Emerson CMF200A - Manual (Page 11)

Installation Manual 9
Determining a Location
Maximum wiring distances
If the transmitter is mounted remotely from the sensor, the maximum distance between the sensor and
transmitter depends on cable type. See Table 2.
For high-temperature and extreme high-temperature ELITE sensors, note the following:
• For sensors with a Model 1700/2700 or a Model 2400S transmitter, the transmitter is considered to be
integrally mounted on the sensor, so Table 2 does not apply.
• For sensors with a junction box or core processor, the limits in Table 2 apply only to the wiring
between the junction box or core processor and a remotely-mounted transmitter. The length of the
flexible conduit on which the junction box or core processor is mounted does not need to be
considered.
Pipe run
Micro Motion sensors do not require a straight run of pipe upstream or downstream.
Valves
Meter zero can be adjusted for special circumstances. When zeroing is performed with the auto-zero feature of
the transmitter, it is necessary to halt flow through the sensor, with the sensor tubes full of process fluid at
typical process conditions. The valve used to halt flow in this situation should be downstream from the sensor.
It is also possible to restore the meter’s factory zero setting. For more information about zeroing, refer to the
instruction manual shipped with the transmitter.
Table 2 Maximum cable lengths
Cable type Wire size Maximum length
Micro Motion 9-wire to an MVD
transmitter or core processor Not applicable 60 feet (20 meters)
Micro Motion 9-wire to all other
transmitters Not applicable 1000 feet (300 meters)
Micro Motion 4-wire Not applicable 1000 feet (300 meters)
User-supplied 4-wire
Power wires (VDC) 22 AWG (0,35 mm 2 ) 300 feet (90 meters)
20 AWG (0,5 mm 2 ) 500 feet (150 meters)
18 AWG (0,8 mm 2 ) 1000 feet (300 meters)
Signal wires (RS-485) 22 AWG (0,35 mm 2 ) or larger 1000 feet (300 meters)