158 Appendix D
Power
EVM Series User Manual
6. How do we calibrate the
PID?
A PID calibration is a two point calibration consisting of a zero and a span
calibration. The flow rate at L/min is recommended for best performance
results (i.e., accuracy and repeatability). To perform a zero calibration Pure Air
or Nitrogen should be used. To perform a span calibration Isobutylene gas
should be used if the specific VOC is unknown or a specific VOC gas can be
used. To calibrate the PID sensor navigate to the CALIBRATION\PID screen
and perform a zero and span cal by applying gas to the monitor using the
supplied calibration cup. See Chapter 4 for details on PID calibration.
7. How often is calibration
recommended?
TSI recommends calibrating the PID sensor prior to running a log session to
adjust for sensor drift and wear.
8. Do you have a correction
factor chart (or a library of
PID correction factors) for
various VOCs?
TSI has included a correction factor chart with the various VOCs in
Appendix C. Please reference as needed.
Cleaning/Maintenance Question
9. How do I know when to
clean/perform
maintenance with the PID
sensor for VOC
measurements?
(1) Replace the electrode pellet if the baseline climbs after performing a zero
calibration. (2) Replacement of the electrode is needed under high humid
conditions. (3) Cleaning is needed if the baseline is unstable or shifts when you
move the PID sensor.
Power
1. How long will the battery
last with the EVM series?
The battery is an internal lithium-ion rechargeable battery pack which will last
at least 8 hours with continuous setup time, run time, and viewing your results
time. (NOTE: The battery is not user accessible or user replaceable.) Battery
life-time is estimated at 500 charge cycles or around 3 years of use before you
will need to replace the battery pack.
Alarm Outputs
1. Is there an alarm output?
The Digital-Out (or digital-output) can be configured for any installed sensor at
user specified threshold.
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