![Emerson DL8000 Instruction Manual Download Page 88](http://html.mh-extra.com/html/emerson/dl8000/dl8000_instruction-manual_102194088.webp)
DL8000 Preset Instruction Manual
A-6
Glossary
Revised February-2016
LOI
Local Operator Interface (or Local Port). Refers to the serial EIA-232 (RS-232) port on
the ROC through which local communications are established, typically for
configuration software running on a PC.
LPM
Lightning Protection Module; a device that provides lightning and power surge
protection for ROCs.
LRC
Longitudinal Redundancy Checking error checking.
M
m
Meter.
mA
Milliamp(s); one thousandth of an ampere.
MAC Address
Media Access Control Address; a hardware address that uniquely identifies each node
of a network.
Manual mode
For a ROC, indicates that the I/O scanning has been disabled.
MAU
Medium Attachment Unit.
MCU
Master Controller Unit.
Meter Factor
A number obtained by dividing the actual volume of liquid passed through a flow meter
during a meter proving operation by the volume registered by the flow meter. The
meter factor is used in flow calculations to correct the
indicated volume
(end flow meter
registration minus start flow meter registration) to the observed
gross volume
(actual
flow meter throughput at operating conditions).
Meter factor = (Meter prover volume corrected to standard conditions)
÷
(Flow meter
indicated volume corrected to std conditions)
Meter Proving
A procedure used to determine the meter factor for a flow meter. The K-factor (exact
number of pulses per a volume unit that a flow meter generates) is determined at the
factory. The K-factor is used to derive a mathematical factor, known as meter factor,
which is used to adjust results of the internal flow calculations the DL8000 performs.
Note
: The flow meter is not re-calibrated; determining the meter factor allows the
operator to manually re-calibrate the DL8000
so that the flow meter’s
nonadjustable calibration characteristic [pulses per volume unit (K-factor)] are
incorporated into the flow calculations.
Modbus
A popular device communications protocol developed by Gould-Modicon.
MPU
Micro-Processor Unit.
mm
Millimeter.
MMBTU
Million British Thermal Units.
msec
Millisecond, or 0.001 second.
MVS
Multi-Variable Sensor. A device that provides differential pressure, static pressure, and
temperature inputs to a ROC for orifice flow calculations.
mV
Millivolts, or 0.001 volt.
mW
Milliwatts, or 0.001 watt.
N
NEC
National Electrical Code.
NEMA
National Electrical Manufacturer’s Association. See http://www.nema.org.
O
OH
Off-Hook modem communications signal.
Off-line
Accomplished while the target device is not connected (by a communications link). For
example, “off-line configuration” refers to configuring an electronic file that is later
loaded into a ROC.