Honeywell 51309218-125 Low Level Analog Mux Module for Sensor Signal Routing

The 51309218-125 low level analog mux module switches weak sensor signals into a shared acquisition channel. This unit handles millivolt-level inputs inside Honeywell process control systems. Engineers specify it for thermocouples and low-output transducers in continuous operations.

Physical Dimensions and Weight

The 51309218-125 presents a 178 mm faceplate height and a 40 mm faceplate width. Its circuit board reaches 160 mm in depth behind the front panel. The module weighs approximately 0.5 kg, which suits standard card cage installation.

Interface and Connectivity

This module accepts field wiring through a 16-point terminal block on the front edge. The 51309218-125 delivers multiplexed output through 1 backplane connection to the controller. Consequently, technicians can route 8 low level differential pairs into one acquisition path. Two LEDs indicate channel selection and module health on the faceplate.

Component Count and Build

Each 51309218-125 contains 8 low-thermal switch pairs, 1 multiplexer controller, and 16 field terminals. The board carries 4 configuration jumpers for channel mapping. Furthermore, 2 ejector levers simplify card removal during service.

Energy Storage and Power Parameters

The module draws 5 VDC and 12 VDC from the backplane supply rails. A 0.1 F capacitor stabilizes the analog reference during load changes. Therefore, the 51309218-125 holds measurement accuracy through brief supply fluctuations. The design includes no battery and stores no long-term energy.

Key Technical Parameters

Integration Notes

The 51309218-125 fits compatible slots within the Honeywell control card cage. Technicians map channels through the four configuration jumpers before wiring. Additionally, the low-thermal switch design limits offset errors in millivolt measurements.