How to install and maintain the gas detector?
Gas detectors are mainly divided into two types: portable gas detectors and hand-held gas detectors. They are instrumentation tools that issue early warnings by sensing toxic and harmful gases in the environment through sensors. When using gas detectors, they must be Correct installation can ensure normal use, let's briefly introduce it below.
Gas detector installation
The first step is to install the gas detector in an area where there may be gas leakage. The gas detector must be installed firmly, and the installation position is determined by the specific gravity of the gas to be measured relative to the air. Because the specific gravity of the gas to be measured is smaller than that of air, the detector should be Installed at a distance of 30-60cm from the ceiling. Fix the detector on the wall with expansion screws.
However, in order to ensure the correct use of the detector to prevent its failure, the following are the attention phenomena (places that are not easy to install):
1. Where the temperature is below -40°C or above 70°C
2. Places with large air flow such as air inlets, ventilation fans, and room doors
3. Places with a lot of water vapor and water droplets (relative humidity: greater than 90%)
4. Places directly affected by steam and oil fume
The second step is wiring: the wiring should use highly shielded wires to prevent electrical signals from being interfered, arrange the wires, and open the top cover.
1. The gas detector of the gas detector generally adopts a three-wire transmission system, and the positive pole of the power supply is marked (terminal "VCC"), the signal line (terminal marked "SIG"), and the negative pole of the power supply (terminal marked "GND") ) respectively correspond to "24V, mA and GND" of a group of terminals marked "4-20mAIN" on the access channel module, and the chassis ground (cable shielding network) is well grounded. After connecting the wires, fasten the chassis.
2. Startup: After wiring, supply power to the detector. It will take about 15 minutes for the reading to go from over-range to stable after just starting up.
In addition to correct installation, you should also know about simple maintenance.
1. Sensor maintenance: Generally, re-inspection and calibration will be carried out after installation and use for half a year to one year, and a test report will be issued by the testing party.
2. When the sensor of the gas detector loses its sensitivity, it needs to be replaced. Metal tube float flowmeter, turbine flowmeter, vortex flowmeter, through regular calibration, you will know whether the sensor is invalid. When the calibration value does not reach the calibration gas value, you must Replace sensor.
3. Check the whole machine of the gas detector: the detector should be checked regularly at ordinary times, and its signal current is DC4mA in clean air
