RKI Instruments GD-70D Series - Manual (Page 74)

Definition of Terms
GD-70 - 74 -
Definition of Terms
External Dust Filter When the 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 our sales department.
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 setpoints with the actual
values by using the calibration gas.
Maintenance Mode When maintenance is performed on the 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 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 obscure 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
detector.
This is also called "point skip", which has the same function.
Pyrolyzer Unit A unit to decompose gases under high temperatures. It pyrolizes special gases
under high temperature to make them detectable.