11. Appendix
11. Appendix
51
11-2. Definition of terms
ACGIH
It stands for American Conference of Governmental Industrial Hygienists, an
institution to recommend a guideline for toxicity of materials.
ppm
Gas concentration indicated in the unit of one-millionth of the volume
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.
Alarm delay time
A function which temporarily suspends activation to prevent a false alarm caused by
noise from its outside.
Calibration
Find relationship of the readings, display values or setpoints with the actual values
by using the calibration gas.
Japan Society
for Occupational
Health
It is an institution to set and recommend a guideline for toxicity of materials in Japan.
Maintenance
mode
When maintenance is performed on the monitor, 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
monitor.
