Laurel Electronics for Digital Panel Meters, Counters, Timers, Transmitters, Digital Displays

Digital Panel Meters - Counters - Timers
DIN Rail Transmitters - Large Digit Displays

    

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Duty Cycle Input
4-20 mA Current Transmitter
 Transmits ON or OFF period in percent of total period.
DIN Rail mounted, digitally programmable.

  Features

  • Isolated 4-20 mA or 0-10V transmitter outputs, selectable.
  • Transmits ON or OFF period as a percentage of total period.
  • Resolution of 1%, 0.1% or 0.01%.
  • Frequencies from 0.005 Hz to 10 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.
  • Triggers on positive or negative pulse edges.
  • 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.

4-20 mA current transmitter, duty cycle input
CE Mark       RoHS Mark

Description

Clock diagram, 4-20 mA duty cycle transmitter

The 4-20 mA output of the Laureate duty cycle transmitter tracks ON or OFF period as a percentage from 0% to 100% of total period of repetitive pulse trains. In the illustration, duty cycle is 100 x t/P. The transmitter determines duty cycle by averaging an integral number of periods over a gate time, which is selectable from 10 ms to 199.99 s. The same signal is applied to Channels A and B. The meter divides the average pulse width by the period between pulses and expresses this ratio in percent. A resolution of 1%, 0.1% or 0.01% is selectable. By selecting leading or falling pulse edges, the ON or OFF duty cycle can be transmitted.

Duty cycle measurement is used to monitor modulated proportional control systems and pulse-modulated systems, such as radar, lasers or packet radio. For long periods, duty cycle can be measured by using the A and B channels of the Laureate dual-channel counter to totalize AC line cycles and having the counter display the ratio of the two totals scaled to percent.

Signal conditioner board, 4-20 mA duty cycle transmitterUniversal 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.

Exceptional Accuracy and Stability

The 4-20 mA analog output is generated by an ultra-linear 12-bit (4096 step) digital-to-analog convert (DAC) whose output span can be adjusted from 0 to ±999,999 counts and zero can be adjusted from -999,999 to +999,999 counts. The analog output has a rated accuracy of ±0.05% of output span. The output update rate for a minimum timing interval is 20/sec at AC line frequencies.

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 connectors.

Specifications
 Laureate 4-20 mA Transmitter
Duty Cycle Input

Duty Cycle Mode
Item Displayed
Display Units
Frequency Range
Input Accuracy

ON or OFF duty cycle of periodic pulse waveshape
1%, 0.1%, 0.01%
0.005 Hz to 50 kHz
0.01%, 0.005 Hz to 500 Hz, 0.1% at 5 kHz, 1% at 50 kHz
Update Rate
Conversion Interval
Gate Time
Time Before Zero Output

Gate time + 30 ms + 0-2 signal periods
Selectable 10 ms to 199.99 s
Selectable 10 ms to 199.99 s
Pulse Input
Types
  
Grounding
Minimum Signal
Maximum Signal
Noise Filter
Contact Debounce

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).
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
25/sec max
250V rms working, 2.3 kV rms per 1 minute test
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
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.
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.
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
Environmental
Operating Temperature
Storage Temperature
Relative Humidity		 0°C to 70°C
-40°C to 85°C
95% at 40°C, non-condensing

Application Example

Duty Cycle and Elapsed Time of a Laser
phase3.gif (1965 bytes) Duty cycle can be used to indicate the ON time of a pulsed laser in relation to total time. Laureate counters and transmitters can also measure elapsed time, the number of pulses, average width in µs, the number of pulses, and total energy applied.

Pinout
 Laureate 4-20 mA Transmitter, Duty Cycle Input
(shown with optional dual relay output)

Pinout, 4-20 mA transmitter, duty-cycle input

                                   Transmitter Powering a Single Sensor
  

Pinout, 4-20 mA transmitter, duty-cycle input

 Pinout, 4-20 mA transmitter, duty-cycle input
Transmitter Powering Two Sensors Transmitter with Active or Passive Sensors

Ordering Guide
 Laureate 4-20 mA Transmitter, Duty Cycle Input

Create a model number in this format: TA802FR. This is for a 4-20 mA transmitter, Extended main board, 95-240 Vac power, isolated dual solid state relays, and dual channel pulse input signal conditioner. Includes detachable screw clamp connectors.
 
Transmitter
Type		 TA    Laureate 4-20 mA Transmitter. $235
Main Board 8  Extended Main Board (required for duty cycle). $40
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
Input Type FR  Dual-Channel Pulse Input.  NC
Accessories CBL03  RS-232 cable, TA to computer.
CBL02  USB to RS-232 cable adapter.		 $19
$39
 
Laurel Electronics domestic orders Order from distributors for shipment to USA or Canada.
Laurel Electronics international orders Order online for international shipment.

 

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Laurel Electronics, Inc.
Industrial Instrumentation & Displays
3183-G Airway Avenue
Costa Mesa, CA 92626, USA
Phone: (714) 434-6131
Fax:     (714) 434-3766

  
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