Introduction
Page 6
Figure 1.1 Measuring principle
The Pt100 resistance is measured in
measuring cycle 3 and in measuring cycle 4
the resistance of the ground wire is
measured.
The resistance value from the Pt100
resistance is converted into a temperature
value via the standard table.
This temperature value is used as reference
temperature for the thermocouples.
The first time the 862 MIT is switched on
(with an MTT connected) measurement
cycles 7 ÷ 21 determines the wiring
sequence of the thermocouple wiring.
That wiring sequence is then programmed
in item MW (refer to chapter 2.3), and from
that moment on, measurement cycles 7 ÷ 21
checks if all elements are still connected in
the same order.
In measurement cycle 40 another conversion
factor is obtained (Hz/V) which is used for all
the voltage measurement values in the same
way as with the resistance measurements.
To Next Page
Loading...