ABB LWT300 series, Руководство пользователя

Страница: 69 / 108

Setting calibration parameters
65
Changing the full/span value
This value (probably set initially from the Easy Setup menu) represents the highest level measurement
value in your vessel (distance from the empty/zero position).
To set that value:
1 Select Calibrate > Level Calibration > ↑ Full/Span .
2 Press Edit .
3
Set the value as necessary and press
OK
.
Changing full/span value in hardware
To set this value in hardware, you first need to completely fill the vessel whose level you want to measure.
Once the vessel is full 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 (see Figure 47 on page 64).
2
Once the probe is fully deployed, press the
S
button for a few seconds. This sets the full/span
calibration value.
Adding a level offset
A level offset is a distance that you might add and that represents the distance between the bottom of
the tank and the empty/zero value.
The default value for this parameter is 0 m. The value can be set between –50 and 50 m.
To set that value:
1 Select Calibrate > Level Calibration > Level Offset .
2 Press Edit .
3
Set the value as necessary and press
OK
.
Adding a sensor offset
A sensor offset is a small distance that you might need to add to the sensor reference value (e.g., if the
probe in angled slightly at the junction with the sensor).
The default value for this parameter is
0
m. The value can be set between –30 to 30 m.
To set that value:
1 Select Calibrate > Level Calibration > Sensor Offset .
2
Press
Edit
.
3
Set the value as necessary and press
OK
.