11
54-610 Thermatel
®
Model TD1/TD2 Flow Level Switch
2.6 Calibration
Calibration must be performed using the actual fluid.
The switch detects the cooling capabilities of the media.
Calibrating the switch in a different media may change
the set point. If the device was factory calibrated by
MAGNETROL, then there is no need to perform an
additional calibration.
NOTE: Set the switches (Section 2.5.1) to the desired position before
performing the calibration. Changing the Heater, Range,
Fail-safe, or Temperature Compensation settings will affect
the set point.
Select the fail-safe mode (HL or LL) before performing the
calibration. The fail-safe selection does affect the calibra-
tion set point.
Turning the alarm potentiometer clockwise to go from an
alarm condition to the normal (safe) condition. Turn the
alarm potentiometer counterclockwise to go into alarm.
NOTE: The LED operation changes with the fail-safe mode selection.
The red LED is illuminated when an alarm condition exists.
High Level Fail-safe
HLFS – The switch goes into alarm under a wet (high
level) condition or if the flow rate has increased above the
set point. On the TD2, the green and yellow LEDs will be
on at low flows or low level indicating a normal condition.
The number of green LEDs illuminated will decrease as
the flow rate increases.
Low Level Fail-safe
LLFS – The switch goes into alarm under a dry (low level)
condition or if the flow rate has dropped below the set
point. On the TD2, the green and yellow LEDs will be on
at high flow rates or high level indicating a normal condi-
tion. The number of green LEDs illuminated will decrease
as the flow rate decreases.
2.6.1 Adjustment Procedure for LEVEL Applications
1. Place HTR Switch in "-" position (
).
2. Set desired fail-safe condition.
3. Ensure time delay potentiometer (TD2 only) is fully coun-
terclockwise (rotate 30 turns or until clicks are heard).
4. Immerse in still liquid. Wait a minimum of 3 minutes for
the sensor to stabilize. (On the TD2, the mA output can
be monitored to determine when stable).
Follow procedure below for either High Level, Low Level,
or interface applications.
Alarm
to go into alarm
to come out of alarm
Turn
Turn
Switch Position
HLFS
LLFS
