K-Patents PR-03 - Manual (Page 13)

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2 Inline refractometer sensor 7
Important: Always mount the sensor so that the cable plug socket on the sensor head points downwards,
i.e. so that when the interconnecting cable is plugged into the sensor, the cable hangs down.
Figure 2.3 Refractometer cable plug direction
2.2.2 Check list for pipe mounting (PR-03-A, PR-03-D, PR-03-M)
1. If the process pipe diameter varies, select the position with the smallest diameter (and accordingly
highest velocity). Then the prism keeps better clean. If the pipe is coned up after a pump, valve or
magnetic flow meter, then add a length of straight pipe before the coning up and mount the refractometer
there.
2. If the refractometer is used in a feed-back control loop, make the time lag short. E.g. when a dilution
valve is controlled, mount the refractometer as near the dilution point as possible.
3. If the temperature varies along the process pipe, select the position with the highest temperature. Then
the risk of prism coating is minimized, because higher temperature means higher solubility and also
lower viscosity.
4. Often the position with the highest pressure (= after pump + before valve) has favorable flow conditions
without sedimentation or air trapping risks.
5. The sensor should be conveniently accessible for service.
Important: If the process pipe vibrates, support the pipe. A vibrating pipe might damage the inline sensor
mounted on it.