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DESCRIPTION
Manufacturer: INDUSTRIAL SCIENTIFIC-OLDHAM
Function: Multi-risk gas detector
Type : BM25
Configuration:
• One to four sensors (explosive, electrochemical, infrared (CO
2
) or catharometric sensors)
Gases detected: Explosive gases, toxic gases and oxygen
Measurement: Continuous on all sensors in operation
Sensors:
• Intelligent, precalibrated, interchangeable units
• Automatic recognition by the BM25 by means of EEPROM
Display unit:
• Graphic LCD
• Messages in uncoded mode, with backlighting
• “Flip-Flop” function
Display lighting : With time switch upon request, automatic for alarm or fault
Switching of explosive ranges
• Automatic, from "% Gas" scale to "% Volume" scale
Sensor faults
• Indication by indicator light
• Message in uncoded mode
• Corresponding display "frozen". Other channels operational
• Continuous general audible and visual alarm
Battery fault
• Display in uncoded mode
• Continuous general audible and visual alarm
Operating check
• Self-test on power-up
• Visual signal every 2 minutes (factory)
• Display of measured values in uncoded mode
Alarms
• Explosives: 2 adjustable instantaneous thresholds in 0-60 % LEL range
• Oxygen metering: two adjustable instantaneous thresholds over the sensor's whole
measuring scale (over-oxygenation and under-oxygenation) or two optional under-
oxygenation thresholds.
• Toxic gas metering (by sensor)
- Two adjustable instantaneous thresholds over the whole range
- one TWA threshold
- one STEL threshold
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