Fuji Electric ZSS-8 Series Instruction Manual page 34

4.11.2 When an optional optical axis adjusting tool (laser
pointer) is not used
(1) Connect the digital voltmeter using the BNC cable, referring to "4.6 Received light ".
(2) The reference light intensity is based on the output in zero calibration or voltage value of light intensity
which is described in a nameplate.
When the light intensity is completely zero V, move the transmitter box from side to side and up and
down slowly to find the position where the received light intensity increases. If you cannot still confirm
the light intensity, loosen the fixing bolts and nuts further, and check reaction of the digital voltmeter
while moving the box back and forth slowly.
(3) If you find reaction of light intensity increases, fasten the fixing bolts and nuts temporally, and perform
the operation in 2). (*4)
(4) If output is not as much as that measured at the time of calibration even if output is at its maximum on
the transmitter side, fix the box at the maximum output angle temporality and adjust the light axis,
moving the box on the receiver side similarly. When you can confirm the output at the time of adjusting
any of the boxes, do not loosen the fixing bolts and nuts too much, or the light axis can deflect further.
Do not loosen more than one bolt or loosen fixing bolt and nut widely in both cases of adjustment.
Light axis may deflect again.
(5) Move the transmitter unit and the receiver unit from side to side and up and down to adjust until the
voltage value of light intensity of digital multimeter becomes smaller in all directions.
(6) Retighten all volts to fix them (If the light intensity decreases at retightening, adjust again).
*4) Received light intensity might not increase to its maximum that was confirmed by "4.6 Received light "
due to the influences from dust and moisture in the stack.
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INZ-TN8ZSS-E