En Instruction Manual - Mettler Toledo 405-DPAS-SC Manual De Instrucciones

en
8
Instructions for Type 405-DPAS-SC
pre-pressurized gel-reference pH Electrodes
1 Introduction
The METTLER TOLEDO Type 405-DPAS-SC combination
pH electrode is a low-maintenance, pre-pressurized,
autoclavable electrode with a gel-type reference. The
reference element incorporates a silver-ion trap to prevent
silver sulfide contamination of the reference junction. The
gel-type reference is also available in a combination ORP
and as a separate reference electrode
2 Preparation
After unpacking, examine the electrode for any mechanical
damage.
METTLER TOLEDO electrodes are factory tested and are
shipped ready-to-use. (To maintain factory pressurization,
the Type 405-DPAS-SC electrodes have a silicone seal
covering the ceramic diaphragm; this must be removed with
the enclosed blade prior to use.) Remove the hydration cap
and remove any electrolyte crystals by rinsing the electrode
with distilled water. Pat dry; do not rub as this may build up
a static charge and lengthen the response time.
Eliminate any air bubbles around the internal element in the
pH-sensitive membrane.
3 Operation
METTLER TOLEDO pH electrodes can be used with most pH /
mV meters.
Follow manufacturer's instructions for use.
A two-point calibration is recommended, using fresh buffers
of known pH values which bracket the sample pH; one buffer
should be close to pH 7 to set the zero point. For fast routine
analysis, a standardization using one buffer at a value near
the sample pH can be done.
4 Sterilization
Type 405-DPAS-SC electrodes are steam-sterilizable in-
situ and autoclavable. Follow operating instructions for the
autoclave. It is advisable (but not necessary) to put the
closure cap (p/n 00 201 1096) on the connector prior to
autoclaving.
Repeated sterilization may cause the electrolyte to discolor
slightly due to the elevated temperatures. This does not affect
the electrode performance.
5 Maintenance
When properly cared for, METTLER TOLEDO electrodes
should provide accurate results over thousands of uses.
Storage: Electrodes should be rinsed thoroughly after use
and stored in 3M KCl or pH 4 buffer solution with added KCl.
DO NOT store the electrode dry or in distilled or tap water;
this dehydrates the pH membrane and the electrode must
be rehydrated before use by immersing for several hours in
3M KCl.
Refilling: Type 405-DPAS-SC gel-reference electrodes are
not refillable.
© 04 / 16 Mettler-Toledo GmbH
53 500 085
405-DPAS-SC pH Electrodes
405-DPAS-SC pH Electrodes
Printed in Switzerland