YOKOGAWA Vigilant Plant EXA TB Series, Руководство пользователя

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<7. MAINTENANCE>
7-12
IM 12E04A02-02E
7.12 Checking Flowrate (Water Level)
Checking the water level of the measuring cell by letting measuring water or "zero water" fl ow.
1. Select the <MAINT.> mode. Remove screw A under the detector cover to open the detector
(see Figure 7.1). Let each valve be set in the measuring status or the zero calibration status
(see Table 6.15).
2. Con fi rm that the measuring surface is like a mirror fi nish and, if the surface is rippled, adjust
the fl owrate of the measuring water or "zero water".
3. Check whether or not the over fl owing measuring water is approximately uniform at all parts
of the periphery of the cell. If there is a large deviation, make a horizontal adjustment for the
detector described in Subsection 4.1.4.
4. Check for dirt inside the detector and if necessary, clean it. If cleaning is performed, be sure
to calibrate zero and span.
5. Checking is fi nished by closing the detector.
6. Finished
The measuring surface is like a mirror finish.
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Figure 7.8 Measuring Water Surface
As shown in Figure 7.1, lift the detector cover and check whether the cleaning water fl owrate is
suf fi cient.
7.13 Operation If Water Supply is Suspended
If the supply of measuring water and tap water (cleaning water and "zero water") is suspended,
normal measurements cannot be carried out. The instrument cannot detect a suspension
of Sample and tap water (cleaning water and "zero water"). The water supply status should,
therefore, be checked regularly.
An automatic calibration failure (Err26) or an upper or lower limit alarm may be detected during
an interruption in the supply of measuring water and tap water (cleaning water and "zero water").
If such a failure is detected, check the supply of measuring water and/or tap water.
3rd Edition : May. 31, 2010-00