ALTAIR 5X PID
72
PID Response Factor Table
US
10 PID Response Factor Table
For any compound, its exposure limit guideline can be recalculated in terms of equivalent ppm isobuty-
lene by dividing the exposure limit guideline by the appropriate response factor. Example: For
butyl acetate (CAS 123-86-4), the recommended threshold limit value (as TWA) is 150 ppm. Its
response factor (10.6 eV lamp) is 2.4. The TLV for butyl acetate, in terms of equivalent ppm isobuty-
lene is: 150 ppm ÷ 2.4 = 62.5 ppm isobutylene equivalent.
Gases with very high response Factors (RF):
The Altair5X PID is a very versatile solution for monitoring many different gases and vapors. In addition
to the pre-programmed list provided in the Altair5X PID device, users can determine response factors
for many other compounds (see Section X). The maximum response factor value that will be accepted
by the Altair5X PID device is 39.99.
Contact MSA Customer Service at 1-800-MSA-2222 with any question regarding the above informa-
tion.
WARNING
VOC Response factors apply in the 0-500 ppm range. The values in this table were obtained using
dry bottled gases at room temperature. The response factors may change at higher concentrations,
different temperature and humidity conditions, or with cleanliness of lamp. For increased accuracy
at different ambient conditions or concentrations, determine a custom response factor and enter it
via the Custom Gas page; see Chapter XX, Custom Gas Setup. These response factors are specific
to the energy of the lamp designated in the table. They are not valid for devices using PID lamps at
any other energy. Using these response factors with a lamp at any other energy may critically
compromise the device's ability to detect volatile organic compounds which can result in serious
personal injury or death.
WARNING
Use of Altair5X PID for detection of extremely toxic gases:
The system resolution limit of the Altair5X PID in normal mode (with a new, clean lamp) is approxi-
mately 0.1 ppm isobutylene equivalent. Users must be aware of exposure limit guidelines, such as
TLV, for the target compound. Do not use the Altair5X PID Detector if the exposure limit for the target
compound is below 0.1 ppm. Failure to follow this warning can cause over-exposure, which can
result in serious personal injury or death.
WARNING
The ALTAIR 5X PID Detector has a reproducibility of ±2ppm(± 2000 ppb) or 10%, whichever is
greater (see table in chapter 6.2).The user must account for this potential variation between the
displayed value and the actual concentration when setting alarms and interpreting readings. Failure
to comply with this warning can cause over-exposure and result in serious personal injury or death.
WARNING
Use the correct lamp when determining the response factor. Failure to apply the appropriate
response factors can result in inaccurate readings, and serious injury or death can occur.
COMPOUND NAME Display Name Synonym(s) CAS Number
1
Chemical
Formula
Ioniza-
tion
Potential
RF
10.6eV
lamp
acetaldehyde ETHANAL 75-07-0 C2H4O 10.23 10.8
acetone ACETONE 2-Propanone 67-64-1 C3H6O 9.71 1.2
acetophenone ACETPHEN 98-86-2 C8H8O 9.28 0.59
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