Hach SI792 Transmitter

Core Performance & Industrial Application

The Hach SI792 is a rugged 2-wire transmitter for online pH, ORP, conductivity or dissolved oxygen measurement in water and process analysis.

4-20 mA floating analog output with standard HART; optional FOUNDATION Fieldbus H1 / PROFIBUS PA; self-diagnostics monitor asymmetry, slope, response time, cable integrity, glass and reference impedance.

Supply 12-30 VDC (≤100 mA, 0.8 W Ex); ATEX Zone 1 hazardous-area certified; FM Class I Div 2.

It converts analog electrochemical sensor signals into control-room readable loops as spare replacement (replaced by SC4500).

Technical Specifications

▶ Product type: 2-wire electrochemical transmitter

▶ Brand: Hach

▶ Model: SI792 (E/T/D/FF/PA variants)

▶ Measurement: pH, ORP, conductivity, dissolved oxygen

▶ Output: 1× 4-20 mA floating; HART standard; FF H1 / Profibus PA optional

▶ Supply: 12-30 VDC; ≤100 mA; 0.8 W max (Ex); FISCO/linear barrier compatible

▶ Diagnostics: Slope, asymmetry, response time, cable/glass/reference impedance

▶ Protection: ATEX Zone 1; FM Class I Div 2; local LCD

▶ Feature: Sensor health monitoring, HART config, loop-powered

▶ Note: Sensor type, protocol and variant suffix confirmed from nameplate before ordering

▶ Country of origin: USA

▶ Compliance: CE, ATEX, FM certification

Industry Applications

Applied in water treatment, chemical and refining pH/ORP/conductivity/DO online analyzer loop spare replacement.

Note: Confirm sensor type, communication protocol and variant suffix against nameplate before ordering