References - PerkinElmer Photovac 2020 Manual

NOTES: 1. Peak alarm levels have been established as the
TLV-Ceiling concentration, or the TLV-STEL
concentration in those cases where no TLV-Ceiling
value exists.
2. In cases where no STEL exists for a compound, the
STEL value has been established as equivalent to the
TWA value.
3. In cases where recommended exposure limits are below
the detection limit for the compound in question, the
estimated lower limit of detection has been substituted
for those values.
4. 2020 is not suitable for monitoring these compounds at
ACGIH recommended levels.
5. A 1000 ppm TWA has been established for those
compounds which are "Simple Asphyxiants", and for
which no exposure value exists.
6. For those compounds which lack established exposure
levels, an arbitrary value of 200 ppm has been
established for the TWA, STEL and PEAK alarms.

References

1. Maslansky, Carol J. and Steven P. Maslansky. Air
2. American Conference of Governmental Industrial
NOTE: The TLV/BEI™ publication is revised annually.
Monitoring Instrumentation. New York: Van
Nostrand Reinhold, 1993.
Hygienists. Threshold Limit Values for Chemical
Substances and Physical Agents and Biological
Exposure Indices (1994-1995). Reprinted with
permission.
Appendices
177