Riken Keiki GD-3EC, Technical Manual

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11. Appendix 11-2 Terminology
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11-2 Terminology
Term Definition
Initialization This function prevents alarms from being issued for a while after the power is
turned on.
This prevents alarms from being issued, as the output from the detector
fluctuates for a while after the power is turned on.
Full scale The maximum value of the detection range
Calibration This refers to the process of checking the product reading against a calibration
gas.
The process includes adjusting the product reading to match the concentration
of the calibration gas.
Zero suppression This function is used to hide (suppress) reading fluctuations below a set lower
limit to minimize sensor output fluctuations not caused by gas, such as
temperature and humidity fluctuations and noise effects.
Alarm delay time This function temporarily suspends immediate alarm activation to prevent false
alarms caused by external noise, even if the reading reaches an alarm setpoint.
Inhibit
This function pauses gas detection—for example, when the product is
undergoing maintenance. It is also sometimes referred to as point skipping.
% Unit used to express the percentage of a target gas contained in a given
volume
ppm Unit used to express the parts per million of a target gas contained in a given
volume
%LEL Unit for combustible gases in which the lower explosive limit (LEL) of the target
gas is set to 100 % (Example: For methane, 5 % concentration by volume
corresponds to 100 %LEL.)