Modbus & Serial Output Thermocouple Transmitter

Exceptional linearity & accuracy at high update rates. DIN Rail mounted, digitally programmable.
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Modbus Transmitters for thermocouples
Key Features
  • Universal AC switching power supply for 85-264 Vac
  • DIN rail mount housing only 22.5 mm wide
  • Detachable screw-clamp connectors
  • User selectable 4-20 mA, 0-20 mA or 0-10 Vdc linearized analog output
  • Analog output resolution: 0.0015% of span (16 bits)
  • Dual solid state relays for alarm or control, isolated
  • Factory calibrated for thermocouple types J, K, T, E, N, R, S
  • RS232 or RS485 serial communications, half or full duplex, isolated
  • Modbus RTU, Modbus ASCII or Laurel ASCII protocol
  • Highly accurate and repeatable
  • Upscale or downscale open sensor indication
Standard Features
  • Output update rate to 60/sec
  • RS232 or RS485 serial communications, isolated
  • Universal AC power, 85-264 Vac
  • Easy setup with PC-based Instrument Setup Software
  • Priced at only $235 (basic temperature transmitter)
Options
  • Low voltage power, 10-48 Vdc or 12-32 Vac
Description

The Laureate Modbus & serial output  thermocouple transmitter provides a linearized, highly accurate, stable and repeatable transmitter output for thermocouple types J, K, T, E, N, R or S. The thermocouple or RTD type and temperature range, specified in °C or °F, are user-selectable.

Thermocouple signal conditioner board Digital calibration of all thermocouple ranges is performed the factory, with calibration data stored in EEPROM on the signal conditioner board. This allows signal conditioner boards and ranges to be changed in the field with no need for recalibration. Cold junction compensation automatically corrects for temperature variations at the thermocouple reference junction at the transmitter. Open sensor indication is standard and may be set up to indicate either upscale or downscale.

Fast update rates at up to 50 or 60 conversions per second while integrating the signal over a full power line cycle are provided by Concurrent Slope (Pat 5,262,780) analog-to-digital conversion. High read rate is ideal for peak or valley capture and for real-time computer interface and control.

LTM Series serial output transmitters send data via an isolated serial port, which is user configurable for RS232 or RS485 and full or half duplex operation. Three protocols are user selectable: Modbus RTU, Modbus ASCII, or Laurel ASCII. Modbus operation is fully compliant with Modbus Over Serial Line Specification V1.0 (2002). The Laurel ASCII protocol allows up to 31 Laureate devices to be addressed on the same RS485 data line. It is simpler than the Modbus protocol and is recommended when all devices are Laureates. It also allows use ofLaurel Datalogging Software.

Standard features of Laureate temperature transmitters 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.
  • Universal AC power supply for 85-264 Vac. Low voltage power of 10-48 Vdc or 12-32 Vac is optional.

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).