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4-20 mA Current Output Transmitter for
Time of Single
or Accumulated Events
Resolution to 0.2 µs.
Duration to 999,999 hrs.
DIN Rail mounted, digitally
programmable.

Standard Features
- Isolated 4-20 mA or 0-10V transmitter
outputs, selectable
- Times single event time
or accumulated time of all events
- Timing resolution to
0.2 µs
- Timing duration to 999,999 hrs
- Inputs from NPN or PNP proximity
switches, contact closures, digital logic, or magnetic pickups down to 12 mV.
- Triggers 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 stopwatch transmitter)
Options:
- Low voltage
power, 10-48 Vdc or 12-32 Vac
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Description
The
Laureate 4-20 mA stopwatch
transmitter puts out an analog signal whose whose value tracks the
time of single events which produce start and stop pulses, or accumulated
time of multiple events. They can also time the width of a single pulse.
The highest resolution is 0.2 µs, making the transmitters ideal for fast
events. The longest timing interval is 999,999 hrs. For long events, the
analog output
is updated continuously during timing. There are two primary timing modes:
- A-A Stopwatch Mode.
Time is measured between a start pulse and a
stop pulse, both on Channel A, from either the positive or negative edges.
- A-B Stopwatch Mode.
Time
is measured between a start pulse on Channel A (positive or negative edge) and a
stop pulse on Channel B (positive or negative edge). This mode allows inputs from
different sources. In addition, the A and B inputs can be tied together to start the stopwatch with one polarity and stop it with the other
polarity.
Event time (Item #1)
is measured by counting 5.5 MHz
clock pulses from a calibrated quartz crystal.
The stopwatch
output is updated during timing
at a rate controlled by a gate time, up to 25/sec. Time is reset to zero when the next start
pulse occurs. Accumulated time from multiple events up to 999,999 hours (Item #2)
can also be tracked.
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 Model
LTA-FR 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 of Single or Accumulated 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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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 ( 0-600 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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Sensor Excitation Output (standard) |
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Output Levels
Output Isolation |
5V@100 mA, 10V@120 mA, 24V@50 mA (jumper
selectable)
50V from signal ground |
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Dual Relay Output (standard) |
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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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Serial Communications (standard) |
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Signal Types
Data Rates
Output Isolation
Serial Protocols
Modbus Modes
Modbus Compliance
Digital Addressing |
RS232 or RS485 (half or full duplex)
300, 600, 1200, 2400, 4800, 9600, 19200 baud
250V rms working, 2.3 kV rms per 1 min test
Modbus RTU, Modbus ASCII, Laurel ASCII
RTU or ASCII
Modbus over Serial Line Specification V1.0 (2002)
247 Modbus addresses.
Up to 32 devices on an RS485 line w/o a repeater. |
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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
Stopwatch Meters |
Stopwatch Mode |
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The stopwatch mode is used to time single events between
start and stop pulses on the same channel. Duration of a single wave shape can be measured
by tying the A and B channels together. |
Timing Process Dynamics |
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The start and stop pulses used for timing can be generated
by the dual relays 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 as temperature cycles in a hysteresis control mode.
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Replacing an Oscilloscope with a Laureate
Meter or Transmitter |
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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 Time of Single or Accumulated Events


Ordering
Guide
Laureate 4-20 mA Transmitter
for Time of Single or Accumulated Events
Click on the radio buttons to build a model number with pricing (shown below the Ordering Guide).
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