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Instruction Manual
IM-105-3000, Rev 2.0
November 2008
Figure 3-3. Zero and Span
Adjustments
PT-3 (Span)
NOTE
If attempting an alignment without the optional zero jig please call our
Customer Support Center at 1-800-433-6076.
5. Swing open the transceiver and attach the zero jig by placing it on the
alignment pins and secure it to the transceiver with the thumb screw.
6. Adjust the zero jig with the large knurled adjustment knob until the 4-20
mA output reads 20 mA, this simulates a zero % opacity condition. Lock
the knurled adjustment knob in place.
7. Place a span filter of at least 80% in the slot provided in the zero jig.
8. Adjust PT-3 (span) on the R/M signal processor board until the 4-20 mA
output reads the value calculated using the equation:
The 4-20 mA output must match the calculated value within ±0.04 mA.
9. Remove the zero jig and store in a safe place.
If at any time you need to check the clearance across stack zero, install
the zero jig. Because the zero jig was set during initial calibration it can
be used to re-establish the across stack zero even if the source is
running.
10. Initial calibration of the unit is complete. Reconnect any wires
disconnected during this procedure and replace the cover. Clamp the
cover securely in place.
OPM 3000
PT-1 (Zero)
3-5
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