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

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LTA-PH 4-20 mA Current Transmitter
for AC Phase Angle Input
  Transmits angular phase offset in degrees of AC waveforms.
DIN Rail mounted, digitally programmable.

4-20 mA Current Transmitter, Phase Angle Input

 CE Mark      RoHS Mark

Standard Features

  • Isolated 4-20 mA or 0-10V transmitter outputs, selectable.
  • Transmits phase angle between two AC wave shapes of similar period.
  • Frequency from .005 Hz to 10 kHz.
  • Resolution of 1º, 0.1º or 0.01º.
  • .01% accuracy at AC line frequency.
  • Internal conversion of input to six-digit reading:
    - Digital span adjust from 0 to ±999,999.
    - Digital zero adjust from -999,999 to +999,999.
  • 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.
  • DIN rail mount package only 22.5 mm thick.
  • Detachable screw clamp plug 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, 95-240 Vac ±10%
  • Priced at only $275 (basic phase angle transmitter)
    Options:
  • Low voltage power, 10-48 Vdc or 12-30 Vac.

Description
  

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.

Phase angle measurement by phase transmitter
 
Signal conditioner board used with Laureate Phase TransmitterPhase 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:

  • 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 95-240 Vac ±10%.

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).

Specifications
 LTA-PH 4-20 mA Transmitter for AC Phase Angle Input

Phase Angle Mode
Item Transmitted
Transmitted Units
Frequency Range
Accuracy
Maximum Timing Interval

Phase angle difference between two waves of same period
1°, 0.1°, 0.01°
.005 Hz to 10 kHz
.01°, .005 Hz to 100 Hz, .1° at 1 kHz, 1° at 10 kHz
200 s
Analog Output
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,
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)
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
Sensor Excitation Output (standard)
Output levels
Output isolation		 5V@100 mA, 10V@120 mA, 24V@50 mA (jumper selectable)
50V from signal ground
Dual Relay Output (standard)
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)
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
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

Application Examples of Phase Meters

Using Laureate Meters, Counters or Transmitters to Synchronize Motor Generators

Using Laureate Meters, Counters or Transmitters to Synchronize Motor Generators

Synchronization of two motor generators requires that the two frequencies be identical, that the lines be in phase, and that the line voltages be close to each other. In this illustration, a single Laureate dual channel counter (or frequency transmitter) measures both frequencies to six-figure accuracy in a few line cycles. Another Laureate dual channel counter (or phase transmitter) measures phase angle to 0.1º resolution. Two Laureate AC RMS Voltmeters, which offer ranges of 200.00 V and 600.0 V, are used to display the two RMS voltage to 0.1% accuracy.

Pinout
 LTA-PHH 4-20 mA Transmitter for AC Phase Angle Input

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.

  Quantity
Transmitter Type TA    Laureate 4-20 mA Transmitter $235
Main Board 8  Extended Main Board (required for phase) $40
Power 0  Isolated 95-240 Vac ±10%
1  Isolated 12-30 Vac or 10-48 Vdc		 NC
$30
Setpoint Output 0  None
2  Isolated Dual Solid State Relays		 NC
NC
Input Type FR  Dual-Channel Pulse Input NC
Accessories CBL04  RS-232 cable, TA to computer or USB adapter
CBL02  USB to RS-232 cable adapter		 $19
$39
 
Configured model number LTA800FR
Configured price per model $275
Quantity 1
Extended price $275
 

 

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

  
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