Product components, Accessories, Product overview – Hach-Lange POLYMETRON 9526 User Manual
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Product components
Make sure that all components have been received. If any items are missing or damaged, contact the
manufacturer or a sales representative immediately.
Accessories
The following accessories are provided with the product and are located in the drawer:
• Laminated quick reference guide
• User manual
• Certification of the product factory calibration
• Socket for mains power connection
• Tool for removing plugs and sample tubes
• 2 x DN8 to DN6 reduction sleeves to connect DN6 tubes to the product
• 2 plugs for the IN and OUT sockets to prevent measurement cell contamination
Product overview
The conductivity certification system is a portable test bed for rapidly and accurately calibrating and
verifying in-line conductivity measurement loops through direct use of the process sample and
comparison with our reference system.
It is particularly appropriate for pure and ultra pure water applications with weak conducting solutions
for which there is no reliable calibration solution. Indeed, any solution whose conductivity is inferior to
100 μs/cm is not stable in contact with air, as the dissolution of the CO
2
from ambient air leads to an
increase in the order of 1 to 2 μS/cm. It is therefore impossible to calibrate a conductivity loop
dedicated to pure water measurements of <10 μS/cm using a calibration solution of known similar
conductivity (KCl solution).
Any deviation observed between the value displayed by the system and that displayed by the
conductivity loop under validation/calibration can be due to several factors including:
• Fouling of the conductivity sensor under test due to the accumulation of insulating layers on the
electrode surface leading to a change of the cell constant
• Sampling issues such as poor sensor installation, insufficient immersion, air bubbles, etc.
• Incorrect controller resistivity/conductivity and/or temperature input calibration
• Long cables leading to capacitive effects not taken into account during controller electronic
calibration
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