Identifying The Electrode Type - ABB 7651 Instruction Manual

...2 PREPARATION
2.2 Identifying the Electrode Type –
Fig. 2.2 and Table 2.1
A pH system is only as accurate as the electrodes used to make
the measurement. To satisfy a wide range of applications, and to
meet the demands of modern processes, the Company has
produced a range of electrodes to satisfy most requirements.
Reference Electrode (1730-000) fitted to all systems – used in
a sealed electrolyte or reservoir fed system, e.g. for applications
where the conductivity of the water is less than 30 µScm
General Purpose Electrode (1720-000) – suitable for most
industrial applications. Operates from 0 to 14 pH, 0 to 100°C (32
to 212 °F) and must be used when the mechanical wiper is fitted.
Low Resistance Electrode (1722-000) – low resistance
membrane electrode for low temperature. For use in the water
industry where the sample temperature drops below 10°C (50°F).
Operates from 0 to 10 pH, 0 to 70°C (32 to 158°F).
Note. For conductivities less than 30 µS cm
stainless steel system is recommended.
Cone Shaped Electrode (1721-000) – heavy duty electrode
designed specifically for ultrasonic cleaning. Operates from 0 to
14 pH, 0 to 100°C (32 to 212°F).
Low Temperature Cone Electrode (1723-000) – designed for
use with ultrasonic cleaner and especially where the sample is at
low conductivity/low temperature. Operates from 0 to 10 pH, 0 to
70°C (32 to 158°F).
Platinum Electrode for Redox (ORP), (1740-000) – platinum
electrode enables Redox (ORP) measurements to be made using
any of the electrode systems.
Antimony pH Electrode (1741-000) – designed to work in
applications when hydrofluoric acid is present.
Temperature Compensator (1750-000) – three-wire PT100
temperature compensator required to ensure high accuracy. It is
compatible with older generations of Company instruments as
well as the current models.
Note. All of these electrodes are compatible with the
AX, 4500 and 4600 Series, 9140, 9170 and 9180
Series transmitters.
4
*
1730-000 Reference Electrode
-1.
1720-000 General Purpose Electrode
1722-000 Low Resistance Electrode
-1 a 1721-000 & 1723-000 Cone-shaped Electrodes
1740-000 Platinum Metal Electrode
1741-000 Antimony Metal Electrode
1750-000 Temperature Compensator
* Fitted to all systems.
Fitted to all systems except when
model 1740 ( Redox - ORP ) is used or if
manual temperature compensation is used.
Fig. 2.2 Electrode Models