Intek 100CS with CE Marking User Manual

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Failure to follow these installation recommendations may compromise the electromagnetic immunity
characteristics of the flow switch, especially when installed in close proximity to high powered radio
transmitters or frequently switched heavy electrical loads, and may cause false indications from the flow
switch. The application of greater than 75 volts (AC or DC) to the relay contacts may create a personnel
safety risk.

The housing for a 100CS flow switch is a round explosion-proof enclosure. When ready for use, the housing
lid should be tightly screwed on. A gasket is included when rain tightness is required. Here again, the lid
should be on tight to make a good seal against the gasket.


Typically, Rheotherm flow switches come from the factory set up for a 10 to 1 flow rate range, and with the
trip level set approximately as requested by the customer. The trip level can be adjusted using the instructions
in SECTION 2.4.

When power is first turned on, the flow switch may indicate a high flow rate, even if there is no flow
occurring. Correct indication of flow level will result after an initial period, which can extend to about forty
(40) seconds and depends on where the trip adjust is set.


Adjust the flow switch trip point as follows (see Figure 2, for trip potentiometer location):

All adjustments must be made by qualified personnel wearing an approved static discharge strap.


Establish a flow rate at the desired trip level. (This should be done with flow in the line, not at zero
flow. Select a flow rate below your normal usage. One example would be to use 50% of your
lowest normal flow rate as the set point.)


If the LED is green, adjust "Trip" potentiometer slowly clockwise just until the relay de-energizes
(LED turns red). This is the alarm condition.


If the LED is red, adjust "Trip" potentiometer slowly counterclockwise just until the relay
energizes (LED turns green).


If the relay cannot be made to drop out over the full range of the "Trip" potentiometer, see TABLE

2.5 USE AS A LEVEL SWITCH (Insertion Probes Only)

The probe switch design can be used to provide one point level switch indication. When the probe tips are
submerged in liquid, the relay is energized and the LED is green. When the liquid level drops below the
probes and they are surrounded by air or vapor, the relay de-energizes and the LED turns red. If the sensor
is installed in a horizontal orientation (parallel to the ground), the two probe tips should be in the same
horizontal plane so that liquid coming from below touches them at the same time.