SENVA PW31 Wet-Wet Differential Pressure Transmitter Installation Guide
- June 10, 2024
- SENVA
Table of Contents
PW31 Wet-Wet Differential Pressure Transmitter With 3 or 5 Valve Manifold
Installation Guide
IMPORTANT WARNINGS
- Only qualified trade installers should install this product
- This product is not intended for life-safety applications
- Do not install in hazardous or classified locations
- The installer is responsible for all applicable codes
- De-energize power supply prior to installation or service
PRODUCT APPLICATION LIMITATION:
Senva products are not designed for life or safety applications. Senva
products are not intended for use in critical applications such as nuclear
facilities, human implantable device or life support. Senva is not liable, in
whole or in part, for any claims or damages arising from such uses.
IMPORTANT!
- Do NOT exceed gauge pressure rating of sensor.
- Follow instructions step by step to ensure proper setup.
- Sensor will be damaged if reverse pressure is applied.
MOUNTING
The 3 and 5 valve assembly can be mounted using #6 to #8 pan head screws in
the four holes shown above (blue arrows). The assembly can also be mounted
with a 1/2” or smaller hose clamp (orange arrows).
DIMENSIONS
*Dimensions are the same for the 3 and 5 valve manifold.
5-VALVE OPERATION
5-Valve Manifold
| Manifold Material | Brass |
|---|---|
| Valve operation | V1 High pressure connection |
V2 Low pressure connection
V3 Pressure equalize
V4 For external gauge connection
V5 For external gauge connection
5 VALVE OPERATION:
- Close Valves V1, V2, V4, and V5 and open V3 to avoid hammering.
- Mount the Senva PW31 and install low and high pressure connections
- Slowly open V1, then V2.
- If external gauge is to be installed for the high pressure port, slowly open V4 to bleed the line. Allow the liquid to flow out until all air is out of the system. Then fully close the valve and install the pressure gauge. Slowly open V4.
- If external gauge is to be installed for the low pressure port, slowly open V5 to bleed the line. Allow the liquid to flow out until all air is out of the system. Then fully close the valve and install the pressure gauge. Slowly open V5.
- Slowly bleed the device, see “Bleeding” for correct operation.
- Close V3 for normal operation.
BLEEDING
To remove air from the connections and ensure accurate readings, bleed screws are provided on the high and low sides as shown below. Turn the screw slowly (1.5 times max) until liquid begins to flow. Allow the system to bleed out until there are no bubbles in the liquid. Then fully tighten bleed screw. Perform this operation on both the high and low side.
3-VALVE OPERATION
3-Valve Manifold
| Manifold Material | Brass |
|---|---|
| Valve operation | V1 High pressure connection |
V2 Low pressure connection
V3 pressure equalize
3 VALVE OPERATION:
- Close Values V1 and V2 and open V3 to avoid hammering.
- Mount the Senva PW31 and install low and high pressure connections.
- Slowly open V1, then V2.
- Bleed the device, see “Bleeding” for correct operation.
- Close V3 for normal operation.
ELECTRICAL
Senva recommends using 22AWG stranded, 4 conductor shielded cable to wire
between the PW31 transmitter and controller. Shielding should be connected to
the ground terminal at the transmitter end, and left unconnected at the sensor
end.
Terminals are rated for 24-14AWG, 3.5 lb-in of torque.
-
Run the cable through the connector body and connect the wires to the 4 terminals provided. Ensure that the wires are connected to the corresponding terminal label on the connector.
Connector Connection Wiringpin| 2-wiews| 3-wires
1| power +| power+
2| signal+| power+
3| null| signal+ - Assemble the adapter and tighten the assembly screw. Place the rubber cover on the adapter and plug the adapter onto the element.
SPECIFICATIONS
| Power supply | 15-35vdc, 20mA max. |
|---|---|
| Outputs | 2-wire 4-20mA, 3-wire 0-5v |
| Operating Temperature | Operating Temperature |
| Compensated range | -4 to 175° F (-20-80° C) |
30 to 158° F (0-70° C)
Media Compatibility| Transmitter Only| 316L SS compatible liquids and gases,
Fluororubber O-rings
Connection| Copper tube, CW614n Brass fittings (2.5-3.5% lead content)
Manifold O-Rings| Neoprene
Manifold Valves| Glass filled Acetal (Polyacetal Resin)
Manifold Material| Anodized Aluminum
Sensor Performance| Type| Micro-machined silicon strain gauge
Pressure Ranges| 0-5, 10, 25, 50, 100, 150 PSID
Overload Pressure (Differential)| 150% FS
Static Pressure| 500% FS
Accuracy(1)| ±0.25 %FS
Temp coefficient zero and span| <±0.03 %FSO
Long Term Stability| ±0.5 %FS/Year
Shock| 30G
Vibration| 10G peak, 20 to 2000 Hz.
Connection| Pressure Connection Transmitter only| 1/4” NPT Female
Pressure Connections Manifold| 1/4” NPT Female
Electrical Connection| DIN43650A
Environmental| IP65 (Installed with water-tight fittings) 1/2” conduit adapter
included
LED Display (optional)| Accuracy| 0.10%
Output| 4-20mA
Voltage Drop| <3.5VDC
Sample Rate| 4 times/second
Environmental| IP65
TROUBLESHOOTING
| Symptom | Solution |
|---|---|
| No output | Check wiring. Ensure power supply meets requirements. |
| Pressure reading error | Ensure all air is bleed from the system. |
CALIBRATION
Senva sensors are factory calibrated. No field calibration is necessary or
recommended.
DISPLAY DIMENSIONS
senvainc.com
1-866-660-8864
(F)1-503-296-2529
9290 SW Nimbus Ave.
Beaverton Oregon 97008
Revised 7/5/2022 Document #152-0411-0C