Hach ORBISPHERE 31 Série Manuel D'utilisation Simplifié page 9

4.1 An oxygen, ozone, or hydrogen electrochemical sensor
The sensor head is protected by a screw-on plastic storage cap. A plastic screw-on base protects the
connection socket, and provides at the same time a suitable stand.
Figure 2 Sensor components
1 Storage and calibration cap
2 Protection cap
4.2 A sensor maintenance kit
The maintenance kit includes the material needed to service and maintain the sensor.
Section 5 Installation
5.1 Initial sensor cell cleaning
Your ORBISPHERE electrochemical sensor has been thoroughly cleaned and tested at the factory.
To protect the electrodes from oxidation, the cell has been filled with electrolyte and a membrane has
been installed.
However, shipping and storage conditions can adversely affect electrochemical sensor cells,
therefore a sensor service (cell cleaning & membrane replacement) must be performed before using
the sensor.
To perform a sensor service, see the instructions in the section entitled
you are not familiar with sensor servicing, your Hach Lange representative will be glad to assist you.
Note: Electrochemical H
rechloridization processes are normally not required.
5.2 Sensor positioning
Unless the sensor is part of the ORBISPHERE equipment that includes it, the sensor must be
installed in an ORBISPHERE socket or flow chamber, that allows the contact with the sample fluid to
be analyzed.
The sensor and measuring instrument are connected by a cable and two 10 pin connectors. The
standard sensor cable length is 3 meters, but extension cables of up to 1,000 meters are available,
still retaining the same signal sensitivity. If the model 28117GP pressure sensor is used, the
maximum cable length is 50 meters.
Ensure that the sensor will be mounted:
• perpendicular to the pipe
• on a horizontal pipe section (or on flow-ascending vertical pipe)
• minimum of 15 meters away from the pump's discharge side
• in a place where the sample flow is stable and rapid, and as far as possible from:
• valves
• pipe bends
• the suction side of any pumps
3 Sensor base
4 Connection to instrument
sensors do not require a complete cleaning procedure, as dechloridization and
2
5 Collar
Maintenance on page 11. If
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