Calibration of XNX Gas Detectors
To achieve the most accurate gas flow measurements, it is important to calibrate the sensitivity of your XNX gas detector. XNX gas detectors communicate using the HART protocol, defined by the Hartcommorg and the HART Communication Foundation. The use of HART is unique among fieldbuses, as it uses digital data rather than analog signals. If your XNX detector does not meet the HART protocol requirements, you should use a different brand.
To calibrate the sensitivity of your gas detector, you need to select the appropriate sensor model. The XNX Universal Transmitter has a default Unit ID that is assigned at factory. You can change the assigned ID by using the Edit ID menu. The Edit Unit ID screen uses switches and selectors to make changes. After completing the steps, the transmitter will generate a warning when the calibration interval is reached.
Detectors are calibrated using a Span Gas Concentration Screen. When the concentration changes, the values will reflect the new value. Once the calibration process has completed, the XNX Universal Transmitter will return to the Gas Calibration Menu. The next screen on the screen is the Span Gas Concentration Screen. Select the digits you wish to increment or decrement. If you do not need to calibrate a span gas concentration, you can skip it.
The Span Gas Calibration mode should be selected when the sensor is new. It is important to note that a Span Gas Calibration is not suitable for a range of gases that have very high concentrations. For this reason, you should use a different gas for each calibration. This will prevent the device from triggering false alarms. If the target gas is sticky, you should use PTFE tubing.
The Span Calibration screen will appear when the sensor has passed the zero-gas and spann gas calibration. If it doesn’t, you can choose to calibrate it. The calibration process will take a few minutes. To avoid the possibility of false alarms, you should check the Span Calibration screen before performing calibration. Afterward, you should use a different bottle of calibration gas.
XNX gas detector calibration procedure
Performing an optimum Span Gas Calibration is one of the essential steps for proper operation of a XNX iodine or ammonia detector. The Span Gas Calibration procedure involves calibrating the sensor with a known concentration of the gas to be measured. The Span Gas Calibration should be done before each use. Before the calibration procedure, it is necessary to check the gas concentration. The calibration gas should be a certified test gas.
Once you have performed Zero Gas Calibration, you can begin the Span Gas Calibration procedure. The XNX Universal Transmitter will detect the gas and display the concentration of the gas in the Span Gas Calibration screen. The XNX calibration procedure is similar for a Span Gas detector. After 3 minutes, the transmitter will calculate the zero adjustment. You can then skip the Span Calibration procedure if you prefer.
XNX gas detectors are equipped with HART communication protocols to communicate with other devices. HART stands for the HART Communication Foundation. Hartcommorg is the organization that defines the standard. Compared to other fieldbuses, HART is unique in that digital data is transmitted. Hence, it is ideal for use in industrial and commercial settings. The XNX ID South Tower includes an XNX HART Basic Menu.
If you have an XNX sensor, the calibration procedure can be performed by using a compressed gas cylinder. Refer to the technical manual for specific calibration information for each type of sensor. Ensure that you follow the calibration procedure by using the correct calibration gas. When the XNX iodine calibration procedure is complete, you can begin using the corresponding Span Gas or Zero Gas menu.
The Span Calibration procedure involves the installation of an EC sensor or mV sensor, as well as an XNX universal transmitter. In this procedure, the transmitter inhibits the output of the sensor while you monitor the gas. This calibration procedure is particularly important if you are using the XNX iodine detectors in environments with sticky gas. A PTFE or rubber tube is the final connection.
