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LT61VF1 DIN Rail Transmitter with 4-20 mA Analog Output, RS485 I/O, and Dual Relays

Scaled rate or total from 4-20 mA analog signals, 4-20 mA or 0-10V analog output plus RS232 or RS485 I/O and dual relays

Model LT61VF1 includes:

  • Scaled rate or total from 4-20 mA analog signals
  • 4-20 mA or 0-10V isolated analog output
  • Modbus or ASCII serial data output
  • Low voltage power 10-48 Vdc or 12-30 Vac
  • Two 120 mA solid state relays

  • 35 mm DIN rail mounting

Model LT61FR DIN rail transmitter by Laurel Electronics has Scaled rate or total from 4-20 mA analog signals, 4-20 mA or 0-10V analog output plus RS232 or RS485 I/O and dual relays. The model is configured for Standard main board and Low voltage power 10-48 Vdc or 12-30 Vac. It can track rate (such as gallons per minute or watts) or totalized rate (such as gallons or kilowatt hours) whether the transducer output is linear or requires square root extraction (differential pressure flow transducers).

The transmitter's signal conditioner board converts the full-scale 0-1 mA, 4-20 mA or 0-10 V analog signal to a frequency of 10 kHz to 110 kHz. This frequency is determined by measuring period over a selected gate time (from 10 ms to 200 s) and taking the inverse of period. At the lowest frequency of 10 kHz and the minimum gate time of 10 ms, the transmitter is capable of 25 updates per second. Scaling is done mathematically. Totals are stored in nonvolatile memory in case of power loss.

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 of Laurel Datalogging Software.

Standard features of Laureate 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.
  • Transducer excitation output, isolated. User selectable 5V@100 mA, 10V@120 mA or 24V@50 mA.
  • Universal AC power supply for 85-264 Vac.

For detailed transmitter information, specifications, dimensions and pricing, visit the following:

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