Gas Sensor Transmitter


Bacharach’s new GDX-150 Ammonia (NH3) Transmitter is the most economical solution for monitoring
and detecting increased levels of ammonia. Gas concentrations are quickly transmitted via 4-20 mA
current loop back to a centralized controller where concentrations can be displayed, alarms activated,
or exhaust fans turned on. The GDX-150 is a 2-wire sensor transmitter that accepts low power sensor
modules that are easily replaced in the field.

Features & Benefits

  • Simple 2-wire, 4-20 mA interface transmits signals thousands of feet
  • Improved noise immunity with stainless steel sensor head
  • Simple, non-obtrusive design
  • Robust, tamper-proof housing


Detection PrincipleElectrochemical, Field Replaceable
CoverageSingle Sensor = 40 Foot Diameter
Measuring Range0-500 ppm
Sensitivity1 ppm
Dimensions1.9” x 3.2” (4.83 cm x 8.13 cm)
HousingType 316 Stainless, Suitable for Class 1, Div 1&2, Gr. B,C,D ¾ Inch NPT Threading
CalibrationThrough GDA-400 or GDA-1600 Controllers
Response TimeT50 <30 s , T90 < 90s
4-20 Output Signal2-Wire, 4-20 mA Current Sink. Max Output = 25 mA
Long Term Drift<10% per 6 Months
Linearity<10% of Full Scale
Temperature Drift<0.1% per Degree C over Temperature Range
Operating Temperature Range-4 to 122oF (-20 to 50oC)
Ambient Humidity Range5% to 90% RH (Non-Condensing)
Power9 - 36 VDC, 250 mA (@ 24 VDC)
ApprovalsIntrinsically Safe with use of an IS Barrier

Ordering Information

Part NumberDescription
5600-1051GDX-150 Ammonia Transmitter


Part NumberDescription
5600-0004GDX Calibration Cup/Sample Draw Adaptor
5600-0003GDX Splash Guard/Remote Cal-Cup
0024-7059Calibration Kit – Regulator, Tubing and Carrying Case (no gas
0051-3160NH3 Calibration Gas, 25 ppm, 58 Liter
0051-7131Zero Grade Air, 103 Liter
5600-5003NH3 Replacement Sensor

*GDX-150 must be used in conjunction with Bacharach’s GDA-400 or GDA-1600 controllers for calibration and maintenance.