ProtEX-MAX PD8-7000 Explosion-Proof Temperature Meter Instruction Manual
15
Signal Connections
Signal connections are made to a three-terminal connector labeled SIGNAL on Figure 2.
Thermocouple and RTD Connections
The following figures show examples for thermocouple and RTD connections.
The TYPE selector switch must be set to the proper position for the meter to accept the selected RTD or
TC input.
The RANGE selector switch is used to select 100-ohm platinum or 10-ohm copper RTD. The 1000-ohm
platinum RTD input uses the same setting as the 100-ohm RTD.
The input type is selected using the
Setup
menu.
The selected thermocouple input must correspond to the thermocouple sensor and wire type used.
The meter accepts two, three, or four-wire RTDs. The three-wire RTD connection has built-in lead wire
compensation.
Lead wire compensation for two-wire RTDs can be applied using the
Adjust
menu. See the Advanced
Features Menu on page 40.
The four-wire RTD connection is similar to the three-wire. One of the leads of a four-wire RTD is not
connected and may be clipped off.
The three-wire connection provides sufficient lead wire compensation to obtain accurate readings even
with long leads.
Figure 4. Thermocouple Input
Connections
Figure 5. Three-Wire RTD Input
Connections
Figure 6. Two-Wire RTD Input
Connections
Figure 7. Four-Wire RTD Input
Connections
SIGNAL
EXC
T+
COM
1
2
3
RTD
TYPE
TC
100
RANGE
10
M-LINK
1 2
3
4 5 6 7 8
-
+
TC
RTD
Sensor
SIGNAL
EXC
T+
COM
1
2
3
RTD
TYPE
TC
100
RANGE
10
M-LINK
1 2
3
4 5 6 7 8
RTD
Sensor
SIGNAL
EXC
T+
COM
1
2
3
RTD
TYPE
TC
100
RANGE
10
M-LINK
1 2
3
4 5 6 7 8
RTD
Sensor
SIGNAL
EXC
T+
COM
1
2
3
RTD
TYPE
TC
100
RANGE
10
M-LINK
1 2
3
4 5 6 7 8
NC
