STS PTM/N Programmable Submersible Level Transmitter
Programmable pressure-based level transmitter with 4–20 mA output and selectable spans; stainless-steel and titanium variants. The standard PTM/N designation does not by itself imply PTM/N/Ex or maritime PTM.MT/N/Ex certifications.
Original manufacturer model documentation
PTM/N official product page and downloadable datasheets.
Order-code and hazardous-area check: Exact pressure span, materials, connector and electrical output depend on the ordered version. Do not treat standard and /Ex model suffixes or certification annexes as interchangeable.
PTM/N — programmable level loop
Analog-loop configuration: The PTM/N is a programmable, submersible pressure-based level transmitter with a 4–20 mA output. The transmitter’s configured lower/upper pressure values should match the receiving PLC/display scale, with below-range or loop-break faults handled explicitly.
Hydrostatic installation: Confirm process density and pressure reference when converting pressure into water level; document probe elevation and cable entry/vent protection. Stainless-steel versus titanium wetted construction should be chosen for actual chemical exposure, not solely the product family label.
Model-family boundaries: PTM/N/RS485 and PTM/N/SDI-12 have different digital interface requirements; PTM/N/Ex and PTM.MT/N/Ex carry distinct certification scopes. The standard PTM/N name alone proves none of those features.
PTM/N — use the submersible model datasheet
| Selection point | Model-specific evidence |
|---|---|
| Specific source | PTM/N programmable 4–20 mA sheet, release 10.80.0545.A (June 2019). |
| Level range and accuracy | 1–250 mH₂O; ≤±0.25% FS for 1–5 mH₂O and ≤±0.10% above 5 mH₂O in the technical table. |
| Electrical | 9–33 VDC; 4–20 mA; 0.025% FS resolution. |
| Scaling/filter | Endpoints −5…105% FS; span 25…110% FS, ≥1 mH₂O; 0.1/1/10/30 Hz low-pass options. |
| Thermal/cable | −5…80°C operating and process; above 50°C select PE or FEP cable. |
The linked HTML overview lists a much broader pressure range, voltage outputs and temperature limits that conflict with this submersible sheet. Do not combine them into one specification. The values above describe the identified PDF revision; obtain the matching current order sheet. Filter choice trades response speed against noise, and fluid density must be included when converting head to level.
STS model documentation · Revision-specific manufacturer datasheet. Technical source review: 26 October 2026.