Cameron NUFLO 1141C, User Manual

Page: 9 / 120

Chapter 1: Overview and Specifications
9
Chapter
1
: Overview and Specifications
Overview of the Scanner
®
1141
The Scanner
®
1141 is an economical, single-stream or dual-stream measurement Remote Terminal
Unit (RTU) with flow and pressure control capability. It offers a powerful alternative to chart
recorders in gathering data for natural gas production and includes a full range of operator-selectable
mass, energy, and volume algorithms. The Scanner 1141 is Class I, Div. 2 certified by CSA (US and
Canada) for use in hazardous areas.
A serial MVT (multi-variable transducer) mounts directly to the Scanner 1141 to provide accurate,
low-cost measurement of static pressure, differential pressure, and temperature in a single device.
The MVT is connected to the Scanner 1141 with an interconnect board that also provides an RTD
input.
The 1141 also accepts static pressure, differential pressure, and temperature inputs from the NuFlo
MVX
®
-II multi-variable transmitter, as well as inputs from low-power (1-5 VDC) and 4-20 mA
transmitters, RTDs, and pulse-producing devices such as the NuFlo and Barton turbine meters.
The Scanner 1141 stores up to 60 days of flow history in nonvolatile memory with an audit trail of
all events, alarms, and user changes. A separate replaceable lithium backup battery secures this
information against power failures. Stored data can be downloaded on-site or communicated to a
central location.
An integral rechargeable battery module uses a solar panel and contains a temperature-compensated
charge controller and a 6V or 12V air-transportable, sealed lead acid (SLA) battery.
See Battery Charge Indicator , page 89 , for a description of the four basic states or stages of battery
charging.
The Scanner 1141 provides battery/power voltage for powering transmitters and communication
devices. A 12Vdc supply for powering transmitters and a 5-VDC, 200-mA supply is optionally
available for low-power radios. The Scanner 1141 communicates with local gas chromatographs,
and supports ScanCom and Modbus. Other custom protocols may also be supported. For remote
communications, the Scanner 1141 supports radio, modem, phone, and satellite access. An optional
lightning arrestor is also available. Currently, remote communication devices and lightning arrestors
require CSA special acceptance.
The power management system ensures that the Scanner 1141 consumes minimum power while
collecting and processing data.
Standard communications and status/pulse inputs are easily expanded.