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4-20 mA Current Output Transmitter
for Time Interval of Periodic Events
From
from 1 µs to 199.999 s. Resolution to 0.2 µs.
DIN Rail mounted, digitally
programmable.
Standard 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:
0.0015% of span (16 bits)
- Output accuracy:
±0.02%
of span
- DIN rail mount package only 22.5 mm thick
- Plug-in screw-clamp connectors
- Easy setup with PC-based
Instrument Setup Software
- 5V, 10V or 24V dc sensor excitation
output, isolated
- Dual solid state relays for alarm or control,
isolated
- RS232 or RS485 serial communications,
isolated
- Universal AC power, 85-264 Vac
- Priced at only $235
(basic time interval transmitter)
Options:
- Low voltage
power, 10-48 Vdc or 12-32 Vac
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Description
 The
Laureate
4-20 mA output, time interval transmitter can transmit pulse width or time delay between individual pulses to a
resolution of 0.2 µs for periodic events. It can also transmit 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.
 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 24V dc
excitation supply can power proximity switches and other sensors, and eliminate the need
for an external power supply.
Standard features of Laureate transmitters include:
-
Analog transmitter output, 16-bit, user scalable and isolated. User selectable 4-20 mA,
0-20 mA or 0-10V levels.
- Serial communications, isolated. User selectable RS232 or RS485, half or full duplex, Modbus or
Laurel ASCII protocol.
- Dual solid state relays for control or alarm, isolated.
Rated 120 mA at 130 Vac or 170 Vdc.
- Transducer excitation output, isolated. User selectable 5V@100 mA, 10V@120 mA or 24V@50
mA.
- Universal AC power supply for 85-264 Vac.
Easy Transmitter programming is via
Laurel's Instrument Setup Software,
which runs on a PC under MS Windows. This software can be downloaded from this website at no charge. The required transmitter-to-PC interface cable is available from
Laurel (P/N CBL04).
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Specifications
Laureate 4-20 mA Transmitter
for Time Interval of Periodic 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 |
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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 |
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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 )
16 bits (65,536 steps)
±0.02% 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) |
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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) |
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Relay Type
Load Rating |
Two solid state relays, SPST, normally open,
Form A
130 mA at 140 Vac or 180 Vdc |
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Power Input |
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Standard Power
Low Power Option
Power Frequency
Power Isolation
Power Consumption |
85-264 Vac or 90-300 Vdc (DC operation not UL approved)
10-48 Vdc or 12-32 Vac
DC or 47-63 Hz
250V rms working, 2.3 kV rms per 1 min test
2W typical, 3W with max excitation output |
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Mechanical |
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Dimensions
Mounting
Electrical Connections |
120 x 101 x 22.5 mm
35 mm rail per DIN EN 50022
Plug-in screw-clamp connectors |
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Environmental |
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Operating
Temperature
Storage Temperature
Relative Humidity
Cooling Required |
0°C
to 55°C
-40°C to 85°C
95% at 40°C, non-condensing
Mount transmitters with ventilation holes at top and bottom.
Leave 6 mm (1/4") between transmitters, or force air with a fan. |
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Application Examples of
Time Interval Meters |
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. |
Pinout
Laureate 4-20 mA Transmitter
for Time Interval of Periodic Events
Ordering
Guide
Laureate 4-20 mA Transmitter
for Time Interval of Periodic Events
Click on the radio buttons to build a model number with pricing (shown below the Ordering Guide).
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