PD
Meters and Accessories
Q
What is the proper method for adjusting the calibrator in my
PD meter?
A
If you are using
a PD meter with a manual readout, in order to maintain the highest degree
of accuracy, you need to adjust the meter's output so the manual readout
is correct. After completing the proving, use the following formula to
calculate the adjustment:
If the result is positive (+), adjust the calibrator by XX clicks clockwise.
If the result is negative (-), adjust the calibrator by XX clicks counter-clockwise.
Hint: When
adjusting the calibrator, always turn the adjusting stem 2 additional
clicks past the adjustment from the formula above, then 2 clicks back
to the desired setting.
Q
Is it possible to reverse the flow direction on a Smith PD
meter?
A
Yes, but there
are some limitations. To reverse the flow, you remove the drive gear from
the jackshaft, remove the idler gear from the idler shaft and install
the idler gear on jackshaft. After doing this, put the original jackshaft
gear on the idler gear shaft to keep it from becoming lost. Now you can
flow in the reverse direction, but still maintain the standard counter-clockwise
rotation of the output shaft.
There are
some limitations to this procedure. This procedure is only applicable
to meters in which the jackshaft gear and the bottom idler gear have the
same number of teeth. If the number of teeth are different, after the
change, your gearing percentage will be incorrect. There are other procedures
and limitations for different types of meters and other geartrains. For
further information, contact us.
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