The correct use and maintenance of combustible gas detectors
Portable combustible gas detector explosion detectors and toxic gas detectors can suffer from faults such as false alarms, no alarms or long alarm response times during use, and inadequate day-to-day management and maintenance can lead to greater safety risks.
It is necessary to ensure that on-site online detection and portable detection instrumentation configuration in place, and combined with job risk factors and emergency escape training for employees. The control room of the production site should have a map of the distribution of detectors, and on-site reporting and control room to remind personnel through sound, flash and other forms of attention.
1. Maintenance: Trained personnel should be responsible for daily inspection and maintenance, establish ledgers, and conduct regular inspections and records. The ledger should include name, measuring medium, alarm value, brand, model, production date, validation cycle, serial number of equipment, site layout, wiring diagram of central control, and person in charge.
Establishment of a management system, the timing of regular maintenance and calibration, the person responsible for carrying out the maintenance and calibration, what is maintained and calibrated, how it is maintained and calibrated, and where it is maintained and calibrated.
It is recommended that indicators and alarm systems be checked for proper functioning at regular intervals, zero points checked monthly, and ranges calibrated every three months. Visual inspections include the detector's connecting parts, moving parts, display parts, control knobs, fault lights, explosion-proof seals and fasteners, whether detector parts are clogged, and whether the detector rain cover is intact.
The configuration of portable detection alarms in many companies may have exceeded that of fixed detection alarms, but their management and maintenance are far inferior to that of fixed detection alarms and there are many loopholes in practice. Management is usually the responsibility of the user, can not guarantee the instrument charging and discharging time and calibration cycle, the integrity rate is relatively low, the user is difficult to find the deviation of the display data, the risk is high. Especially when used for dynamic monitoring of "fire operation" and "restricted space operation", the failure of portable alarms will bring greater safety risks.
(2) Calibration and verification: refer to the standard "Combustible Gas Detection and Alarm Verification" (JJG693-2011). Combustible gas alarm with 50% LEL methane or propane calibration, the alarm value of low reported not more than 25% LEL, high reported not more than 50% LEL. toxic gases vary depending on the detector. Conventional toxic gases generally have corresponding standard gases, such as NH3, H2S, CO, etc.. The instrument should be checked/calibrated in advance before its expiry date. During the inspection period, the relevant departments should be notified of the loss of the detector instrument on site and the corresponding plan should be initiated.
Due to the special characteristics of portable combustible gas detectors and explosives detector, in normal use of its regular calibration and maintenance is very important, usually no maintenance and calibration of good directly affects the value of its measurement of high and low, thus causing unnecessary losses.
