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Installation Manual 37
Output Wiring – Model 1700/2700 Intrinsically Safe Transmitters
Output Wiring – Configurable I/O SpecificationsOutput Wiring – Fieldbus/PROFIBUSOutput Wiring – Intrinsically Safe
Figure 5-6 Safe area frequency/discrete output load resistance values
5.4 Hazardous area output wiring
The following notes and diagrams are designed to be used as a guide for wiring the Model 1700 or
Model 2700 outputs for hazardous area applications.
5.4.1 Hazardous area safety parameters
The proper barrier selection will depend on what output is desired, which approval is applicable, and
many installation-specific parameters. The information that is provided about I.S. barrier selection is
intended as an overview. Refer to barrier manufacturers for more detailed information regarding the
use of their products. Application-specific questions should be addressed to the barrier manufacturer
or to Micro Motion.
WARNING
Hazardous voltage can cause severe injury or death.
To reduce the risk of hazardous voltage, shut off the power before wiring the
transmitter outputs.
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
5 7 9 11 13 15 17 19 21 23 25 27 29
R
max
= (V
supply
– 4)/0.003
R
min
= (V
supply
– 25)/0.006
Absolute minimum = 100 ohms for supply voltage less than 25.6 Volts
Supply voltage VDC (Volts)
External pull-up resistor R
load
range (Ohms)
OPERATING REGION