Transmitter Calibration And Setup; Level Output Calibration; Calibration Using The Pushbuttons; Reversing Action - K-TEK AccuTrak AT100 Installation & Operation Manual

4.0 TRANSMITTER CALIBRATION AND SETUP

4.1 Level Output Calibration

The AT100 is a digital transmitter with no routine calibration required. If re-calibration is required, calibration
can be changed using the module pushbuttons, a HART communicator (for units with the HART option), or with the
menu driven LCD readout (for units with LCD option).

4.1.1 Calibration Using the Pushbuttons


Setting the 4mA point:
-Establish a tank level of 0% or move the float to the desired 0% point
-Enter the calibration mode by pressing the UP & DOWN buttons together for 1 second.
-Press the DOWN button for 1 second to set the output at 4.00mA.

Setting the 20mA point:
-Establish a tank level of 100% or move the float to the desired 100% point
-Enter the calibration mode by pressing the UP & DOWN buttons together for 1 second.
-Press the UP button for 1 second to set the output at 20.00mA.
Note: The above steps can be repeated as many times as required

4.2 Reversing Action

If required, transmitter output can be reversed by following these steps (Note: this only reverses the 4-20 mA
output, not the Engineering Unit Readout)

4.2.1 Reverse Action Calibration Using The Pushbuttons

1. Adjust the tank level to 50% or move the float to the 50% point ( + or - 10% ).
-Enter the calibration mode by pressing the UP & DOWN buttons together for 1 second and press
the DOWN button for 1 second to set the output at 4.00 mA.
2. Adjust the level or move the float to the new SPAN (20.00mA) point.
-Enter the calibration mode by pressing the UP & DOWN buttons together for 1 second and press
the UP button for 1 second to set the output at 20.00 mA.
3. Adjust the level or move the float to the new ZERO (4.00mA) point.
-Enter the calibration mode by pressing the UP & DOWN buttons together for 1 second and press
the DOWN button for 1 second to set the output at 4.00 mA.
Note: Procedures 4.1.1 and 4.2.1 will only change the calibration for the selected Primary Variable.

4.3 Damping

Damping helps to reduce the affects of rapid or irregular movement of the fluid level in a tank or vessel.
Adjustments to Damping will either increase or decrease the time required for the transmitter output to respond to
changes in input from the sensor tube. A higher number allows for more output stability. A lower number will
provide a quicker response. The maximum response time to a process change will be less than 110 milliseconds or
the value of the Damping, whichever is greater. The factory default setting for Damping is 0.8 seconds.

The output damping amount can be changed as follows:
-Press the SELECT and UP buttons together for 1 second to double the damping value.
-Press the SELECT and DOWN buttons together for 1 second to divide the damping value by 2.

The Damping value may also be adjusted in the Calibration Menu on transmitters equipped with an LCD Display.
The Damping is adjustable from 0 to 36 seconds.
AT100-0200-1 Rev L (10-2010) DCN0528 7