STS PTM/Ex Programmable Pressure Transmitter
Programmable pressure transmitter with 4–20 mA output and manufacturer Ex variant.
Original manufacturer: STS Sensoren Transmitter Systeme
Official Model Catalog
STS manufacturer technical data and certification downloads →
Check active product revision, measurement range, installation and certificates for the exact order code.
Ex / Hazardous-Area Document Check
Certificate source for PTM/Ex: STS publishes a PTM-series ATEX certificate and a separate IECEx Certificate PTM_Ex and PTM_N_Ex in its official download center. Exact PTM model and circuit compatibility must be checked against the certificate schedule.
Direct original model and approval: STS PTM/Ex datasheet and approval documents → · IECEx certificate SEV 19.0024X (PTM/Ex and PTM/N/Ex) →. Certificate coverage is configuration-specific; verify permitted operating temperature and electrical barrier parameters from the certificate schedule.
IECEx certificate schedule — PTM/Ex
Certificate: IECEx SEV 19.0024X (STS PTM/Ex), intrinsically safe Ex ia design. The certificate annex defines temperature classes separately: T6 Ta −25…+55°C (medium −25…+55°C); T4 Ta −25…+85°C (medium −25…+100°C); T3 Ta −25…+85°C (medium −25…+150°C). Maximum input values: Ui 30 V; Ii 140 mA; Pi 0.9 W. Intrinsic parameters include Ci 14 nF and Li 1.3 mH, plus the specified cable contribution. These values are not a substitute for verifying the installed device marking and approved barrier.
STS exact IECEx schedule cross-check — 22 October 2026
Model-specific certificate: IECEx SEV 19.0024X (issue 1, 23 September 2020) — official STS manufacturer-hosted IECEx certificate.
The official IECEx certificate explicitly covers STS PTM/Ex and PTM/N/Ex, but NOT PTM.MT maritime variants. Certified intrinsic safety requires the compatible entity/barrier parameters and exact model and connector configuration; the product photo does not establish a valid Ex installation.
STS PTM/Ex — software-adjustable range and documented Ex instrument class
| Model / specification | Official maker data | Implementation boundary |
|---|---|---|
| Pressure coverage | 100 mbar…1000 bar manufacturer family, ±0.25 or ±0.10% FS model accuracy | Nominal range set by order. Range adjustment is 1:4 within -5…+105% of nominal, not a 10,000:1 turndown. |
| Current loop | 4–20 mA measured pressure output; programmable zero and span via maker software | Do not infer generic Modbus output from the ability to configure digitally; barrier and loop burden must be selected. |
| Ambient/process temperatures | Operating -25…+85°C; process -40…+150°C | Electronics ambient and sensing-medium temperature are separate limits. |
| Media construction | Stainless steel or titanium material options | Select wetted medium/corrosion compatibility and connection before assuming use in chemicals. |
| ATEX/IECEx documentation | STS PTM/Ex lists ATEX/EAC and linked IECEx certificate | Only exact model label, Ex marking, barrier Ui/Ii/Pi and intrinsic safety certificate schedule can authorize hazardous-area design. |
Source and final unit approvals
Pressure accuracy in %FS is not % of reading. Explosion-protected PTM/Ex is a different orderable variant from ordinary PTM; confirm the actual supplied device/certificate and wiring barrier.
STS original model: STS PTM/Ex Programmable Pressure Transmitter. For any certified model, inspect the certificate schedule rather than extending family claims to other variants.