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PTC® Pressure Gauge Guide & Range Chart
Pressure Gauges from PTC Instruments are offered in a wide variety of sizes, ranges, and configurations to meet the demands of many applications. General Purpose, Industrial,
Safety and Test Gauges from full vacuum to 50,000 psi.
General service gauges measure the pressure of noncorrosive gases and liquids such as air, water and steam. The Bourdon pressure tube and connection are made of copper alloy
such as brass or bronze. Corrosive gauges measure the pressure of mild acids and bases. The Bourdon pressure tube and connection are usually Type 316 stainless steel.
For highly corrosive media a diaphragm seal is recommended. See our Pressure Gauge Guide below.
Our laboratory has the capabilities to calibrate general purpose gauges, utility, industrial and process gauges, test gauges, pressure recorders and data loggers.
Our certificate number 1896.01 from A2LA also covers calibration of durometers, temperature, *pressure, *relative humidity, and *infrared black body thermometers.
Click on the link to view our scope of our accreditation. The ILAC (International Laboratory Accreditation Cooperation) arrangement provides a technical
basis to international trade by promoting global member and customer confidence and acceptance of accredited laboratory data.
Pressure Calibration and Certification from 6 to 12140 PSIG
 Click image for close-up
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Pressure Gauge Guide
Model
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Description
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Case
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Wetted Parts
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Dial Size
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NPT
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PD
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General Purpose
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Black Steel or SS (Dry)
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Cooper Alloy
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1.5"
2"
2.5"
4"
6"
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1/8"
1/4"
1/2"
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PG
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Industrial Crimped Ring
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SS (Fillable)
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Cooper Alloy
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2.5"
3"
4"
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1/8"
1/4"
1/2"
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PM
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Industrial Crimped Ring
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304SS (Fillable)
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316SS
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2.5"
4"
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1/8"
1/4"
1/2"
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PR
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Industrial Heavy Duty Repairable
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304SS (Fillable)
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316SS
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2.5"
4"
6"
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1/8"
1/4"
1/2"
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PT
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Process Gauge
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Fiberglass Reinforced Thermoplastic (Fillable)
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316SS
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4.5"
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1/4"
1/2"
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PA
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4" Industrial ABS
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ABS (Fillable)
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316SS or Copper Alloy
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4"
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1/4"
1/2"
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PS
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All SS Safty Gauge
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304SS Blowout Back (Fillable)
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316SS
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4"
6"
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1/4"
1/2"
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PL
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Test Gauge
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304SS
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316SS
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6"
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1/4"
1/2"
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PC
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Low Pressure Diaphragm (Capsule) Gauge
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Black Steel or SS
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Cooper Alloy
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2.5"
4"
6"
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1/8"
1/4"
1/2"
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Range Chart
Code
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Ranges
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Pressure Ranges
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P01
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Vacuum
-30-0 "HG
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Code
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PSI
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Compound Ranges
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P15
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0-15
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Code
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"Hg psi
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P16
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0-30
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P02
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-30-0-15
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P17
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0-60
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P03
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-30-0-30
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P18
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0-100
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P04
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-30-0-60
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P19
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0-160
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P05
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-30-0-100
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P20
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0-200
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P06
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-30-0-160
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P21
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0-300
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P07
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-30-0-200
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P22
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0-400
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P08
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-30-0-300
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P23
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0-600
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P24
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0-800
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P25
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0-1000
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P30
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0-1500
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P31
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0-2000
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P32
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0-3000
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P33
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0-4000
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P34
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0-5000
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P35
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0-6000
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P36
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0-8000
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P37
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0-10000
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P38
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0-15000
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P39
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0-20000
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P40
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0-30000
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P41
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0-40000
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P42
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0-50000
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P60
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3-15 Receiver
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Code
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Ranges
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Low Pressure Ranges
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Inches Water
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P50
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0-10
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P51
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0-15
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P52
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0-30
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P53
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0-60
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P54
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0-100
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P55
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0-160
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P56
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0-200
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oz/in2
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Z52
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0-20
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Z53
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0-30
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Application Information
- Pressure Actuation is achieved by Bourdon tube movement . C tubes are typically used for lower pressures up to 600 psi, and coiled tubes are used for higher pressures.
- Pressure Ranges: Bourdon tube pressure gauges can measure pressures from full vacuum to 40,000 psi. Generally, a range of twice the working pressure is recommended, with maximum working pressure not exceeding 75% of the range. If pulsation occurs, working pressure should not exceed 65% of the range. Never use a gauge at pressure greater than the maximum range on the dial. PSI ranges are Standard, and several alternate single and dual ranges are available. See Range Chart
- Accuracy: Gauges are available with accuracies from ± 0.25% (ASME grade 3A) to ± 3/2/3% (ASME grade B). Percent accuracies are expressed as percent of full scale.
- Ambient Temperature: Normal ambient temperature limits are -30°F to 150°F (35°C to 65°C) for dry gauges and 23°F to 140°F for glycerine filled gauges. PTC gauges are calibrated at 70°F (20°C). Change in ambient temperatures causes ± 0.3% error per 18°F (10°C) rise/fall, respectively. Ambient error for Test Gauges is ± 0.05% per ± 18°F (10°C)
- Process Temperature: Gauges with stainless steel wetted parts have a welded tube and socket, and will withstand 750°F (400°C). Gauges with soldered copper alloy joints will withstand 150°F (65°C); with silver brazed joints 250°F (120°C). Maximum process temperatures should only be reached intermittently to avoid rupture, and may result in loss of calibration or damage to other parts of the gauge.
- Severe Conditions: In applications involving severe pulsation, the use of snubbers and/or restrictors is recommended. Also, for vibrating or pulsating applications, liquid filling will help prevent wear and extend the service life of the gauge. Glycerine is the standard fill material. Also available (with special gasketing) are silicone and Halocarbon. Halocarbon, though quite costly, is recommended for service with oxidizing agents such as oxygen, hydrogen peroxide,chlorine,nitric acid, ect.
- Pressurized Medium Considerations: All pressure gauge components should be selected to suit characteristics of the fluid being measured. For steam service, a siphon is required. For corrosive chemicals, stainless steel (or monel) wetted parts, or chemical seal should be considered (monel wetted parts are available on special order). For fluids that solidify or leave deposits, a diaphragm seal should be considered. For oxidizing fluids, no oil should be present.
- Mounting: NPT connections are located in the center back, lower back or bottom of the case. Rear flanges are available for surface mounting. For panel mounting front flanges or "U" or "O" clamps are available. Special threads (BSP, Metric, ISO) are also available.
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