Bacharach GDX-350 Specifications

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Features & Benefits:

Pre-calibrated Smart Sensor capability with 'plug-n-play'
convenience minimizes maintenance and downtime

Non-Dispersive Infrared (NDIR), Catalytic Bead and
Electrochemical sensor options available

Can be placed directly in hazardous environments where
leaks occur for quick detection and rapid response

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Graphic LCD for real-time monitoring of concentrations

4-20 mA, optional Modbus RTU® and wireless interface

Easily update alarm set points, configurations or
maintenance modes using the LCD display

30-minute onboard data trend

Standalone Operation in Harsh Environments

Bacharach's new state-of-the-art GDX-350 transmitters, with Smart Sensor technology, provide accurate and
continuous detection of toxic, combustible and asphyxiate gases. The full-featured design of the GDX-350
includes a large LCD display, a 4-20 mA interface, programmable alarms, optional relays and a Modbus interface.
Exclusive pre-calibrated replacement sensor technology makes occasional maintenance practically effortless.
Rugged construction, intrinsic safety capability (in two-wire mode with barrier) and an explosion-proof housing
allow the GDX-350 to operate directly in hazardous-rated areas of many industrial environments, delivering
reliable, superior-sensing performance to protect human life, equipment and property.

With its large LCD display, the GDX-350 shows gas concentrations, engineering units and bar graphs along with
the most recent 30 minutes of trend data. Utilizing the on-board magnetic keypad, users can also navigate
through the display to change alarm set points, instrument configurations, or enter into maintenance mode for
non-intrusive sensor calibration. For security, menu options also enable the selection of an authorization code to
lock critical parameters. Accompanying the LCD display are standard LED alarm indicators that show when low
and high alarm conditions are met. An optional relay board is available to provide three 5-amp relays that can be
used to drive audible/visual alarms, or activate exhaust fans.

1 - 800- 736- 4666 | 724- 334- 5000 | www.MyBacharach.com | help@M y Bach a r ach.c o m

GDX-350 Product Specifications

Gas Type Measuring Range Display Increments Sensor Type

Ammonia (NH3)
Carbon Dioxide (CO2)
Carbon Monoxide (CO)
Hydrogen (H2)
Hydrogen Sulfide (H2S)
Hydrocarbon (CH4)
Methane (CH4)
Nitrogen Dioxide (NO2)
Oxygen (O2)
Phosphine (PH3)
Propane (C3H8)
Sulfur Dioxide (SO2)

0 - 500 ppm
0 - 5% vol
0 -1,000 ppm
0 - 1,000 ppm
0 - 500 ppm
0 - 100% LEL
0 - 100% LEL
0 - 99.9 ppm
0 - 25%
0 - 5 ppm
0 - 100% LEL
0 - 99.9 ppm

1 ppm

0.1%
1 ppm
1 ppm
1 ppm
1%
1%

0.1 ppm

0.1%

0.01 ppm
1%

0.1 ppm

Electrochemical
Infrared (NDIR)
Electrochemical
Electrochemical
Electrochemical
Infrared (NDIR)
Catalytic Bead
Electrochemical
Electrochemical
Electrochemical
Infrared (NDIR)
Electrochemical

Default Span Point Default Low Alarm Default High Alarm

25 ppm

2.5%
100 ppm
100 ppm
25 ppm
25% LEL
25% LEL

5.0 ppm

20.9%

1.00 ppm
25% LEL

5.0 ppm

25 ppm

1.5%
35 ppm
50 ppm
10 ppm
10% LEL
10% LEL

1.0 ppm

19.5%

0.30 ppm
10% LEL

2.0 ppm

50 ppm

2.5%
70 ppm
100 ppm
20 ppm
20% LEL
20% LEL

2.0 ppm

18.5%

0.60 ppm
20% LEL

4.0 ppm

Response Time (T90)

<75 s
<50 s
<50 s
<180 s
<75 s
<60 s
<45 s
<75 s
<30 s
<60 s
<60 s
<45 s

Dimensions:

Housing:

Front Panel:

User Interface:
Operating Temperature Range:
Ambient Humidity Range:

Security Mode:

4-20 mA Output Signal:

Alarm Relays:

8.0” x 5.5” x 4.61” (20.32 cm x 13.97 cm x 11.71 cm)
Durable Aluminum Enclosure - Suitable for Class 1, Div. 1 & 2, Groups B, C, D
5 Indicator Lights: Alarm 1, Alarm 2, Fail, In Calibration, and RS-485
64 x 128 Pixel LCD Graphic Display for Gas Readings, 30 Minute Trend, Bar Graphing, Engineering Units and Backlight

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40°F to 140°F (-40°C to 60°C)
5% - 90% RH Non-Condensing
Lock Out Critical Parameters
3-wire, 4-20 mA. Max Loop Resistance is 750 Ω (@24 VDC)
3 Configurable Form C (SPDT) Relays rated for 5 amp at 30 VDC or 240 ~ VAC RESISTIVE. | Relay 1 and Relay 2 Level Alarms are

configurable for HIGH or LOW Trip, for Normally Energized (Failsafe) or Normally De-Energized and for Latching or Non-Latching.
Relay 3 is always Normally Energized for Failsafe Operation so any loss of power to the GDX-350 will be indicated as a “FAULT” condition.

Communications:

Power:

Power Safety Mode:

Approvals:

RS-485, Modbus
10 - 30 VDC, 250 mA (@ 24 VDC)
Fully automatic system reset. All program parameters are retained.
CSA: Division 1 & 2, Class 1: Groups B, C, D (excludes NH3)

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GDX-350 Ordering Information - Common Configurations*

5600-3011 GDX-350 [CO] 0-1,000 ppm, 3-wire
5600-3021 GDX-350 [H2S] 0-500 ppm, 3-wire
5600-3031 GDX-350 [O2] 0-25%, 3-wire
5600-3041 GDX-350 [NO2] 0-100 ppm, 3-wire
5600-3051 GDX-350 [NH3] 0-500 ppm, 3-wire
5600-3061 GDX-350 [SO2] 0-100 ppm, 3-wire
5600-3071 GDX-350 [PH3] 0-5 ppm, 3-wire
5600-3201 GDX-350 [CH4] 0-100% LEL, Cat. Bead, 3-wire
5600-3211 GDX-350 [CH4] 0-100% LEL, IR, 3-wire
5600-3221 GDX-350 [CO2] 0-5% Vol., IR, 3-wire

*Customized sensor configurations are available based on your specific needs. Ask your authorized Bacharach representative for details.

5600-3231 GDX-350 [Propane] 0-100% LEL, IR, 3-wire
5600-3241 GDX-350 [Pentane] 0-100% LEL, Cat. Bead, 3-wire
5600-3012 GDX-350 [CO] 0-1,000 ppm, 3-wire - with Relays and Modbus
5600-3022 GDX-350 [H2S] 0-500 ppm, 3-wire - with Relays and Modbus
5600-3032 GDX-350 [O2] 0-25%, 3-wire - with Relays and Modbus
5600-3042 GDX-350 [NO2] 0-100 ppm, 3-wire - with Relays and Modbus
5600-3052 GDX-350 [NH3] 0-500 ppm, 3-wire - with Relays and Modbus
5600-3202 GDX-350 [CH4]

0-100% LEL, Cat. Bead, 3-wire - with Relays and Modbus

5600-3212 GDX-350 [CH4] 0-100% LEL, IR, 3-wire - with Relays and Modbus
5600-3222 GDX-350 [CO2] 0-5% Vol., IR, 3-wire - with Relays and Modbus

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GDX-350 Accessories & Replacement Parts

5600-6010 GDX-350 Smart CO Sensor, Pre-Calibrated Replacement
5600-6020 GDX-350 Smart H2S Sensor, Pre-Calibrated Replacement
5600-6030 GDX-350 Smart O2 Sensor, Pre-Calibrated Replacement
5600-6040 GDX-350 Smart NO2 Sensor, Pre-Calibrated Replacement
5600-6050 GDX-350 Smart NH3 Sensor, Pre-Calibrated Replacement
5600-6060 GDX-350 Smart SO2 Sensor, Pre-Calibrated Replacement
5600-6070 GDX-350 Smart PH3 Sensor, Pre-Calibrated Replacement
5600-6110 GDX-350 Smart H2 Sensor, Pre-Calibrated Replacement
5600-6200 GDX-350 Smart CH4 Sensor (Cat. Bead), Pre-Calibrated Replacement
5600-6210 GDX-350 Smart CH4 Sensor (IR), Pre-Calibrated Replacement
5600-6220 GDX-350 Smart CO2 Sensor, Pre-Calibrated Replacement
5600-6330 GDX-350 Smart Propane Sensor (IR), Pre-Calibrated Replacement

Replacement sensors can be set-up on a pre-determined delivery schedule for additional convenience.

BACHARACH IS A U.S.
BASED MANUFACTURER

©2014, Bacharach, Inc., all rights reserved. All information is subject to verification.

June 2014 - REV. 3 Printed in U.S.A.

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