It is understood that the flammable gas alarm belongs to the state compulsory measurement instruments, widely used in metallurgy, petroleum, chemical, petrochemical, coal and other industries and municipal gas, warehousing, transportation, hotels and fire departments. When the flammable or toxic gas in the environment leaks, when the gas concentration reaches the critical point of explosion or poisoning set by the alarm device, the combustible gas alarm device will send an alarm signal to remind the staff to take safety measures to prevent explosion, fire and poisoning accidents. To ensure safe production. Due to the normal use of the alarm sensor, the sensitivity of the alarm sensor naturally decreases by 10% to 30% each year. If the sensitivity of the alarm sensor drops, the leaked gas concentration reaches the lower explosion limit and fails to be alarmed in time, causing an explosion hazard. Therefore, the alarm needs to be periodically verified every year to ensure the accuracy and reliability of its performance and value.
During the regular verification of liquefied gas flammable gas alarms, the zero drift of flammable gas alarms and the damage of gas detectors are the real reasons for determining the failure of alarms. In the course of our inspection and maintenance, explosion-proof facilities for flammable gas alarms are often found. Broken, broken phenomenon. The causes of zero drift, detector damage and the main measures taken:
First: The alarm of some manufacturers of flammable gas alarms adopts the constant voltage bridge power supply method. In this way, because the line resistance changes with the change of atmospheric temperature, cause the zero drift of the instrument, and bring the additional indication error, for this reason, can adopt the constant current bridge way to eliminate.
Secondly, the zero point of the combustible gas alarm may also cause the irreversible change in the resistance value of the detection element D after it is struck by a high concentration of flammable gas and does not reach the damage state. The resulting unbalanced output of the bridge Cause zero drift. This can be handled as zero output by the nulling circuit of the control unit. If the unbalanced output is increased to 20% of the full scale, and the zeroing means of the control unit cannot be adjusted to zero output, the repair detection sensor assembly should be replaced.
Thirdly, there is no regular cleaning of the gas detector rain cover, oil and droplet condensation, and the accumulation of flammable gas near the detector probe causes zero drift. At this point should be cleaned dirt, cleaning process must be clean, can not remain solvent (do not use gasoline, acetone and the like solvent), can be soaked in anhydrous alcohol and brushed and dried with water several times, in the rain cover damage or no defense The rain cover should be replaced and installed in time. We found similar situations many times during our inspection and maintenance.
Fourth: artificial high-concentration combustible gas shocks, such as lighters, alcohol cotton, petrol droplets, etc. directly close to the gas detector, may be caused by 2 to 3 times or even higher concentration of the impact, from the sensor components The chemical activity is attenuated or inactivated in the early stage, and the platinum wire is burnt off. Therefore, high concentrations of combustible gases should be avoided. Check its working condition with isobutane gas as the standard gas source.
Fifth: Frequently drip, shower, spatter, splashing places should be improved.
Sixth: The explosion-proof facilities of the combustible gas alarms are damaged. For example, if the explosion-proof seals are damaged, loosened, the explosion-proof flexible tubes are broken, the fastening bolts are loosened, and the explosion-proof stringing boxes are broken, they must be repaired or replaced in time.
SMS/DS Sanitary Pipe Fitting Specification:
â–ª Standard:3A, DIN, SMS, BS, RTJ, ISO, IDF, DS, INCH, etc
â–ª Material: Stainless Steel 304 (1.4301), Stainless Steel 316L(1.4404) etc.
▪ Size Range: 1/2″ to 12″ / DN15 ~ DN300
â–ª Connection Type: Welded, Tri-Clamped, Threaded
Surface Finish:
Mechanically polished and electropolished are available for our products.
Tube and Fittings: Ra0.4, Ra0.6, Ra0.8 or specified
Both outside and inner available.
Quality & Inspection:
â–ª PMI test to verify material grade
â–ª Dimension controlling during fabricating and finished
â–ª Visual and surface 100% examination before shipment
â–ª Packed in carton box firstly, then in wooden case
During the regular verification of liquefied gas flammable gas alarms, the zero drift of flammable gas alarms and the damage of gas detectors are the real reasons for determining the failure of alarms. In the course of our inspection and maintenance, explosion-proof facilities for flammable gas alarms are often found. Broken, broken phenomenon. The causes of zero drift, detector damage and the main measures taken:
First: The alarm of some manufacturers of flammable gas alarms adopts the constant voltage bridge power supply method. In this way, because the line resistance changes with the change of atmospheric temperature, cause the zero drift of the instrument, and bring the additional indication error, for this reason, can adopt the constant current bridge way to eliminate.
Secondly, the zero point of the combustible gas alarm may also cause the irreversible change in the resistance value of the detection element D after it is struck by a high concentration of flammable gas and does not reach the damage state. The resulting unbalanced output of the bridge Cause zero drift. This can be handled as zero output by the nulling circuit of the control unit. If the unbalanced output is increased to 20% of the full scale, and the zeroing means of the control unit cannot be adjusted to zero output, the repair detection sensor assembly should be replaced.
Thirdly, there is no regular cleaning of the gas detector rain cover, oil and droplet condensation, and the accumulation of flammable gas near the detector probe causes zero drift. At this point should be cleaned dirt, cleaning process must be clean, can not remain solvent (do not use gasoline, acetone and the like solvent), can be soaked in anhydrous alcohol and brushed and dried with water several times, in the rain cover damage or no defense The rain cover should be replaced and installed in time. We found similar situations many times during our inspection and maintenance.
Fourth: artificial high-concentration combustible gas shocks, such as lighters, alcohol cotton, petrol droplets, etc. directly close to the gas detector, may be caused by 2 to 3 times or even higher concentration of the impact, from the sensor components The chemical activity is attenuated or inactivated in the early stage, and the platinum wire is burnt off. Therefore, high concentrations of combustible gases should be avoided. Check its working condition with isobutane gas as the standard gas source.
Fifth: Frequently drip, shower, spatter, splashing places should be improved.
Sixth: The explosion-proof facilities of the combustible gas alarms are damaged. For example, if the explosion-proof seals are damaged, loosened, the explosion-proof flexible tubes are broken, the fastening bolts are loosened, and the explosion-proof stringing boxes are broken, they must be repaired or replaced in time.
Stainless Steel SMS/DS Sanitary Pipe Fittings, SMS/DS Hygienic Fittings, SMS/DS food grade fittings,Material in SS304 & SS316L, Standard including 3A, DIN, SMS, BS, RTJ, ISO, IDF, DS, INCH, etc,size from 1/2" to 12", used in Food, milk, beer, brewage, pharmacy, comestic, biopharmacy, etc.Connection Type have Welded, Tri-Clamped, Threaded ends. Welcome to buy SMS/DS sanitary pipe fittings, SMS/DS Hygienic Fittings, SMS/DS food grade fittings from us in wholesale price, if you have any questions or requests, pls feel free to contact us!
SMS/DS Sanitary Pipe Fitting Specification:
â–ª Standard:3A, DIN, SMS, BS, RTJ, ISO, IDF, DS, INCH, etc
â–ª Material: Stainless Steel 304 (1.4301), Stainless Steel 316L(1.4404) etc.
▪ Size Range: 1/2″ to 12″ / DN15 ~ DN300
â–ª Connection Type: Welded, Tri-Clamped, Threaded
Surface Finish:
Mechanically polished and electropolished are available for our products.
Tube and Fittings: Ra0.4, Ra0.6, Ra0.8 or specified
Both outside and inner available.
Quality & Inspection:
â–ª PMI test to verify material grade
â–ª Dimension controlling during fabricating and finished
â–ª Visual and surface 100% examination before shipment
â–ª Packed in carton box firstly, then in wooden case
SMS/DS Sanitary Pipe Fittings,SMS/DS Sanitary Fittings,SMS/DS Hygienic Fittings,SMS/DS Fittings,SMS Sanitary Fittings,SMS Fittings
Kaysen Steel Industry Co., Ltd. , https://www.chinasanitaryvalve.com