4-20 mA Current Output Transmitter
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Description |
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| The Laureate 4-20 mA phase angle transmitter transmits the lead or lag in degrees from 0º to 360º between two periodic signals of the same period. In the illustration to the right, phase angle is 360*P1/P. The signals are applied to the Channel A and B inputs of the Laureate dual-channel pulse input signal conditioner board. A resolution of 1º, 0.1º or 0.01º is selectable. Accuracy is 0.01% up to 100 Hz, 0.1% at 1 kHz, and 1% at 10 kHz. |
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Phase angle is determined by timing crystal
clock pulses over a specified gate time which is selectable from 10 ms to 199.99 s. By
selecting the minimum gate time of 10 ms, the update rate can be up to 20/s for 50/60 Hz
AC line frequency. Improved accuracy is obtained by making the gate time long enough so
that multiple cycles can be averaged.Exceptional Accuracy and Stability. Laureate pulse input frequency and rate transmitters determine frequency by taking the inverse of period as measured with a calibrated quartz crystal time base. This results in extremely accurate and stable 6-digit internal readings (±999,999 counts), which are then processed in software. The analog output is generated by an ultra-linear 16-bit (65,536 step) digital-to-analog converter (DAC) for 0.02% output accuracy. The update rate of the transmitter output is a programmed gate time + 30 ms + 0-2 signal periods. For a 60 Hz signal, the update rate would be 20 per second. Such fast update rates are ideal for alarm and control. Standard features of Model LTA-PH include:
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 AC Phase Angle
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Phase Angle Mode |
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Item Transmitted |
Phase
angle difference between two waves of same period |
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Analog Output |
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Output Levels |
0-20 mA or 0-10 Vdc (selectable) |
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Inputs |
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Types |
AC,
pulses from NPN, PNP transistors, contact closures, |
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Update Rate |
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Conversion
Interval |
Gate
time + 30 ms + 0-2 signal periods |
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Sensor Excitation Output (standard) |
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Output Levels |
5V@100 mA, 10V@120 mA, 24V@50 mA (jumper
selectable) |
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Dual Relay Output (standard) |
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Relay Type |
Two solid state relays, SPST, normally open,
Form A |
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Serial Communications (standard) |
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Signal Types |
RS232 or RS485 (half or full duplex) |
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Power Input |
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Standard Power |
85-264 Vac or 90-300 Vdc (DC operation not UL approved) |
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Mechanical |
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Dimensions |
120 x 101 x 22.5 mm |
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Environmental |
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Operating
Temperature |
0°C
to 55°C |
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| Application Examples of Phase Meters |
Using Laureate Meters, Counters or Transmitters to Synchronize Motor Generators |
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Pinout
Laureate 4-20 mA Transmitter
for AC Phase Angle

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Ordering
Guide
Laureate 4-20 mA Transmitter
for AC Phase Angle
Click on the radio buttons to build a model number with pricing (shown below the Ordering Guide).
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