Cameron NUFLO MC-III EXP, User Manual

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8
Section 1 MC-III™ EXP Flow Analyzer
Multipoint Linearization
The MC-III interface software supports up to 12 calibration points in addition to single-point calibration based
on the K-factor provided with the turbine flowmeter. See
K-Factor Type, page 62
, for more information.
Gas Volume Correction
Gas turbine meters are calibrated in actual cubic feet (ACF), and measure gas in actual cubic feet. In some
applications, a user may benefit from referencing gas measurements back to standard conditions by measuring
in terms of standard cubic feet (SCF). The MC-III EXP makes this process quick and easy, by using fixed
average values for the flowing gas temperature and flowing gas pressure. See
Gas Volume Correction, page 64
,
for more information.
Input Options
The flowmeter signal can be obtained from a magnetic pickup or a pre-amplifier device. The sensitivity of the
flowmeter input may be adjusted with the instrument keypad or the interface software. See
Section 2, page 13 ,
for wiring diagrams. See
Section 3, page 30,
and
Section 4, page 41,
for configuration procedures.
Output Options
The MC-III EXP standard circuitry provides:
• a scaled pulse output representing an increment in volume for each pulse
•
a loop-powered 4-20 mA output representing the flow rate
• a flowmeter frequency output for use with remote equipment to derive flow rate and volume
• an RS-485 output for communication with interface software or other telemetry equipment
When the 4-20 mA rate output feature is used, the MC-III EXP is powered by the current loop, and the lithium
battery or alkaline battery pack is used as a backup supply.
The pulse output and 4-20 mA output features should be turned off when not required for reduced current
consumption. See
Section 2, page 13 ,
for wiring diagrams. See
Section 3, page 30,
and
Section 4, page 41,
for
configuration procedures.
Flow Log Archival
The MC-III EXP saves up to 384 daily logs and 768 hourly logs in nonvolatile memory. By connecting with
the interface software, users can download the logs for viewing and/or printing in tabular format or in a trend
chart.
Users can also export daily and hourly logs to a spreadsheet. For more information, see
Section 5, page 76
.
Event Log Archival
The MC-III EXP saves up to 345 user event logs. Event logs are generated to track user changes such as K-
Factor changes, input setting changes, power-on reset and “watch-dog” reset, flow cut-off and frequency cut-
off.
By connecting with the interface software, users can download the logs for viewing and/or printing in tabular
format. In addition to showing old and new values, each event log is time-stamped, and includes the register
associated with the change. For more information, see
Section 5, page 76
.
Password-Protected Security
A keypad security access code prevents unauthorized personnel from altering the calibration or accumulated
volume data in the instrument. The security feature may be disabled if this protection is not required.