichloroethane 50, 100, 500, 1000 ppm, 1% by VolumeTrichloroethylene 50, 100, 200, 300, 500, 1000, 2000 ppm, %LELTriethylamine (TEA) 100 ppmTrifluoroethanol 25, 100 ppmTrimethylamine (TMA) 50 ppmTungsten Hexafluoride 50 ppmTurpentine % LELVinyl Acetate 1000 ppm, % LELVinyl Chloride 20, 50, 100, 200, 400, 500, 1000, 4000,

10000 ppm, 10%, 100% LELVinylidene Chloride 50 ppmXylene 100, 200, 300, 1000 ppm, 1% by Volume

INTERNATIONAL

SENSOR TECHNOLOGY

The Leader In Gas Detection Since 1972

3 Whatney Irvine, California 92618-2824 Telephone 949-452-9000 FAX 949-452-9009e-mail: ist@intlsensor.com website: www.intlsensor.com

For further information on any product,

please contact IST or our authorized representative.

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