Seven Steps to Selecta Pressure Gauge

Pressure Gauge Options

B ULLETIN G703/08 7.5M BP

4. MEDIA / WETTED PARTSThe wetted parts of the pressure gauge, the Bourdon tube and socket must be compatible with the process media. If not compatible with the wetted parts of the gauge, corrosion will occur. Corrosion of gauge wetted parts will eventually cause gauge failure and possibly safety issues. When the gaugewetted parts are not compatible with the process media, a diaphragm should be considered.

7. PRESSURE RANGESASME B40.100 recommends that normal operating pressure be con�ned to 25%-75% of the scale. If pulsation is present in the process, maximum operating gauge pressure should not exceed 50% of the full-scale range. CONCLUSIONTo properly select a pressure gauge, consider the gauge process, range, environment, accuracy, dial size, connection and mounting requirements.

3. CASE STYLE / MATERIALEnvironmental considerations include ambient temperature, air-borne particulate, condensation, humidity, water and chemicals, all of which can a�ect gauge performance. Ambient temperature may a�ect the accuracy and integrity of the gauge. Gauges are available either temperature compensated or non-temperature compensated. Ambient conditions may require that the gauge be isolated from temperature extremes. When required, the gauge should be isolated fromtemperature extremes with a �exible line assembly.When ambient conditions are corrosive, contain a large number of particulate or if the gauge will be exposed to a wet or humid environment like humidity, wash-downs or rain, specify a gauge that is weatherproof/hermetically sealed or liquid �lled.

1. ACCURACYFor a mechanical pressure gauge, accuracy is de�ned as a percentage of the full-scale range. While requirements di�er from one industry to another, the following are general guidelines:• Test Gauges and Standards: 0.25% through 0.10% full scale accuracies.• Critical Processes: 0.5% full scale accuracy.• General Industrial Processes: 1.0% accuracy. Less Critical Commercial Uses: 2.0% accuracy.

Refer to ASME B40.100 or the DIN speci�cations for more information on accuracy.

2. DIAL SIZEPressure gauge dial sizes range from 11⁄2˝ to 16˝ diameters. Generally, readability requirements, space limitations and required gauge accuracy determine dial size. Accuracies of 0.25% or 0.5% generally have dial sizes of 41⁄2˝ or larger since more dial graduations are required.

5. CONNECTION SIZEGauges are available with a variety of connections including NPT, DIN, JIS, BSP & SAE. Process pressure gauges with 41⁄2˝ dial sizes or larger are most often supplied with a 1⁄2˝ NPT connection to best support the gauge. Factors to consider when selecting a pressure gauge connection include process pressures, gauge size and weight, space limitations, leak integrity, and past experience.

6. CONNECTION LOCATIONConsider the following mounting options when selecting a pressure gauge:• Stem mount lower connect• Wall/surface mount lower connect• Panel mount back connect• U-clamp �ush mount back connect, for panel mounting• Front �ange �ush mount back connect, for panel mounting

TEST

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1008

S

GENE

RAL

SERV

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SPEC

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SER

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1005

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0SE

RIE

S

1009

(41 / 2

,̋6˝)

1009

(21 / 2

,̋31 / 2˝

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PRO

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CODE DESCRIPTION PRESSURE GAUGE TYPE

STAINLESS STEEL CASE INDUSTRIAL GAUGESTEST & PROCESS GAUGES COMMERCIAL GAUGES

NOTES: The options listed above are only a partial listing. For other options on these or other pressure instruments please call the factory for availability.(1) Available on 40mm and 50mm.(2) Excludes type 1259.

Not all variations available for each size, connection, range in a specific gauge, model/type; minimums may apply

XLL PLUS! ™ PerformanceXSF FlutterGuard™ STDXNP Nickel Plated SocketXBF WaII mounting bracketXFW Back flangeXFF Front flangeXUC U-clamp STDXLJ Dry liquid-fillable gaugeXOS Overload stop STD STD STD(1)

(2)

XVS Underload stop STD STD STD(1)

XTS Throttle screwXT(2) Throttle plug STDXS4 Slotted link movement (decrease)XRJ Slotted link (increase)XAP Adjustable pointerXMP Micrometer pointer STD STD STDXSH Red set hand stationaryXEO Red set hand adjustableXEP Maximum pointerXEQ Minimum pointerXPD Plastic window STD STD(1) STD STD STD STD STD STDXSG Safety glassXMG Metric version gaugeXDA Dial markingXNN Paper tagXNH Stainless steel tagXAB Absolute pressureXAJ 1⁄2% optional accuracy STDXAN 1% optional accuracy STD STD STDXRA Retard scaleXWN White dial STD STD STD STD STD STD STD STD STDXBD Black dialX6B Oxygen-cleaned gauges (gaseous)XTB Tip bleedXED High and low electric contactsXEE Double high-electric contactsXEF Double low-electric contactsXEG Electric contacts off at low or

high and in-betweenXGV Silicone-filled gaugeXGX Halocarbon-filled gaugeXCH Carrying handleXC4 Calibration Chart

1490

/149

5SE

RIE

S

1008

A/30

05/3

005P

1007

P

1005

/100

0SE

RIE

S

1100

1T

3-2-3%

2-1-2% 1.0%

0.25%0.5%

(800) 576 - 6308www.ashcroft-usa.comDistributed By Inc,

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1005P1005S1000

1007P1008A2071A3005

3005P12MFX/15MFX12DDG/15DDG

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Seven Steps to Pressure Gauge Selection

DIAL SIZE CASESTYLE MATERIAL RANGEPROCESS MEDIA

(GAUGE WETTED PARTS)CONNECTION

SIZECONNECTION

LOCATION

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DIF

FERE

NTI

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COM

MER

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LESS

STEE

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SE&

IND

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GAUG

ESPR

OCE

SSGA

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TEST

GAUG

ES

SANITARYGAUGES

NOTE: Some model numbers may not be available in all sizes, ranges and connections.

PRODUCTCATEGORY

BULLETIN G7

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