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Syrup Concentration Monitor Typical Sensor Mounting

Drawing of sensor mounting

The probe rotor must be completely immersed in syrup at a point where concentration changes will be quickly sensed. For inline installation, a minimum pipe or chamber size of 4" is required since the rotor disk is 3" diameter. Horizontal mounting is preferred but the probe can be mounted with the drive motor above the rotor at any angle up to vertical. With the motor below the probe, the maximum angle should not exceed 75 degrees from horizontal or there is danger of purge water from the outer shaft bearing leaking into the motor ball bearings. Typical installation arrangements are shown in the image above.

Syrup from an evaporator body tends to be stratified as it flows to the outlet pipe, so it is better to have the probe in the line just below the body so that the heavy and light streams will be mixed and averaged by the spinning rotor. Even though outflow is stopped entirely, the heavier syrup streams will settle to the rotor area and show the increasing concentration so that feed and withdrawal can be increased before the syrup rises excessively. Shut-off and bypass valves are recommended in the event that the probe must be withdrawn for examination or maintenance without interrupting evaporator operation. This is illustrated in the diagram above at left.

Typical in-line chamber installation is shown in the center diagram above. These installations are suitable for lines carrying small or moderate syrup flow.

Syrup tanks and melters are generally open vessels so a variety of probe mounting arrangements is possible, as shown in the diagram above at right.