The Senva PW30M-015-A-250 is a wet-to-wet differential pressure transmitter using dual remote sensors to eliminate the bypass tubing, snubbers, and isolation valve assemblies that traditional flange-mount dP transmitters require. The remote sensors mount directly to pipe via 1/4 inch MNPT, and a DIN43650 plug-and-play connection eliminates wire twisting between the sensor and the transmitter head. This SKU ships with two PWT250 remote sensors (0-250 PSIG each) - one for the high-pressure leg, one for the low-pressure leg - factory-paired to the transmitter and ready to install.
The transmitter housing is Powder-Coated Steel (NEMA 3R) with an LCD display showing high, low, and differential pressures, and DIP switches for range selection (16 ranges), uni/bi-directional mode, fast/slow response, port swap, and test mode. Output is switch-selectable between 2-wire 4-20 mA loop-powered and 3-wire 0-5V / 0-10V on the same terminal block. Electrical connection on this SKU is 15-ft Pre-Wired Armored Cable. The integrated surge snubber protects the sensor element from water hammer for reliable long-term performance, and manual + remote zero push-button capability maintains accuracy across the service life.
Wet differential pressure measurement on systems where the dP falls within the PWT250 sensor's 0-250 PSIG operating range: HVAC pump-speed control and demand measurement; Filter dP and clog detection; Process pressure control on water, glycol, and 316L SS-compatible media; System leak detection; Data center wet-side pressure sensing. The remote-sensor architecture eliminates the cost and labor of bypass plumbing on existing installs.
This SKU ships with two PWT250 remote sensors as part of the assembly - one for the high-pressure leg, one for the low-pressure leg. Each sensor uses a 316L SS micro-machined silicon strain gauge with a 1/4 inch MNPT process connection and a 1/2 inch conduit fitting on the sensor body. DIP-selectable working ranges that the PWT250 pair supports on the transmitter: 0-30 / 0-40 / 0-50 PSID (2%); 0-75 / 0-100 / 0-125 / 0-150 / 0-250 PSID (1%). Both sensors connect to the transmitter via DIN43650 plug-in leads for plug-and-play installation.
Key Features
Dual sensors mount directly to pipe via 1/4 inch MNPT - no bypass tubing, no needle valves, no snubbers, no plumbing-trade dependency. Faster install, fewer leak points.
DIP switches let one device cover 1-500 PSID. Field-changeable without tools or a HART communicator. Re-range for a different application without re-ordering hardware.
Built-in LCD shows the high-side pressure, low-side pressure, AND the differential. Verification at a glance during balancing or commissioning, no DMM needed.
2-wire 4-20 mA loop-powered, 3-wire 0-5V, or 3-wire 0-10V on the same terminal block. DIP switch selects the mode at install time.
DIP switch reverses the high/low channel assignment in firmware, correcting plumbing errors without re-piping. Includes uni/bi-directional mode and absolute mode.
Surge protection on each sensor input shields the strain-gauge element from water hammer, extending service life on pump-controlled and valve-actuated systems.
Local push-button zero (5-second hold) and remote zero via terminal-block input. Hold for 10 seconds to restore factory defaults. Maintains accuracy across the service life.
Remote sensors come standard with DIN43650 plug-in connection - no wire twisting, no mis-wired polarity, faster swap-out for replacement or pressure-range change.
This SKU's housing is Powder-Coated Steel (NEMA 3R). Suitable for indoor and outdoor mechanical-room installation.
Transmitter electronics manufactured at Senva's Beaverton, OR facility. The transmitter itself (without a PWT remote sensor) qualifies for BABAA, TAA, and Buy America procurement.
Technical Specifications
| Specification | Value |
|---|---|
| Series | PW30 Remote Wet-to-Wet Differential Pressure Transmitter |
| Sensor Type | Micro-machined silicon strain gauge |
| Pressure Range | 16 DIP-selectable, 1-500 PSID (sensor dependent) |
| Output Signal | 2-wire 4-20 mA (loop-powered), 3-wire 0-5V, 3-wire 0-10V (switch-selectable) |
| Accuracy | +/-1% typ, +/-2% on lowest sub-range |
| Sensor Performance Accuracy | <+/-0.25% BFSL |
| Stability (1 year) | +/-0.25% FS typical |
| Over-range Protection | 200% rated pressure |
| Pressure Cycles | > 100 million |
| Compensated Operating Range | 14 to 158 degF (-10 to 70 degC) |
| Operating Temperature (Transmitter) | -22 to 158 degF (-30 to 70 degC) |
| Operating Humidity | 0 to 90% RH non-condensing |
| Media Temperature | 32 to 250 degF (0-125 degC); siphon tube required for steam |
| Media Compatibility | Water and other 316L SS-compatible media |
| Vibration | 10G peak, 20 to 2000 Hz |
| Power Supply (0-5V mode) | 12-30 VDC / 24 VAC, 20 mA max |
| Power Supply (0-10V mode) | 13-30 VDC / 24 VAC required for 10V FS output |
| Power Supply (4-20 mA mode) | 15-30 VDC (0 Ohm) / 16-30 VDC (250 Ohm) / 18-30 VDC (500 Ohm), 20 mA max |
| Power Consumption | 5 W max |
| Zero Adjustment | Automatic, push-button (5 sec re-zero, 10 sec factory restore), remote zero input |
| DIP Switch Functions | Range, test mode, uni/bi-directional, slow/fast response, port swap, absolute mode |
| Transmitter Enclosure | Powder-Coated Steel (NEMA 3R) |
| Transmitter Enclosure Rating | NEMA 3R / IP65 |
| Electrical Connection | 15-ft Pre-Wired Armored Cable |
| Bypass Manifold | None (optional service valve PWBV sold separately) |
| Remote Sensor | 2x PWT250 Remote Sensors Included (0-250 PSIG each) |
| Sensor Construction | 316L SS, 1/4 inch MNPT process, 1/2 inch conduit fitting |
| Sensor Connection to Transmitter | DIN43650 plug-and-play lead |
| Approvals | CE, RoHS, ISO |
| Country of Origin (Transmitter) | Made in USA - Beaverton, OR |
| Country of Origin (PWT Remote Sensor) | Imported |
| Warranty (Electronics) | 7 Years |
| Warranty (Replaceable Elements) | 2 Years |
| Manufacturer Part Number | PW30M-015-A-250 |
Selectable Differential Pressure Ranges
| Remote Sensor | 2% Accuracy Ranges | 1% Accuracy Ranges |
|---|---|---|
| PWT050 (0-50 PSIG) | 0-10 / 0-15 PSID | 0-20 / 0-25 / 0-30 / 0-40 / 0-50 PSID |
| PWT100 (0-100 PSIG) | 0-15 / 0-20 / 0-25 / 0-30 PSID | 0-40 / 0-50 / 0-75 / 0-100 PSID |
| PWT250 (0-250 PSIG) | 0-30 / 0-40 / 0-50 PSID | 0-75 / 0-100 / 0-125 / 0-150 / 0-250 PSID |
| PWT500 (0-500 PSIG) | 0-75 / 0-100 / 0-125 PSID | 0-150 / 0-250 / 0-500 PSID |
Note: Senva recommends not using an output range less than 10% of the sensor's total PSIG due to lower accuracy at the extreme low end. FS is defined as the full scale of the selected sub-range, including non-linearity, hysteresis, and repeatability.
Documentation
Frequently Asked Questions
This SKU ships with two PWT250 remote sensors with a 0-250 PSIG operating range each - one for the high-pressure leg and one for the low-pressure leg. Each sensor is 316L stainless steel with a 1/4 inch MNPT process connection and a DIN43650 lead that plugs into the transmitter. No additional sensor purchase is required - this is a complete differential pressure measurement system out of the box.
With two PWT250 sensors (0-250 PSIG), the maximum differential pressure this SKU can measure is 0-250 PSID. The transmitter offers 8 DIP-selectable sub-ranges within that cap: 0-30 / 0-40 / 0-50 PSID (2%); 0-75 / 0-100 / 0-125 / 0-150 / 0-250 PSID (1%). Senva recommends not using an output range less than 10% of the sensor's total PSIG rating.
The transmitter housing on this SKU is Powder-Coated Steel (NEMA 3R). The metal enclosure is rated NEMA 3R / IP65 and suits indoor mechanical-room and protected outdoor installations.
This SKU ships with a 15-ft pre-fabricated cable (armored for protection in cable-tray and exposed runs) factory-terminated at the transmitter. The free end is bare-wire ready for controller termination. No conduit-and-pull on the transmitter side.
Water and any liquid compatible with 316L stainless steel (316L is the wetted material of the PWT diaphragm). Glycols, treated condensate, and most HVAC hydronic fluids are compatible. Steam applications require a siphon tube to keep the sensor below its 250 degF media temperature limit.
A DIP switch on the transmitter board selects the output mode. The same terminal block is used for all three; the difference is the wiring topology (2-wire loop-powered for 4-20 mA, 3-wire for voltage). The transmitter ships configured for 4-20 mA from the factory unless ordered otherwise.
Pressurize both sensor ports equally (or use the bypass manifold if equipped) so the differential is true zero. Then press and hold the local zero button for 5 seconds - the LCD will indicate zero. To restore factory defaults, hold the button for 10 seconds. A remote zero input is also wired to the terminal block for panel-mounted or BAS-triggered re-zero.
No. The PW30 is a standard (non-hazardous) location transmitter. For Class I Division 1 or 2 areas, use the Dwyer / Omega 3100D explosion-proof DP transmitter family instead.
- Brand:
- Senva
- Series:
- PW30M
- Pressure Range Category:
- High (up to 250 psi)
- Output Signal:
- 4-20 mA, 0-5V, 0-10V
- Hazardous Location:
- Standard
- Display:
- LCD Display
- Enclosure:
- Metal (NEMA 3R)
- Bypass Manifold:
- None
- Cable Type:
- Armored Cable
- Power Supply:
- 12-30 VDC / 24 VAC
- Wetted Material:
- 316L Stainless Steel
- Country of Origin:
- Imported (mixed)
