Bacharach GDX-150 Owner's Manual

GDX-150 Sensor Transmitter

Installation Instruction 5600-9000

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)

Rev. 2 – February 2011

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

GDX-150 Sensor Transmitter

3. Specifications

Category Description

Product Type

GDX-150 transmitter for low level continuous monitoring of ammonia in
ambient environments

Coverage Single sensor, 40-foot diameter

Detector Type Electro-chemical, field replaceable

Sensitivity 1 ppm

Measuring Range 0-500 ppm

Accuracy ±15% of full scale, ±1 count (whichever is greater) of reading from 0-500 ppm

Long term Drift <10% per 6 months

Linearity <10% of full scale

Temperature Drift <0.1% per degree C over temperature range

Housing

316 stainless, suitable for Class 1, Div 1 and 2, Gr. B, C, D
¾ inch NPT threading

Calibration Through GDA-400 or GDA-1600 controllers

Response Time T50 <30 s , T90 <90s

4-20 output Signal 2-wire, 4-20 mA current sink. Max output = 25 mA

Operating Temp -20 – 50 °C (-4 - 122 °F)

Ambient Humidity 5% to 90% RH (non-condensing)

Power 9 – 36 VDC, 250 mA (@ 24 VDC)

Certification Intrinsically safe with use of an IS barrier

Warranty 2 years from date of shipment, consumables not included

4. Accessories and Replacement Parts

Part Number Description

5600-0004 Calibration Cup/Sample Draw Adaptor

5600-0003 Splash Guard/Remote Cal-Cup

0024-7059 Calibration Kit – Regulator, Tubing and Carrying Case (no gas included)

0051-3160 NH3 Calibration Gas, 25 ppm, 58 Liter

0051-7131 Zero Grade Air, 103 Liter

5600-5003 NH3 Replacement Sensor

Headquarters:

621 Hunt Valley Circle, New Kensington, PA 15068-7074

Toll Free: 800-736-4666 • Tel: [phone] • FAX: [phone]

Website: www.MyBacharach.com • E-mail: [e-mail]

2 P/N: 5600-9000 Rev 2