Ametek Land 4500 MKIII, User Manual

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B - 31
Model 4500 MkIII Opacity and Dust Monitor
User Guide
Immediately after a genuine clear stack re-calibration perform the following
steps for re-calibration of the EZD.
1) Fit the EZD as shown in the photo.
2) Ensure that the instrument is set to display negative values and then
observe the measurement reading.
3) Loosen the locking nut on the sliding adjusting plate and slide the plate
until the instrument is measuring zero.
If the instrument cannot be set to measure zero opacity by adjusting the
sliding adjuster on the back of the EZD, it is necessary to change the
aperture and grating that cover the reflective surface.
If the black wedge shape on the front of the sliding adjuster on the EZD
completely covers the reflective surface then replace the current aperture
plate and grating with the ones corresponding to the next highest ‘B’ value
(i.e. Next highest ‘B’ value 0.97 corresponding aperture plate C and grating
2). Refer to Table B1 opposite.
If the black wedge shape on the front of the sliding adjuster on the EZD
cannot be seen then replace the current aperture plate and grating with the
ones corresponding to the next lowest ‘B’ value (i.e. Next lowest ‘B’ value
0.91 corresponding aperture plate E and grating 2).
4) Lock the sliding adjusting plate in place.
IMPORTANT
Once calibrated to an instrument, the EZD should not be adjusted
unless undergoing another re-calibration.
5) Remove the EZD. Store the EZD in the carry case provided until
required for Re-calibration.
6) Close the Transceiver casing.
The instrument is now ready for normal operation.