Carbolite 302P4 User Manual
Page 23
Programming
23
MC22-GB-V1.00
Press function
until CALH is displayed
Press the Up
or Down
to enter the lower calibration temperature to which the offset is to
be applied. Example. 1400°C
Press function
until OFS.H is displayed
Press the Up
or Down
to enter the offset to be applied to the lower calibration
temperature. Example: If at the calibrated temperature of 1400°C the controller is reading
1402.1, the offset will be -2.1°C (1402.1-1400 = 2.1)
Press function
to confirm selection.
Slope and offset calibration CL.St = C.CL3
To calculate an offset and slope.
Select two points within the measure range. In these points the error will be zeroed by the
offset and slope adjustment procedure. Mark the co-ordinates of the two points.
If CL.St is set to C.CL3
compute and set the “SLOP” and “OFSt” values using the below
formulas
“SLOP ” = (Y
2
– Y
1
) / (X
2
– X
1
)
“OFSt ” = Y
1
– X
1
* (Y
2
– Y
1
) / (X
2
– X
1
)
or the below spreadsheet with same examples:
Point 1
X1
20
20
0
20.1
Y1
20
24
0
18.5
Point 2
X2
90
90
70
80.4
Y2
90
94
77
85.3
Coefficient
"OFSt"
0.0
4.0
0.0
-3.8
"SLOP"
1.000
1.000
1.100
1.108
Comments
No
adjustment
Offset
adjustment
Slope
adjustment
Offset and
slope
adjustment
X value
(from the sensor)
Y value
(to the controller)
X
2
X
1
Y
1
Y
2
point 1
point 2