The ACI P51-750-S-U-P-20MA-000-000 is a 304L stainless steel sealed gage pressure transducer from the ACI P51 Series, built for accurate, reliable measurement in commercial, industrial and process-control applications where performance is critical. The P51-750-S-U-P-20MA-000-000 is configured for a 750 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 its zero output 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 P51-750-S-U-P-20MA-000-000 is a bulk micro-machined transducer with a welded 304L stainless steel diaphragm that contains no O-rings, making the P51-750-S-U-P-20MA-000-000 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 7/16"-20-2B Female Schrader (1/4" Flare w/ Depressor) fitting in 304L Stainless Steel with a 5/8" Hex wrench flat, and the unit terminates in a Packard 3-pin connector; the mating cable harness (A/GP) is ordered separately. As a PSIS unit, the P51-750-S-U-P-20MA-000-000 is sealed (not vented to atmosphere) and is calibrated to read its zero output at +14.5 PSIA.
Warranty
LIMITED
WARRANTY
Manufacturer-backed coverage. ACI P51 Series transducers carry a Two (2) Year Limited Warranty. ZOT Supply is an authorized ACI distributor; the P51-750-S-U-P-20MA-000-000 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 stainless steel sensing element with welded construction and no O-rings. The P51-750-S-U-P-20MA-000-000 delivers stable, drift-resistant performance and broad media tolerance across a wide pressure and temperature range.
4 to 20 mA Output
The P51-750-S-U-P-20MA-000-000 provides a linear 4 to 20 mA (2-Wire, Loop Powered) signal proportional to the applied pressure. Loop-powered 2-wire installation that 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.
7/16"-20-2B Female Schrader (1/4" Flare w/ Depressor) Process Connection
The P51-750-S-U-P-20MA-000-000 connects through a 7/16"-20-2B Female Schrader (1/4" Flare w/ Depressor) male fitting machined from 304L Stainless Steel, with a 5/8" Hex wrench flat. Recommended install torque is 120 lbs-in (13.56 Nm). Use thread sealant; do not use a strap wrench on the body.
Robust Overpressure & Environmental Margin
Proof pressure: 3X FS. Burst pressure: 10X FS or 15,000 PSI (whichever is less). Vibration tested 144 hours (100–2000 Hz, 20g sinusoidal, 3 axes). Operating range -40 to 257°F (-40 to 125°C). The P51-750-S-U-P-20MA-000-000 tolerates demanding service environments.
Recognized Approvals
The P51-750-S-U-P-20MA-000-000 is built to UKCA, CE, RoHS2, WEEE and ISO 9001 standards, with 150 V/m EMC immunity. Optional NIST calibration certificate (GP NIST) available as a separate line item.
Technical Specifications
| Specification | Value |
|---|---|
| Model | P51-750-S-U-P-20MA-000-000 |
| Pressure Sensing Type | Sealed Gage Pressure (PSIS) |
| Full Scale Pressure Range | 750 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 |
| Output Load Impedance | 800 Ohms maximum @ 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 | 10X FS or 15,000 PSI (whichever is less) |
| 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 |
| Housing Material | Stainless Steel |
| Process Fitting Material | Thread | 304L Stainless Steel | 7/16"-20-2B Female Schrader (1/4" Flare w/ Depressor) |
| Wrench Flat | 5/8" Hex |
| Recommended Torque | 120 lbs-in (13.56 Nm) |
| Wiring Connection | A Packard 3-pin connector; the mating cable harness (A/GP) is ordered separately |
| Wiring | 2-Wire loop: Power (Red) to supply +, Return (White) to the controller current input, Shield (Green) to earth ground |
| NIST Calibration Certificate | Optional, ordered separately (GP NIST) |
| Approvals | UKCA, CE, RoHS2, WEEE, ISO 9001 |
| EMC Compatibility | 150 V/m |
| Product Dimensions (L x Dia) | 2.60" (66.6 mm) L x 0.875" (22.23 mm) Dia |
| Product Weight | 0.32 lbs (0.145 kg) |
| Minimum Order Quantity | 10 Units |
| Manufacturer Part Number | P51-750-S-U-P-20MA-000-000 |
Documentation
Frequently Asked Questions
What does the P51-750-S-U-P-20MA-000-000 measure?
The P51-750-S-U-P-20MA-000-000 is a sealed gage pressure transducer with a 750 PSI full-scale range. It measures pressure relative to a sealed vacuum reference chamber and is calibrated to read its zero output at +14.5 PSIA. Proof pressure is 3X FS and burst pressure is 10X FS or 15,000 PSI (whichever is less), giving substantial overpressure margin.
What output does the P51-750-S-U-P-20MA-000-000 provide and how is it wired?
The P51-750-S-U-P-20MA-000-000 provides a 4 to 20 mA (2-Wire, Loop Powered) output. 2-Wire loop: Power (Red) to supply +, Return (White) to the controller current input, Shield (Green) to earth ground.
What media is the P51-750-S-U-P-20MA-000-000 compatible with?
The welded 304L stainless steel diaphragm of the P51-750-S-U-P-20MA-000-000 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 of compatible media.
Does the P51-750-S-U-P-20MA-000-000 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 P51-750-S-U-P-20MA-000-000 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.
Why is there a 10-piece minimum order quantity?
The P51-750-S-U-P-20MA-000-000 is a factory-direct ACI product configured to your selected pressure range, port, connector and output. ACI sets a minimum order quantity of ten (10) pieces on these built-to-order P51 SKUs. ZOT Supply passes this minimum through directly — orders below 10 units cannot be processed. If you need a different configuration, a different quantity, or have a project-specific question, contact ZOT Supply and we will work with you on the best path forward.
- Pressure Type:
- Single
- Pressure Sensing:
- Sealed Gage
- Media:
- Wet
- Pressure Range:
- 750 PSI
- Output Signal:
- 4-20mA
- Process Connection:
- Schrader
- Wetted Material:
- 304L Stainless Steel
- Min Order Qty:
- 10 Units
