En Instruction Manual - Mettler Toledo 465 Serie Betriebsanleitung

en
8
General instructions
For all type 465 combination pH electrodes
For all type 465 combination pH electrodes to be mounted
into the following housings: types 763, 764, 776 and 796.
We recommend that the sensor may only be in operation
with the original accessories from METTLER TOLEDO. The
sensor may be operated and serviced only by personnel
familiar with the unit, and who have read and understood
this instruction manual.
1 Installation
a W hen unpacking, check electrode for possible mechanical
damage to the pH sensitive glass, the diaphragm or the
body. Electrodes subject to complaints must be returned to
us or to our agent in the original box indicating the invoice
number.
b Take off watering cap and wash the electrode tip with distilled
water. After rinsing with distilled water, dab the electrode with
a tissue. Do not rub as an increase of the response time
might result.
c Important: Reference electrolyte filler tube: The T-shaped
rubber stopper as well as the elastic securing band ha-
ve to be removed completely from the electrode, before
inserting the electrode into the housing. Remove any KCl
solution residing in the filling port. Re-assemble the housing
as described in the instruction for the housing.
d Eliminate any air bubbles trapped behind the pH sensitive
glass by smoothly swinging the unit in the vertical plane.
The lead-off element of the glass electrode must dip into the
inner buffer solution without air bubbles.
e Combination pH electrodes stored dry for several days have
to be soaked in the appropriate storage solution for several
hours before use. It is recommended to store combination
and reference electrodes in the reference electrolyte solution.
f After a long and dry storage period, the pH sensitive glass can
be reactivated with hydrofluoric acid (order no. 51 319 053):
The electrode membrane is dipped for 1 min. in this solution
followed by rinsing with distilled water and soaking for
12 hours in the storage solution.
g Checking electrolyte level: Combination electrodes of the type
465 contain various electrolytes. For refilling always use the
type of electrolyte indicated on the body of the electrode. The
imprint «refill 9816» means to refill with Viscolyt (order no.
51 340 235); «refill 9848» means to refill with Friscolyt-B
(order no. 51 340 053).
The liquid level of a properly filled electrode is about 1 – 2 cm
below the filling port.
2 Calibrating of electrode and pH transmitter
The transmitter is calibrated using the electrode either ready
for mounting or already mounted into the housing. Calibra-
tion is made in two buffer solutions of a known pH value by
dipping the electrode into the buffer and adjusting the pH
transmitter. For further studies in pH measurement the follo-
wing booklet is available free of charge: «pH Theory Guide»
(order no. 30 078 149). For other language versions please
contact your Mettler-Toledo representative.
© 04 / 16 Mettler-Toledo GmbH
59 905 937
Type 465 pH Electrodes
Type 465 pH Electrodes
Printed in Switzerland