YOKOGAWA EXA TB TB400G, User Manual

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<7. MAINTENANCE>
7-10
IM 12E04A02-02E 9th Edition : Mar. 16, 2018-00
(6) Connect the standard solution tank to the measuring water feed inlet and supply the
standard solution at 2 L/min using a pump. Supply the standard solution agitating it with a
magnetic stirrer.
(7) When the standard solution begins to overflow the measuring cell, stop supplying the
standard solution by turning off the pump, and drain it off by opening the drain value. Then
close the drain valve and again supply the standard solution.
(8) Allow the standard solution to flow for 4 minutes or more and after the reading stabilizes,
carry out span calibration. For the operating procedure, see Section 6.5 (4).
(9) After calibration is completed, stop supplying the standard solution and drain it.
Reconnect the measuring water piping and restart the supply of measuring water. It takes a
certain time until the detector, heater tank, and piping are completely filled new measuring
water.
(10) Select FUNCTION "D." in the <PROGRAM1> mode and return the setting to "ON".
(11) Finished.
7.8 Cleaning of Lenses
(1) Select the <MAINT.> mode and turn off the power switch.
(2) Loosen screw A under the detector cover and open the detector (see Figure 7.4).
(3) Check whether or not the lenses in the detector (see Figure 7.4) are dirty. If they are, wipe
them using, e.g., an applicator. In this case, it is better to soak the applicator in alcohol.
(4) After cleaning the lenses, carry out zero and span calibrations.
(5) Finished.
F0705.ai
Screw A
Lenses
Figure 7.4 Lens Positions