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

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 0.005 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

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 $275 (basic phase angle transmitter)
Options:

Low voltage power, 10-48 Vdc or 12-32 Vac

Description

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.

Phase angle measurement by phase transmitter

Signal conditioner board used with Laureate Phase Transmitter

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:

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).

Specifications
Laureate 4-20 mA Transmitter for AC Phase Angle

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 ) 16 bits (65,536 steps) 0.02% of output span plus conversion accuracy 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 130 mA at 140 Vac or 180 Vdc
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 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
Mechanical
Dimensions Mounting Electrical Connections	120 x 101 x 22.5 mm 35 mm rail per DIN EN 50022 Plug-in screw-clamp connectors
Environmental
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.

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
Laureate 4-20 mA Transmitter for AC Phase Angle

Ac transmitter

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).

Quantity
Transmitter Type	LTA Laureate 4-20 mA Transmitter	$235
Main Board	8 Extended Main Board (required for phase)	$40
Power	0 Isolated 85-264 Vac 1 Isolated 12-32 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, LTA to computer or USB adapter CBL02 USB to RS-232 cable adapter	$19 $39