Riken Keiki SD-1D-AS, Operating Manual

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11 Definition of Terms
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11
Definition of Terms
Catalytic
combustion type
This is a principle of the sensor installed in the TYPE GP H.
See "10-2. Detection principle" for details.
New ceramic
This is a principle of the sensor installed in the TYPE NC H.
See "10-2. Detection principle" for details.
Initial clear
Output from the detector head fluctuates for a while after turning on the power.
This is a function to prevent triggering alarm during that time.
Full scale Maximum value of the detection range.
%LEL
A unit which the lower explosive limit (LEL) of the combustible gas to be detected is set
to 100.
ppm A concentration unit that means part per million of the combustible gas to be detected.
Calibration
Adjusts the readings to the calibration gas concentration value by using the calibration
gas.
Zero suppression A function to cut off the specific drifting that the sensor has.
Alarm delay time
A function which temporarily suspends activation to prevent a false alarm caused by
noise from its outside.
INHIBIT
The gas detection function is temporarily suspended during maintenance etc. of the
detector.
This is also called "point skip", which has the same function.
HART
communication DC4-20mA signal digitals signalling is superimposed, and is methods that transmit
multiple signals.