Toxalert Tox-Refrig/ANA - Manual (Page 2)

*REFRIG. *SAFETY TLV AEL PEL
ID# CLASSIF. (PPM) (PPM) (PPM) IDHL
R-11 A-1 1000 1000
R-12 A-1 1000 1000
R-22 A-1 1000
R-113 A-1 ***C1000
R-123 B-1 30 1000
R-134a A-1 1000 1000
R-142b A-2 1000
R-152a A-2 1000
R-500 A-1 1000
R-502 A-1 1000 1000
**R-717(NH
3
)
AMMONIA B-2 25
Also paragraph 7.4.2, Rules:
“(d) detectors (refrigerant, oxygen, etc.) are located in area where refrigerant vapor leak will be concen-
trated so as to provide warning at a concentration not exceeding the refrigerant(s) TLV-TWA (detectors
are not required for ammonia due to its self-alarming character);”
&
“(f) when the quantity of refrigerant, expect Groups A1 and B1 and ammonia exceeds Table 1 quantities,
the area shall be classified as a hazardous location and all electrical equipment shall conform to the
requirements of Class 1, Division 2, of the National Electrical Code. 9.”
Because of the requirements in Rule 3(f), all of Toxalert’s refrigerant sensors are supplied in an
explosion proof housing.
TABLE #1
* The Refrigerant designation number and Safety Classification are from ANSI/ASHRAE
Standards 34-1992.
** Toxalert has Ammonia Sensors to monitor for ammonia refrigerant (model TOX-NH
3
/ANA).
*** The concentration that should not be exceeded during any part of the working exposure.
TLV - Threshold Limit Value, established for industrial chemicals by American Conference of
Government Industrial Hygienists, is the time weighted average concentration of an airborn
chemical to which nearly all workers may be exposed during an 8 hour day, 40 hour week without
adverse effect.
TOXALERT INTERNATIONAL, Inc., PO Box 159, Mound, MN. 55364 PHONE: (952) 472-4541 • FAX: (952) 472-4960
www.toxalert.com