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MT2000-0200-1 Rev f (10-2007)
DCN0160 17
4.5.5 Bench Calibration of the 4mA & 20mA Points:
After the transmitter is configured correctly, a manual bench calibration of the 4mA and 20mA points using hands or
targets, can be done as follows.
Note: The following applies to single or dual Rod and Cable probes only. Other assemblies such as coaxial probes
must be calibrated with products.
If the probe is a rod, position it so that it stands clear of any objects (minimum of 6 in. / 152 mm). For support use
only very low dielectric materials (such as Styrofoam blocks). If the probe is a cable hang the cable vertically in
open space or place it under tension between the coupler and cable end. An open palm of the hand or a metal plate
can be used as a target if placed perpendicular to the probe. Use the front of the hand as the measuring surface,
and place rod between two middle fingers. A suitable metal target can be a 6 in. / 152 mm diameter plate with a slot
or hole in the center, to slide over the sensing rod. This method will simulate high dielectric product such as water.
• Setting the 4mA point:
• Enter the calibration mode by pressing the UP & DOWN buttons together for 3 seconds.
• Place hand or target at 0% level and press the DOWN button for 1 second to set the output at
4.00mA.
• Setting the 20mA point:
• Enter the calibration mode by pressing the UP & DOWN buttons together for 3 seconds.
• Place hand or target at 100% level and 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. The easiest way to set the 4 mA and 20 mA
points is through the CAL menu as described in Section 4.3.
4.5.6 4mA & 20mA Calibration Using Actual Level Input:
A manual calibration of the 4mA and 20mA points using the actual vessel level can be done as follows:
• Setting the 4mA point:
• Enter the calibration mode by pressing the UP & DOWN buttons together for 3 seconds.
• Establish a tank level of 0% and press the DOWN button for 1 second to set the output at 4.00mA.
• Setting the 20mA point:
• Enter the calibration mode by pressing the UP & DOWN buttons together for 3 seconds.
• Establish a tank level of 100% and press the UP button for 1 second to set the output at 20.00mA.
Notes: The above steps can be repeated as many times as required.
• Should CALIBRATE be entered inadvertently, pressing SELECT will exit this function, making no changes to
LRV or URV.