Laurel Electronics LT: 4-20 mA & Serial Data Output Transmitter for Ratio - Manual (Page 4)

LAUREL ELECTRONICS INC. , 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel 714-434-6131 • www.laurels.com 4
Comparing Fluid Inflow & Outflow
The ratio of the inflow and outflow rates of a tank is a
measure of the relative filling or emptying rate. The same
transmitter can also be programmed to transmit the net inflow
or outflow rate in flow units, or to transmit totalized inflow our
outflow in volume units. Any of these parameters can be
alarmed using the dual relay board and be transmitted as
a 4-20 mA current loop and as serial data.
Controlling Coating Thickness on a Film
In this application, Channel A measures the rate at which
a coating material is applied, as measured by a flow meter,
while Channel B measures the speed of the film based on
pulses from a proximity switch. Transmitting and alarming the
A/B ratio assures that an even thickness of coating material is
applied as the speed of the film is varies.
Instrumenting a Pulsed Laser System
The dual-channel Laureate transmitter can measure the
speed of conveyor lines by using the output of proximity
switches which sense gear teeth or spokes of rotating drive
wheels. Transmitting the speed ratio of two lines allows line
speeds to be adjusted so that material arrives at work stations
when needed.
Measuring Draw for Elongation
Draw (Ch A / Ch B - 1) can be used to indicate the elongation
of films compressed between rollers, the shrinkage films, and
the RPM difference of rollers whose speed is varied to main-
tain tension. The high resolution of Laureate dual channel
transmitters is ideal for comparison of rates that are close to
each other.
Ordering Guide
Create a model a model number in this format: LT80FR, CBL04
Transmitter Type LT Laureate Transmitter
Main Board 8 Extended Main Board (required for arithmetic functions)
Power 0 Isolated 85-264 Vac
1 Isolated 12-32 Vac or 10-48 Vdc
Input Type FR Dual-Channel Frequency
Accessories CBL04 RS-232 cable, TA to computer or USB adapter
CBL02 USB to RS-232 cable adapter