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PRESYS
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Instruments
The connection of a certain type of sensor in input 1 does not restrict the use
of other sensor in input 2.
In order to avoid noise in the wiring, use twisted pair cable and cross sensor
connection wire inside a metallic tube or use shielded cable. Make sure to connect
only one shield wire end either to board terminal or to sensor ground, as shown in the
next items.
WARNING: GROUNDING TWO SHIELD WIRE ENDS MAY CAUSE NOISE IN THE
INDICATOR.
2.3.1 - Thermocouple Input
When using only one thermocouple, connect it to input 1, in order to get a
better precision in the temperature measurement, since the cold junction sensor is
placed near input 1.
In order to reduce the error due to cold junction compensation, use thermal
paste in the rear, at the terminals where the thermocouple is connected to the cold
junction sensor.
Connect the thermocouple to terminals 2 (+) and 3 (-) to use input 1 or to
terminals 5 (+) and 6 (-) to use input 2 as shown in figure 6.
Use appropriate compensating cables with the same material of the
thermocouple in order to connect it to the instrument. Check if the thermocouple
polarity is equal to those of the terminals.
Grounded
-
+
6 5
Channel 2
Note 1: Keep shielded wire disconnected at this end.
Note 1
-
+
4
3
2
1
Channel 1
Figure 6 - Thermocouple Input
DMY-2011, DMY-2035 and DMY-2036
Thermocouple
Twisted or
shielded pair
Channel 2
Ungrounded
Note 1
-
+
-
+
6 5
4
3
2
1
Channel 1
Installation
Page 10
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