Toshiba LF494 - Manual (Page 90)

TOSHIBA
6 F 8 . A 0 7 7 4
8^2,16 Zero Offset Adjustment
Zero offset can be applied lo make the flowmeter ouipiits comparable lo process values
measured by other instruments. If the ¿его adjustment described in 6.2 requiring a zero
flow rate condition can he performed, diis zero offset adjustment is not needed. When the
zero adjustment is completed, zero offset will be automaiically cleared to zero.
Zero offset can be set in the range dciicribed below:
Zero oiiset: ±0,125 m/s (±1.25
7c
of 10 m/s—maximum range) maximum
IVocecd as follows to check or change the zero offset value.
■ I'o check the zero oHiset value:
Key operation Display example Description
SKI
□ U1: MANUAL ZERO
tOG2. 5
%
Press [SET] first to start the items selection sequence
and select Ml: MANUAL ZERO from among the
configuration items using [ ► ] and [ a ] keys. Then
press fSET] ufiain to display the current zero offset value
SET
□ Ml: MANUAL ZERO Pressing [SETj, the system returns to the items selection
sequence.
I To change the zero offset value:
Calculate the zero offset value with the following equation:
Zero offset value (%) = {{actual flow rate) - (LF404 measured value)}
The zero offset value should be c:dculated in percent value for Range 1. See the following
example.
(Example)
Measured condition Flow rate
%
in measurinf! span
Actual flow' rate obtained
from other insirumem,
10,0
m-V'min 50 %
LP4U4 measured value 10.5 m Vmin 52.5
%
Zero offset -2.5 %
If zero offset is set lo -2.5 %, the LF404 converter will output 50,0 %
llnvr' rate instead of.52,5%,
- а э -