Bacharach GDX-150 Installation Instructions

GDX-150 Sensor Transmitter

Installation Instruction 5600-9000 

Rev. 2 – February 2011

1.  Overview 

These instructions describe how to wire the GDX-150 

transmitter to a Bacharach GDA-400 or GDA-1600 

controller. 

The GDX-150 is a sensor transmitter that provides a 

4-20 mA output signal based on the concentration of gas 

detected. The 4-20 mA interface is convenient for use 

with Bacharach’s GDA-400 and GDA-1600 controllers 

as well as other devices. 

Please review the GDA-400 manual (5700-9000) or the 

GDA-1600 manual (5700-9001) for a more detailed 

description of its 4-20 mA interface and for instructions 

on properly configuring the controller.  

Figure 1:  GDX-150 Ammonia Transmitter 

2.  Installation 

2.1. 

Items Required

  GDX-150 transmitter  

  GDA-400 or GDA-1600 controller with 4-20 mA input(s)  

2.2.  Installation Procedure  

1.  The GDX-150 has three wires exiting the rear of the housing (one green, two white). These wires 

should be connected to one channel of the controller’s 4-20 mA input module (5700-0014 for 

GDA-400; 5700-0006 for GDA-1600). The green wire is the ground wire and should be connected 

to the common terminal.  

2.  The white wires provide power to the transmitter and the 4-20 mA signal to the controller.  

Connect one of the wires to the power terminal and the other to the signal terminal.  

NOTE: The polarity of the two white wires is irrelevant.  

3.  Once all connections are made refer to the controller’s user manual for properly configuring the 

GDX-150 to operate with the controller.  

Figure 2:  Components of the GDX-150 

P/N: 5600-9000 Rev 2

1