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

Digital Panel Meters - Counters - Timers - DIN Rail Transmitters - Large Digit Displays

    

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LTA-ST 4-20 mA Current Transmitter for
Time of Single or Accumulated Events
 Resolution to 0.2 µs.  Duration to 999,999 hrs.
DIN Rail mounted, digitally programmable.

Standard Features

  • Isolated 4-20 mA or 0-10V transmitter outputs, selectable.
  • Times single event time or accumulated time of all events.
  • Timing resolution to 0.2 µs.
  • Timing duration to 999,999 hrs.
  • Inputs from NPN or PNP proximity switches, contact closures, digital logic, or magnetic pickups down to 12 mV.
  • Triggers on positive or negative pulse edges.
  • Output resolution:  0.0015% of span (16 bits).
  • Output accuracy: ±0.02% of span.
  • 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 stopwatch transmitter)
    Options:
  • Low voltage power, 10-48 Vdc or 12-30 Vac.

4-20 mA Current Transmitter, Stopwach for Single Events or Accumulated Events
CE Mark       RoHS Mark

Description

Stopwatch mode of Laureate digital stopwatch transmitterThe Laureate LTS-ST 4-20 mA stopwatch transmitter puts out an analog signal whose whose value tracks the time of single events which produce start and stop pulses, or accumulated time of multiple events. They can also time the width of a single pulse. The highest resolution is 0.2 µs, making the transmitters ideal for fast events. The longest timing interval is 999,999 hrs. For long events, the analog output is updated continuously during timing. There are two primary timing modes:

  • A-A Stopwatch Mode. Time is measured between a start pulse and a stop pulse, both on Channel A, from either the positive or negative edges.
      
  • A-B Stopwatch Mode. Time is measured between a start pulse on Channel A (positive or negative edge) and a stop pulse on Channel B (positive or negative edge). This mode allows inputs from different sources. In addition, the A and B inputs can be tied together to start the stopwatch with one polarity and stop it with the other polarity.

Event time (Item #1) is measured by counting 5.5 MHz clock pulses from a calibrated quartz crystal. The stopwatch output is updated during timing at a rate controlled by a gate time, up to 25/sec. Time is reset to zero when the next start pulse occurs. Accumulated time from multiple events up to 999,999 hours (Item #2) can also be tracked.

Signal conditioner board used with 4-20 mA current transmitter for frequency, rate or periodThe dual-channel signal conditioner used for pulse detection accepts inputs from proximity switches with PNP or NPN output, TTL or CMOS logic, magnetic pickups, contact closures, and other signals from 12 mV to 250 Vac. Jumper selections provide optimum operation for different sensor types and noise conditions. A built-in 5V, 10V or 24V dc excitation supply can power proximity switches and other sensors, and eliminate the need for an external power supply.

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).

Specifications
 LTA-ST 4-20 mA Transmitter for Time of Single or Accumulated Events

Pulse Input

Types

Signal Ground
Minimum Signal
Maximum Signal
Maximum Frequency
Contact Debounce
Time Base Accuracy
Span Tempco
Long-term Drift

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).
Quartz crystal calibrated to ±2 ppm.
±1 ppm/°C (typ)
±5 ppm/year
Analog Output
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 ( 0-600 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 Stopwatch Meters

Stopwatch Mode
Stopwatch mode of Laureate digital stopwatch transmitter The stopwatch mode is used to time single events between start and stop pulses on the same channel. Duration of a single wave shape can be measured by tying the A and B channels together.

Timing Process Dynamics
Timing process dynamics by Laureate digital stopwatch transmitter The start and stop pulses used for timing can be generated by the dual relays in a Laureate panel meter, counter, or transmitter. For instance, the start and stop pulse edges can be created as temperature passes two alarm setpoints, or as temperature cycles in a hysteresis control mode.

Replacing an Oscilloscope with a Laureate Meter or Transmitter

Replacing an oscilloscope by a Laureate digital stopwatch transmitter

 An oscilloscope is great for viewing and timing pulses in a lab. However, in fixed installations where digital timing accuracy and control outputs are required, a low-cost Laureate time interval meter or transmitter will be the instrument of choice. Resolution to 0.2 µs is feasible.

Instrumenting a Pulsed Laser System

Instrumenting a laser system using Laureate timers and stopwatches

Some of the many possibilities in instrumenting a pulsed laser system with Laureate dual-channel counters and transmitters: elapsed time, number of pulses, pulse width, pulse separation, duty cycle, and pulse rep rate.

Pinout
 LTA-ST 4-20 mA Transmitter for Time of Single or Accumulated Events

Ordering Guide
 LTA-ST 4-20 mA Transmitter for Time of Single or Accumulated Events
  Click on the radio buttons to build a model number with pricing.

  Quantity
Transmitter
Type		 TA    Laureate 4-20 mA Transmitter $235
Main Board 6  Standard Main Board NC
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 Signal Conditioner NC
Accessories CBL03  RS-232 cable, TA to computer or USB adapter
CBL02  USB to RS-232 cable adapter		 $19
$39
 
Configured model number LTA600FR
Configured price per model $235
Quantity 1
Extended price $235
 

 

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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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