The Q45S wet gas sulphide monitor is an odour monitoring system that uses our standard Q45 electronics package in conjunction with a special Wet H2S sensor. Measurements may be either at the inlet to scrubber systems where gas concentrations can run as high as 200ppm or at the outlet, where gas concentrations are ideally down below 0.5ppm. Special gas sensor configurations are available for either duct insertion or flowcell use.

Because Q45S Wet H2S Gas Detector systems are often monitoring gas streams with condensing levels of water vapor, provision has been made for eliminating water droplets from the gas sensor that could present a barrier to the diffusion of hydrogen sulphide into the sensor. An optional air-purge system controlled by the gas transmitter will periodically deliver a blast of air across the critical sensor surfaces to remove water droplets. This system insures a clear gas diffusion path to the sensor and reliable measurements on a continuous basis.

Q45S hydrogen sulphide transmitters provide a large, easy to read LCD display of H2S concentration with a second display line to indicate other status information. An alarm contact is available for external alarming functions, and a second contact may be used for alarm purposes if the air purge system is not implemented in a given application. An isolated 4-20 mA output is provided for remote data transmission, and output spans are user programmable for ranges of 0-2.000ppm up to 0-200.0ppm.

Key Facts

  • Special Wet H2S Sensors: System utilizes a special sensor designed to operate in condensing gas streams without the water vapor blinding typical of standard sulfide sensors.
  • Automatic Sensor Air Purge: An automatic system for purging accumulated droplet water from the face of the sensor insures long-term operation without loss of sulfides in condensed water on the sensor face.
  • Two Internal Alarm Relays: Q45S monitors contain relays that can be used for local alarm functions. One relay is used to control the air-purge system and the other is available for external alarms. Relays are  programmable for setpoint, hysteresis, and delay functions.
  • LCD Display: Gas Concentration is displayed in large, easy to read numbers. The display also provides a second information line indicating raw sensor output, mA output, and other information. The display also allows easy programming using the 4 keys located on the front panel.
  • Internal Data Logger: Available in the battery-powered version, the data-logger will store up to 10 days of data at 1 minute storage intervals.
  • Output Simulation: Transmitter analog output can be set to user definable values and relay outputs can be set to specific states for complete simulation of detection system operation. Output and alarms may also be inhibited for maintenance and calibration.
  • Weather-proof Nema 4X Enclosure: Transmitters are designed for operation in typical wastewater treatment plant environments. The electronic assembly is CSA/UL certified.

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