HF scientific MicroTOL Online Turbidimeter old series- 0-1000 NTU - Manual (Page 34)

MICRO TOL (12/04)
Rev. 2.7 28
9.0 Routine Maintenance
9.1 Cleaning the Flow Through Cuvette
Measurement cuvettes used for both grab sample and the flow though should be clean
and free of marks or scratches. Cleaning is accomplished by cleaning the interior and
exterior with a detergent solution and then rinsing several times with distilled or de-
ionized water. The cuvette can be replaced by first shutting off the flow using the
provided shutoff clamp; unscrewing the old cuvette and replacing with a fresh clean one.
9.2 Replacing or Installing the Desiccant Pouch
The Micro TOL continuously checks the condition of the
desiccant tray. When the desiccant gets in such a condition
that it may cause problems, the instrument will display DESC
on the lower portion of the display.
Proper use of the supplied desiccant is essential in
maintaining the performance of the instrument. The desiccant
has been designed to have a long life; however, replacement
of the desiccant pouch will be required from time to time. It is
also essential that all enclosure seals be maintained. The
emergency drain and o-rings that are supplied with each new
instrument, form part of the instrument humidity seal. Inspect
these items each time the desiccant pouch is replaced.
Replace any parts found to be defective.
The desiccant should be replaced when the instrument
displays DESC. A new sealed desiccant pouch and indicator
card are available from HF scientific inc. part #21555R.To
initially install or remove the old desiccant, simply unscrew
the four corner thumbscrews and remove the electronics half
of the instrument. Open the bag protecting the new desiccant
pouch and replace (or install for a new instrument) in the
desiccant tray assembly.
Note: Once the bag is opened, install the desiccant pouch immediately.