Specifications

2
Instruction 0019-9208
N
2
O Monitor 3010
1.3 Units of Measurement
The monitor’s LCD shows N
2
O concentrations expressed as either a
current (real time) ppm reading, or a time weighted average ppm value
displayed in either upper case (TWA) or lower case (twa).
The TWA/twa ppm value is calculated either over a set 8-hour period
(TWA), or over the total elapsed-time period that the monitor was
switched ON (twa). The method used to calculate TWA/twa is set in soft-
ware, and cannot be changed using the monitor’s front panel push but-
tons. Refer to Sections 2.6 and 2.7 for additional TWA/twa information.