Huba Control Type 712 Hydrostatic Level Transmitter
Calibrated submersible hydrostatic level transmitter with relative or absolute measurement and optional temperature channel. Manufacturer supplies 2–30 m cable variants for water, heating oil and compatible fluids.
Manufacturer model specifications
Relative pressure 0–2.5 bar; absolute 0–3 bar. Response <2 ms; ambient and fluid temperature −20 to +80°C (non-freezing). AISI 316L housing, ceramic Al₂O₃ measuring element and IP68 rating when installed to the manufacturer's immersion conditions. Analog current, voltage and ratiometric variants.
Certification and model-variant restrictions
Selected 712 variants are certified ATEX II 1 G Ex ia IIC T4 Ga under SEV 12 ATEX 0138 and IECEx Ex ia IIC T4 GaX under IECEx SEV 12.0006; the manufacturer’s page also lists some UL Class I Division 1 or Zone 0 variants. Exact cable, signal, entity parameters and certified configuration must be matched to a current certificate annex; do not infer that all 712 order codes are Ex-certified.
Original technical source
Huba Control official Type 712 model page and technical downloads · Manufacturer datasheet PDF.
Type 712 — voltage and current output variants
| Model selection parameter | Manufacturer-specific evidence |
|---|---|
| Two-wire current output | 4–20 mA; 10–30 VDC, loop burden defined by available supply above 10 V; verify cable length and loop voltage drop. |
| Three-wire voltage output | 0–10 V; 12–30 VDC. Ratiometric 10–90% requires 5 VDC ±10% and the matching high-input-impedance receiver. |
| Optional combined temperature | Temperature-capable ratiometric version uses a separate connection arrangement; not all Type 712 devices measure temperature. |
| Pressure/materials | Calibrated submersible probe; ceramic Al₂O₃ cell, 316L housing, PE-HD cable. EPDM option is relevant to drinking water; compatibility of all wetted materials must be checked. |
| Measurement performance | Standard maximum deviation ±0.8% FS at 25°C; special higher-accuracy ±0.5% FS is explicitly restricted to qualifying ratiometric/range variants. |
Match order number, pressure reference (relative vs. absolute), vented-cable moisture protection and target depth. Ex ia approval belongs only to properly certified combinations and must not be extrapolated to the entire product family. The 2–30 m cable selection and IP68 conditions must be assessed together.
Huba Control Type 712 official model and approvals (manufacturer reference; reviewed 26 October 2026).