YOKOGAWA PUS400G, Руководство пользователя

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< 4. Inspection and Maintenance >
4-1
IM 19C1B3-01E
4. Inspection and Maintenance
This chapter describes routine inspection and maintenance work required to allow the PUS400G
ultrasonic oscillator to fully deliver its performance and to obtain favorable cleaning results.
Refer to “5. Troubleshooting” in this manual for the improvements of the equipment preventing the
achievement unfavorable cleaning effect and the remedies for troubles in the equipment.
4.1 Inspecting State of Ultrasonic Wave Application
If ultrasonic wave application does not have sufficient cleaning effect, it is impossible to accomplish
the purpose of ultrasonic cleaning of maintaining accurate pH measurement for a long time. Check
whether the ultrasonic oscillator is normally operating whenever maintenance work is performed on
the pH meter.
4.1.1 Checking State of Ultrasonic Oscillator Operation
During pH measurement, check to see that the ultrasonic oscillator is satisfactorily operating as well.
To do this, check whether the in-action pilot lamp inside the oscillator is ON.
If not, perform maintenance work in accordance with the instructions described in Section 4.2.
4.1.2 Checking Cleaning Effect
Visually check the cleaning effect on the pH sensor whenever maintenance work (Standard solution
calibration, etc.) is performed on the pH meter. If soil on the glass electrode area and the fluid-
contacting area is not so prominent as compared with the other parts, the effect of ultrasonic cleaning
is satisfactory.
NOTE
Measurement errors are caused by the chemical contamination of the sensitive film on the glass
electrode as well as the adhesion of contaminants contained in measurement fluid. Refer to the user’s
manual for the pH meter for the removal of soil insusceptible to ultrasonic cleaning, such as chemical
contamination.
If any adhesive contaminant, such as those contained in measurement fluid, is sticking to the fluid-
contacting area (especially, vibrating surface) of the ultrasonic vibrator, remove it; otherwise, the
cleaning effect is impaired.
If any adhesive contaminant is contained in measurement fluid, take necessary measures to prevent
soil sticking to the ultrasonic vibrator from being hardened (dried) when the ultrasonic oscillator is out
of operation.
The fluid-contacting area of the ultrasonic vibrator is made of a material resistant to the corrosion
due to measurement fluid (SUS316, Hasteroy C or titanium; in most cases, a problem associated
with corrosion will not come up. If any change in the properties of measurement fluid (change in
constituents, etc.) is encountered, check for corrosion (pitting, etc.) for precautionary purposes. If
corrosion develops so far that fluid begins to enter the interior of the ultrasonic vibrator, it may be
required to replace other parts together with it.