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LTA-PH 4-20 mA Current Transmitter
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Standard Features
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Description |
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| The Laureate LTA-PH AC 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
LTA-PH 4-20 mA Transmitter
for AC Phase Angle Input
| Phase Angle Mode | |
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Item Transmitted Transmitted Units Frequency Range Accuracy Maximum Timing Interval |
Phase
angle difference between two waves of same period |
| Analog Output | |
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Output Levels Compliance, 4-20 mA Compliance, 0-10V Output Resolution Output Accuracy Output Isolation |
0-20 mA or 0-10 Vdc (selectable) 10V ( 0-500 ohm load ) 2 mA ( 5 kOhm load ) 12 bits (4,096 steps) ±0.05% of output span 250V rms working, 2.3 kV rms per 1 minute test |
| Inputs | |
| Types Signal ground Minimum Signal Maximum Signal Noise Filter Contact Debounce |
AC,
pulses from NPN, PNP transistors, contact closures, |
| Update Rate | |
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Conversion
Interval Gate Time Time Before Zero Output |
Gate
time + 30 ms + 0-2 signal periods |
| 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 |
| Dual Relay Output (standard) | |
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Relay Type Load rating |
Two solid state relays, SPST, normally open,
Form A 120 mA at 130 Vac or 170 Vdc, 28 ohms in series |
| 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. |
| Power Input | |
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Standard power Low power option Frequency Power Isolation |
95-240 Vac ±10% or 90-300 Vdc (DC operation not UL approved) 12-30 Vac or 10-48 Vdc DC or 47-63 Hz 250V rms working, 2.3 kV rms per 1 min test |
| Environmental | |
| Operating
Temperature Storage Temperature Relative Humidity Protection |
0°C
to 60°C -40°C to 85°C 95% at 40°C, non-condensing NEMA-4X (IP-65) when panel mounted |
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| Application Examples of Phase Meters |
Using Laureate Meters, Counters or Transmitters to Synchronize Motor Generators |
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Pinout
LTA-PHH 4-20 mA Transmitter
for AC Phase Angle Input

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Ordering
Guide
LTA-PH 4-20 mA Transmitter
for AC Phase Angle Input
Click
on the radio buttons to build a model number with pricing.
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Resource Pages |
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3183-G Airway Avenue Costa Mesa, CA 92626, USA |
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