The ACI GP(0-500S)-20-P is a 304L stainless steel sealed gage pressure transducer from the ACI GP Series, built for accurate, reliable measurement in commercial, industrial and process-control applications. The GP(0-500S)-20-P is configured for a 500 PSI full-scale range and delivers a linear 4 to 20 mA (2-Wire, Loop Powered) output. It measures pressure relative to a sealed vacuum reference chamber and is calibrated to read 4 mA at +14.5 PSIA, with a factory-calibrated accuracy of < +/- 0.5% FS (including hysteresis, repeatability and non-linearity, BFSL).
At the core of the GP(0-500S)-20-P is a bulk micro-machined transducer with a welded 304L stainless steel diaphragm that contains no O-rings, making the GP(0-500S)-20-P compatible with virtually any gas or liquid that is compatible with 304L stainless steel — including refrigerants, glycol, motor oil, diesel, hydraulic fluid, brake fluid, water, waste water, hydrogen, nitrogen and air. The process connection is a 1/4"-18 NPT male fitting in 304L stainless steel, and the unit terminates in a 3-pin Packard connector (a mating A/GP cable harness is ordered separately). As a PSIS unit, the GP(0-500S)-20-P is sealed (not vented to atmosphere) and is calibrated to read 4 mA at +14.5 PSIA, allowing it to substitute for a conventional gage transducer in most applications.
Warranty
LIMITED
WARRANTY
Manufacturer-backed coverage. ACI GP Series transducers carry a Two (2) Year Limited Warranty. ZOT Supply is an authorized ACI distributor; the GP(0-500S)-20-P ships factory-new with full manufacturer warranty intact and access to ACI technical support. Full terms appear in the front of ACI’s Sensors & Transmitters catalog and at workaci.com.
Key Features
Bulk Micro-Machined Stainless Diaphragm
Solid-state 304L stainless steel sensing element with welded construction and no O-rings. The GP(0-500S)-20-P delivers stable, drift-resistant performance and broad media tolerance.
4 to 20 mA Loop-Powered Output
Linear 4-20 mA signal proportional to the applied pressure. 2-wire loop-powered installation integrates directly with PLCs, BAS controllers, recorders, and data-acquisition systems.
< +/- 0.5% FS Accuracy
Total accuracy spec at 22°C (71.6°F) of < +/- 0.5% FS that includes hysteresis, linearity and repeatability (BFSL). Long-term stability of +/- 0.03% FS @ 0 PSIG.
Packard 3-Pin Connector
Industry-standard Packard connector for clean, vibration-resistant installation. Use with a separate A/GP cable harness (2’ through 40’, plenum or metal-clad) sized to your installation.
Robust Overpressure & Environmental Margin
Proof pressure: 3X FS. Burst pressure: 3X FS. Vibration tested 144 hours (100–2000 Hz, 20g sinusoidal, 3 axes). Operating range -40 to 257°F (-40 to 125°C).
Recognized Approvals
Built to CE, RoHS2, WEEE and ISO 9001 standards, with 10 V/m EMC compliance (EN61000-4-3). Optional NIST calibration certificate (GP NIST) available as a separate line item.
Technical Specifications
| Specification | Value |
|---|---|
| Model | GP(0-500S)-20-P |
| Pressure Sensing Type | Sealed Gage Pressure (PSIS) |
| Full Scale Pressure Range | 500 PSI |
| Accuracy @ 22°C (71.6°F) | < +/- 0.5% FS (Hysteresis, Repeatability, Non-linearity BFSL) |
| Output Signal | 4 to 20 mA (2-Wire, Loop Powered) |
| Supply Voltage | 250 Ohm Load: +13 to 30 VDC | 500 Ohm Load: +18 to 30 VDC |
| Supply Current | 25 mA minimum |
| Maximum Load Resistance | 800 Ohms @ 24 VDC | Formula: (Supply VDC - 8 VDC) / 0.020A |
| Reverse Polarity Protection | +/- 16 V over 5 minutes |
| Thermal Error (-40 to 105°C) | < +/- 0.5% FS |
| Stability (250 Hrs @ 225°F) | +/- 0.03% FS @ 0 PSIG; +/- 0.12% FS @ 1000 PSIG |
| Response Time | < 1 ms |
| Proof Pressure | 3X FS |
| Burst Pressure | 3X FS |
| Thermal Shock | 300 Cycles (105°C to -40°C, 0.5 hr soaks @ Temperature, 2s Transfer) |
| Vibration | 144 Hours (100 to 2000 Hz, 20g Sinusoidal, 3 Axes) |
| Operating Temperature | -40 to 257°F (-40 to 125°C) |
| Storage Temperature | -40 to 176°F (-40 to 80°C) |
| Operating Humidity | 0 to 95% RH, non-condensing |
| Media Type | Any gas or liquid compatible with 304L Stainless Steel |
| Transducer Housing Material | Stainless Steel |
| Process Fitting Material | Thread | 304L Stainless Steel | 1/4"-18 NPT |
| Recommended Torque | 150 lbs-in (16.95 Nm) |
| Wiring Connection | Packard 3-Pin Connector (A/GP cable harness ordered separately) |
| Wiring | 2-Wire loop: Power (Red) to supply +, Return (White) to controller current input, Shield to earth ground. Black wire not used. |
| NIST Calibration Certificate | Optional, ordered separately (GP NIST) |
| Approvals | CE, RoHS2, WEEE, ISO 9001 |
| EMC Compliance | 10 V/m (EN61000-4-3) |
| Product Dimensions (L x Dia) | 2.60" (66.6 mm) L x 0.87" (22.23 mm) Dia |
| Product Weight | 0.30 lbs (0.13 kg) |
| Manufacturer Part Number | GP(0-500S)-20-P |
Required & Compatible Accessories
Documentation
Frequently Asked Questions
What does the GP(0-500S)-20-P measure?
The GP(0-500S)-20-P is a sealed gage pressure transducer with a 500 PSI full-scale range. It measures pressure relative to a sealed vacuum reference chamber and is calibrated to read 4 mA at +14.5 PSIA. Proof and burst pressure are both 3X FS.
What output does the GP(0-500S)-20-P provide and how is it wired?
The GP(0-500S)-20-P provides a 4 to 20 mA (2-Wire, Loop Powered) output. 2-Wire loop: connect Power (Red) to supply +, Return (White) to the controller current input, and Shield to earth ground. The black wire is not used.
What media is the GP(0-500S)-20-P compatible with?
The welded 304L stainless steel diaphragm of the GP(0-500S)-20-P contains no O-rings, so it is compatible with any gas or liquid compatible with 304L stainless steel — refrigerants, glycol, oils, water, waste water, hydrogen, nitrogen and air. See the 304L Chemical Compatibility Chart linked in the Documentation section for a full list.
Does the GP(0-500S)-20-P need a pressure snubber?
ACI recommends a 1/4" stainless steel snubber (A/0.25" SNUB A/G for air and gas, or A/0.25" SNUB WTR for water and light oils) with the GP(0-500S)-20-P to smooth out pressure spikes, surges and pulsations and to keep debris out of the sensor diaphragm. For steam service, an A/Syphon pigtail (90°, 180° or 270°) is also recommended.
Does the GP(0-500S)-20-P include a cable harness?
Yes. The GP(0-500S)-20-P terminates in a 3-pin Packard connector and requires a mating A/GP cable harness, ordered separately. Plenum-rated harnesses are available in 2’, 6’, 10’, 20’, 30’ and 40’ lengths; metal-clad versions are available in 10’ and 20’.
- Pressure Type:
- Single
- Pressure Sensing:
- Sealed Gage
- Media:
- Wet
- Pressure Range:
- 500 PSI
- Output Signal:
- 4-20mA
- Process Connection:
- 1/4 inch NPT
- Wetted Material:
- 304L Stainless Steel
- Connection:
- Packard 3-Pin
