Emerson Fisher 4320 Manual de instrucciones descargar pdf (Pagina 26)

Instruction Manual

D103621X012

4320 Position Monitor

April 2014

Vent

WARNING

Personal injury or property damage can occur from cover failure due to overpressure. Ensure that the housing vent

opening is open and free of debris to prevent pressure buildup under the cover.

WARNING

This unit vents the supply medium into the surrounding atmosphere. When installing this unit in a non‐hazardous

(non‐classified) location in a confined area, with natural gas as the supply medium, you must remotely vent this unit to a

safe location. Failure to do so could result in personal injury or property damage from fire or explosion, and area

re‐classification.

When installing this unit in a hazardous (classified) location remote venting of the unit may be required, depending upon

the area classification, and as specified by the requirements of local, regional, and federal codes, rules and regulations.

Failure to do so when necessary could result in personal injury or property damage from fire or explosion, and area

re‐classification.

Vent line piping should comply with local and regional codes, should be as short as possible with a minimum inside

diameter of 12.7 mm (1/2‐inch), and few bends to reduce case pressure buildup.

To remotely vent the exhaust or to achieve IP67 protection, connect tubing and 1/4 NPT fittings to spool valve ports 3

and 5.

Communication Connections

A HART communicating device, such as a 475 or 375 Field Communicator, interfaces with the 4320 wireless position

monitor. Convenient termination points are located inside the front cover, as shown in figure 5. The

polarity-insensitive connection pins provide access to the Maintenance Port defined in the WirelessHART

specifications.

Wireless Communications

Devices in a WirelessHART network are time synchronized and send their data to the gateway at selectable update

rates. The update rates of the device have an effect on the number of devices that the gateway can service. For

example, if each device sent an update once per minute the gateway could support 100 devices.

Battery powered devices conserve energy by only sensing and transmitting data at the selectable update rate.

The faster the update rate the the shorter the life span of a power module. Figures 19, 20, 21, and 22 show the

correlation between power module life and update/sample rate, the number of sub-devices, temperature, and

actuations, respectively.

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Emerson Fisher 4320 Manual de instrucciones Pagina 26