Explosion proof dew point meterIt is a specialized instrument used to measure the dew point temperature of gases in explosive environments. Its operation not only affects the accuracy of measurement data, but also directly relates to on-site safety. Based on its explosion-proof characteristics and measurement principles, the following operational precautions must be strictly followed to avoid safety risks and ensure stable operation of the equipment.
1、 Core precautions for explosion-proof safety
Explosion proof performance is a prerequisite for the safe operation of equipment. During operation, it is necessary to strictly follow explosion-proof regulations and prevent any behavior that damages the explosion-proof structure.
Environment matching check: Before starting up, it is necessary to confirm that the explosion hazard zone level of the usage environment (such as Ex d IIB T4 applicable to IIB gas and T4 temperature group below) is consistent with the explosion-proof mark of the instrument. It is strictly prohibited to use it in environments beyond the scope of adaptation to avoid explosions caused by insufficient explosion-proof levels.
Explosion proof structure protection: The explosion-proof shell, sealing gasket, cable entry device and other components of the instrument are strictly prohibited from being disassembled, modified or replaced without authorization. If the shell is damaged, the seal is not tight, or the explosion-proof label is unclear, the machine should be stopped immediately and professional maintenance personnel should be contacted. It is prohibited to continue using it.
Electrical connection specifications: When wiring, the on-site power supply must be disconnected, and explosion-proof cables matching the instrument must be used to ensure that the wiring terminals are securely fastened and well insulated. It is strictly prohibited to plug or unplug cables or open the instrument casing while it is powered on, in order to prevent the generation of electrical sparks that can ignite explosive gases.
2、 Precautions for Measurement Operation Standards
A standardized measurement process is the key to ensuring accurate data, and attention should be paid to details such as sample processing, instrument preheating, and operating techniques.
Sample pretreatment and connection: Before measurement, it is necessary to check whether the sample gas path is clean and leak free. If the sample contains oil, dust, or corrosive impurities, it must be processed through a pre filter to avoid contaminating the sensor and affecting measurement accuracy. When connecting the gas circuit, a dedicated explosion-proof joint should be used and slowly tightened to prevent sample gas leakage. After the connection is completed, airtightness testing should be carried out.
Instrument preheating and calibration: After starting up, it is necessary to preheat according to the instructions (usually about 30 minutes), and then measure after the instrument display is stable. It is recommended to calibrate the instrument with standard gas before the first use or after long-term idle, to ensure that the measurement error is within the allowable range (generally ± 0.2 ℃ dew point).
Measurement process control: During measurement, it is necessary to control the flow rate of the sample gas (usually 0.5-1L/min). If the flow rate is too fast, it can lead to unstable sensor response, while if it is too slow, it can prolong the measurement time. If there is a significant fluctuation in the data during the measurement process, the air path should be checked for blockage or leakage first, rather than directly adjusting the instrument parameters.
3、 Environmental and equipment maintenance precautions
Reasonable environmental control and daily maintenance can extend the lifespan of equipment and avoid malfunctions caused by external factors.
Environmental condition control: The instrument should be avoided from use in environments with high temperature (over 40 ℃), high humidity (relative humidity over 85%), or severe vibration. It should be kept away from strong electromagnetic interference sources (such as large motors and transformers) to prevent environmental factors from affecting the stability of the instrument circuit and sensor performance.
Sensor maintenance: After the measurement is completed, the sensor needs to be purged with inert gas (such as nitrogen) to remove residual sample gas. Especially after measuring corrosive gases, the sensor must be thoroughly cleaned. The service life of sensors is usually 1-2 years, and their response sensitivity needs to be checked regularly. After reaching the end of their service life, they should be replaced in a timely manner.
Shutdown and storage: When shutting down, the sample gas valve should be closed first, and the power should be cut off after the internal pressure of the instrument drops to atmospheric pressure. When storing, the instrument should be placed in a dry, ventilated, non explosion proof environment, away from direct sunlight, and regularly powered on (once a month) to prevent battery depletion or circuit moisture.