11. Definition of Terms
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11.
Definition of Terms
External dust filter
When the gas detector is used in a dusty environment, it is recommended that a
dust filter should be attached to its outside. The filter is specified based on the
gas to be detected. Please contact RIKEN KEIKI.
vol%
Gas concentration indicated in the unit of one-hundredth of the volume
ppm
Gas concentration indicated in the unit of one-millionth of the volume
ppb
Gas concentration indicated in the unit of one-billionth of the volume
Calibration
Find relationship of the readings, display values or setting values with the actual
values by using the calibration gas.
Maintenance mode
When maintenance is performed on the gas detector, the alarm contact is
disconnected, and a signal to indicate the maintenance mode status is sent out to
the external output signal. As a result, maintenance can be performed on a single
unit of the gas detector.
Initial clear
The reading is unstable for seconds after the power is turned on. To prevent
malfunctions for that period, the alarm contact is deactivated. In addition, a signal
to indicate the initial clear status is sent out to the external output.
Zero suppression
A function to cut off the influences of environmental changes, interference gases,
etc.
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 gas detector.
This is also called "point skip", which has the same function.
Pyrolyzer
A unit to decompose gases under high temperatures. It pyrolyzes special gases
under high temperature to make them detectable.
