Sensia NuFlo Scanner 2000 - Section 1: Introduction and Specifications; Measurement Capabilities; Hardware Overview

7
Scanner
®
2000 microEFM for Foundation™ Fieldbus Section 1
Section 1—Introduction
The NuFlo™ Scanner
®
2000 microEFM for Foundation™ Fieldbus (Figure 1.1, page 8) is a FISCO-certied
ow computer that communicates via both RTU Modbus
®
and H1 eldbus protocol. The device computes
volumes of gas, liquid and steam using a differential pressure or pulse output from a primary metering device
and makes the data available for download via Modbus communications.
When properly congured, the device converts values from predened Modbus process variable registers to
Foundation™ eldbus signals for use in building eldbus control strategies. Additionally, other input values,
ow volumes, and calculations can be read by a eldbus host and recorded. For a complete list of parameters
supported by the device, see the Foundation™ Fieldbus Protocol Manual for Scanner 2000.
The Modbus to
Foundation™ eldbus conversion is made possible by an integrated eldbus module. The
module is connected to the Scanner 2000 main circuitry by way of a second “interface” board which receives
the power/communications input from the eldbus network, and facilitates communications between the
main board and the eldbus module. The three boards, a switchplate with display, and a lithium battery pack
are housed inside a compact aluminum alloy enclosure. The device is rated for intrinsic safety, and is ATEX
approved for use in hazardous areas.
A customer-supplied eldbus power supply is the primary power source. However, should the primary power
supply be lost, the lithium battery pack independently powers the unit to sustain data collection.
Static pressure and differential pressure inputs are supplied via an integral multi-variable transmitter. The
Scanner 2000 also supports inputs for process temperature (RTD) and turbine signals, a digital output, and an
optional external communications adapter. For a complete list of specications, see Table 1.1, page 11.
The Scanner 2000’s Modbus parameters are congured using ModWorX Pro, a full-featured software
application supplied with every Scanner 2000 shipment, providing on-screen tools for conguring hardware
and ow calculations, calibrating inputs, and collecting and viewing ow history. Basic settings can also be
changed using the keypad on the front of the instrument. See Section 4—Scanner 2000 Conguration and
Operation, page 55, for details.
Fieldbus communications are congured using a customer-supplied conguration tool. See Section 5—
Fieldbus Conguration and Operation, page 63, for instructions on conguring
Foundation™ eldbus
parameters.
Note The Scanner 2000 for Foundation™ Fieldbus will be referred to as simply Scanner 2000 throughout
this document.
MeasurementCapabilities
The Scanner 2000 microEFM measures and computes standard volumes of gas, steam, petroleum liquids,
and generic liquids with a high degree of accuracy. These measurements can be combined with a process
temperature input to yield compensated liquid measurements as well.
Gas, liquid, and steam measurements are typically based on the differential pressure output of an orice
plate, cone meter, or averaging pitot tube (such as Annubar
®
), or the linear pulse output of a turbine, positive
displacement or vortex owmeter.
The Scanner 2000 reliably supports AGA-3, ISO-5167 liquid measurement, and AGA-7 gas measurement.