gas detectorIt is mainly divided into two types: portable gas detector and handheld gas detector, which is an instrumentation tool that senses toxic and harmful gases in the environment through sensors and issues early warningsgas detectorIt is necessary to carry out correct installation to ensure normal use, let's briefly introduce it.
Installation of the gas detector
The first step is to willgas detectorInstalled in areas where there may be gas leakage, the gas detector must be installed firmly, and the installation position is determined according to the specific gravity of the measured gas relative to the air, because the specific gravity of the measured gas is less than that of the air, the detector should be installed 30~60cm away from the roof. Fix the detector to the wall with Φ8 expansion screws.
However, in order to ensure the correct use of detectors to prevent their failures, the following are the phenomena to pay attention to (places that are not easy to install):
1. The temperature is below -40°C or above 70°C
2. Air supply outlets, ventilation fans, doors and other places with large air flow
3. Places with a lot of water vapor and water droplets (relative humidity: greater than 90%)
4. Places directly affected by steam and fumes
The second step is wiring: the wiring should use a highly shielded wire to prevent electrical signals from being interfered with, lay the wire properly, and open the top cover.
1、gas detectorThe gas detector generally adopts a three-wire transmission, and the positive electrode of the power supply is marked (the terminal of "VCC"), the signal wire (the terminal marked with "SIG"), and the negative electrode of the power supply (terminal marked "GND") correspond to the "24V, mA and GND" of a set of terminals marked "4-20mAIN" of the access channel module The shell ground (the shielding network of the cable) is well grounded, and after connecting the wires, fasten the chassis.
2. Start: After the wiring is completed, power supply to the detector. After starting, the reading will go from the measuring range to the stable reading, which takes about 15 minutes.
In addition to proper installation, simple repairs should also be understood.
1. Sensor maintenance: generally re-checked and calibrated after half a year to one year of installation and use, and the test report will be issued by the testing party.
2. Whengas detectorThe sensor needs to be replaced when it loses its sensitivity, such as metal tube float flow meter, turbine flow meter, vortex flow meter, through regular calibration will know whether the sensor is invalid, when the calibration value does not reach the standard gas value, the sensor should be replaced.
3、gas detectorInspection of the whole machine: The detector should be checked regularly, and its signal current in clean air is DC4mA.