Scaling Function; Figure 7 - Scaled Output Range Of Pt100 - Honeywell 2MLF-RD4A User Manual

2. Specifications
2.3. RTD input module characteristics

Scaling function

This function allows to scale the output range as specified by the user and is different
from the normal temperature range for that sensor.
Default range setting is as follows:
1. Signed 16-bit data type of -32768–32767
2. Unsigned 16-bit data type of 0–65535.
If you select any one of the above two to specify the input temperature range, the input
temperature will be stored in the internal memory as the scaled value.
Example: PT 100 is used as the sensor and the scaling range is set to -100 – 1100 as a
signed number.
The scaled temperature value for 200°C input temperature is as follows.
Scale calculation:
For Pt100: X1= -200.0, X2= 850.0
JPt100: X1= -200.0, X2= 640.0 in the applicable formula.
28 Resistance Temperature Detector 2MLF-RD4A User's Guide
Figure 7 – Scaled output range of Pt100
Y − Y
Y = 2 1 ( X − X
X − X
2 1
Honeywell
) + Y
1 1
R200
September 2010