Appendix B
Definitions of Terms
The following defines terminology used in this manual that may
be unfamiliar to some users:
Zero: A zero (0) indication on the meter display indicates an
ambient air present, or no hazardous gases present.
Zeroing: The process of defining a zero condition on the display.
Span: An up-scale reading on the meter display
Spanning: The process of defining an up-scale reading on
the display.
SPAN Gas Value: The gas concentration which gives the
instrument an up-scale or full-scale value. This value is printed
on the cylinder containing the gas.
Exhaust Gas: The gas after it passes the sensor.
Flow Rate: The speed of the gas in the sample line.
Pump: An electromechanical device which moves the gas
sample to the Toxgard II instrument.
Upscale: Instrument alarms on gas concentrations greater than
or equal to the alarm value.
Downscale: Instrument alarms on gas concentrations less than
or equal to the alarm value.
Non-latching: Alarms reset automatically when the alarm
condition clears.
Latching: Alarm relays and indicator lamps remain active (after
alarm condition clears) until they are manually de-activated by
pressing the HORN/ALARM ACKNOWLEDGE button.
Appendix B, Definition of Terms
B-1
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