- OMEGA Engineering, Inc. Power Supply Product Manual

3... INTERFACE MODULES
USING THE OMP-MODL 3-45
For long lead wire runs and in applications in electrically noisy
environments, it is recommended that twisted pair and/or shielded
wire be used. If shielded wire is used, the shield at the OMP-MODL
end should be connected to an external earth ground (Figure 3... -
30) or if available, a grounded Shield connection provided on
another type installed interface module (such as the MLIM-1).
Range Excitation
Current
Range Excitation
Current
Res 200 ohm 1 mA Res 200,000 ohm 10 uA
Res 200 ohm 10 mA Res 400,000 ohm 10 uA
Res 400 ohm 1 mA RTD-100 ohm 300C 1 mA
Res 400 ohm 10 mA RTD-100 ohm 850C 1 mA
Res 2000ohm 100 uA RTD-1000 ohm 300C 100 uA
Res 4000 ohm 100 uA RTD-1000 ohm 850C 100 uA
Res 10,000 ohm 100 uA Therm -32 to 250C 10 uA
Res 20,000 ohm 100 uA Therm -4 to 250C 10 uA
Res 40,000 ohm 10 uA Therm +10 to 250C 10 uA
Res 100,000 ohm 10 uA Therm +25 to 250C 100 uA
Excitation Currents used for MLIM-4 Ranges
21 1211109876543
RTD Element
Cable Shield
A
C
Jumper
+
+
-
-
Excitation leads
ML127
Sense leads
Connect Shield to an Earth Ground
Figure 3... -30: 4-Wire Configuration