The ACI A/WPR2-100-40 is a remote wet to wet differential pressure transmitter for liquid and gas systems with a maximum line pressure of 100 psi. Two remote pressure sensors with 1/4-18 NPT male 304 stainless steel fittings connect to a NEMA 4X/IP66 enclosure through a 40-foot standard CMP-rated PVC cable harness, and the transmitter outputs a field-selectable 4-20 mA, 0-5 VDC or 0-10 VDC signal across four uni-directional (0-100, 0-50, 0-25 and 0-10 psid) or bi-directional (+/-100, +/-50, +/-25 and +/-10 psid) ranges. This model has no display.
Remote mounting of the two sensors reduces installation time and provides mounting flexibility, often eliminating the need for additional plumbing and manifolds. Each sensor uses a ceramic capacitive sensing element with a stainless steel diaphragm and ships with a pressure snubber. The standard cable is Type CMP plenum-rated PVC (UL Standard 444, NEC Article 800). A push-button auto zero and a remote zero terminal cancel offsets from installation and sensor drift.
Differential pressure across pumps, compressors, filters and heat exchangers, and flow monitoring, on systems with a maximum line pressure above 30 psi and up to 100 psi. Choose this standard-cable version where Type CMP plenum-rated cable is required.
Key Features
Uni-directional: 0-100, 0-50, 0-25 and 0-10 psid. Bi-directional: +/-100, +/-50, +/-25 and +/-10 psid. Set by DIP switch with power off; ships in uni-directional mode.
2-wire 4-20 mA, or 3-wire 0-5 VDC, 0-10 VDC or 4-20 mA. Ships set to 0-10 VDC. Accuracy +/-1.0% FSO on the three highest ranges and +/-1.5% FSO on the lowest (0-10 / +/-10 psid).
Ceramic capacitive sensing element with stainless steel diaphragm, 1/4-18 NPT male 304 SS fittings and a pressure snubber for light oils and water on each sensor. High and low sensors are factory-calibrated to the unit.
Type CMP plenum-rated PVC cable (UL Standard 444, NEC Article 800). Packard connector, IP65 at the sensors.
Press ZERO, or short the ZERO terminal to COM for 2 seconds, to cancel offsets from installation and sensor drift.
Flame retardant PC/PBT alloy enclosure (UL94V-0) rated NEMA 4X/IP66, supplied with 4 mounting flanges.
ZOT Supply is an authorized distributor of ACI products.
Technical Specifications
| Specification | Value |
|---|---|
| Manufacturer | Automation Components, Inc. (ACI) |
| Model Number | A/WPR2-100-40 |
| ACI Item Number | 141010 |
| Series | WPR2 Wet to Wet Transmitter |
| Maximum Line Pressure | 100 psi |
| Uni-Directional Ranges | 0-100, 0-50, 0-25 and 0-10 psid |
| Bi-Directional Ranges | +/-100, +/-50, +/-25 and +/-10 psid |
| Factory Settings | Uni-directional mode, 0-10 VDC output |
| Output Signals | 2-wire: linear 4-20 mA DC (field selectable) | 3-wire: 0-5 VDC, 0-10 VDC (default) and 4-20 mA (field selectable) |
| Supply Voltage, 4-20 mA Output | 18-36 VDC (250 ohm load max.) / 20-36 VDC (500 ohm load max.) / 24 VAC (+/-10%) 50/60 Hz |
| Supply Voltage, 0-5 / 0-10 VDC Output | 16-36 VDC / 24 VAC (+/-10%) 50/60 Hz |
| Supply Current | 4-20 mA output: 24 mA minimum | 0-5 / 0-10 VDC outputs: 6 mA minimum |
| Output Load Resistance | 4-20 mA: 500 ohms maximum | 0-5 / 0-10 VDC: 5K ohms minimum |
| Accuracy, Three Highest Ranges | +/-1.0% FSO (includes linearity, hysteresis and repeatability at 71°F / 21.5°C) |
| Accuracy, Lowest Range | +/-1.5% FSO (lowest range: 0-10 / +/-10 psid) |
| Thermal Effects | +/-2.0% FSO from 32-140°F (0-60°C), relative to 71°F (21.5°C) |
| Response Time (0-100% FSO) | 8 seconds |
| Output Update Rate | 1 second |
| Warm Up Time | 15 minutes (wait 15 minutes before zeroing) |
| Sensing Element | Ceramic capacitive, stainless steel diaphragm |
| Proof Pressure | 200 psi |
| Burst Pressure | 1000 psi |
| Media Types | Any gas or liquid compatible with 304L or 316L stainless steel |
| Process Fitting | 1/4-18 NPT male, 304 SS; pressure snubber included for light oils/water |
| Recommended Torque | 150 in-lb (16.95 Nm) |
| Operating Temperature | Transducer: -40 to 257°F (-40 to 125°C) | Electronics/housing/cables: 32 to 167°F (0 to 75°C) |
| Compensated Temperature Range | 32 to 140°F (0 to 60°C) |
| Storage Temperature | -13 to 176°F (-25 to 80°C) |
| Operating Humidity | 10 to 90% RH, non-condensing |
| Cable Harness | 40 ft, standard PVC |
| Transducer Cable Rating | Type CMP, plenum rated (UL Standard 444), NEC Article 800 |
| Sensor Connector | Packard connector, IP65 at the sensors |
| Display | None |
| Zero Function | Push-button auto zero and remote zero terminal |
| Enclosure Material | Flame retardant PC/PBT alloy, UL94V-0 |
| Enclosure Rating | NEMA 4X/IP66 |
| Mounting | 4 mounting flanges supplied |
| Dimensions (L x W x D) | 5.30 x 5.07 x 3.00 in (13.46 x 12.88 x 7.62 cm) |
| Product Weight | 3 lb (1.363 kg) |
| Recommended Wiring | 16 to 26 AWG twisted pair or shielded cable |
| Approvals | CE, RoHS2, WEEE, Reach |
| Warranty | 5-year limited |
| Country of Origin | Made in USA |
Specifications per the ACI WPR2 Wet to Wet Transmitter product data sheet and ACI Installation & Operation Instructions I0000756, Version 22.0. Verified October 2026.
Documentation
ACI WPR2 Wet to Wet Transmitter Product Data SheetACI WPR2 Installation & Operation Instructions (I0000756, Version 22.0)Installation Notes
- Order the model by maximum line pressure, not by differential pressure.
- Zero the unit before the sensors are installed, with no pressure applied to either sensor.
- Wire SENSOR HIGH and SENSOR LOW to their matching terminal blocks. Do not interchange or replace the sensors; they are calibrated to the unit and changes void the warranty.
- Mount the sensors on the top or side of the pipe, not underneath. Use a pigtail siphon to keep media below 257°F (125°C).
- Change range or output switches only with power off.
Frequently Asked Questions
Order by maximum line pressure, not differential pressure. The A/WPR2-100-40 is the WPR2-100 model, for systems with a maximum line pressure above 30 psi and up to 100 psi.
Four uni-directional ranges (0-100, 0-50, 0-25 and 0-10 psid) or four bi-directional ranges (+/-100, +/-50, +/-25 and +/-10 psid), selected by DIP switch with power off. It ships in uni-directional mode. In bi-directional mode, zero differential gives 50% of the output signal.
It outputs 2-wire 4-20 mA, or 3-wire 0-5 VDC, 0-10 VDC or 4-20 mA, and ships set to 0-10 VDC. Supply is 18-36 VDC or 24 VAC for 4-20 mA output (20-36 VDC at a 500 ohm load), and 16-36 VDC or 24 VAC for voltage output.
No. The high and low sensors are calibrated to the unit they ship with. Do not interchange them or substitute other sensors; changes to the sensors void the product warranty.
After the 15-minute warm-up, remove pressure from both sensors, then press ZERO or short the ZERO terminal to COM for 2 seconds.
Yes. The A/WPR2-100-40-LCD is the same transmitter and cable with an LCD showing high, low and differential pressure.
A 40-foot standard Type CMP plenum-rated PVC cable harness (UL Standard 444, NEC Article 800), with Packard connectors rated IP65 at the sensors.
- Series:
- WPR2
- Product Role:
- Wet/Wet Differential Pressure Transmitter
- Output Signal:
- 4-20 mA, 0-5V, 0-10V
- Pressure Range:
- 0-100 PSID
- Display:
- No Display
- Enclosure:
- NEMA 4X / IP66
- Cable Type:
- Standard PVC Cable
- Cable Length:
- 40 ft
- Wetted Material:
- 304L Stainless Steel
- Power Supply:
- 24 VAC/VDC
- Country of Origin:
- Made in USA
