50-613 Kotron
®
Series 82 CE RF Level Transmitter
15
c. Excessive loop resistance. Refer to chart on page 18 for
maximum resistance.
d. Power supply not turned on.
e. Insufficient source voltage. 14 volts minimum is
required at transmitter terminals.
f. Test points jumpered together with current meter.
Remove meter.
g. LED is actually on but very dim. Turn span and zero
potentiometers fully clockwise; if LED is now on,
proceed with calibration.
h. Potted module defect. Consult factory for help.
2.3.2 Calibration
1. Test meter connected to calibration points, but LED still on.
a. Wrong test meter mode. Use low resistance current
meter.
b. Test meter resistance is too high. Obtain meter with
less than 10 ohms resistance.
c. Test meter not properly connected to calibration points.
d. Defective test meter or leads; meter fuse blown.
2. Cannot read loop current at calibration points and LED
is off.
a. Meter set at too high of a range. Maximum loop
current is 38 mA (0.038 amps).
b. Calibration points jumpered together. Remove jumper.
c. No power, or sufficient power at transmitter terminals.
— Refer to Steps “a” through “h” under
Installation
section beginning on page 14.
3. Zero point cannot be set to 4.00 mA at low level.
a. Wires reversed at supply or transmitter.
b. Span controls incorrectly set
— Turn span potentiometers fully clockwise before
calibrating zero.
c. Excessive probe capacitance
— Decrease length of probe covered at zero level;
— Remove stilling well;
— Increase diameter or stilling well;
— Locate probe farther from walls;
— Use probe with lower dielectric insulation;
— Replace bare probe with insulated probe;
— Consult factory.
