Manual Zero Adjustment - Toshiba LF620 Instruction Manual

8.2.15 Manual Zero Adjustment

This function is used to perform zero adjustment simply by comparing the output value of the converter
with the process value of other instruments without stopping the process of measurement.
If zero adjustment described in 8.2.14, "Still Water Zero Adjustment" can be performed, this
manual setting is not needed.
● Changing the manual zero adjustment value
Calculate the adjustment value with the following equation:
Adjustment value (%) = {(Actual flow rate) − (Converter's measured value)}
* Calculate the manual zero value using the % value for the setting range (Range 1) of the converter.
See the following example.
(Example)
Actual flow rate obtained
from other instrument
Converter's measured value
Manual zero adjustment value
(If manual zero adjustment value is set to +2.5 %, the converter output is shifted by −2.5%
and the output of 50.0 % will be obtained.)
The following is an example to change the manual zero adjustment value from +1.0% to −2.5%.
Switch operation
STEP1
STEP2
Flow rate
3
／min
10.0 m
3
／min
10.5 m
Display example
F:ZERO
Select "MANUAL" from the setting item
1 ZERO ADJ
selection menu.
2 MANUAL
3 EXIT
ESC
MANUAL
The currently set manual zero value (+1.0%
in this example) appears.
+001.0
Then push
%
ESC
MANUAL
The switches at the bottom change.
(
+001.0
At the same time, the cursor appears.
%
− 78 −
6 F 8 A 0 9 2 7
% value to setting span
50.0 %
52.5 %
-2.5 %
Description
.
are shown.)