Land 4500 MKII Premier, Operation And Maintenance Manual

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Model 4500 Premier Dust and Opacity Monitor
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B3-7 Zero Point Reflector Adjustment
All instruments are shipped out from the factory configured to customers' requirements.
The following procedures should only be necessary if the optical path length or the
opacity standard has been changed. It is mandatory for installations complying with
USEPA regulations.
If in any doubt about these instructions, please contact Land Customer Services Department before
proceeding. Take care when handling the reflective surfaces as they can easily be scratched or made
dirty.
CAUTION
Do not attempt to ROTATE the zero point reflector by hand. The precision gearbox
will be irreparably damaged. See section B3-1 for identification.
1. Remove the instrument from the stack and set up on test stands positioned at the correct
flange to flange distance.
2. Press the Maintenance key for 3 seconds until the LED is illuminated. The system is unlocked
and allows parameter access.
3. Perform a Re-calibration (see section B3-3).
4. Display and make note of the 'B' value on the Parameters menu (see section B3-6).
5. On the table in Appendix A find the 'B' value (or the nearest lower value). The value may occur
in two columns. Select the Aperture Plate (horizontally) and the Grating (vertically) relating to
the 'B' value.
6. Install the selected Aperture Plate and Grating as described in this section.
Continue to step 7.