Baruch Ammonia (NH3) Gas Detectors for Industrial Applications

Fixed type NH3 gas detector is used to monitor the ammonia concentration with optional range of 0 - 50ppm, 0-100ppm, 0-200ppm in different kinds of fields such as refrigerated space, liquid ammonia tank storage area, laboratory, livestock farm, sewage treatment plant, denitrification chemical industry, etc.


  • Adopting high precision sensor for accurate gas leak detection.
  • Equipped with 3-wire system 4-20mA analog output, relay output, RS485 output (optional).
  • Compatible with various controlled alarms, PLC, DCS and other control system, and can be remote monitored.
  • Explosion-proof design, fast, relaible and stable.
  • Infrared ray controller can remote control the alarm point settings, zero calibration, and address modification.
  • Two-stage alarm with sound and light, and the alarm point is settable.
  • With self-calibration function, and three standard keys will be used to realize on-site maintenance.
  • Can output one or two on-off signals, can drive ventilator, solenoid valve or other external devices.
single gas detectors


Detection PrincipleElectrochemistry
GasAmmonia (NH3)
Range (Optional)0 to 50 ppm, 0 to 100 ppm, 0 to 200 ppm, 0 to 500 ppm
Resolution0.01ppm, 0.1ppm (related to the selected range)
Accuracy≤±3% F.S.
Responce Time≤10s
Recovery Time≤10s
Linearity Error≤±1%
Zero Shift≤±1% (F.S./year)
Signal Output (Optional) Note4-20mA, or RS485 (transfer card included); Relay output: one group of relay output (1NO+1NC, 24V 100mA) for one alarm (default), or two groups of relay output (2NO+2NC, 24V 100mA) for high/low alarm (optional).
AlarmsSound, light
DisplayHigh light nixie tube display
InstallationWall-mounted, piping type, flow-type (according to the detected environment)
ConnectionG1/2 male thread explosion-proof flexible pipe
Operating Time24h
Explosion-proof GradeEx d llC T6
Protection GradeIP65
CertificationCE, ATEX
Working Voltage12-36V DC
Case MaterialDie-casting aluminum housing
Operating Temperature-20o~50o
Operating Humidity0~95%RH (non-condensing)
AccessoriesPower adapter: Input 100-240VAC 50/60Hz, Output 24VDC 2A (Optional USA plug & Europe plug)

Note: The output signal 4-20mA and RS485 CANNOT be used at the same time.

Fixed Gas Detector Dimension (Unit: mm)

Other Common Gases and Ranges Available for Fixed Gas Detectors

* Some common gases and the measuring ranges are listed in the above table. For more information, please feel free to contact us.
10 Tips for Installing Fixed type Ammonia (NH3) Gas Detector

  • The fixed ammonia (NH3) gas detector shall not be installed in the place which has high concentration of smoke, jet-propelled insecticide and combustible solvent (coating), otherwise it may cause an alarm.
  • The fixed ammonia gas detector shall not be installed at the place with large wind flow, such as the vent, ventilator and door. It may affect the accuracy of ammonia detector.
  • The fixed ammonia detector shall not be installed at the place with much water vapor or water drops (relative humidity is above 90%), otherwise the ammonia sensor may be damaged for being placed in water vapor for a long term.
  • The fixed NH3 detector shall not be installed at temperatures below -30℃ or below 50℃.
  • The fixed ammonia detector shall not be installed in a strong electromagnetic field.
  • As soon as the ammonia detector sends a concentration alarm signal, the output control signal will be locked, even if the gas concentration doesn’t continue to exceed the limit, the controlled device is still unable to restore the pre alarm state automatically, manual reset is required (press the reset button or self-calibration for 3 seconds).
  • The fixed NH3 gas detector shall be installed in a higher place of the farm because the concentration of ammonia is lighter than the air.
  • If alarm, the ammonia concentration has exceeded the set alarm concentration. After the cause for excessive NH3 concentration is removed, press the reset button to clear the alarm data.
  • It’s normal for the alarm sound in the first power-on in case the ammonia detector has been powered off for a long time.
  • After the ammonia detector is fixed, do not move its position at will, so as not to damage the accessories.