Emerson Rosemount 2240S, Reference Manual, Page: 125 / 194

115
Reference Manual
00809-0100-2240, Rev DA
Service and Troubleshooting
October 2017
Service and Troubleshooting
6.2.7 Test and simulation
Test terminal for temperature elements
The Rosemount 2240S has a built-in simulator for temperature elements which allows you to verify the
measuring electronics.
The built-in test facility comprises one 100
±
0.1 Ohm resistor and four 10
±
0.1 Ohm resistors to simulate
a temperature element (RTD) with a long cable connection.
To check a measuring channel:
1. Connect the test terminals to the corresponding input terminals as shown in table Table 6-2 :
Table 6-2. Test terminal connections
2. Check the connected input channel. It should read 0
±
0.3°C (4-wire independent spot), 0
±
0.6°C
(3-wire independent spot) or 0±0.6°C (3-wire common return).
Figure 6-5. Test terminal for Temperature Elements
4-wire 3-wire 3-wire common return
(1)
1. To check a channel for 3-wire common return operation, the element on channel 1 must be
disconnected and replaced by the test terminal c and d connections
a - a
b - b
c - c
d - d
a - No connection
b - b
c - c
d - d
a - No connection
b - b
c - 1c
d - 1d
A
B
C
D