Emerson CMF200A Maximum wiring distances, Maximum cable lengths, Pipe run, Valves

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.

Table 2 Maximum cable lengths

Cable type	Wire size	Maximum length
Micro Motion 9-wire to an MVD	Not applicable	60 feet (20 meters)
transmitter or core processor
Micro Motion 9-wire to all other	Not applicable	1000 feet (300 meters)
transmitters
Micro Motion 4-wire	Not applicable	1000 feet (300 meters)
User-supplied 4-wire
Power wires (VDC)	22 AWG (0,35 mm2)	300 feet (90 meters)
	20 AWG (0,5 mm2)	500 feet (150 meters)
	18 AWG (0,8 mm2)	1000 feet (300 meters)
Signal wires (RS-485)	22 AWG (0,35 mm2) or larger	1000 feet (300 meters)

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.

Installation Manual 9