En Instruction Manual - Mettler Toledo HA405-DPA-SC Betriebsanleitung

en
8
Instructions for Type HA405-DPA-SC
pre-pressurized gel-reference pH Electrodes
1 Introduction
The METTLER TOLEDO Type HA405-DPA-SC combination pH
electrode is a low-maintenance, pre-pressurized electrode
with a gel-type reference. It has a specially formulated HA
(high alkalinity) pH membrane to minimize sodium error in
extremely alkaline media. 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.
For order information or technical assistance, contact our
Customer Service department at +1-800-352-8763.
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 HA405-DPA-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 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 HA405-DPA-SC gel-reference electrodes are
not refillable.
Protein Contamination: Clean the electrode with pH Electro-
de Cleaner for Proteins following instructions on the bottle.
Reactivating pH membrane: Use Reactivating Solution follo-
wing directions CAREFULLY.
Servicing a clogged or dry reference junction: Immerse the
electrode in a beaker of 3M KCl. Heat the solution to appro-
ximately 70 °C (160 °F) and allow electrode to soak in this
solution as it cools to room temperature.
© 04 / 16 Mettler-Toledo GmbH
53 500 086
HA405-DPA-SC pH Electrodes
HA405-DPA-SC pH Electrodes
Printed in Switzerland