DF-8500 C Point type combustible gas detector with measuring range of 0~100%LEL
The device is factory-calibrated and delivered ready for installation. First
calibration is required after installation.
4.1 Startup
The device conducts self-checking during it starts up and sets the operating current
as output signal (default: 4.0mA), then displays below information:
Display testing
After power on, all segments on the display light, LED indicators are turned
on one by one as the sequence: green->red->red->yellow, and after all the
LED indicators light, the green LED starts to flicker.
Firmware version
The screen displays the firmware version.
Sensor type
COMB means what detected is combustible gases.
Measuring range
100, displayed on the screen means the measuring range is 100%LEL.
Alarm operation value
The display shows the preset alarm operation value. E.g.25 and 50 stands for
25%LEL and 50%LEL respectively.
Countdown
The screen displays the countdown of sensor’s stability.
Normal operation
After countdown, the screen displays the gas concentration.
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