50-606 Kotron Tip Sensitive RF Level Sensor
6
1.9
Calibration
Caution: For Hazardous Locations
– Extra precautions must be
taken during instrument calibration. Before housing cover
is removed, power
MUST
be turned off.
1. Turn on power to the instrument.
2. Remove housing cover.
3. Set point locations:
Conductive media
— The set point is located at the tip of
the probe. Calibration is not required for most conductive
liquids. If the unit does not switch on alarm test, then
proceed to Step 4.
Non-conductive media
— The set point is located at the
probe at a point determined by the dielectric constant of
the medium. Refer to Figure 1 on page 2. Calibration is
required. Proceed to Step 4.
NOTE: An ohmmeter or other indicating device connected across the
relay terminals will indicate switch change with level change,
simplifying the calibration procedure.
4. Alarm adjustments:
High level alarm
(refer to Section 1.8.1,
Operating Mode
Selection
for proper jumper wire connection).
a. With no material on probe, turn zero adjustment con-
trol fully counterclockwise 20 turns. Refer to Figure 4
on page 4.
b. Slowly turn clockwise until relay contact changes.
c. The unit is now calibrated. The relay contact will
change state when the material rises on the probe.
NOTE: The calibration adjustment is more critical in low dielectric
media than in high dielectric media. Care must be taken to
turn the zero adjustment control just enough to deactivate the
alarm. If it is adjusted even 1⁄4 turn beyond the set point, the
zero adjustment band will be out of the operational change.
Low level alarm
(refer to Section 1.8.1,
Operating Mode
Selection
for proper jumper wire connection).
a. With material covering the probe, turn zero adjustment
control fully clockwise 20 turns. Refer to Figure 4 on
page 4.
b. Slowly turn counterclockwise until relay contact
changes.
c. The unit is now calibrated. The relay contact will
change state when the material falls below the probe.
