LEFM 3xxCi User Manual
IB1406 Rev 12
Section 1
Page 3
August 2017
Introduction
Equipment Description
The Caldon* LEFM 3xxCi
1
ultrasonic flowmeter is a highly sophisticated bidirectional flow measurement
system that employs ultrasonic transit time to measure fluid velocity and volumetric flow rate. Its advanced
signal and data processing circuitry help ensure high accuracy and repeatability. The LEFM 3xxCi can be
configured to indicate direction of flow via either a quadrature pulse output or a digital signal. It can also be
configured to output positive flow pulses on one channel and negative flow pulses on the other.
The LEFM 3xxCi also contains an automatic fault detection system for verifying performance and alerting
personnel when abnormal operating conditions are detected. For ease of troubleshooting, the LEFM 3xxCi
provides easy-to-interpret diagnostic information via Modbus communications and the local display.
This manual provides detailed instructions on the installation and operation of the flowmeter to include the
viewing of flow parameters and interpretation of diagnostic data viewed via the transmitter’s display. Users
who require a more detailed view of diagnostic acoustic data can access the data via Cameron’s LEFMLink
software. The operation of this software is outside the scope of this manual. See the LEFMLink User
Manual for details.
The LEFM 3xxCi flowmeter has two basic components or subsystems:
•
A meter body, including up to eight pairs of transducers forming acoustic paths and a temperature
sensor
•
A transmitter(s) containing a readout display and acoustic data processing electronics
The meter body now has updated features that have been introduced in 2013. These features comply with
the requirements of Measurement Canada (PS-G-06), OIML R-137, and ISO 17089-1:2010. They include:
•
Removable manifold covers for easy access to the transducer components
•
Ability to seal the transmitter and meter body to all changes affecting metrological performance
•
Positive indication of the degradation in any primary seal with a secondary seal design that
complies with the requirements of ISA 12.27.01
The meter design typically mounts the transmitter to the meter body at the factory and the assembly is
shipped as one instrument, ready for installation. Remote-mount units are available, particularly when there
are extreme temperatures at the meter itself. This manual covers two different configurations. These are
described as follows:
1
The term 3xxCi encompasses all versions of the gas ultrasonic flowmeters. Specifically, the 340Ci (4-path), and the 380Ci (8-
path) models are covered. Further, different meter body configurations are covered.
