31 Maintenance
Maintenance of HDM97Pocket
Generally the HDM97Pocket can be considered as an easy-care instrument. Like all measuring instruments
there is a minimum of maintenance and care necessary to ensure that all functions work flawlessly.
Operate the instrument only in a dry environment, and do not touch it with damp hands. Ensure that no fluids
intrude into the interior of the device, or into the sockets at the front.
There are no parts in the HDM97Pocket which you can repair yourself. Contact our technical support team in
the event of any malfunction. If the device should become damaged, or malfunction, send it to IBP or your
distributor for repair.
Storage
Keep the device in a dry place. Suitable is, for example, the original packaging in which you have received
the HDM97Pocket , or the carrying case offered by IBP as accessory. If you do not use the device over a
longer period of time, you should connect it to the included charging device about every month for one hour
to avoid exhausting the batteries.
Cleaning
Never clean the device with any fluids! In case of pollution you can wipe the surface of the HDM97Pocket
with a dry and clean cloth. For measurements in the lower conductivity range, the cleaning of the
conductivity/temperature measuring cell is recommended. Remove water-soluble substances by rinsing with
deionized water, fats and oils with warm water and household dish washing detergent. Lime and hydroxid
crusts can be dissolved by a 10% citric acid solution. In each case, the measuring cell needs to be washed
with deionized water after the cleaning. Basically, the conductivity measuring cell does not decay over time.
Particular measuring media (for example, strong acids and caustic solutions, organic solvents), or too high
temperatures shorten the service life considerably, and/or lead to damage.
Caring for the conductivity/temperature electrode
Thorough cleaning of the electrode is particularly important for measuring low conductivities.
Water-soluble substances must be removed by rinsing with deionized water. Remove lime deposits with a
10% citric acid solution. To do this, immerse the electrode in the solution for 30 minutes at room
temperature, then rinse it thoroughly with deionized water. Do not touch the electrode surface with your
fingers. If necessary, clean the surface with acetone.
Caring for the flow sensor
After use make sure to rinse the flow sensor with deionized water for a couple of minutes. Please clean the
inlet filter on a regular basis.
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