44-00-0297 SHERLOCK102/202 REV. 4.1 05-02-15
51
RECOMMENDED SETPOINTS
Refrigerant PEL (ppm) IDLH (ppm) 25% LFL (ppm) Alarm Level 1 Alarm Level 2
R-11 1000 5000 na 250 500
R-12 1000 50000 na 250 500
R-22 1000 50000 na 250 500
R-113 1000 4500 na 250 500
R-114 1000 50000 na 250 500
R-123 30 4000 na 30 200
R-134A 1000 50000 na 250 500
R-500 1000 50000 na 250 500
R-502 1000 50000 na 250 500
50 500 40000 50 250
Sherlock 2-SeriesUniform Mechanical Code Levels
Before using the table below of "Suggested Set-
points", it must be noted that different munici-
palities use different standards depending upon
local laws. Several Universal codes have pub-
lished recommended alarm levels
– ASHRAE 15-2010
– Uniform Mechanical Code
– International Mechanical Code
– Standard Mechanical Code
When calculating the setpoints for the Sherlock
control, the local code jurisdictions need to be
consulted. Some jurisdictions have modified the
Universal codes for their specific use. It is also a
good idea to consult the refrigerant manufactur-
ers Material Safety Data Sheet (MSDS) for Per-
missible Exposure Limits (PEL) and Immediate
Danger to Life and Health (IDLH) limits.
Alarm levels can also vary depending upon which
refrigerant is used. If your refrigerant is not listed,
check the manufacturers material safety data
sheet for PEL (also Allowable Exposure Limit)
(AEL)) and IDLH limits. Generally, safety group
A1 refrigerants (R11, R-22, R-134a, R-404a,
R-410A, R-507, etc.) have a PEL of 1,000 PPM.
Group B1 (R-123) and B2 (Ammonia, NH3) have
a much lower PEL.
The Uniform Mechanical Code table 11-A, from
which this table was constructed, which is simi-
lar to tables in the other recognized Universal
Codes and other code books states alarm levels
should be at no more than 50% and 25% of the
PEL.
If you have questions or concerns, contact Gen-
esis International technical support and we can
guide you further.
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