Technical Specifications:​ Input 4–20 mA DC sourcing or sinking; transmitter supply 18–32 V DC nominal 24 V DC; power consumption 3.25 W typical, 3.75 W for catalytic option; display 4-character digital plus 25-segment bar graph and message line; alarm relays A1, A2, A3 and fault relay rated 5 A at 250 V AC non-inductive; setpoint resolution 1% FSD; EEPROM configuration storage; form factor 3U Euro-rack, approximately 17 × 2.5 × 11.2 cm, 0.165 kg.

Functional Features:​ Front-panel reset and select for local alarm clearing and calibration; non-intrusive one-person calibration; field wiring open/short detection; inhibit mode for maintenance; A1/A2/A3 alarm levels with fault relay.

Application Scenarios:​ Refineries, offshore platforms, chemical plants, wastewater H2S/methane zones, power plant turbine halls and other hazardous gas monitoring areas.

Performance Parameters:​ Electronic drift less than ±2% over 6 months; output source current 500 mA maximum from field terminals; real-time concentration linearization and alarm comparison.

Material And Structure:​ Glass-epoxy PCB; plastic front bezel with LCD/LED window; 15-way D-sub field connector; 32-way backplane connector; gold-plated backplane contacts.

Working Principle:​ Receives 4–20 mA from the field detector, linearizes and scales the value to gas concentration, compares the result with EEPROM-stored A1/A2/A3 thresholds, drives alarm/fault relays, recorder output and front-panel display.

Installation Requirements:​ Mount in an EMI-shielded System 57 sub-rack slot; seat the backplane connector fully; wire the transmitter to the field connector; supply 18–32 V DC; configure gas type, range and alarm setpoints with the engineering/calibration menu.

Usage Notes:​ Use this 4–20 mA variant for standard analog transmitters; catalytic-bead dedicated variants are required where specified. Transfer EEPROM configuration with the engineering card when replacing. Ground the signal shield at one end only.