Instruction Manual
IM-105-4000, Rev 1.3
October 2008
6-3
OPM 4000
8. With the fine adjustment (large knob), adjust the zero jig until the opacity
reading is 0-1%. Lock the fine adjustment.
9. Place high opacity filter (for best results at least an 0.8 OD) in the slot
provided in the zero jig.
10. Adjust the span potentiometer (PT-3 Span) until the opacity value on the
service module opacity display is equal to the filter’s correlated value.
See Section 5: Zero Jig and Neutral Density Filters, for filter correlation
formulas.
11. Remove the filter and adjust the zero potentiometer PT-1 Zero for 0-1%
opacity.
12. Repeat steps 9 through 11 until the displayed opacity values are within
0.5% opacity.
13. Remove the zero jig on-line test reflector and replace the transceiver
cover and secure the transceiver in place. You must complete Zero
Reflector Adjustment procedure next.
ZERO REFLECTOR
ADJUSTMENT
Once the clear on stack zero and span calibration has been performed, the
zero reflector needs to be adjusted according to the following procedure.
1. Find and record the zero offset value found in the QUICK MENU under
Zero Cal Value, see "Zero/Span Calibration Check" in Section 3: Startup
and Calibration, for procedures to access the quick menu.
2. Place the OPACITY/T
2
switch on the service module in the OPACITY
position to observe the correlated opacity on the digital display.
3. Swing open the transceiver.
4. Place the ZERO switch on the service module in the ZERO position.
This will raise the zero reflector into place. After 30 seconds observe
and record the zero value.
5. Return the mirror to the normal resting position by returning the ZERO
switch to the OPERATE position.
6. Insert a 1/16 in. Allen wrench into the adjustment set screw located on
the top of the zero reflector (Figure 6-1). Turn the set screw clockwise
1/8 turn.
7. Remove the Allen wrench and place the ZERO switch in the ZERO
position. After 15 seconds make sure the reading is moving toward the
desired value. (If value is moving away from the desired value, repeat
step 6 and turn set screw counterclockwise).
8. Repeat steps 5 through 7, each time making small 1/8-turn increments
until the desired value is reached.
9. Cycle 2 to 3 times more and wait 15 to 20 seconds between cycles to
ensure repeatability.
10. Record the final value; enter it into the Zero Cal Value in the QUICK
MENU.
11. Swing transceiver into operate position and secure in place.
Summary of Contents for Rosemount Analytical OPM 4000
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