ADwin-Pro II
Hardware, manual Dec. 2018
149
Pro II: Extension and Interface Modules
Pro II-RTD-8 Rev. E
ADwin
5.8.1 Pro II-RTD-8 Rev. E
The module Pro II-RTD-8 Rev. E has 8 inputs for connecting platinum resis-
tance temperature detectors of the type Pt 100, Pt500, Pt1000, or Ni100. The
inputs are connected via a multiplexer with an ADC. The maximum possible
measurement range is -200°C…+700°C, depending on the temperature sen-
sor (see data sheets of manufacturer).
There are 2 module variants:
– Pro II-RTD-8 Rev. E: Module inputs on a 37-pin D-Sub connector.
– Pro II-RTD-8-L Rev. E: Module inputs on Lemo connectors. Pin assign-
ment see fig. 132.
Measurements can be done with 2, 3 or 4 wire technique; input circuit see fig.
131. Measuring method and sensor type are set vie software.
Measuring methods and wiring between sensor and module are described
starting from page 151.
Measurements are performed automatically by a sequence control according
to the settings. During a measurement, multiplexers connect the measuring
wires with the sensor and disconnect them afterwards. Then, the measure-
ment values are available in the module, so the
ADwin
CPU only has to read
them.
Input signals run through a second order low-pass filter with 25kHz. Addition-
ally, you can use the instruction
P2_RTD_Channel_Config
to filter a single
frequency from the digital signals; the measurement value is calculated as
mean value of several measurements being done in defined sampling inter-
vals.
Fig. 131 – Pro II-RTD-8 Rev. E: Block diagram
Fig. 132 – Pro II-RTD-8 Rev. E: Pin assignment Lemo connector
Inputs
8
Measurement
2 wire, 3 wire or 4 wire
Multiplexer settling time
100µs
Input filter
25kHz (2nd order)
Max. measurement range
-200°C…+700°C
Fig. 133 – Pro II-RTD-8 Rev. E: Specification
+Ub
A
D
18-Bit
ADwin-Pro II
bus
addr.
data
data
register
data
address
decoder
sequence
control
control
100μA
200μA
1000μA
LPF
fc = 25 kHz
MUX
19
Exci
37
36
Excitation -
18
Sensor -
Pt 100,
Pt 500,
Pt 1000
Q
MUX
MUX
MUX
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
Pt 100
Pt 500
Pt 1000
1
2
3
4
Source (+)
Source (-)
Sense (+)
Sense (-)
