Precision Liquid Level Pressure Transmitter (RS PMLG150)

RS PMLG150 series

RS PMLG150 is a compact submersible liquid level transmitter with MEMS piezoresistive sensing and fault diagnostics. Its modular, welded design supports water-level measurement in applications compatible with the wetted materials.

Digital compensation and calibration control measurement errors over the specified temperature band. EMI protection supports use in electrically noisy environments.

Full-scale level ranges run from 1 to 150 mH₂O, with ratiometric voltage, absolute voltage or 4–20 mA outputs. TEB and compensation bands depend on the selected level range, as shown below.

Features & Applications:

The RS PMLG150 is a fully sealed submersible smart liquid level transmitter built with an all-SUS316L stainless steel welded structure. It uses a high-performance, highly reliable piezoresistive pressure sensor made by Rodee Sensors and is manufactured with digital compensation and calibration, delivering high-accuracy level measurement across the full temperature range.

The cable is a high-quality waterproof cable with an air vent, connected to the stainless steel housing by a dual-sealing design to ensure long-term reliability when submerged. The 4-20 mA output version works on a two-wire loop. Thanks to its modular design, the product is compact, light, easy to install and reliable in use.

Product Highlights:

  • High accuracy with digital compensation and calibration
  • Dual sealing design for long-term stable and reliable operation
  • Compact and anti-clogging design
  • Fault diagnosis function
  • Enhanced EMI / EMC protection design
  • The 4–20 mA version uses a two-wire loop; match voltage-output supplies to the table below.

View datasheet (PDF) · Download PDF

Slim stainless steel cylindrical submersible level probe with black cable on top

Specifications

ParameterSpecification and conditions
SeriesRS PMLG150 submersible liquid level transmitter
Full-scale level ranges1 to 150 mH₂O; select the ordering range
Signal output0.5–4.5 V ratiometric; 0–5 / 1–5 V and 0–10 / 1–10 V absolute voltage; 4–20 mA
TEB (full scale ≤3 mH₂O)At 0 to 50 °C: typical ≤±0.25% FS, maximum ≤±0.50% FS
TEB (3<full scale≤10 mH₂O)At 0 to 60 °C: typical ≤±0.20% FS, maximum ≤±0.25% FS
TEB (full scale >10 mH₂O)At −10 to 70 °C: typical ≤±0.15% FS, maximum ≤±0.25% FS
Ambient operating temperatureFull scale ≤3 mH₂O: −10 to 70 °C; 3<full scale≤10 mH₂O: −20 to 80 °C; >10 mH₂O: −40 to 105 °C
Media and storage temperature−40 to 105 °C; check ambient conditions against the selected range above
Supply0.5–4.5 V output: 5.0 VDC ±5%; other listed voltage outputs: 21–30 VDC; 4–20 mA: 10–32 VDC (24 VDC recommended)
4–20 mA wiring and loadTwo-wire loop; RL≤(SV−10 V)/0.022 A, including the entire measurement loop
Construction and wetted materialWelded SUS316L seal, anti-clogging structure, vented cable and dual-sealing design
CableSelect length for installation depth and routing; match sheath material to the medium and environment
Datasheet version2026-04-23, 5 pages