f. To change from H Mode to G Mode, press G H Mode pushbutton switch
(1); verify display (2) indicates G Mode. WAIT may be displayed for several
seconds. When WAIT has disappeared, proceed. The three dots may also appear
following the mode change. Wait until the dots disappear.
g. Hold CAM 1/2 inch away and monitor object in G Mode.
h. If the operation of the CAM is in doubt at any time, the filtered
nozzle standoff should be removed and the protective cap assembly replaced on
the nozzle assembly. When the display has cleared down to one or zero bars,
the nozzle protective cap assembly is removed and a new filtered nozzle
standoff installed.
A confidence test is performed and monitoring can then
continue.
4.
CAM Operation 'DO Items'.
a. DO attach the nozzle protective cap assembly on the environmental
cap when CAM is in use to prevent the inside of the nozzle protective cap
assembly from becoming contaminated.
b. DO attach the nozzle protective cap assembly on the nozzle assembly
when:
(1) Preparing CAM for operation.
(2) Clearing CAM down.
(3) Preparing CAM for shutdown.
c. DO install a clean filtered nozzle standoff before monitoring with
CAM.
d. DO ensure that the filtered nozzle standoff is moved close to, but
does not touch, surfaces being monitored.
e. DO protect the filtered nozzle standoff from driving rain or snow.
f. DO install a clean filtered nozzle standoff if one in use becomes
contaminated or wet. Rain or condensation building up on the filtered nozzle
standoff may also rise to misleading readings.
It may, therefore, be
necessary to change the filtered nozzle standoff from time to time when
operating under these conditions.
Condensation is most likely to form when
the CAM is cooler than the surrounding air, especially in humid conditions
such as tropical zones.
g. DO establish areas of clean air.
CM 1301
2-14
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