PD2-7000
Helios Large Display Temperature Meter Instruction Manual
13
Signal Connections
Signal connections are made to a three-terminal connector labeled SIGNAL on Figure 6.
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.
Figure 8. Thermocouple Input Connections
Figure 9. Three-Wire RTD Input Connections
The meter accepts two, three, or four-wire RTDs.
The three-wire RTD connection has built-in lead wire
compensation.
Figure 10. Two-Wire RTD Input
Connections
Lead wire compensation for two-wire RTDs can be
applied using the
Adjust
menu. See the Advanced
Features Menu on page 40.
Figure 11. Four-Wire RTD Input Connections
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.
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