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Time Interval of Periodic Events
4-20 mA Current Transmitter
From
from 1 µs to 199.999 s. Resolution to 0.2 µs.
DIN Rail mounted, digitally
programmable.
Features
- Isolated 4-20 mA or 0-10V transmitter
outputs, selectable.
- For periodic events with
width from 1 µs to 199.999
s.
- Resolution to 0.2 µs.
-
Rep rated to 250 kHz.
- Inputs from NPN or PNP proximity
switches, contact closures, digital logic, magnetic pickups down to 12 mV, or AC inputs up
to 250 Vac.
- Trigger on positive or negative pulse
edges.
- Output resolution: 0.025% of span
(12 bits).
- Output accuracy:
±0.05%
of span.
- 5V, 10V or 15V dc excitation
output to power sensors.
- DIN rail mount package only 22.5 mm thick.
- Detachable screw clamp plug connectors.
- Easy setup using PC-based
Instrument Setup Software.
- Optional dual solid state relays for alarm or control.
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Description
The
Laureate 4-20 mA transmitter for periodic time events can transmit pulse width or time delay between
individual pulses to a resolution of 0.2 µs. It can also display average pulse width or average time delay between multiple
pulses.
Time interval is measured
between inputs on channels A and B. Timing starts when a pulse is applied
to Channel A (selectable positive or negative edge), and ends when a pulse is
applied to Channel B (selectable positive or negative edge). In case of a single pulsed
signal, the A and B inputs can be tied together. A positive or negative slope may be
selected to start timing, and the opposite slope must be selected to stop timing.
Timing is achieved by counting 5.5 MHz clock pulses. Multiple integral
time intervals are averaged over a gate time which is selectable from 10
ms to 199.99 s and also controls the maximum output rate.
 Universal Signal
Conditioner
The dual-channel signal
conditioner used for pulse detection accepts inputs from proximity switches with PNP or
NPN output, TTL or CMOS logic, magnetic pickups, contact closures, and other signals from
12 mV to 250 Vac. Jumper selections
provide optimum operation for different sensor types and noise
conditions. A built-in 5V, 10V or 15V dc
excitation supply can power proximity switches and other sensors, and eliminate the need
for an external power supply.
Transmitter Output
The analog transmitters
output can be selected as 4-20 mA or 0-10V, and is
isolated to avoid ground loops.
The output is generated by an ultra-linear 12-bit (4096 step)
digital-to-analog convert (DAC), whose span can be adjusted from 0
to ±999,999 internal counts and zero can be adjusted from -999,999 to
+999,999 internal counts. The analog output has a rated
accuracy of ±0.05% of
output span.
East to Set Up and Install
Transmitter programming is via
a three-terminal RS-232 port using Laurel's PC-based
Instrument Setup
Software. This software can be downloaded from this website at no
charge. The required transmitter-to-PC interface cable is available from
Laurel (P/N CBL03).
The
transmitters are housed in a DIN rail case that is only 22.5 mm (0.89")
thick. Signal connections are via detachable screw clamp plug connectors.
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Specifications
Laureate 4-20 mA Transmitter
for Periodic Timer Events
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Pulse Input |
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Types
Signal Ground
Minimum Signal
Maximum Signal
Maximum Frequency
Contact Debounce
Time Base Accuracy
Span Tempco
Long-term Drift |
AC,
pulses from NPN, PNP transistors, contact closures, magnetic pickups.
Common ground for channels A & B.
Nine ranges from (-12 to +12 mV) to (+1.25 to
+2.1V).
250 Vac
1 MHz, 30 kHz, 250 Hz (selectable).
0, 3, 50 ms (selectable).
Quartz crystal calibrated to ±2 ppm.
±1 ppm/°C (typ)
±5 ppm/year |
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Time Interval Mode |
Timing Start
Timing Stop
Update Rate
Gate Time
Time Before Zero Output |
Channel
A pulse, + or - edges
Channel B pulse, + or - edges
Gate time + 30 ms + 0-2 time intervals
Selectable 10 ms to 199.99 s
Selectable 10 ms to 199.99 s |
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Resolution |
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0 - 199.999 s
0 - 99.9999 s
0 - 9.99999 s
0 - .999999 s
0 - .099999 s
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1
ms
100 µs
10 µs
1 µs
0.2 µs (after averaging) |
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Analog Output |
Output Levels
Compliance, 4-20 mA
Compliance, 0-10V
Output Resolution
Output Accuracy
Output Update Rate
Output Isolation |
4-20 mA and 0-10 Vdc (selectable)
10V ( 0-500 ohm load )
2 mA ( 5 kOhm load )
12 bits (4,096 steps)
±0.05% of output span
Programmed gate time + 30 ms + 0-2 signal periods
250V rms working, 2.3 kV rms per 1 minute test |
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Transducer Excitation Output (standard) |
Jumper Selection 1
Jumper Selection 2
Jumper Selection 3 |
10V @ 60 mA, isolated to 50V from signal ground
5V @ 50 mA, isolated to 50V from signal ground
15V @ 60 mA, non-isolated |
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Dual Relay Output (optional) |
Relay Type
Load rating |
Two solid state relays, SPST, normally open,
Form A
120 mA at 130 Vac or 170 Vdc, 28 ohms series resistance. |
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Power Input |
Standard power
Low power option
Frequency
Power Isolation |
95-240V AC ±10% or 90-300V DC
12-30V AC or 10-48V DC
DC or 47-63 Hz
250V rms working, 2.3 kV rms per 1 min test. |
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Mechanical |
Case Dimensions
Case Mounting
Electrical Connections |
120 x 101 x 22.5 mm
35 mm rail per DIN EN 50022
Detachable screw clamp plug connectors |
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Environmental |
Operating Temperature
Storage Temperature
Relative Humidity |
0°C to
70°C
-40°C to 85°C
95% at 40°C, non-condensing |
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Typical Applications |
Time Interval Mode for Time Delay |
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For periodic pulses applied to A and B channels, time
delays can be measured down to 0.2 µs resolution from the rising or falling edge of A to
the rising or falling edge of B (selectable).
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Time Interval Mode for Pulse Width |
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The width of periodic pulses (t1 or t2) can be measured by
tying the A and B channels together. As for time delay, readings are averaged over a
user-selectable gate time. |
Timing Process Dynamics with a Panel Meter and Time
Interval Meter |
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The start and stop pulses used for timing can be generated
by the dual relay board in a Laureate panel meter, counter or transmitter. For instance,
the start and stop pulse edges can be created as temperature passes two alarm setpoints,
or temperature cycles in a hysteresis control mode.
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Replacing an Oscilloscope with a Laureate
Time Interval Meter |
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An oscilloscope is great for viewing and
timing pulses in a lab. However, in fixed installations where digital
timing accuracy and control outputs are required, a low-cost Laureate time
interval meter or transmitter will be the instrument of choice. Resolution to 0.2 µs is
feasible. |
Instrumenting a Pulsed Laser System |
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Some of the many possibilities in instrumenting a pulsed
laser system with Laureate dual-channel counters and transmitters: elapsed time, number
of pulses, pulse width, pulse separation, duty cycle, and pulse rep
rate.
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Pinout
Laureate 4-20 mA Transmitter
for Periodic Timer Events
(shown with optional dual relay
output)
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Transmitter
Powering a Single Sensor
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Transmitter
Powering Two Sensors |
Transmitter with Active or Passive Sensors |
Ordering
Guide
Laureate 4-20 mA Transmitter
for Periodic Timer Events
Create a model
number in this format: TA602FR. This is for a 4-20 mA transmitter,
Standard main board, 95-240 Vac power, isolated dual
solid state relays, and dual channel pulse input
signal conditioner. Includes detachable screw clamp
connectors.
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Transmitter
Type |
TA Laureate 4-20 mA Transmitter. |
$235 |
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Main
Board |
6 Standard Main Board. |
NC |
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Power |
0 Isolated 95-240 Vac & 90-300 Vdc.
1 Isolated 12-30 Vac & 10-48 Vdc. |
NC
$30 |
Setpoint
Output |
0 None.
2 Isolated Dual Solid State Relays. |
NC
$30 |
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Input
Type |
FR Dual Channel Pulse Input Signal Conditioner.
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NC |
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Accessories |
CBL03 RS-232 cable, TA to computer.
CBL02 USB to RS-232 cable adapter. |
$19
$39 |
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Order from
distributors for shipment to USA or Canada. |
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Order online for
international shipment. |
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