4-20 mA Transmitter for Frequency, Rate or Period, DIN Rail, Dual Channel

Standard Features

Isolated 4-20 mA or 0-10V transmitter outputs, selectable.

Two independently field-scalable pulse input channels.

Frequencies from 0.005 Hz to 1 MHz.

Inputs from NPN or PNP proximity switches, contact closures, digital logic, magnetic pickups down to 12 mV, or AC inputs up to 250 Vac.

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

Output resolution: 0.025% of span (12 bits).

Output accuracy: ±0.05% of span.

High update rate.

Square root extraction standard.

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 $235 (basic pulse input transmitter)
Options:

Extended Main Board for rate and total simultaneously, custom curve linearization, arithmetic functions A+B, A-B, AxB, A/B, A/B-1 (draw).

Low voltage power, 10-48 Vdc or 12-30 Vac.

Description

The Laureate LTA-FR frequency, rate and period transmitter accepts two independently scalable input channels from a wide range of pulse sources, such as NPN or PNP proximity switches, contact closures, digital logic, magnetic pickups down to 12 mV, or AC voltages to 250 Vac. Input frequencies can range from 0.005 Hz to 1 MHz. The transmitter output can be selected as 4-20 mA, 0-20 mA or 0-10V, and is isolated to avoid ground loops. Applications include AC line frequency, RPM or speed from proximity switch inputs, and flow from turbine flow meter inputs.

With a Standard Main Board, the transmitter output can be scaled to track frequency in Hz, rate (such as gallons per minute), or period (inverse of frequency). Square root extraction is standard.
With an Extended Main Board, the transmitter output can track rate or totalized rate (such as gallons) whether the transducer output is linear, requires square root extraction, or requires custom curve linearization. The latter can be provided by a curvilinear spline fit with up to 180 data points. The transmitter can also count up to a preset total or down from a preset total to zero. Such applications typically make use of optional dual solid state relays, which are available as options. External reset of totals is via a special three-position screw terminal connector. The two input channels A & B can also be combined arithmetically to provide an analog transmitter output that tracks A+B (e.g., sum of two flows), A-B (e.g., difference of two flows), AxB (e.g., horsepower as product of force and RPM), A/B (ratio of two flow), and A/B-1 (draw or relative elongation of material between rollers).

Signal conditioner board used with 4-20 mA current transmitter for frequency, rate or period 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-FR 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).

Analog Input
Types Grounding Channel A Frequency Channel B Frequency Minimum Signal Maximum Signal Noise Filter Contact Debounce Time Base Accuracy	AC, pulses from NPN, PNP transistors, contact closures, magnetic pickups. Common ground for channels A & B 0.005 Hz to 1 MHz 0.005 Hz to 250 kHz 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) Quartz crystal calibrated to ±2 ppm
Analog Output (standard)
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 Programmed gate time + 30 ms + 0-2 signal periods 250V rms working, 2.3 kV rms per 1 minute test
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
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 Examples of Frequency / Rate Meters
AC Line Frequency
	Laureate frequency meters or transmitters will accept line voltages up to 250 Vac and display line frequency to 6-digit accuracy (50.0000 or 60.0000) in a few line cycles. Fast low frequency response is achieved by timing the period and taking its inverse.
RPM and Speed
	he Laureate frequency meters or transmitters can sense the low-level signals from magnetic pickups or the NPN or PNP transistor output of active sensors. These can be powered directly by the meter. Display in RPM or units of speed is achieved by mathematically scaling the meter.
Flow Rate and Simultaneous Total
	Laureate frequency meters or transmitters are compatible with all flow meters which generate pulses at a frequency proportional to flow rate. The Extended version can display scaled rate or total for the same input at the push of a button, and alarm from both the rate and total. The Extended version can also linearize flow transducers so as to extend their dynamic range.
Combining Two Rates
	Extended Laureate frequency meters or transmitters offers A+B, A-B and A/B arithmetic functions. A+B allows two input flows to be summed for total flow, while A-B allows outflow to be subtracted from inflow for net flow. Flow ratios aid in the proper mixing of ingredients
Custom Curve Linearization
	Extended Laureate frequency meters or transmitters can linearize the output turbine flow meters, which tend to be nonlinear on the low end. Linearizing improves the dynamic range and accuracy of turbine flow meters.
System-level Capabilities
The Laureate dual channel rate meters or transmitters can independently scale, display and alarm two pulse input channels. All signal or alarm data can further be transmitted via RS-232 or RS-485, including peak readings and arithmetic combinations of the two rates.

Quantity
Transmitter Type	LTA Laureate 4-20 mA Transmitter	$235
Main Board	6 Standard Main Board 8 Extended Main Board	NC $40
Main Board	With Standard Main Board: Scalable to ±999,999 for frequency, rate, square root of rate, up or down total, period, A-to-B time interval. With Extended Main Board: Above, plus rate and total simultaneously, ratio (A/B), draw (A/B-1), other arithmetic functions (AxB, A+B, A-B), phase angle, stopwatch, up/down counting, batching operation, linearization of nonlinear inputs.
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 Frequency	NC
Accessories	CBL04 RS-232 cable, TA to computer or USB adapter CBL02 USB to RS-232 cable adapter	$19 $39

Configured model number	TA600FR
Configured price per model	$235
Quantity	1
Extended price	$235

Laurel Electronics, Inc.
Industrial Instrumentation & Displays

3183-G Airway Avenue
Costa Mesa, CA 92626, USA

Tel:
Fax:

(714) 434-6131
(714) 434-3766

Email Laurel Electronics
Inquiry & RFQ Page

LTA-FR 4-20 mA Current Transmitter for Frequency, Rate or Period Input Dual channels. Rate and total in same transmitter. DIN Rail mounted, digitally programmable.

LTA-FR 4-20 mA Current Transmitter
for Frequency, Rate or Period Input
Dual channels. Rate and total in same transmitter.
DIN Rail mounted, digitally programmable.