STS ATM.1ST/N/Ex High Precision Level Transmitter
High-precision submersible level transmitter for applications requiring ATEX/IECEx certification. Pressure range, accuracy, materials and electrical barrier depend on the exact order code. Do not infer identical approvals to the standard ATM/N/Ex family.
Manufacturer documentation and verification
Official ATM.1ST/N/Ex product page and technical downloads →
Product-level QA: This entry documents the verified manufacturer family, not every current SKU. Orderable electrical and mechanical variants, exact certificate schedule and a manufacturer-source model photograph remain subject to individual review. Never treat a family name as universal hazardous-area approval.
Verified performance and approvals
Manufacturer specifications: 0.5–250 mH₂O measuring span; selectable accuracy ±0.10% or ±0.05% FS; 4–20 mA output; stainless steel or titanium construction; operating temperature −5 to +80°C. The original STS datasheet identifies ATEX and IECEx certificates for this model family, but permitted hazardous-area zone and temperature class depend on exact wiring, connection and ordered temperature variant.
Order-code restrictions: Lloyd’s Register certificate LR2687601TA (issued 15 April 2026; expires 17 November 2030) lists the ATM.1ST/N/Ex code structure, including T6 at ambient −5 to +50°C and T4 at −5 to +80°C. This is a marine type-approval certificate, not a substitute for the ATEX or IECEx certificate. Consult STS’s separate explosion-protection certificates and installation instructions.
Manufacturer datasheet (PDF) · Marine type approval and order-code schedule (PDF) · Official Ex certificate download center
Manufacturer-verified technical facts
Manufacturer specifications: 0.5–250 mH₂O range; selectable ±0.10% / ±0.05% FS accuracy; −5 to +80°C operating temperature; 4–20 mA output; stainless steel or titanium. STS lists ATEX and IECEx documents. Exact order-code safety parameters require certificate schedule and installation instructions.
Manufacturer catalog and certificates
Verified IECEx certificate scope
ATM.1ST/N/Ex — IECEx SEV 10.0003X, issue 3 (24 January 2018). The official IECEx schedule covers ATM.1ST/N/Ex submersible level transmitters explicitly. This is not the same model group as PTM.MT/N/Ex. Pressure range 0.5–250 mH₂O, accuracy options down to 0.05% FS, 4–20 mA. Exact permitted T-class and cable/connector, titanium handling and connected barrier must follow the certificate annex and manufacturer safety instructions.
Official IECEx schedule covering ATM.1ST/N/Ex · Installation safety instructions.
ATM.1ST/N/Ex — accuracy over temperature
| Selection point | Model-specific evidence |
|---|---|
| Nominal head ranges | 0–0.5 to 0–250 mH₂O, selected at order. |
| Static accuracy | ≤±0.10% or ±0.05% FS, configuration-dependent. |
| Total error band | ≤±0.15% FS over −5…50°C; distinguish this from static accuracy. |
| Operating/process range | −5…80°C in the overview; certified temperature class remains order-specific. |
| Output and wetted construction | 4–20 mA; stainless steel or titanium. |
For a 10 mH₂O full-scale instrument, 0.05% FS corresponds to 0.005 mH₂O, whereas 0.15% FS corresponds to 0.015 mH₂O. These are arithmetic examples, not additional factory guarantees. Fluid density, installation height and pressure-reference handling add system uncertainty; use the total-error specification when temperature varies.
STS model documentation. Technical source review: 26 October 2026.