Product Details：

Honeywell 30731823001 (30731823-001) is an A/D multiplex converter module designed for Honeywell legacy DCS control systems,its main purpose is multi-channel analog signal multiplexing and reliable analog-to-digital conversion for field transmitters. This module gathers multiple groups of 4-20mA analog signals coming from pressure,flow,temperature and level transmitters,realizes time-sharing channel switching through internal analog multiplexing circuit,converts the continuous analog quantity into digital data and transmits it to the main controller through the rack backplane bus. It solves the problem of limited analog input channel quantity of the main processor board,greatly expanding the analog acquisition capacity of the control rack without adding expensive independent AI modules. It adopts high-stability signal conditioning circuit for each channel,matches the impedance of field instruments and suppresses common-mode noise on long instrument cables,reducing measurement deviation caused by industrial ground loop interference. It supports cyclic sequential scanning of all configured channels,ensuring stable refresh rate of process values for closed-loop pressure,flow and temperature control loops. It can detect open circuit,short circuit and signal over-range abnormality of each analog channel,recording timestamped fault information and uploading alarm flags to the upper monitoring system for fault location and maintenance prompt. It is an obsolete legacy spare part,widely used for maintenance and retrofit of old Honeywell control racks in chemical and power plants.

Key specifications：Standard rack plug-in board structure,connects to control rack backplane bus. Multi-channel analog signal multiplex input,4-20mA signal range. Operating temperature range is 0°C to +60°C. It supports wire break,over-range and channel fault diagnosis. The PCB is conformal coated for dust and moisture resistance,and built-in EMC filter circuits reduce surge interference on field instrument lines. Edge connector and test points are reserved for channel injection testing and on-site calibration.

This A/D MUX module is widely deployed in petrochemical,chemical,power generation and water treatment plants for legacy DCS transformation and analog instrument centralized acquisition projects. It cooperates with Honeywell processor modules and communication interface modules to build multi-point analog signal acquisition architecture. As a core unit for ad multiplexer and analog scanning,it is the key expansion hardware for large-volume analog signal collection of old Honeywell control systems. Clearly defined channel terminals simplify field instrument wiring,loop calibration and periodic signal accuracy verification work for control engineers.