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Instruction Manual
D103621X012
4320
January 2018
22
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 and 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. Connect tubing and 1/2 NPT fitting to case vent port.
Communication Connections
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 as defined in the
Wireless
HART specifications.
Wireless Communications
Devices in a
Wireless
HART 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 shorter the life span of a power module. Figures 16, 17, 18, and 19 show the correlation
between power module life and update/sample rate, the number of sub-devices, temperature, and actuations,
respectively.