Laurel Electronics LTE SERIES TRANSMITTERS ANALOG INPUT User Manual
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4. PRODUCT OVERVIEW
LTE Series transmitters duplicate the signal conditioning and signal processing features of their
1/8 DIN panel-mounted digital panel meter counterparts for exceptional accuracy at high read
rates. A wide range of analog signal sources are accommodated by five analog signal
conditioners, which are the same as for our panel meters:
• DC input for volts, amps, process signals (e.g., 4-20 mA), and strain gauges. Most sensitive
full scale input range of 200 mV. Built-in 5A current shunt.
• AC rms input for volts and amps. Can be AC or DC coupled. Built-in 5A current shunt.
• Load cell or microvolt input with selectable full scale input ranges from 20 mV to 500 mV.
• Thermocouple temperature input for seven thermocouple types.
• RTD temperature or Ohms input for Pt100, Ni120 or Cu10 RTDs, or 20Ω-200 kΩ resistance.
An isolated 4-20 mA, 0-20 mA or 0-10V output is standard.
This output is generated by an
ultra-
linear 16-bit digital to analog converter which tracks an internal linearized digital reading.
Isolated Ethernet communications are standard via an RJ45 connector for a 10/100BaseT
interface. Four serial communication protocols are understood by our transmitters: Modbus TCP,
Modbus RTU, Modbus ASCII, and Custom ASCII (a simpler protocol than Modbus).
An isolated transducer excitation output is standard. Three output levels are jumper selectable:
5V at 100 mA, 10V at 120 mA, or 24V at 50 mA. The factory default setting is 10V and can power
up to four 350 ohm load cells in parallel.
Two isolated solid state relays are standard. These are rated 120 mA at 140 Vac or 180 Vdc.
Power over Ethernet (PoE) operation is jumper selectable with the DC power option (10-48 Vdc).
Isolation to 250V rms is provided for power, signal input, analog output, relay outputs, and com-
munications. Isolation adds safety and avoids possible ground loops. The transducer excitation
output is isolated to ±50V from signal ground.
Internal jumpers are used to select the signal range and excitation level. The transmitter
configuration is specified by the model number on the transmitter label. A user can reconfigure
the transmitter by opening the case and moving jumpers.
Transmitter scaling is via serial connection to a PC using MS Windows based Instrument Setup
Software, which can be downloaded at no charge.