The Senva PW30W-C is a wet-to-wet differential pressure transmitter using dual remote PWT sensors at the high and low ports - one of the few wet/wet differential transmitters on the market that eliminates the traditional bypass-plumbing requirement by sensing differential digitally across two independently-mounted absolute sensors. The transmitter is housed in a PC/ABS (Plastic), NEMA 4X / IP65 enclosure with Conduit Connection (1/2 inch fitting, customer-supplied cable). Sensors connect to the transmitter via DIN43650 quick-disconnect - no wire twisting, no plumbing.
The PW30 outputs the standard PW30 selectable output: 2-wire 4-20 mA loop, 3-wire 0-5 VDC, or 3-wire 0-10 VDC (one DIP switch on the main board picks the mode). The on-board LCD shows the high port pressure, low port pressure, and computed differential pressure simultaneously - a meaningful step up from single-output diff-pressure transmitters where you can't see the absolute readings the BAS depends on. Remote sensors are NOT included with this SKU - order one or two PWT-series sensors (PWT050 / PWT100 / PWT250 / PWT500) separately based on the working pressure of the system. The PW30 transmitter pairs with any combination of PWT sensors and supports up to 16 selectable differential ranges from 1 to 500 PSID without re-ordering. Made in USA by Senva Inc. of Beaverton, Oregon.
Field-configurable installs where the wiring trade pulls customer-supplied cable through conduit, and the controls engineer specs the PWT sensor PSI rating later based on the as-built pressure of each loop. Order the matching PWT050 / PWT100 / PWT250 / PWT500 separately - one or two per transmitter depending on whether differential or absolute measurement is needed.
Key Features
One transmitter spans 1 PSID up to 500 PSID via DIP-switch range selection with the matching PWT sensor PSIG. Reduces SKU count on stocking shelves and lets controls engineers commission unknown-pressure loops without re-ordering a different transmitter mid-job.
Single DIP switch picks the output mode: 2-wire 4-20 mA loop-powered (15-30 VDC, 250 Ohm max), 3-wire 0-5 VDC (12-30 VDC or 24 VAC), or 3-wire 0-10 VDC (13-30 VDC or 24 VAC). 20 mA max. consumption.
Built-in LCD shows the high-port pressure, low-port pressure, and computed differential pressure simultaneously - meaningful upgrade over single-output diff-pressure transmitters that hide the absolute readings from the field tech.
PC/ABS plastic housing rated NEMA 4X / IP65 - washdown-rated, corrosion-resistant, and stable in chemically aggressive environments like cooling-tower decks and chiller plants where chlorinated water mist is unavoidable.
Customer-supplied cable through a 1/2 inch conduit fitting. Use for long cable runs over 100 ft where pre-fabricated cable doesn't make sense, or for installations following local electrical codes that require conduit on all signal cabling.
Each PWT sensor uses a micro-machined silicon strain-gauge transducer behind a 316L stainless steel diaphragm. Long-term stability: +/-0.25% FS per year. Pressure cycles: >100 million. Over-range protection: 200% rated pressure.
On-board DIP switches handle: range selection (16 differentials), uni/bi-directional mode, slow or fast response filtering, port swap (corrects field-wiring mistakes without re-plumbing), absolute mode, and test-mode output forcing for BAS commissioning.
Pushbutton zero re-zeros the transmitter in 5 seconds. Hold for 10 seconds to restore factory settings. Remote-zero terminal block input allows BAS-initiated re-zero on a schedule.
Integrated surge snubber protects the sensor from water-hammer transients - common cause of premature diff-pressure-sensor failure on pump-cycling loops. Adds significant service life on hydronic systems with variable-speed pumps.
Designed and manufactured by Senva Inc. in Beaverton, Oregon. RoHS and CE compliant. 7-year warranty on transmitter electronics, 2-year on the replaceable PWT sensor element.
Technical Specifications
| Specification | Value |
|---|---|
| Manufacturer | Senva Inc. |
| Manufacturer Part Number | PW30W-C |
| Series | PW30P (PW30 Wet-to-Wet Differential Pressure) |
| Sensor Type | Wet-to-Wet Differential (Dual Remote Strain-Gauge Sensors) |
| Sensing Element | Micro-Machined Silicon Strain Gauge (316L SS Diaphragm) |
| Differential Ranges | 16 selectable from 1 to 500 PSID (DIP-switch) |
| Output Signal (Switch-Selectable) | 2-wire 4-20 mA, 3-wire 0-5 VDC, or 3-wire 0-10 VDC |
| Power Supply (Voltage Mode) | 12-30 VDC or 24 VAC, 20 mA max |
| Power Supply (4-20 mA Mode) | 15-30 VDC (0 Ohm load) up to 18-30 VDC (500 Ohm), 20 mA max |
| Sensor Accuracy | <+/-0.25% BFSL (sensor element) |
| System Accuracy | +/-1% FS on 1%-class ranges; +/-2% FS on 2%-class ranges (see PW Accuracy Table) |
| Long-Term Stability | +/-0.25% FS per year |
| Over-Range Protection | 200% of rated sensor pressure |
| Pressure Cycles | >100 million |
| Transmitter Operating Temperature | -22 to 158 degF (-30 to 70 degC) |
| Media Compatibility | Water, other 316 SS-compatible liquids |
| Media Temperature | 32 to 250 degF (0 to 125 degC); steam requires siphon tube |
| Operating Humidity | 0 to 90% RH, non-condensing |
| Compensated Operating Range | 14 to 158 degF (-10 to 70 degC) |
| Vibration Rating | 10G peak, 20 to 2000 Hz |
| Zero Adjustment | Pushbutton (5s = re-zero, 10s = factory restore) + remote zero input |
| Configuration | DIP switches: range, test mode, uni/bi-directional, slow/fast response, port swap, absolute mode |
| Display | LCD - shows high port, low port, and differential pressure |
| Enclosure | PC/ABS (Plastic), NEMA 4X / IP65 |
| Cable Connection | Conduit Connection (1/2 inch fitting, customer-supplied cable) |
| Remote Sensor | Sensors Sold Separately (PWT series) |
| Sensor-to-Transmitter Connection | DIN43650 Form-A Quick-Disconnect |
| Process Connection (PWT Sensor) | 1/4 inch MNPT |
| PWT Conduit Fitting | 1/2 inch |
| Sensor Body Material | 304 Stainless Steel |
| Sensor Wetted Material | 316L Stainless Steel Diaphragm |
| Mounting Orientation | Unrestricted |
| Warranty | 7 years on transmitter electronics; 2 years on PWT replaceable element |
| Agency Compliance | CE, RoHS |
| Country of Origin | Made in USA - Senva Inc., Beaverton, Oregon |
Documentation
Required Sensors (Sold Separately)
This transmitter ships without sensors. Order 1 or 2 PWT remote sensors to complete the wet-to-wet differential install. Match the sensor PSIG rating to the working pressure of the system:
Use for working differential pressures up to 50 PSID. 1/4 inch MNPT, 316L SS diaphragm, DIN43650 plug-and-play.
View PWT050 »Use for working differential pressures up to 100 PSID. 1/4 inch MNPT, 316L SS diaphragm, DIN43650 plug-and-play.
View PWT100 »Use for working differential pressures up to 250 PSID. 1/4 inch MNPT, 316L SS diaphragm, DIN43650 plug-and-play.
View PWT250 »Use for working differential pressures up to 500 PSID. 1/4 inch MNPT, 316L SS diaphragm, DIN43650 plug-and-play.
View PWT500 »Frequently Asked Questions
16 selectable differential ranges from 1 PSID to 500 PSID, set via on-board DIP switches. The actual accuracy class (1% or 2%) depends on the PWT sensor PSIG rating selected for the install - see the PW Transmitter Accuracy table on the datasheet for the exact range/accuracy mapping per sensor.
No - that's the entire design intent of the PW30 series. Two remote PWT sensors mount directly to the high and low ports of the process pipe via 1/4 inch MNPT, and the transmitter computes differential pressure digitally. No bypass tee, no isolation valves required (manifold versions are still available for legacy process conventions).
One DIP switch on the transmitter board picks between 2-wire 4-20 mA loop, 3-wire 0-5 VDC, or 3-wire 0-10 VDC. Voltage modes accept 12-30 VDC or 24 VAC supply (13-30 VDC required for 10V FS). Current mode is loop-powered with 15-30 VDC at 0 Ohm load, up to 18-30 VDC at 500 Ohm.
PW30M uses a powder-coated steel enclosure rated NEMA 3R / IP65 - outdoor and drip-proof. PW30W uses PC/ABS plastic rated NEMA 4X / IP65 - washdown-rated and corrosion-resistant for chlorinated / chemical environments like cooling-tower decks. Identical internals and identical specs otherwise.
Match the PWT PSIG rating to the working pressure of your system. Common choices: PWT050 for small hydronic loops (under 50 PSID), PWT100 for typical pump-curve / filter monitoring, PWT250 for high-pressure chiller plant loops, PWT500 for fire-pump or industrial-process applications. Order two sensors for full differential, or one for absolute.
Yes - configure the transmitter in absolute mode and use a single PWT sensor on the high port. The LCD will show the absolute pressure on the active port and zero on the unused port; the differential reading equals the absolute reading. Useful when an existing 4-20 mA pressure input on the BAS needs a more accurate replacement sensor with no other infrastructure changes.
7 years on the transmitter electronics. 2 years on the replaceable PWT sensor element. The split warranty reflects the design philosophy - electronics never wear, but the sensor diaphragm sees full process exposure and is the field-replaceable component.
Designed and manufactured by Senva Inc. in Beaverton, Oregon, USA. RoHS and CE compliant.
- Brand:
- Senva
- Series:
- PW30W (Plastic NEMA 4X)
- Product Role:
- Wet-to-Wet Differential Pressure Transmitter
- Enclosure:
- Plastic NEMA 4X / IP65 (PC/ABS)
- Output Signal:
- Switch-Selectable: 4-20 mA / 0-5V / 0-10V
- Cable Connection:
- Conduit Connection (1/2 inch fitting)
- Bypass Manifold:
- None
- Sensor PSIG:
- Sensors Sold Separately (PWT050 / PWT100 / PWT250 / PWT500)
- Pressure Range:
- 1 to 500 PSID (16 selectable ranges via DIP switch)
- Display:
- LCD (High / Low / Differential simultaneous)
- Sensor Wetted Material:
- 316L Stainless Steel Diaphragm
- Country of Origin:
- Made in USA - BABAA / ARRA / TAA Compliant (Senva conformance list)
