157 Appendix D
Frequently Asked Questions (FAQs)
EVM Series User Manual
PID Questions (for Volatile organic compound measurements)
1. Measuring range and
display
The difference between Accuracy and Resolution is as follows: (1) Actual
accuracy, resolution, and repeatability are related to the full operating range
from 0 to 2000 ppm; (2) Resolution, also called the Display Resolution, will
display 0.01 resolution when less than 20 ppm. (This is due to TSI’s ability to
program a low-noise sampling system that provides 18-bits of resolution with
stable zeroing results. Thus, the display resolution appears as 0.01 compared
to other brands which display 0.1.)
Accuracy: ± 5% (± 100 ppm)
Display Resolution – ±2% repeatability (± 40 ppm)
2. What lamps will be
available? (9.8, 10.6,
11.7 eV)
The EVM PID sensor supports a 10.6eV lamp.
3. Will we offer a moisture
trap or hydrophobic filter
attachment?
Each gas sensor installed in the EVM, including PID, has a hydrophobic filter
contained in the sensor housing.
4. Is the lamp field
replaceable?
The PID lamp can be replaced by the user in the field. A replacement lamp can
be ordered from TSI (Part number 074-081). See Chapter 7 (Maintenance &
Cleaning) for instructions on replacing the PID lamp. NOTE: You need to
recalibrate the PID sensor after the lamp is replaced (or cleaned).
5. Can the lamp be cleaned
in the field?
The lamp can be cleaned in the field with the PID cleaning kit. A PID cleaning
kit is shipped with an EVM unit if ordered with a PID sensor option. A PID
cleaning kit can also be ordered from TSI (Part Number 074-080). See
Chapter 7 (Maintenance & Cleaning) for instructions on cleaning the PID lamp.
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