null Skip to main content
Differential Pressure Transmitters - Wet

Differential Pressure Transmitters - Wet

Wet/wet differential pressure transmitters measure the pressure difference between two liquid-filled ports and output a standard signal — 4-20 mA, 0-5 / 0-10 VDC, or millivolt — proportional to that difference. With 316L stainless steel wetted parts, they handle water, oils, and many chemicals that dry/air sensors cannot. Use them for liquid flow, filter and strainer monitoring, pump differential, hydronic and chilled-water systems, and process control. ZOT stocks Omega, Senva, Belimo, and Siemens wet differential models from 0-10 inH₂O up to 0-1000 psid.

Choosing the Right Transmitter — Three Specs to Lock
1

Pressure Range

Low DP: 0-10 inH₂O to 0-5 psid for filter and low-flow monitoring Mid range: 0-15 to 0-150 psid for pump and hydronic duty High range: 0-250 to 0-1000 psid for process and high-line systems Metric: bar and mbar ranges available on Omega models

2

Output Signal

4-20 mA: long wire runs, noisy plants, retrofit loops 0-10 / 0-5 VDC: modern DDC and short-run controller inputs 10 mV/V: ratiometric output for strain-meter and OEM inputs Digital USB: direct configuration and logging on select Omega units

3

Connection & Build

Wetted parts: 316L SS (Omega, Senva); SS + ceramic (Belimo) Process connection: 1/4 in NPT or 1/4 in BSPP (G1/4) male Termination: cable, mini-DIN, M12, or twist-lock Accuracy: Omega 0.08% BSL; Senva adds LCD and a 7-year warranty

Tip: Use the filters on the left to narrow by brand, series, pressure range, output signal, accuracy, process connection, and electrical termination. Measuring a liquid line against a dry or vented reference instead of two wet ports? See the Differential Pressure Transmitters - Dry category.
!