Omega Products FLSC-C1-LIQ Installation Manual
Model FLSC-C1-LIQ
Microprocessor Based
Loop Powered Transmitter
CONTENTS
1. Introduction------------------------------------------------------------ 2
2. Specifications----------------------------------------------------------- 3
3. Principle of Operation ----------------------------------------------- 4
3-1 Functional Blocks------------------------------------------------ 4
3-1-1 Preamplifier --------------------------------------------- 4
3-1-2 Microcontroller ----------------------------------------- 5
3-1-3 Loop Driver --------------------------------------------- 5
3-1-4 Communications Interface ---------------------------- 5
3-2 System Response Time------------------------------------------ 6
4. Installation-------------------------------------------------------------- 7
4-1 Typical Connections--------------------------------------------- 7
4-2 Communications Connections---------------------------------- 8
4-3 Wiring ------------------------------------------------------------- 8
Appendix A – Default Configuration----------------------------------- 9
Appendix B – Communications-----------------------------------------11
Message Format And Timeout --------------------------------------11
Messages ---------------------------------------------------------------13
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1. Introduction
The FLSC-C1-LIQ is a microprocessor based loop powered transmitter.
The transmitter accepts a low-level frequency signal on the input and
provides a 4-20mA analog output proportional to the flow rate. FLSCC1-LIQ is compatible with FTB100 and FTB200 Series Omega turbine
flowmeters as well as the FTB3000 series positive displacement
flowmeters.
The FLSC-C1-LIQ model provides for 20-point linearization of the
flow input signal and outputs a linearized analog current. FLSC-C1LIQ is fully configurable via an RS232 communications port located
under the top plate. FLSC-C1-LIQ configuration software is a
Windows based application that provides the interface for entering Kfactors, frequencies, the timebase for rate measurement, and calibration
of the analog output. Configuration and remote monitoring can also be
performed using any PC based communications program (e.g.,
HyperTerminal) or ASCII terminal.
The standard unit is packaged in an extruded aluminum enclosure for
wall mounting or may be mounted directly on a flowmeter using an
optional NEMA 4X or EX enclosure. An optional bracket is also
available for mounting on standard DIN rail.
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2. Specifications
Specifications
Input Signal Type: Magnetic pick up, Contact Closure
Input frequency range: 0.2 Hz to 4 KHz
Signal level: 10 mV rms to 30 Vdc
Power supply: Loop Power 8-30 Vdc
Reverse polarity protection
Analog Output: 4-20 mA
24 mA overflow condition
Load resistance: Max 650 Ohms at 24 Vdc
Accuracy: +/- 0.02% of full scale @ 20
Temperature drift: 40ppm/deg C
Communications RS232 port for Configuration and dia gn ost i cs
Operating temperature: -40
Humidity: 0-90% Non-condensing
o
to 85o C
Enclosure: Extruded aluminum, DIN rail mount, or
Explosion Proof
Regulatory: CE compliant
Options
20 point linearization
o
C
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3. Principle of Operation
The FLSC-C1-LIQ consists of two printed circuit boards and four main
functional blocks: the Preamplifier, Microcontroller, Loop Driver, and
Communications Interface.
PCA180
FLOWMETER INPUT
4-20 mA
PREAMP
CONDITIONED SIGNAL
4-20 mA
MICROCONTROLLER
LOOP
DRIVER
RS232
3-1 Functional Blocks
3-1-1 Preamplifier
The Preamplifier, located on PCA180, accepts the input from
the flowmeter. The Preamplifier applies amplification, low-pass
filtering, and wave-shaping to the input signal. The wave
shaping function converts the signal into a square-wave before
sending it to the Microcontroller.
PCA183
COMMUNICATIONS
INTERFACE
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3-1-2 Microcontroller
The Microcontroller, located on PCA183, accepts the squarewave output of the preamplifier and performs all of the
calculations that are required to control the Loop Driver. After
measuring the frequency of the square-wave, the
Microcontroller uses the following equations to compute the
flow rate and current.
flowrate
Where:
Kfactor = Is dependent on the Flow Calculation Method setting and
FM = Is the Flow rate Units setting of 0, 1, or 2. Where “0” is
CF = Is the Correction Factor setting.
Where:
AF = Is the 20 mA maximum Flow rate value.
If the calculated flowrate is greater than the AF setting, the
current will be set to 24mA to indicate an “Over-range”
condition. After calculating the current, the Microcontroller
digitally sends the current information to the Loop Driver.
3-1-3 Loop Driver
The loop driver, located on PCA183, uses the digital
information sent to it by the Microcontroller to set the current
of the loop. The Loop Driver also supplies power to the
Microcontroller.
frequency
FM
xCFx
60
Kfactor
is either the Average K-Factor or the Linearized K-Factor
from the Frequency / K-Factor table.
for Seconds, “1” is for Minutes, and “2” is for Hours.
mAxmAcurrent 164
flowrate
AF
3-1-4 Communications Interface
The Communications Interface, located on PCA183, provides
an RS232C port to the Microcontroller. The connector for the
communication interface may be accessed by removing the top
plate. The external terminal device provides power for the
Communication Interface. The Communications Interface is
used to configure and trouble-shoot the transmitter.
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