EFLOW EF-Series - Product Overview

EF-Series Instruction Manual
Rev 2/01 1-3
1.4 PRODUCT OVERVIEW
The eFlow EF-Series units are 32-bit microprocessor-based Electronic Flow Measurement (EFM)
computers that provide functions required for measuring the flow at a single meter run. The EF-Series
unit measures differential pressure, static pressure, and temperature; in addition, it provides the
functions required for gas orifice metering.
The EF-Series Unit computes gas flow for both volume and energy. The unit provides on-site
functionality and supports remote monitoring, measurement, data archival, and communications. The
design allows you to configure specific applications including those requiring gas flow calculations,
data archival, and remote communications.
The EF-Series Unit provides the following standard components and features:
♦ Weather-tight enclosure.
♦ Main Electronics Board.
♦ Built-in Liquid Crystal Display (LCD) with two-line alphanumeric viewing.
♦ A 32-bit microprocessor, 512K of flash ROM, and 512K of static memory storage.
♦ Built-in Sensor for orifice metering.
♦ Built-in Resistance Temperature Detector (RTD) input.
♦ Built-in Discrete Output (DO) for sampler or odorizer control.
♦ Up to 28 amp-hour battery capacity.
♦ Operator interface (LOI) port.
♦ Host communications port for optional communications card.
Physically, the unit consists of a printed-circuit Main Electronics Board and a display housed in a
compact, weather-tight case. The EF-Series unit is packaged in a NEMA 4 windowed enclosure that
can mount on a wall or a pipestand. A cover is provided for the display to protect it from adverse
weather conditions. Refer to Figure 1-1.
The steel enclosure protects the electronics from physical damage and harsh environments. The
enclosure consists of two pieces: the body and the door. A foam-rubber gasket seals the unit when the
hinged door is closed. The hinge, located on the left side, is stainless steel and fastened to the body
with machine screws, allowing removal of the door. The door is secured by a lockable hasp. Refer to
Figure 1-2 on page 1-13 for dimensional details.
The Main Electronics Board mounts on quick-fastener stand-offs located on top of the swing-out
panel. The dimensions of the board are approximately 5 by 7.5 inches. The majority of the
components are surface-mounted, with the top side of the board used for components. The Main
Electronics Board provides built-in I/O capabilities, an LCD display, and provisions for an optional
communications card. For more information on the Main Electronics Board, refer to Section 2.