O p e r a t i o n s a n d I n s t r u c t i o n M a n u a l
43
S A G E M E T E R I N G , I N C .
REV. 03-SIE/SRE
1
Keypad is best to use, since the milliwatts is in real time (it continuously changes). You can use laptop,
if necessary, but Menu 505 (RTD Power) is just a "snapshot" of the milliwatts. Nevertheless, the laptop
can be used, if more convenient.
2
Sage "zeros" the meter in a horizontal pipe. If you have a vertical pipe, mW will be slightly lower
at zero (also see note 4).
lowing factors: gas composition, pressure, dirt,
non-zero conditions, and sensor orientation.
Any of these factors can have an effect on the
mWo (mw zero). It is a very sensitive data point
and that is why it is such a good check.
11. Note, if all of the above factors were remedied,
it would be expected that the mW zero would
report less than or equal to 5 milliwatts.
12. Note, in some cases, contamination of the sensor
is the only cause of the additional heat transfer
during the “no flow” test. Remove the probe,
and clean the sensor (use an appropriate non-
corrosive solvent to remove the build up). A soft
brush can be used to gently clean the sensing
surface, using caution to avoid damaging the
sensor elements (the RTD's).
13. In summary, if a technician in the field were
able to simulate Sage calibration conditions, he
too would find that the mWo would be within
one mW or very close to that. Since this is not
always possible, we are finding that after con -
sidering all of the field variables, a mWo in the
field that is within 10 mW is an acceptable
value. This would allow for a check to be done
in the pipe under application conditions.
14. Note, if desired, a second check can be conduct-
ed as well but using ambient air: This validation
method requires that the sensor be removed
from the pipe and inserted in a container such as
an empty plastic water bottle. We would recom-
mend this second check if there is any question
at all about the first check (while in the pipe) or
if it’s mWo value approaches 10 mW. The sensor
should be removed from the pipe, cleaned, and
inserted vertically into a clean dry container
such as a water bottle. This would allow a field
check very similar to the air mWo check that is
done at Sage, and more than likely will give the
same results that we recorded here at Sage.
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