Specifications

Maintenance
Sensor Photocell Zeroing 6
6-13
3. Enter the Zeroing screen by selecting MENU | CALIBRATE.
4. Select the Primary sensor by pressing the Sensor [F6] key until the word Primary is
displayed above the calibration coefficients.
5. Select Zero [F1]. Do NOT press the Calibrate button.
6. Select the Mechanical Zero [F1] key.
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Figure 6-6. Photocell Zeroing Menu
7. Refer to Figure 6-9, slightly loosen the Allen screw on the back of the sensor bracket,
making sure to maintain a snug fit on the screw. Using the T-shaped Photocell
Centering Tool (part number 7250-111), adjust the photocells by placing the tool in
the hole in the back of the sensor and turning the tool slightly. The screen will show a
number of horizontal lines. The top yellow bar represents the current zero setting.
The bottom portion of the bar has a green bar in the center and two red bars on either
end. If the top yellow bar is over the red bar, then mechanical zeroing is required. If
the yellow bar is over the green bar, then no adjustment is required.
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Figure 6-7. Centering the Photocell
8. Adjusting the photocell will cause the yellow bar to reduce in width. You want to
adjust the photocell until the yellow line is as thin as possible over the green bar.