Service manual

MDS E-SCAN MPR E-SCAN /INSTALLATION
11
It is essential that NO LEAKS be present in this line that could allow evaporation of liquids,
thereby plugging the purge line.
To avoid excessive prism deterioration keep the intervals between the purge times at maximum,
which may vary from minutes to 120 minutes, and the prism clean time at a minimum of
approximately 10 seconds. IMPORTANT: A major cause of refractometer trou
ble is the prism
wash.
1.4 Steam Purge Attachment
The steam purge valve must be similarly mounted to the adapter with a minimum of 6" and a
maximum of 18" from the steam port on an adapter preferably with 1/4" tubing.
Steam pressure must be at least 50 psi (3.44 bar)
above process pressure but less than 100 psi
(6.89 bar) above process pressure with adequate
condensation drainage at the steam valve in
order to ensure hot steam for cleaning the prism.
Trial and error must, of necessity, be employed
in determining the minimum steam time
necessary for proper steam cleaning of the prism
due to variables from application to application.
Steam Purge Connections – for liquids
which exhibit a tendency to “coat”