SPM Single Point Monitor
SPM Technical Handbook
5-3
pipes or other items at these locations (low-restriction
bug screens are acceptable).
5.2.2 User Responsibility
The operating temperature range of the standard SPM
is 0°C to 40°C (32°F to 104°F). Options are available for
use outside of this standard temperature range.
The user is responsible for providing purge inlet air
temperature which will not let the internal temperature
of the enclosure fall outside of the SPM’s operating
temperature range.
Purge Supply
The typical purge supply gas is “instrument quality” air.
The air source for the purge system is to be free of oil
and liquid. Ordinary plant compressed air is normally not
suitable without the proper conditioning. Nitrogen gas
may be used for purge supply instead of compressed
air.
The compressor source of purge air is to be physically
located in a non-hazardous area. The air supply lines
from the compressor to the SPM should be made of a
non-combustible material.
See NFPA 496-1993 for additional information on purge
supply.
OFF ON
ALARM
TEST
ALARM
RESET
RELAY
DIS-
ABLE
SYSTEM
STATUS
ALARM
SPM
Single Point Monitor
MDA Scientific, Inc.
PPM0.0
1
0 3
2
50
15
51
52
53
5455
56
58
21
20
22
20
57
Legend
15. Sample inlet port 52. Atmospheric reference port
20. Cover screw 53. Purge outlet valve
21. Retaining ring 54. Purge pressure gauge
22. Collar xing screw 55. Override switch
50. Purge gas inlet regulator 56. Explosion proof switch
51. Exhaust port 57. Cable conduit
58. Pressure relief valve
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