Terminology - MSA Ultima X Instruction Manual

Terminology

ELECTRO-CHEMICAL SENSOR -
Sensor employing the reactions of chemicals generating electric
currents to detect certain gases.
EXHAUST GAS - Gas after it has passed through the sensor.
FLOW RATE - The volume-per-minute of gas in the sample line.
SPAN - Full scale or up-scale reading on the meter display.
SPAN GAS VALUE - Gas concentration which gives the instrument an
up scale or full scale value. This value is usually printed on the gas
cylinder containing the gas.
SPANNING - Process of placing a full scale or up scale meter reading
on the display by using calibration span gas cylinders.
ZERO - A zero (0) indication on the meter display usually indicates
ambient air present or no hazardous gases present.
ZEROING - Processes for placing a zero indication on meter display.
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