Page 38 Chapter 5 — Maintenance and Troubleshooting
1. Clean the mirror as described earlier in this chapter. Make
sure you replace the sensor cover when checking the balance.
If no bars are lit or more than one bar is lit, go to Step 2. If one
bar is lit, go to Step 3.
2. If no bars are lit, turn the balance screw on the sensor
COUNTERCLOCKWISE until only the bottom bar is lit.
If more than one bar is lit, turn the balance screw CLOCK-
WISE until only the bottom bar is lit. (For the adjustment
screw, see Figure 6 on page 14.)
Be sure to cover the mirror cavity while adjusting the balance
screw, since ambient light can cause an offset.
3. The sensor is balanced when one bar is lit. Replace the sensor
cover, if necessary, and make sure one bar is still lit. If not,
repeat Step 2, since you were allowing some light to enter the
cavity. Place the Sensor switch back to OPERATE to stop heat-
ing the mirror.
4. Initiate a Pacer cycle by switching the Balance switch to INIT.
At the completion of the cycle, the Humilab Chilled Mirror
Hygrometer System is properly balanced. Figure 13 on the
next page diagrams the complete balancing procedure.
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