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??JCB4Portable?methane?detection?alarming?device

??JCB4

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Description

Introduction&Application?
A?kind?of?technology?by?single?chip?microcomputer?intelligent?instrument.?Completely?according?to?AQ62072007?portable?carrier?catalytic?methane?detection?alarming?device,?design?and?production.?Mainly?used?in?portable?monitoring?of?coal?mine?methane?gas?concentration?in?the?workplace.?Alarming?device?display?without?the?single?chip?microcomputer?artificial?adjustment,?can?show?the?methane?concentration?below?0.1%?CH4.With?sound?and?light?alarm?is?alarming?device?self-checking?function?and?emergency?alarm,?battery?voltage.On?methane?concentrations?over?measurement?range?limit,?alarming?device?has?the?function?of?protecting?carrier?catalytic?element?and?are?keeping?the?alarming?device?display?value?transfinite?state
?Alarming?device?of?the?battery?has?no?& quot;memory?effect& quot;?of?nimh?batteries.
Alarming?device?with?a?power?supply?voltage?display,?under-voltage?hint,?under-voltage?automatic?shutdown?function.
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Technical?parameters:
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Measuring?range:0.00~4.00?%CH4
basic?error:
0.00~1.00?%CH4???±0.10%CH4
1.00~3.00%CH4???±10%
3.00~4.00%CH4???±0.30%CH4
Alarming?device?battery?normal?charge?after?the?working?hours?are?not?less?than?12?h.
Response?time?(T90)?alarming?device& acute;s?response?time?is?not?more?than?20?s.
?
Alarm?function
Alarming?device?can?be?within?the?scope?of?CH4?0.50%?~?0.50%?CH4?and?arbitrarily?set?the?emergency?alarm?and?alarm?display?value?and?the?value?of?the?error?is?not?more?than?plus?or?minus?0.05%?CH4.?.
Alarming?device?sound?intensity?from?the?1?m?distance?not?less?than?75?db?(A);?Optical?signal?visibility?of?not?less?than?20?m?in?the?dark.

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