GDX-350

Gas Sensor Transmitter/Monitor

Product Information

Bacharach’s all new state-of-the-art GDX-350 low temperature transmitters with B-Smart® technology
provide accurate detection of ammonia (NH₃) and carbon dioxide (CO₂). These full featured standalone
transmitters are designed to operate in extreme temperature conditions found in blast chillers and deep
freezers. GDX-350’s unique design includes programmable heaters for both the sensor and electronics
that are automatically activated when temperatures drop below user selectable temperatures. Placing
the sensors inside these harsh operating environments allow for quick detection and response to the
smallest leaks, protecting human life as well as product and machinery.

Features & Benefits

Non-Dispersive Infrared (NDIR) CO₂ detection range of 0-5%
Electrochemical sensors for detecting 0-500 ppm of Ammonia
Heated sensors and electronics for low temperature operation (-55 degrees Celsius)
Graphic LCD for real time monitoring of concentrations
4-20 mA and optional Modbus^® RTU interface
30 minute onboard data trend
B-Smart^® sensor program
Optional Relay outputs

B-Smart^® Sensors

The B-Smart^® Sensor Exchange Program allows users to replace pre-calibrated sensors in the field, eliminating the need to send it in for calibration. With the B-Smart^® Sensor Program, you receive factory-calibrated sensors, just plug them in and continue to use your instrument – there’s no down time and it saves time and money.

Specifications

Detection Principle	Infrared, Field Replaceable (CO₂), Electrochemical (NH₃)
Measuring Range	CO₂: 0 - 5%, in .1% Increments NH₃: 0-500 ppm, in 1 ppm Increments
Dimensions	8.0” x 5.5” x 4.61” (20.32 cm x 13.97 cm x 11.709 cm)
Housing	Durable Aluminum Enclosure Suitable for Class 1, Div 1&2, Gr. B,C,D
Front Panel	5 Indicator Lights; AL1, AL2, Fail, In Cal and RS-485
User Interface	64 x 128 Pixel LCD Graphic Display for Gas Readings, 30 Minute Trend, Bar Graphing, Engineering Units and Backlight
Operating Temperature Range	-67 to 140°F (-55 to 60°C)
Ambient Humidity Range	5% to 90% RH Non-Condensing
Response Time	CO₂: T50 <15 s , T90 < 30s NH₃: T50 <30 s , T90 < 90s
Security Mode	Lock Out Critical Parameters
4-20 Output Signal	3-Wire, 4-20 mA. Max Loop Resistance is 750 ohms (@24 VDC)
Alarm Relays	Three 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 Loss of Power to GDX-350 will be Indicated as a “FAULT” Condition.
Communications	RS-485, Modbus^®
Power	10 - 30 VDC, 250 mA (@ 24 VDC)
Power Safety Mode	Fully Automatic System Reset – All Programmed Parameters Retained
Approvals	CSA: Division 1 & 2, Class 1 Groups B,C,D (for CO₂ only) ATEX: CE Mark, EExd IIB + H2, T5 (for CO₂ only)

Ordering Information

Part Number	Description
5600-3224	GDX-350 CO₂ Transmitter with Relays and Modbus^® RTU Interface
5600-3223	GDX-350 CO₂ Transmitter without Relays and Modbus^® RTU Interface
5600-3054	GDX-350 NH₃ Transmitter with Relays and Modbus^® RTU Interface
5600-3053	GDX-350 NH₃ Transmitter without Relays and Modbus^® RTU Interface

Replacement Parts & Accessories

Part Number	Description
5600-0004	GDX Calibration Cup/Sample Draw Adaptor
5600-0003	GDX 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
0054-0605	CO₂ Calibration Gas, 2.0%Vol, 103 Liter
0051-7131	Zero Grade Air, 103 Liter
5600-5002	CO₂ Replacement Sensor
5600-5003	NH₃ Replacement Sensor
5600-6000	GDX-350 B-Smart^® CO₂ Sensor, Pre-Calibrated
5600-6001	GDX-350 B-Smart^® NH₃ Sensor, Pre-Calibrated
5600-8000	GDX-350 B-Smart^® CO₂ Sensor (2-year program/sensors replaced every 12 months)
5600-8001	GDX-350 B-Smart^® NH₃ Sensors (2-year program/sensors replaced every 6 months)