Cal Zero Reflector Adjustment - EMS EMS520 Manual

CAL ZERO REFLECTOR ADJUSTMENT

After a clear or off stack zero has been performed the zero reflector needs to be adjusted.
1. Find and record the zero offset value found in the
Tech Setup, Tech Setup Screen 1, "Zero Cal Value".
2. On the SSM observe the correlated opacity on the
digital display.
3. Swing open the transceiver.
4. Initiate a zero with the F1 button on the SSM to raise
the zero reflector into place. Observe and record the
zero value after 30 seconds. Press the F1 button until
the zero reflector returns to its resting position.
5. If required, insert a 1/16" Allen wrench into the
adjustment set screw located on the top of the zero reflector. Turn the set screw clock-wise 1/8 turn.
6. Remove the Allen wrench and initiate a zero (step 4) and after 15 seconds observe the reading is moving toward the
desired value. (If value is away from desired repeat step 4 turn set screw C.C.W.)
7. Repeat steps 4 -6 each time making small 1/8-turn increments until the desired value is reached. Cycle 2-3 times
more waiting 15 to 20 seconds between cycles to assure unit repeats desired value +/- 0.5% Opacity. Swing
transceiver into operate position and secure in place. Record the zero final value.
F1 This display will change
each time you push the
F1 button displaying the
mode the system is in.
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