Vertu Series VPM3000 Process Meters & Temperature Transmitters
Instruction Manual
13
Thermocouple and RTD
Connections
The following figures show examples for
thermocouple and RTD connections.
The RTD/TC selector switch must be set to the proper
position for the meter to accept the selected
temperature input.
The input type is selected using the
Setup
menu.
The selected thermocouple input must correspond to
the thermocouple sensor and wire type used.
Figure 18. Thermocouple Input Connections
Figure 19. 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 20. Two-Wire RTD Input Connections
Lead wire compensation for two-wire RTDs can be
applied using the
Adjust
menu. See
Figure 21. 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 provide accurate readings even
with long leads.
Serial Communication
Serial communication connection is made to an RJ11
connector labeled SERIAL. See Figures under
on page
Use APMA7232 for RS-232 interfacing.
Use APMA7422 for RS-485 interfacing.
Use APMA7420 for meter-to-meter interfacing for
cloning purposes (
i.e.
copying programmed settings
from one meter to other meters).
