 |
|
 |
 |
|
|
|
Laurel Electronics provides
digital panel meters / controllers, totalizers, counters, loop-powered meters,
temperature meters, for all types of transducers or process indication &
control. |
|
|
|
|
Laureate™
Frequency, Rate & Period Meters
With
dual, independently field-scalable channels |
 |
|
|
|
|
Features |
|
Standard
Counter |
Two
independently field-scalable channels selected by front
panel pushbutton. |
Frequency
from 0.005 Hz to 1 MHz. |
Inputs
from NPN or PNP proximity switches, contact closures,
digital logic, magnetic pickups down to 12 mV, or AC
inputs up to 250 Vac. |
6-digit
resolution at update rates up to 25/s. |
Line
frequency measurement to 60.0000 in a few line cycles. |
Selectable
"count by" of 10 or 100 with rounding. |
Square
root extraction. |
Isolated
5, 10 or 24 Vdc excitation supply to power sensors. |
Green
or red LED display. |
NEMA-4X
(IP-65) front panel, 1/8 DIN case. |
Optional
dual relays, 4-20 mA & 0-10 V analog output, RS-232/485
I/O, parallel BCD output, low voltage AC or DC power. |
Certified
to UL 3101-1, CAN/CSA-C22.2, EN 61010-1 (CE Mark) |
|
Extended
Counter
All
capabilities of the Standard Counter, plus: |
Rate
and total simultaneously. |
Linearization
of non-linear inputs. |
Arithmetic
functions A+B, A-B, A*B, A/B, A/B-1 (draw). |
----------- |
Click
to Order Frequency Rate & Period Panel Meter
|
|
|
Description |
The
Laureate dual-channel frequency, rate and period meter
is a basic operating mode of the Laureate counter
with the FR signal conditioner board. It can display
frequency from 0 Hz to 1 MHz, rate in engineering
units, and period (inverse of frequency). The normal
displayed value can range up to 999,999 counts. Above
that level, the display will flash and go into four-digit
XXXXEX scientific notation. Square root extraction
is standard.
Each channel (A or B) may be independently
scaled for frequency, rate or period. The displayed
channel is selected via a front panel pushbutton.
Examples
of applications are the accurate display of AC line
frequency, RPM, speed from proximity switch inputs,
and flow from turbine flowmeter inputs.
|
|
|
| Fast,
High Resolution Measurement |
Extended
Counter Capabilities |
The
Laureate counter determines frequency by timing
an integral number of periods over a specified gate
time, and then taking the inverse of period. Rate
is obtained by multiplying the input by a scale
factor. The inverse period approach allows greater
accuracy and faster update times than conventional
meters which count signal pulses over a specified
time interval. AC line frequency may be accurately
measured to 50.0000 or 60.0000 in a few line cycles.
1000 Hz signals may be measured to 0.01 Hz resolution
at up to 25 per second. Fast response is ideal for
alarm and control applications.
To
reduce the effects of signal noise, a count by 10
or 100 feature with rounding is selectable. Variations
in the displayed reading can also be reduced by
selecting a longer gate time. An adaptive filter
can reduce variations due to noise while rapidly
responding to actual changes in the signal.
|
An
Extended counter version provides capabilities beyond
those of the standard counter:
Rate
and total simultaneously. One
channel can display total while the other displays rate.
The selection for either channel is via a front panel
pushbutton. This mode is ideal for flow applications
when the same signal is applied to both channels.
Linearization
of nonlinear inputs. Exceptionally
accurate custom curve linearization capability allows
linearization of the low end of turbine flowmeters.
For setup, up to 240 data points can be input into a
spreadsheet or text file by the user. The computer then
calculates nonlinear segments, which are downloaded
into the meter via RS-232. The Extended version allows
linearized rates to be totalized.
Arithmetic
functions. The Extended
counter makes arithmetic functions available, namely
A+B, A-B, A*B, A/B and A/B-1 (draw). For example, A+B
allows two input flows to be summed for total flow,
while A-B allows outflow to be subtracted from inflow
for net flow. If transducers with a frequency output
are used, A*B allows horsepower to be displayed based
measured torque and RPM, or based on force and velocity.
A/B can be used for the proper mixing of ingredients,
while A/B-1 (draw) is used to compare rates for stretching
or tensioning.
|
| Universal
Signal Conditioner |
Other
Features and Options |
| The
dual-channel signal conditioner accepts inputs from
proximity switches with PNP or NPN output, TTL or CMOS
logic, magnetic pickups, contact closures, low-level
outputs from turbine flow meters down to 12 mV, and
high-level AC line inputs up to 250 Vac. Nine
hysteresis and input levels are jumper selectable for
reliable counting. A 1600 Hz low-pass rolloff filter
and debounce times of 3 ms or 50 ms are also selectable.
A built-in isolated 5, 10, or 24 Vdc excitation supply
can power proximity switches and other sensors, and
eliminate the need for an external power supply.
|
Plug-in
isolated analog output, dual setpoint controller, and
RS232/485 serial data I/O or BCD output boards can upgrade
the Laureate from a stand-alone monitor to system interface
and control. Laureate meters and counters meet
NEMA 4X (IP-65) standards from the front for high pressure
washdown when panel mounted.
|
Click
to Order Frequency Rate & Period Panel Meter
|
|
|
Specifications |
| Display |
Excitation
Output |
Readout |
6
digits, 7-segment, 14.2 mm (.56") |
5
Vdc |
5
Vdc ±5%, 100 mA max |
Color |
Red
or green LED |
10
Vdc |
10
Vdc ±5%, 120 mA max |
Range |
-99999
to +99999 XXXXEX scientific notation beyond 999999 |
24
Vdc |
24
Vdc ±5%, 50 mA max
|
Indicators |
4
red LED lamps |
Output
isolation |
50
Vdc to meter ground |
Accuracy |
Electrical
Connections |
Time
Base |
Crystal
calibrated to ±2 ppm |
|
Span
Tempco |
±1
ppm/°C (typ) |
Long-term
Drift |
±5
ppm/year |
Conversion |
Power |
Frequency
Technique |
Inverse
period |
Voltage,
std.
|
85-264
Vac and 90-370 Vdc
|
Conversion
Time |
Gate
time + 30 ms+ 0-2 signal periods |
Frequency
|
DC
or 49-440 Hz
|
Gate
Time |
Selectable
10 ms to 199.99 s |
Voltage,
opt. |
8-28
Vac and 9-37 Vdc
|
Timeout
|
Selectable
10 ms to 199.99 s
|
Power
isolation |
Safety-rated
to 250 Vac, meter ground to earth ground,
DC to 60 Hz, 4.2 kVp per High Voltage Test |
Output
& Display Updates |
Same
as conversion time |
------ |
------ |
Inputs |
Types
|
AC,
pulses from NPN, PNP transistors, contact closures,
magnetic pickups |
Selectable
Hysteresis |
(-12
mV to +12 mV), (+30 mV to +60 mV),
(-30 mV to -20 mV), (-150 mV to +150 mV),
(+350 mV to +600 mV), (-600 mV to -350 mV),
(-1.15 V to +1.15 V), (+1.25 V to +2.1 V),
|
Grounding
|
Common
ground for channels A & B |
Channel
A Frequency |
0.005
Hz to 1 MHz |
Rolloff
Filter |
(-2.1
V to -1.25 V) |
Channel
B Frequency |
0.005
Hz to 250 kHz |
Debounce
Time |
Selectable,
none or 1600 Hz
Selectable 0, 3, 50 ms |
| Environmental |
Operating
Temperature |
0°C
to 55°C |
Storage
Temperature |
-40°C
to 85°C |
Relative
Humidity |
95%
at 40°C, non-condensing |
Protection |
NEMA-4X
(IP-65) when panel mounted |
Click
to Order Frequency Rate & Period Panel Meter
|
|
|
Typical
Applications |
|
AC
Line Frequency |
RPM
and Speed |
|
|
The
Laureate will accept line voltages up to 250 Vac
and display line frequency to 6-digit accuracy (50.0000
or 60.0000) in a few line cycles. Fast low frequency
response is achieved by timing the period and taking
its inverse |
|
The
Laureate can sense the low-level signals from magnetic
pickups or the NPN or PNP transistor output of active
sensors. These can be powered directly by the meter.
Display in RPM or units of speed is achieved by
mathematically scaling the meter. |
|
Flow
Rate and Simultaneous Total |
Combining
Two Rates |
 |
The
Laureate is compatible with all flowmeters which
generate pulses at a frequency proportional to flow
rate. The Extended version can display scaled rate
or total for the same input at the push of a button,
and alarm from both the rate and total. The Extended
version can also linearize flow transducers so as
to extend their dynamic range. |
|
The
Extended Laureate offers A+B, A-B and A/B arithmetic
functions. A+B allows two input flows to be summed
for total flow, while A-B allows outflow to be subtracted
from inflow for net flow. Flow ratios aid in the
proper mixing of ingredients |
|
Linearizing
Nonlinear Inputs |
 |
The Extended
Laureate can linearize pulse output flow meters,
which tend to be nonlinear on the low end. In particular,
linearizing improves the dynamic range and accuracy
of turbine flow meters. |
|
System-level
Capabilities |
|
|
The
Laureate dual channel rate meter can independently
scale, display and alarm two pulse input channels.
All signal or alarm data can further be transmitted
via RS-232 or RS-485, including peak readings and
arithmetic combinations of the two rates. The displayed
rates can also be transmitted as isolated parallel
BCD and isolated 4-20 mA analog output. |
Click
to Order Frequency Rate & Period Panel Meter
|
|
|
|
|
FLW,
Inc - 3505
Cadillac Ave - Bldg E - Costa Mesa, CA. - 92626 - USA - Ph (714) 751 -
7512 - Fax (714) 751 - 0213
|
|
 |
 |
 |
|
