Does the four-in-one gas detector need to be calibrated regularly?
I believe everyone knows that the four-in-one gas detector, also known as the composite gas detector, is mainly used for routine detection of four gases, namely: combustible gas EX, carbon monoxide CO, hydrogen sulfide H2S, oxygen O2, then four-in-one Does a gas detector need to be calibrated regularly? In response to this problem, let me introduce it in detail next.
The answer is yes, the four-in-one gas detector should be re-verified at least once a year. The verification method of the four-in-one gas detector can be implemented by referring to the corresponding national standards for the verification procedures of the single gas detector, specifically referring to the verification regulations of the gas detectors for combustible gas Ex., hydrogen sulfide H2S, oxygen O2 and carbon monoxide CO.
Let's first look at the requirements for the verification period in the verification regulations of these four gas detectors:
1. Combustible gas Ex.
National standard basis: JJG 639-2011 Verification regulations for combustible gas detection and alarm
Verification cycle: The verification cycle of the instrument is generally not more than 1 year
2. Hydrogen sulfide H2S
National standard basis: JJG 695-2019 Verification Regulations for Hydrogen Sulfide Gas Detectors
Verification cycle: The verification cycle of the instrument is generally not more than 1 year
3. Oxygen O2
National standard basis: JJG 365-2008 Verification Regulations for Electrochemical Oxygen Meter
Verification cycle: The verification cycle of the instrument is generally 1 year
4. Carbon monoxide CO
National standard basis: JJG 915-2008 Verification Regulations for Carbon Monoxide Detection and Alarm
Verification cycle: the verification cycle of the instrument is 1 year
According to the requirements of the national standards for the verification of the above four gas detection instruments, it can be seen that any one or more gas detection and alarm instruments in carbon monoxide, oxygen, hydrogen sulfide, and combustible gases need at least one The metrological verification will be carried out again every year, so the detection instruments that detect these four gases at the same time also need to undergo regular metrological verification. As for how to conduct the verification, there are also relevant requirements in the national standard.
The items that need to be verified during the subsequent use of the four-in-one gas detector are as follows:
1. Combustible gas Ex.: Alarm function and inspection of alarm action value, indication error, response time, repeatability
2. Hydrogen sulfide H2S: alarm function, indication error, repeatability, response time
3. Oxygen O2: indication error, repeatability, response time
4. Carbon monoxide CO: alarm concentration value, alarm function, indication error, repeatability, response time
The above mentioned whether the four-in-one gas detector needs to be verified regularly will be shared here. In fact, in addition to the main verification items of the above-mentioned four-in-one gas detector during use, the basic appearance, structure, and signs should also be dealt with. All items are in good condition and clearly identifiable. Before the verification of the gas detector, at least the equipment needed for the verification such as gas standard substance, flow controller, zero point gas, stopwatch, pressure reducing valve and gas circuit should be prepared.
