Intek 100FS - Manual (Page 10)

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3.3 ADJUSTING THE TRIP POINT
Adjust the flow switch trip level as follows:
1. 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.)
2. On the small switch board, if LED is green, adjust "Trip" potentiometer clockwise* until the
relay de-energizes (LED turns red). This is the alarm condition.
3. If LED is red, adjust "Trip" potentiometer slowly counterclockwise* just until the relay
energizes (LED turns green).
* Reverse direction of turns if the switch is used as a high flow alarm.
4. If the relay cannot be made to drop out over the full range of the "Trip" potentiometer, see
SECTION 3.4.
3.4 CHANGING THE TRIP POINT RANGE
Generally, the instructions in SECTION 3.3 should be followed for setting the trip point of the flow
switch. In some cases, the "Trip" potentiometer may not have enough adjustment on a particular fluid;
or you may wish to set the trip level beyond the range for which the flow switch was originally set up.
If this is the case, the settable range can be changed by the following procedure:
1. Attach a current meter to the + and ! output terminals (see Figure 1. Rheotherm 100 Signal
Conditioner PCB Layout).
2. Establish a flow rate close to the desired trip level.
3. Adjust "FLOW ZERO" potentiometer (P2) until the current meter reads 12 mA.
4. Follow instructions in SECTION 3.3 for setting the trip level.
3.5 TRANSDUCER FUNCTIONAL TESTS
A test of the Rheotherm instrument transducer can be performed as outlined below:
1. Transducer continuity check, Figure A.
2. Transducer isolation check, Figure B.
1. The transducer continuity check is performed as follows (see Figure A):
A. Disconnect the transducer cable from the electronics.
B. Make resistance measurements between the cable pairs as shown in Figure A. The
readings should be as indicated; if not, consult factory for repair.