VXI VT1422A - Manual (Page 44)

44 Field Wiring Chapter 2
Reference Temperature Sensing with the VT1422A
The Screw Terminal and Spring Terminal Modules provide an on-board thermistor
for sensing isothermal reference temperature of the terminal blocks. Also provided
is a jumper set (J1 in Figures 2-7 and 2-8) to route the VT1422A's on-board current
source to a thermistor or RTD on a remote isothermal reference block. Figure 2-7
and Figure 2-8 show connections for both local and remote sensing. See “Connecting
the On-Board Thermistor” on page 49 for location of J1.
VT1422A Terminal Module Field Wiring
On-Board
Current Source
REM
ON
BOARD
J1
HTI
LTI
HTS
LTS
Hnn
Lnn
Any Sense
Channel
Figure 2-7. On-Board Thermistor Connection
VT1422A Terminal Module Field Wiring
On-Board
Current Source
REM
ON
BOARD
J1
HTI
LTI
HTS
LTS
Hnn
Lnn
Any Sense
Channel
Figure 2-8. Remote Thermistor or RTD Connections