Toshiba lf546 User Manual

 
 

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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) 

 

Flow rate 

% value to setting span 

Actual flow rate obtained 
from other instrument 

10.0 m

3

／min

50.0 % 

Converter’s measured value 

10.5 m

3

／min

52.5 % 

Manual zero adjustment value

 

-2.5 % 

(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 

Display example 

Description 

 

F:ZERO 

1 ZERO ADJ 

2 MANUAL

 

3 EXIT 

 

 

Select "MANUAL" from the setting item 
selection menu. 

STEP1 
 
 

 

MANUAL 

 

    +001.0 

 

         % 

 

 

 

The currently set manual zero value (+1.0% 
in this example) appears. 

 

Then push              . 

 

STEP2 
 
 

 

MANUAL 

 

    

+

001.0 

 

         % 

 

 

 

The switches at the bottom change. 
(                                      are shown.) 
At the same time, the cursor appears. 

 
 

 

ESC 

ESC