K-TEK MT5000 - 5.0 Troubleshooting; 5.1 Valid Current Loop Outputs; 5.2 Symptoms and Solutions

MT5000-0200-1 Rev f (10-2010) DCN0528 32
Use a milliamp (mA) meter to measure the output current. When power is applied the output will go to 4.00 mA for
at least one (1) second and then to either the measured level or an alarm condition output. If this does not happen
the transmitter may not be receiving enough power or the main electronic is defective. Excessive current above
21.00 mA is an indication of defective electronics or improper wiring, disconnect the power supply immediately to
avoid further damage to the MT5000.
5.1 Valid Current Loop Outputs
21.00 mA
If the top board jumper is set to HI ALARM a loss of signal, a problem with the configuration
or a malfunction will cause the output to be set to the alarm condition of 21.00mA
20.58 mA
When the level increases above the 20.0 mA point the output will continue up to 20.6 mA and
then latch until the level returns below the 20.6 mA level.
4.0 mA to 20.0 mA Normal output range
3.85 mA
When the level decreases below the 4.0 mA point the output will continue down to 3.8 mA
and then latch until the level returns above the 3.8 mA level.
3.61 mA
If the top board jumper is set to LOW ALARM a loss of signal, problem with the configuration,
or a malfunction will cause the output to be set to the alarm condition of 3.61mA
5.0 Troubleshooting
5.2 Symptoms and Solutions
Symptom Possible Cause Solution
Output spiking high
 Blanking area too short  Verify proper Nozzle Length in BASIC
SETUP menu. (SECTION 4.3.5)
 From the WAVEFORM AT COUPLER dis-
play extend the Blanking (BLK) past ob-
structions. (Section 4.6.1)
 Threshold voltage too high  From the WAVEFORM display readjust the
LTV for the return signal. (Section 4.6.1)
Output too low
 Inadequate supply voltage  Check Power Supply Voltage
 Current drain in wiring  Check Wiring for Ground Faults or Water in
Conduit
No display and no mA Output
 Inadequate supply voltage  Check Power Supply Voltage
 Check Wiring Connections to Transmitter
and Power Supply
 Electronics failure  Replace Electronics Module (Section 5.3)
No display with mA Output
 Electronics failure  Replace Electronics Module (Section 5.3)
 Improper DAC Trim  Perform DAC Trim (Section 4.5.7)
Actual mA Output does not match
displayed Value
 Shorted RFI Filters in terminal
strip
 Replace Terminal Strip
Unit worked until new IS barrier was
installed
 Barrier does not meet
requirements for the transmitter
 Verify Barrier Specifications to Match
ELE1014
Upon power up current output drops to
4mA before reading correct level
 Normal Operation  Normal Operation