DEVELOPMENT OF A METHOD FOR ASSESSING THE RESOURCE OF A SENSITIVE ELEMENT OF A PHOTOIONIZATION GAS ANALYZER
The article considers a multilevel approach to calibration verification, as well as the importance of this event. The layered approach includes: bump test, field test, full calibration, factory calibration. Software designed to track calibration times will allow for due diligence to be carried out in time, resulting in increased plant safety. Checking accuracy regularly is essential to avoid loss of sensor sensitivity. Loss of sensitivity is possible as a result of exposure to substances poisonous for the sensor or extinguishers that may be present in the studied atmosphere, as well as due to wear, coating formation on the sensors or their drying, from mechanical damage due to falling or immersion of the device in a liquid, as well as for other reasons. Combustible sensors can be destructively affected by high concentrations of gases, sulfides, halogen compounds, tetraethyl lead or silicone greases. Heavy fat and some phosphorus compounds can form a coating on the lamp and sensor of the photoionisation sensor devices, while moisture condensation can etch the salt crystal window in the lamp