INFICON 2020ComboPRO Portable Photoionization Detector - Manual (Page 100)

ISP-074-575-P1D 93 93
General Questions
Very low or no
instrument
response
detected, yet
compounds are
known to be
present The 2020ComboPRO has
not been properly
calibrated. Verify the concentration of the
span gas. Calibrate the
2020ComboPRO. See page
60.
Memory slots are not set
up correctly. Program the memory slots.
See page 61.
Response Factor has been
set to zero. Set Response Factor to 1.0 or
refer to Table 6 for correct
response factor.
Detector is leaking. Ensure the UV lamp is
correctly installed.
Ensure the lamp cover is tight.
Do not over tighten.
Ensure the O-ring seal on the
lamp cover is positioned
correctly.
UV lamp is the incorrect
size. Contact INFICON for correct
lamp.
Sampling environment is
extremely humid or it is
raining. Water vapor is not ionized by
the PID. Water vapor does
scatter and absorb light that
causes a higher or lower
reading. The 2020ComboPRO
has been designed to work in a
humid environment but you
may notice a decreased
response.
UV lamp is failing. Install a new UV lamp. See
page 84.
High concentrations of
non-ionizable compounds. Chemical compounds with an
ionization potential higher
than 10.6 eV or 11.7 eV scatter
and absorb UV light.
Sensitivity may be decreased.
Contact INFICON for more
information.