Applications Guide
130
Modline 5
Figure 78: Analog Output Configuration
8.2.1
Analog Output Range Scaling Example
The Sensor temperature range example shown in
is 500 degrees to 2500 degrees. The minimum
analog output, at 0 or 4 milliamps as selected, can be set to equal the Sensor’s 500 degree zero scale
temperature or to an alternate value, such as the 1000 degrees illustrated in the figure. The maximum
analog output, 20 milliamps, can be set to equal the Sensor’s 2500 degree full scale temperature or to an
alternate value, such as the 1800 degrees illustrated in the figure.
When scaled to equal the Sensor’s complete range, the analog current output corresponds to a 500 to
2500 degree range and a temperature span of 2000 degrees. With the alternate temperature scaling, the
analog current output corresponds to a 1000 to 1800 degree range and a temperature span of 1000
degrees.
A minimum 10 degree F (6 degree C) span between zero scale and full scale is required.
Figure 79: Analog Output Scaling
8.2.2
Measured Temperature Calculations
An analog current signal output of 0 to 20 mA provides a full 20 mA current span. The 4 to 20 mA
output provides a 16 mA current span. To convert the output current to temperature, you must know
the current output span and corresponding temperature span to calculate the resultant temperature.
600 Ohm Maximum Current Loop Resistance)
SENSOR
LOAD(S)
Scaled analog
output zero scale
Scaled analog
output full scale
Sensor temperature span = 2000
