E31.0.12.6C-06
Mounting and operating manual GIA 20 EB with electrically insulated supply
page 25 of 32
8.1. Adjustment
The display has to show
0FFS.
Parameter
Button 1
Value
Button 2 / 3
Description
0FFS
±
50
Offset
The input of the offset will be in digit or °C/°F.
The value that had been set will be subtracted from the meas-
ured value
S(AL
±
2.00
%
Slope
Finish adjustment:
Press
Button 1
as often till the device executes a reset. The values will be stored at it.
Calculate correction:
Temperature:
Displayed value = (measured value
– zero point offset) * (1 + slope adjustment [% / 100])
Standard signal:
Displayed value = (measured value
– zero point offset - di.Lo) * (1 + slope adjustment [% / 100]) + di.Lo
Examples for offset- and slope-adjustment:
Example 1: Connecting a Pt1000-sensor (with an offset error depending on the cable-length of the sensor)
The device displays the following values (without offset- or slope-adjustment): 2°C at 0°C and 102°C at 100°C
Therefore you calculated: zero point: 2
slope:
102
– 2 = 100 (deviation = 0)
You have to set:
offset =
2
(= zero point-deviation)
scale =
0.00
Example 2: Connecting of a 4-20mA-pressure-transducer
The device displays the following values (without offset- or slope-adjustment): 0.08 at 0.00 bar and 20.02 at 20.00 bar
Therefore you calculated: zero point: 0.08
slope:
20.02
– 0.08 = 19.94
deviation:
0.06
(= target-slope
– actual-slope = 20.00 - 19.94)
You have to set:
offset =
0.08
(= zero point-deviation)
scale =
0.30
(= deviation / actual-slope = 0.06 / 19.94 = 0.0030 = 0.30% )
Example 3: Connecting of a flow-rate-transducer
The device displays the following values (without offset- or slope-adjustment): 0.00 at 0.00 l/min and 16.17 at 16.00 l/min
Therefore you calculated: zero point: 0.00
slope:
16.17
– 0.00 = 16.17
deviation:
- 0.17
(=target-slope
– actual slope = 16.00 - 16.17)
You have to set:
offset =
0.00
scale =
- 1.05
(= deviation / actual-slope = - 0.17 / 16.17 = - 0.0105 = - 1.05% )
