Hach-Lange ORBISPHERE 31xxx Installation and Maintenance - Manual (Page 21)

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Section 4 Installation
4.1 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 Maintenance on
page 25 . If you are not familiar with sensor servicing, your Hach Lange representative will be
glad to assist you.
Note: Electrochemical H
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sensors do not require a complete cleaning procedure, as dechloridization and
rechloridization processes are normally not required.
4.2 Positioning information
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 m. are available,
still retaining the same signal sensitivity. (If the model 28117 pressure sensor is used, the
maximum cable length is 50 m.)
Check that the sensor will be mounted:
• perpendicular to the pipe.
• horizontal.
• on a horizontal pipe section (or on flow-ascending vertical pipe).
• min. 15 meters away from pump's discharge side.
• in a place where sample flow is stable and rapid; as far as possible from:
• valves
• pipe bends
• suction side of pumps
• CO
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injection system or similar
Note: There may be situations where not all the above conditions can be met. Please consult your Hach
Lange representative to appraise the situation and define the best applicable solution.