Honeywell XNX™ Universal Transmitter Technical Manual

The Honeywell XNX™ Universal Transmitter Technical Manual is critical to read as it is a vital gas sensor tool. This Technical Manual is complete and detailed. Please read carefully so this tool can function as a gas detector.

Honeywell XNX™ Universal Transmitter


To detect poisonous gases, flammable gases, and oxygen depletion gas dangers, the XNX Universal Transmitter uses various sensor technologies, including catalytic beads, electrochemical (EC), or infrared (IR). This system is made to work in hazardous locations1. There is a specific personality board for each technology. The XNX mV personality board makes use of catalytic bead technology. Catalytic bead sensors are frequently employed for flammable gas detection because they react to various combustibles.

The XNX electrochemical board employs electrochemical technology. EC sensors measure low amounts of harmful gases. The XNX EC sensors use the unique ReflexTM cell fault diagnosis procedure. Cell presence, dry-out, and open or short circuits are all checked by ReflexTM. At eight-hour intervals, the transmitter automatically starts ReflexTM. On power-up or a sensor swap, it also creates. A sensor error code is shown on the screen if a cell fails this test. During the initial minutes of the power-up sequence, ReflexTM diagnostics take place. When using the XNX IR board, infrared technology is employed. IR sensors optically absorb infrared-absorbing gases.

Installation and Operation

According to the recommendations of experts with specialized knowledge of gas dispersion, experts with knowledge of the process plant system and equipment involved, safety and engineering employees, and experts with knowledge of the included equipment, the location of sensors should be decided. It’s essential to document the decision made on the placement of the sensors. When placing gas sensors, take into account the following:

  • Weather-related occurrences like rain or flooding bring on potential harm.
  • The simplicity of access for functional testing and maintenance.
  • How could escaping gas act in response to free or forced air currents?
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The XNX Universal Transmitter uses several calibration techniques for each sensor technology it supports. The accompanying description demonstrates the XNX interface with the sensor. The definition does not replace each sensor’s methods in the operating manual. The menu for gas calibration is utilized for functional gas testing and zero and span calibration (bump test). The Main Menu is where you’ll find the Gas Calibration menu.

The “Calibration Required” diagnostic’s default calibration values change depending on the kind of sensor. This value can be reprogrammed to match site specifications for the best safety level. Before commissioning, calibration with a certified test gas of known concentration should be performed on each sensor to ensure proper operation.


The replaceable sensor enables the sensor’s internal cell to be changed. The sensor cell can be modified to detect a different target gas or replaced with a cell of the same type. Both steps are taken. The initial warm-up period while changing oxygen (O2) sensor cells is between 10 and 15 minutes. Only after the replacement of the sensor cell is this warm-up necessary.

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