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1 Planning
Topics covered in this chapter:
•
Installation checklist
•
Best practices
•
Environmental limits
1.1 Installation checklist
□
Make sure that the hazardous area specified on the sensor approval tag is suitable
for the environment in which the sensor is installed.
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Verify that the local ambient and process temperatures are within the limits of the
sensor. See Environmental limits.
□
If your sensor has an integral transmitter, no wiring is required between the sensor
and transmitter. Follow the wiring instructions in the transmitter installation manual
for signal and power wiring.
□
If your transmitter has remote-mounted electronics, follow the instructions in this
manual for wiring between the sensor and the transmitter, and then follow the
instructions in the transmitter installation manual for power and signal wiring.
□
For the wiring between the sensor and the transmitter, consider maximum cable
lengths (see Table 1-1 and Table 1-2). The maximum distance between the sensor
and transmitter depends on the cable type. For all types of wiring, Micro Motion
recommends using Micro Motion cable.
Maximum lengths for Micro Motion cableTable 1-1:
Cable type To transmitter Maximum length
Micro Motion 4-wire All 4-wire MVD transmitters 1000 ft (300 m)
Maximum lengths for user-supplied 4-wire cableTable 1-2:
Wire function Wire size Maximum length
Power (VDC) 22 AWG (0,35 mm
2
) 300 ft (90 m)
20 AWG (0,5 mm
2
) 500 ft (150 m)
18 AWG (0,8 mm
2
) 1000 ft (300 m)
Signal (RS-485) 22 AWG (0,35 mm
2
) or larger 1000 ft (300 m)
□
For best performance, follow Micro Motion recommendations for sensor orientation
(see Table 1-3). The sensor will work in any orientation as long as the flow tubes
remain full of process fluid.
Planning
Installation Manual 1