MAC155 Rev. 12 ©Copyright MAC Instruments 2005. All Rights Reserved.
Pg 6
CASE COOL
The case cool option uses the same compressed air source as the blow back
option. A temperature sensor inside the MAC155 Probe operates a solenoid
valve that releases air into the case of the probe. The hot air inside the case is
expelled through a vent to maintain the internal temperature at a safe level.
The MAC155 Probe is rated for a maximum ambient air temperature of
130ºF, with no radiation from a hot stack or duct, and with no direct mid-day
sunlight.
If the probe is mounted near hot surfaces or in direct sunlight, the case cool
option should be implemented.
This option requires the user to supply a source of 10 psi (69kPa) clean, dry
and oil free air into the 0.170” barbed hose fitting on the MAC155 case, see
figure 3.
FILTER BLOW BACK
The MAC155 Probe is protected from particle build up by a 10 micron filter
element. This option allows air to be injected into the barrel to clean the filter.
The blow back option can eliminate the need to manually clean the filter by
passing a burst of air in the reverse direction through the filter.
This option requires the user to supply a source of 10 psi (69kPa) clean
, dry
and oil free
air into the 0.170” barbed hose fitting on the MAC155 case, see
figure 3.
A burst of one second duration is sufficient to clean the filter. The cleaning
burst occurs automatically when ever the MAC155 is placed in the calibration
check mode.
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