How to use a methane alarm? What does it do?

1. Explosion-proof type. Mine intrinsic safety and flameproof type; Explosion-proof marking: measuring range and basic error of measurement.

Measuring range: digital display, small resolution alarm mode and alarm point. Overrun alarm:

After one charge, the continuous working time is more than 10 hours. 5. Applicable environmental conditions. Temperature:

0-40 RH: 98%rh. Atmospheric pressure:

80-116）kpa。Storage temperature: (40-60).

6. Dimensions: 100 mm, 57 mm, 25 mm. 8. a charger.

It can be combined and detached, and multiple single chargers can be combined at will. Charging party....

Methane alarms are suitable for continuous monitoring of methane concentration in coal mine roadways, mining faces, goafs, return air roadways, electromechanical chambers and other places. When the methane concentration exceeds the limit, it can automatically send out sound and light alarms, which can be carried and used by underground coal mine operators, methane testing personnel, underground management personnel, etc., and can also be used in the above-mentioned places.

The methane alarm is mainly used to check the methane concentration in the mine, and it can be understood to see if the asttar is exceeded.

Summary. Hello dear, I'm glad to serve you, and will try to help you answer it!Methane alarm or propane alarm for liquefied gas:

Combustible gas alarms, methane and propane are not universal, so in the gas security industry, combustible gas detectors are calibrated with methane standard gas, while liquefied gas detectors, as ordinary combustible gas, use isobutane standard gas. The lower limit of methane is 5% vol and the lower limit of isobutane is. From the lower limit of standard gas, it can be concluded that the accuracy of measuring natural gas with liquefied gas alarm is not high.

Therefore, combustible gas alarms are different. It needs to be determined based on the gas detected.

Hello dear, I'm glad to serve you, and will try to help you answer it!Methane alarm or propane alarm for liquefied gas: combustible gas alarm methane and propane are not universal, so in the gas security industry, combustible gas detectors are calibrated with methane standard gas, and liquefied gas detectors, as ordinary combustible gas, use isobutane standard gas.

The lower limit of methane is 5% vol and the lower limit of isobutane is. From the lower limit of the standard gas, it can be concluded that the accuracy of measuring natural gas with liquefied gas alarm is not high. Therefore, it is said that the state is not allowed to use the combustible gas alarm.

It needs to be determined based on the gas detected.

Extended information: Because the main components of liquefied gas are propane, propylene, butane, butene, and natural gas, while the main component of natural gas is methane. The two are not mutually exclusive.

In addition, there is a difference between the weight of the two gases and the installation position of the wax sparrow, the natural gas gas is lighter, the alarm is generally installed above the room, and the liquefied gas alarm is generally installed below the room. I hope I can help you, if you don't know anything, you can continue to ask, don't end the consultation, I will answer for you as soon as possible, if you feel satisfied, you can help give a 5-star praise in the round, your satisfaction is my biggest motivation, thank you!

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Summary. 5. Gas interference: When using a portable methane detector, in order to ensure the accurate detection of methane concentration, the interference of other gases should be avoided as much as possible.

In the presence of other high concentrations of gases, it is likely that special phenomena such as inaccurate readings and unstable data will occur, and even damage the sensor. Therefore, it is important to ensure that no other high concentrations of gases are present before testing.

6. Range: Before using the instrument, you must understand the range of the detector and the concentration of methane in the environment to be detected. Methane sensors are only likely to be damaged if the measurement is only completed within its measurement range, and if it exceeds several times of the range concentration range.

Precautions when using the portable methane alarm monitor.

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Portable methane detectors are widely used in environmental testing operations, such as tunnels, mines and other places. When users purchase a portable methane detector, what are the precautions when using it? The gas detector can improve the efficiency of production and ensure the safety of life and property of workers, but only when we use the instrument correctly, can it play a role in monitoring and protection.

1. Before using the instrument, in addition to reading the instruction manual, checking or knowing which to measure the battery power, checking the inlet filter and other basic Lu macro operations, when we use the gas detector, we should also pay careful attention to the self-test of each function in the self-test stage to ensure that the functions of the instrument, such as alarm sound, alarm light, etc., are in normal working condition. 2. If the instrument fails during use, please do not disassemble the machine without permission, the correct approach should be to contact the manufacturer in time, if you need to repair the shirt code, send the instrument back, and the manufacturer's professionals will repair it.

3. In the process of use, it is necessary to do a good job of cleaning and maintenance. The dust cover and air intake hole are blocked by stains, which will affect the normal detection of Qixiang instruments. We need to clean the instrument regularly, for example, to remove dust from the surface.

When we do not use the instrument for a long time, we should turn off the finger machine and store the instrument in a dry, dust-free and suitable temperature environment, and the storage location should also avoid the fall of the instrument next to the device. 4. Calibration: After purchasing a portable methane detector, the methane detector needs to be calibrated every six months, and the calibration time should be appropriately shortened for customers who use it frequently.

5. Gas interference: When using a portable methane detector, in order to ensure the accurate detection of methane concentration, the interference of other gases should be avoided as much as possible. If there are other high concentrations of gases, it is likely that special phenomena such as inaccurate readings and unstable data will occur, and even damage the sensor.

Therefore, it is important to ensure that there are no other high-concentration gases before testing. 6. Range: Before using the instrument, you must understand the range of the detector and the concentration of methane in the environment to be detected.

Only if the measurement is completed within its measurement range, if it exceeds several times of the range concentration range, it is likely to cause damage to the methane sensor.

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Methane alarm is mainly used in petroleum and petrochemical, sewer, tunnel, underground corridor, biogas and other places, used to detect the concentration of methane (can not exceed 5%vol) of an alarm device.

1. The range of the methane alarm is generally 0-5%vol, because the lower limit of methane is 5%vol

There are two commonly used methane alarms, one is the catalytic combustion principle, and the other is the infrared principle.

Catalytic combustion principle: the most commonly used, low, sensitive, stable performance, but if there are other flammable gases in the same environment, he detects the content of all combustible gases.

Infrared principle: slightly expensive, good sensitivity, good anti-interference, can detect a large range of methane: 0-10%, 20%, 50%, 100% vol

Second, the installation of methane alarm:

Installation: wall, column, pipe.

Wire selection: 4*shielded wire.

Installation location: within 1 meter above the leak source.

Power supply: 24VDC, output: 4-20mA RS-485 switch.

The measurement range of the methane detection alarm is CH4:0, the measurement principle is a catalytic combustion sensor, the time display is 24-hour clock, and the measurement accuracy CH4 is 01% CH4 or 10%, the resolution is, and the degree of protection is IP65.

1. Whole machine inspection: The detector should be checked regularly, and its signal current in clean air is DC4mA

2. Sensor maintenance: Generally, it is necessary to re-check and calibrate after half a year to one year of installation and use, and the test report will be issued by the detector.

3. When the sensor of the gas detector loses its sensitivity, it needs to be replaced, and the sensor will be known whether it fails through regular calibration, and the sensor should be replaced when the calibration value does not reach the standard gas value.

Recalibration is usually carried out 7-10 days after use.

The methane detection and alarm instrument is suitable for personal matching in coal mines. Changsun virtual instrument for underground gas measurement and detection; It can be used in places such as damp and dark dust to detect hydrocarbon compounds.

Portable methane detection alarms must be charged before each use to guarantee their reliable operation. Turn on the power in clean air and preheat for 15 minutes to see if the indication is zero. When measuring, lift or hang the sensor part of the instrument to the measurement point by hand, and the gas concentration value can be read after more than ten seconds; It can also be carried by the staff to monitor the environmental gas and take corresponding measures when the sound and light alarm is issued when the gas exceeds the limit.

Attention should be paid when using the instrument:

1. To protect the instrument, it is strictly forbidden to hit and collide violently during carrying and use; It is strictly forbidden to be watered or soaked.

2. If the voltage is found to be insufficient in use, it should be stopped immediately, otherwise it will affect the normal operation of the instrument and shorten the service life.

3. The thermal catalytic (thermal efficiency) gas detector is not suitable for use in areas containing sulfur dioxide and places where the gas concentration exceeds the allowable value of the instrument.

4. The zero point, test accuracy and alarm point of the instrument should be calibrated regularly to make the instrument accurate and reliable.

In order to allow you to use this product more safely and reliably, the installation precautions are explained as follows:

1. Precautions for installation.

1.The installation of the transmitter must be carried out by a professional.

2.When monitoring the gas with specific gravity less than air, it is advisable to install the transmitter at the place from the ceiling, and when monitoring the gas with specific gravity greater than the air, it is advisable to install the transmitter at the distance from the ground at the meter.

3.The detection range of the transmitter in the specific environment is related to many factors, such as the type of gas to be detected, the wind direction and wind speed in the detection environment. Our recommended detection range is 6 6 square meters; The length of the pipe is 6 meters.

4.In new buildings, the transmitter should be installed after the painting and welding work has been completed.

5.Do not install the transmitter too close to steam or oil smoke.

6.Do not use the transmitter by immersing it in water or other liquids.

7.According to the distance between the two transmitter fixing holes, install two m6 expansion screws at appropriate positions on the wall; Use M6 cube nuts and flat pads to secure the transmitter to the wall.

8.Connecting cables:

Refer to the "Structure of the Gas Detector" and "Terminal Instructions" to connect the cable correctly, close the upper cover of the gas detector, and complete the installation on site.

When linkage is required, the switching terminal can be connected (normally open signal).

Note: The maximum contact capacity of the linkage signal is: (1A 24VDC), if you need to drive high-power equipment, please add AC contactor.

9.It is strictly forbidden to open the cover with electricity on site;

10.It is strictly forbidden to replace the sensor with electricity;

11.Do not install the transmitter in a high-temperature, high-humidity environment;

12.Installation, commissioning, set-up and other operations must be carried out by professionals;

13.Sensors that have exceeded the effective service life and are faulty should be replaced in time;

14.Transmitters stored below zero should be left at room temperature for at least 2 hours before being powered on.

15.The transmitter that has not been used for a long time should be powered on and warmed up for 2 hours before it can be used normally.

1.The portable methane alarm is calibrated by the monitoring and monitoring team arranged by the defense area, and the calibration is strictly in accordance with the "Portable Methane Detection and Alarm Calibration Operation Procedures" for the zero point, test accuracy and alarm point adjustment of the instrument, and the calibration cycle of each instrument is once a week.

2.The calibration and maintenance personnel of the instrument should carefully study the maintenance manual and instructions for use, repair and maintain in strict accordance with the prescribed methods and precautions, and check and maintain the instrument at the same time to ensure that the instrument integrity rate must reach more than 98%.

3.The calibration room should establish maintenance and calibration records, and record the contents of each instrument number, maintenance and calibration date, adjustment, fault handling, etc. one by one.

4.The instruments sent for calibration on the same day must be calibrated to ensure that the instruments are issued and recycled.