Riken Keiki SD-1RI, Operating Manual

Page: 56 / 57

11 Definition of Terms 11 Definition of Terms
- 53 -
11
Definition of Terms
Non-dispersive
infrared type This is a principle of the sensor installed in the detector head.
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.