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18 Micro Motion
®
Model 2400S Transmitters
I/O Wiring – Model 2400S Analog Transmitters
Figure 3-11 Output voltage vs. load resistance – Internal power
Figure 3-12 Recommended pull-up resistor versus supply voltage – External power
24
22
20
18
16
14
12
10
8
6
4
2
0
0 20000 40000 60000 80000 100000
High level output voltage (Volts)
Load resistance (Ohms)
Open circuit output
voltage = 24 VDC ±3%
OPERATING REGION
3
400
4400
4000
3600
3200
2800
2400
2000
1600
1200
800
6 9 12 15 18 21 24 27 30
Supply voltage (Volts)
External pull-up resistor range (Ohms)
Recommended
resistor value range
Note: When using a discrete output to drive a relay, choose external pull-up to limit current to
less than 500 mA.