Weidmuller PT 100-4 User Manual
WAVESERIES
PT 100/4 Signal Conditioners
for Current Output
Type Cat. No.
Screw-type connection
WTS4 PT100/4 Select C 843227
Tension clamp connection
WTZ4 PT100/4 Select C 843228
Read these instructions before using the product
and retain for future information.
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1 General instructions
The WAVESERIES signal conditioner PT 100 should only be installed by qualified staff. The signal conditioner PT 100 should
only be powered up following professional installation.
2 Application
The WAVESERIES signal conditioner PT 100 can be used to
connect PT 100 sensors as well as converting temperature data
into standard linear current signals. The temperature range can be
set by DIP switches on the printed circuit board.
The signal conditioner PT 100/4 can be connected to 2-, 3- and
4-wire temperature sensors.
3 Mounting and dismounting
Warning!! Mounting and dismounting may only be carried out
3.1 Mounting onto TS 35 DIN rails
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when the power supply has be disconnected. Failure
to observe will lead to considerable damage!
(Figure 1)
3.2 Pluggable electronic components for range alteration
(depending on model)
(Figure 2)
1. Remove connector , (depending on model either screw -type
or tension clamp).
2. Press locking clips on both sides of the enclosure.
3. Pull out the circuit board.
Warning!! The circuit board can only be inserted in one position.
The connectors have been coded by the manufactur er , ensuring that they cannot be reversed.
3.3 Setting the potentiometer (depending on model)
(Figure 3)
The module has been exactly calibrated by the manufacturer .
Should nevertheless a follow-up adjustment be necessary, open
the hinged cover upwards.
The potentiometers are on the front panel.
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3.4 Pluggable cross-connections for voltage supply
(Figure 4)
A maximum feed through of 2 A is possible.
If a signal conditioner is accidently rotated through 180°, the
cross-connection cannot be inserted.
3.5 Labelling possibilities
Figure 5
WS 10 connector markers can be used to label module.
4 Calibration
Warning!! The power supply must be disconnected, before
4.1 Equipment
– Power supply 24 Vdc, 50 mA
– Simulator for PT 100 or precision resistance decade
– Current meter/voltmeter that can be so calibrated, as to allow
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changing the signal conditioner settings using the DIP
switches.
Failure to observe will lead to considerable damage!
an accuracy of > 0.1 % fr om the upper range value
4.2 Basic calibration with a signal output from 0 ... 20 mA
1. Select the temperature range on the printed circuit board
using the DIP switch, see table on the module or pages 41
and 42.
The DIP switches 1, 2 and 3 set the minimum input temperature ϑ
.
min
The span (difference between minimum and maximum input
temperature) is set using the DIP switches 4, 5 and 6.
2. Professionally install module.
3. Add 1 % of the temperatur e span to the selected “ minimum”
temperature and set this value on a PT 100 simulator (when
using a pr ecision resistance decade, where necessary observe DIN IEC 751 conversion table fr om °C to Ω!) and calibrate the signal conditioner output signal to 0.200 mA using
the null potentiometer. (The potentiometers are located behind the hinged cover).
4. Set the “maximum” selected temperature on a PT 100 simulator (or precision resistance decade) and calibrate the signal
output to 20.000 mA using the S pan potentiometer.
5. Repeat steps 3 and 4 (approx. 2-3 times), until the required
accuracy is achieved.
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Example
Input range: -50 ... +150 °C
Minimum input temperature: = -50 °C
Choose next lower or equal value according to table for ϑ
min
.
Table value -60 °C
Set DIP switch 1 to OFF; DIP switches 2 and 3 to
ON.
The span is 200 K (150 °C - (-50 °C)).
The table value lies between 165 ... 245 °C
Set DIP switch 4 to OFF; DIP switches 5 and 6 to
ON.
The input range must be raised by 10 K (-60 °C + 50 °C).
The 10 K corresponds to 5 % of the span (see calculation).
The input range can be raised by up to 25 % using the "null"
potentiometer.
Calculation:
Should the 25 % be exceeded using the above calculation, then
an adjustment to the temperature input range is not possible.
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