Calibrating The Analog Ez Modulevel; Direct Acting Field Calibration - Magnetrol ES Modulevel Installation And Operating Manual

Zero and Span Controls
Replace Covers
After Calibration
100% Level,
100% Level,
20 mA Output 4 mA Output
Desired
Level Range
(Direct Acting)
Zero Level,
4 mA Output
Bottom of Displacer
Figure 13
Analog EZ Modulevel
Field Calibration
48-618 ES/EZ Modulevel Displacer Level Transmitter (Top Hat Assembly Design)
2.4

2.4.1 Direct Acting Field Calibration

1. Bring process up to operating temperature.
2. Unscrew and remove protective covers from zero and span
3. Rotate the span control counterclockwise fully, approxi-
4. Rotate the zero control counterclockwise fully, approxi-
5. Establish liquid level at the desired 4 mA (0%) level on the
6. Adjust the zero control until the output signal is 4.00 mA
7. Replace cover on zero control.
8. Establish liquid level at the desired 20 mA (100%) level on
9. Adjust the span control until the output signal is 20.00 mA
Desired
Level Range
(Reverse Acting)
100% Level,
10. After setting the zero point, establish liquid level as close to
20 mA Output
11. Adjust the span control until the output signal corresponds
12. Replace cover on span control.

Calibrating the Analog EZ Modulevel

The Analog EZ Modulevel must be calibrated for each
unique application. It may be calibrated in service or on
a bench calibration stand. Bench calibration provides a
convenient way to set up the transmitter before going to
the tank site to complete the installation. Bench calibra-
tion, however, does not compensate for elevated process
temperatures.
For convenience during the calibration of a blind transmit-
ter, a DC milliameter may be connected to terminals (M+)
and (M-) in the junction box, see Figure 5 on page 6.
controls. See Figure 13.
mately 20 turns.
mately 20 turns.
displacer.
(0% on transmitter with analog meter).
the displacer.
(100% on transmitter with analog meter).
In the case that 20 mA (100%) level cannot be established:
the 20 mA level as possible.
with the % of actual level (e.g. 80 % level should equal (20
mA – 4 mA) x 80% + 4 mA = 16.8 mA).
10