Turn the DAMP ADJ pot to max CW (neg.) direction.
1.
Fill the tank to its L (0% ) level (with probe
covered).
2.
Depress UP or DW buttons on Z until meter
reads 4.00mA. Do not change the zero controls
from now on. If changed, the material will have to
be returned to the L (0% ) level.
Note : If a 4.00mA value cannot be reached, then
perform OFFSET AND RESET functions
3.
Fill the tank to the highest point possible (under
100%), and record this level as H1. The most
accurate calibration will be obtained with the
greatest separation between L and H1.
Note : The loop current may not rise in proportion to
therising material level in tank. Instead it may rise more
rapidly or more slowly than the material level. The SPAN,
S- UP or S-DW buttons may be used occasionally to
maintain the loop current approximatelly proportional to
the tank filling or just below the 20.00mA reading.
4.
To determine the loop current at H1 level use the
following formula:
( H1- L )
mA = ------------- x 16 + 4
( H - L )
Example: L = 12” (30.5 cm) from the bottom of the tank
H1 = 72” (183 cm) from the bottom of the tank
H = 96” (244 cm) from the bottom of the tank
( 72 - 12 )
mA = -------------- x 16 + 4 = 15.43
( 96 - 12 )
The correct loop current is 15.43mA.
Depress SPAN S-UP or S-DW buttons as required to
obtain a meter reading of 15.43mA. If 15.43mA reading
has been obtained, the calibration is complete.
Note : If a 15.43mA value cannot be reached, then
perform OFFSET AND RESET functions and re-start the
calibration
aran_v02 or higher
NRF-100_KM Rev. : 1.0
16 / 04 / 2002
01 / 12 / 2002
Turn the DAMP ADJ pot to max CW (neg.) direction.
1.
Fill the tank to its L1, some point above 0% level
and record this level as L1. See Fig. 4. To determine
the loop current at L1 level use the following formula:
(L1- L)
mA = ------------- x 16 + 4
(H - L)
Example: L = 12” (30.5 cm) from the bottom of the tank
L1 = 24” (61 cm) from the bottom of the tank
H = 96” (244 cm) from the bottom of the tank
(24 - 12)
mA = -------------- x 16 + 4 = 6.28
(96 - 12)
The correct loop current is 6.28mA.
2.
Depress Z-UP or Z-DW buttons on ZERO until meter
reads 6.28mA . Do not change the ZERO controls
from now on. If changed, the material will have to
bereturned to the L (0% ) level.
Note: If a 6.28mA value cannot be reached, then perform
OFFSET AND RESET functions
3.
Fill the tank to the highest point possible (under
100 % ), and record this level as H1. The most
accurate calibration will be obtained with the greatest
separation between L and H1.
Note: The loop current may not rise in proportion to the
rising material level in tank. Instead it may rise more
rapidly or more slowly than the material level. The SPAN,
S-UP or S-DW buttons may be used occasionally to
maintain the loop current approximatelly proportional to
the tank filling or just below the 20.00mA reading
4.
To determine the loop current at H1 level use the
following formula :
( H1- L )
mA = ------------- x 16 + 4
( H - L )
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