TGas-1031 Series Combustible, Toxic and Harmful Gas Transmitter can continuously measure the concentration of site gas, and convert the concentration signal into 4-20mA output. It is extensively applied in petroleum, petrochemistry, chemical industry, gas, coal, metallurgy and electric power; safety detection in municipal administration, telecommunication and traffic tunnel construction; the place where combustible, poisonous and harmful gas might leak, such as gasholder station and special industrial factory building, etc.
Main features
l Two kinds of optional mode of power supply, including centralized busbar type and independent area type
l High and low concentration alarm, performing real-time monitor to gas
l Anti-poisoning type gas sensor with high sensitivity
l Automatic modification of ageing curve of sensor, keeping constant alarm sensitivity
l Function of automatic recognition of sensor trouble, function of high concentration gas above-norm of sensor
l Function of automatic detection at starting up, and it has advanced function of self-diagnosis and self-reparing.
l The calibrated concentration value is adjustable, facilitating users to set by themselves
l When the sensor loses the function of monitoring alarm because of ageing, the detector is capable of automatic recognition and alarm, so as to effectively avoid missing report.
Technical parameters
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Parameters
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Characteristics
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Detectable gas
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Combustible vapour of liquids, including methane, LPG, coal gas and gasoline, etc., as well as poisonous and harmful gas
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Measurement precision
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±5%F.S
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Repeatability
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2%
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Measurement range
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Refer to lectotype table for details
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Drift
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Zero drift: ±2%F.S
Range drift: ±5%F.S
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Response time
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＜30s(T90)
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Sampling method
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Diffusion
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Working environment
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Temperature: -30℃ to 60℃; humidity: below 85% (no coagulation)
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Remote control mode
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By the adjustment mode by infrared remote control, the detector can be adjusted without opening of cover
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4-20mA
output
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4-20mA output corresponding to 0-100%, maximum load 800 ohms
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Alarm output
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The effective alarm is 1 point or 2 points; each alarm shall use SPDT electronic relay.
Contact rating of alarm relay:
Ohmic load: 5A@24Vdc or 120Vac or 240Vac
Inductive load: 50VA
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Communication
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Communication description: two-wire system parallel RS485 protocol, 32 points at most
Connection: Twisted pair with shield
Distance: maximum 1000m
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Input voltage
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24VDC±25%; power: 2W/way
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Certificate
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Explosion-proof grade: ExdIICT5
Protection class: IP66
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Using cable
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≥2.5mm2×4 Screened cable line, outside diameter of cable is required to be between 6mm- 9mm
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Lectotype table for detected gas (part gas)
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Model
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Range
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Low alarm setting range
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High alarm setting range
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Low alarm point
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High alarm point
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TGas-1031-FL
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0-100%LEL
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10%LEL-5%LEL
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25%LEL-80%LEL
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20%LEL
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50%LEL
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TGas-1031-CO
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0-500ppm
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25ppm-100ppm
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100ppm-500ppm
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35ppm
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200ppm
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TGas-1031-CO
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0-1000ppm
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25ppm-100ppm
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100ppm-500ppm
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35ppm
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200ppm
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TGas-1031-H2S
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0-100ppm
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5ppm-15ppm
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15ppm-30ppm
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10ppm
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15ppm
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TGas-1031-SO2
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0-100ppm
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1ppm-3ppm
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3ppm-10ppm
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2ppm
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5ppm
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TGas-1031-CL2
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0-20ppm
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3ppm-10ppm
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5ppm-15ppm
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5ppm
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10ppm
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TGas-1031-NH3
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0-100ppm
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20ppm-30ppm
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30ppm-70ppm
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25ppm
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50ppm
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TGas-1031-NO
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0-250ppm
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20ppm-50ppm
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50ppm-100ppm
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25ppm
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50ppm
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TGas-1031-NO2
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0-100ppm
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1ppm-2ppm
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2ppm-5ppm
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1ppm
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2ppm
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TGas-1031-HCN
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0-30ppm
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5ppm-10ppm
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10ppm-15ppm
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5ppm
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10ppm
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TGas-1031-PH3
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0-1ppm
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0.3ppm-0.5ppm
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0.5ppm-0.8ppm
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0.3ppm
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0.6ppm
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Executed standards.(GB Standard is China National Standard)
GB12358-2006 Gas monitors and alarms for workplace——General technical requirements
GB3836.1-2000 Electrical apparatus for explosive gas atmospheres——Part 1 General requirements
GB3836.4-2000 Electrical apparatus for explosive gas atmospheres—— Part 4 intrinsic safety "i"
Explosion-proof mark: ExiaIICT3, it applies to 0 zone, 1 zone and 2 zone, the place that contains IIA-IIC category and T1-T3 group of explosive gas mixture, and is qualified to get explosion-proof conformity certificate through inspection by CQST.