EF-Series Instruction Manual
Rev 2/01 1-5
The orifice-metering Sensor measures differential pressure and absolute or gauge (static) pressure by
converting the applied pressure to electrical signals and making the readings available to the Main
Electronics Board. The Sensor housing fastens to a flanged adapter, which in turn mounts with four
bolts to the bottom of the enclosure. The Sensor cable plugs directly into the Main Electronics Board.
For more information on the Sensor, refer to Section 4.
An RTD temperature probe typically mounts in a thermowell on the metering pipe. RTD wires
should be protected either by a metal sheath or conduit connected to a liquid-tight conduit fitting on the
bottom of the EF-Series enclosure. The RTD wires connect directly to the four-terminal RTD
connector on the Main Electronics Board inside the enclosure.
The built-in discrete output (DO) is capable of directly driving a sampler or odorizer. The DO may
be used as a Timed Duration Output (TDO).
The operator interface (LOI) port, located on the bottom left-hand side of the enclosure (refer to
Figure 1-1), provides for a direct, local link between the EF-Series Unit and a personal computer
through an Operator Interface Cable. With the personal computer running the ROCLINK
Configuration Software, you can configure the functionality of the unit and monitor its operation.
User-level security can be enabled or disabled for the LOI port.
The host communications port (located at COM1) is available for use with an optional
communications card to permit serial communication protocols, as well as dial-up modem
communications. User-level security can be enabled or disabled for the host communications port
The I/O parameters, Sensor inputs, flow calculations, power control, and security are configured and
accessed using the ROCLINK Configuration Software. Refer to the ROCLINK for Windows User
Manual (or the DOS-based ROCLINK user manual) for details concerning software capabilities.
The firmware, contained in flash ROM on the electronics board, determines much of the functionality
of the EF-Series Unit, such as:
♦
Memory logging of 240 alarms and 240 events.
♦
Archival of data for up to 15 history points for up to 35 days.
♦
Power cycling control for a radio or cell phone through the EIA-232 communications card.
♦
Flow calculations (AGA and API standards) for a single meter run.
♦
Communications support alarm call-in to host.
♦
User-level security.
Refer to Section 2.3 for more information about the functionality provided by the firmware.
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