Verify Proper Power Up Of The Transmitter; Verify Current Output Stability - K-TEK AccuTrak AT100 Installation & Operation Manual

6.0 SAFETY, MAINTENANCE, AND TROUBLESHOOTING
During normal operation, it is not necessary to perform maintenance on the AT100 transmitter. Routine
calibration of the transmitter is not necessary. The AT100 contains an EPROM which will store calibration in case of
an outage or electronics replacement.
6.7 Verify Proper Power-up of the Transmitter
Use a mA meter to measure the output current. When power is applied, the output should go to 4.00 mA for
at least 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 mA
is also an indication of improper power-up or defective electronics.

Valid Current Loop Outputs:
- 20.99 mA - High Alarm (The LCD Display will indicate level as ****)
If the top board jumper is set to HIGH ALARM, a loss of signal or a problem with the configuration or
a malfunction, will cause the output to be set to the alarm condition of 20.99 mA.
- 20.58 mA - Latched High
When the level increases above the 20 mA point, the output will continue up to 20.58 mA and then
latch at this value, until the level comes back down again.
- 4.00 - 20.00mA. - Normal output range
- 3.85 mA - Latched Low
When the level decreases below the 4 mA point, the output will continue down to 3.85 mA and then
latch at this value, until the level comes back up again.
- 3.61 mA - Low Alarm (The LCD Display will indicate level as ****)
If the top board jumper is set to LOW ALARM, a loss of signal or a problem with the configuration or
a malfunction, will cause the output to be set to the alarm condition of 3.61 mA

6.8 Verify Current Output Stability

If the output occasionally jumps up or down but not to an alarm condition, use a hand held P/S or hand held
loop calibrator to isolate the transmitter from the field wiring. If the problem disappears, this can be an indication of
noise or grounding problem. Field wiring should be run with an individually shielded cable with the shield connected
to ground at the power source and floating at the transmitter housing. Insure that the transmitter housing is
effectively connected to earth ground.
If the problem persists, there may be a location on the tube that has retained some magnetization, and
needs to be cleared. This can occur when a magnetized object such as a tool has been brought close to the sensor.
To clear any residual magnetization, slide a magnet or float against and parallel to the tube, from one end to the
other.
AT100-0200-1 Rev L (10-2010) DCN0528 25