ABB LWT300 series, Руководство пользователя

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64
User Guide
—
Figure 46
The Calibrate menu
Changing the empty/zero value
This value (probably set initially from the
Easy Setup
menu) represents the lowest level measurement
value in your vessel. If you set this value first with the
Easy Setup
menu, you can change it later.
To set this value:
1
Select
Calibrate
>
Level Calibration
> ↓
Empty/Zero
.
2
Press
Edit
.
3
Set the value as necessary and press
OK
.
NOTICE
Make sure that the empty value is less than or equal to the full value.
Changing empty/zero value in hardware
To set this value in hardware, you first need to completely empty the vessel whose level you want to measure.
Once the vessel is empty and you have inserted the probe in the vessel:
1 On the instrument head, unscrew and remove the nameplate. This exposes two buttons (identified Z
and S ) and the write-protection screw.
—
Figure 47
Accessing the Empty/Zero and Full/Span buttons
Nameplate
Full/Span (S) button
Empty/Zero (Z) button
2 Once the probe is fully deployed in the vessel, press the Z button for a few seconds. This sets the
empty/zero calibration value.