11
54-610 Thermatel Model TD1/TD2 Flow Level Switch
2.6.3 Adjustment Procedure – HIGH FLOW Detection
1. Place Fail-safe in the “HL” position (
).
2. Increase the flow rate to desired alarm point. Allow 3
minutes for the sensor to stabilize.
3. Rotate alarm potentiometer counterclockwise until the red
LED turns on.
4. Rotate alarm potentiometer clockwise until the red LED
goes out.
5. Repeat steps 4 and 5 several times leaving the red LED in
the “on” position.
6. Reduce flow to normal condition, the alarm should reset.
7. Increase flow to the desired alarm point. If the response
time required to detect high flow is too long, rotate alarm
potentiometer counterclockwise
1
⁄
2
turn and test again.
2.6.3.1 Unable to Change Flow Rate
1. Maintain flow rate at normal operating conditions. Allow
3 minutes for the sensor to stabilize.
2. Follow the procedures below for Low Flow Alarm or High
Flow Alarm.
Low Flow Alarm
a. Set fail-safe to “LL” position (
).
b. Rotate alarm potentiometer counterclockwise until the red
LED turns on.
c. Rotate alarm potentiometer clockwise until the red LED
goes out.
d. Repeat steps b and c several times leaving the LED in the
off position. Continue to rotate the potentiometer
1
⁄
2
turn
clockwise. The set point is now just below the present flow
rate. When the flow rate drops below the present flow rate
the red LED will turn on and the relay will de-energize.
High Flow Alarm
a. Set fail-safe to “HL” position (
).
b. Rotate alarm potentiometer counterclockwise until the red
LED turns on.
c. Rotate alarm potentiometer clockwise until the red LED
goes out.
d. Repeat steps b and c several times leaving the LED in the
"off" position. Continue to rotate the potentiometer
1
⁄
2
turn clockwise. The set point is now just higher than the
present flow rate. When the flow rate increases above the
present flow rate the red LED will turn on and the relay
will de-energize.
High Flow Adjustment
(High Level Fail-safe)
Faster alarm or
decrease alarm point
Faster reset or
increase alarm point
Turn
Turn
