AUX E&H Series Instruções de Operação Página 77

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8.6 Corrective maintenance of measuring system
8.6.1 pH/redox transmitter
Cleaning the front panel
To clean the front panel, only use standard
cleaning agents.
The front panel is resistant to the following
cleaning agents (acc. to test methode
DIN 42 115):
Isopropanol
Thinned acids (3 %)
Thinned alkalis (5 %)
Ester
Hydrocarbons
Ketone
Household cleaners
Caution!
Do not use any concentrated mineral
acids or alkalis, benzyl-alcohol,
methylene chloride or high-pressure
water vapour at over 100 °C.
8.6.2 pH/mV electrodes
Clean soilings on the glass electrodes as
follows:
Clean oily and greasy coatings
Clean with detergent (fat solvent,
e.g. alcohol, acetone, poss. detergent).
Warning:
Hands, eyes and clothes are to be
protected when using the cleaning
agents described below.
Limestone deposits or metal hydroxide
coatings
Loosen coatings with diluted hydrochlorid
acid (3 %), then rinse thoroughly.
Coatings containing sulphide (from flue
gas desulphurising plants or sewage
treatment plants)
Use mixture of hydrochlorid acid (0.5 %)
and thiourea (8 %), then rinse thoroughly.
Coatings containing protein (food industry)
Use mixture of hydrochlorid acid (0.5 %)
and pepsin (1 %), then rinse thoroughly.
Blocked diaphragms can under certain
circumstances be mechanically cleaned
(does not apply for teflon diaphragms and
open ring junction electrodes):
Use a small key file
File in one direction only
Air bubbles in the electrode
Air bubbles may indicate an assembly
problem; check installation position
The range from 15° to 165° from the
horizontal is permissible
Horizontal installation or installation with the
plug-in head pointing down is not allowed
Redox electrodes
Careful mechanical cleaning of coated metal
pins or surfaces is possible.
8.6.3 Assembly
Please refer to the operating instructions for
the assembly in question for maintenance and
troubleshooting instructions. The operating
instructions also include instructions for
assembly and dismantling, sensor and gasket
replacement as well as information on
resistance, spare parts and accessories.
8.6.4 Liquid KCl supply
KCI must flow without bubbles.
Unpressurised version: cotton thread
present?
For counterpressure: pressure in KCl
reservoir must exceed medium pressure
by at least 0.8 bar.
KCl consumption should be low but
noticeable. Approx. 1 ... 10 ml per day is
typical.
Refill opening of sensors with KCI refill
opening on glass shaft must be open.
>15° >15°
PM253E08.CHP
Liquisys M CPM 223 / 253 Diagnosis and corrective maintenance
Endress+Hauser 75
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