Laurel-electronics LTE: Ethernet & 4-20 mA Output RTD Transmitter User Manual download pdf (Page 4)

LAUREL

ELECTRONICS INC., 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel 714-434-6131 • www.laurels.com 4

RTD Hookup

In 4-wire hookup, different pairs of leads are used to apply the

excitation current and sense the voltage drop across the RTD,

so that the IR drop across the excitation leads is not a factor.

In 3-wire hookup, the transmitter senses the combined voltage

drop across the RTD plus two excitation leads. It also senses the

voltage drop across one excitation lead, and then subtracts twice

this voltage from the combined total. This technique effectively

subtracts all lead resistance and compensates for ambient

temperature changes if the two excitation leads are identical.

In 2-wire hookup, the transmitter senses the combined voltage

drop across the RTD and both lead wires. The voltage drop

across the lead wires can be measured by shorting out the RTD

during transmitter setup, and this voltage is then automatically

subtracted from the combined total. However, changing resist-

ance of the lead wires due to ambient temperature changes will

not be compensated.

Ordering Guide

Create a model a model number in this format: LTE20P385C

Transmitter Type LTE Laureate 4-20 mA & Ethernet Transmitter

Main Board 2 Standard Main Board

Power 0 Isolated 85-264 Vac

1 Isolated 12-32 Vac or 10-48 Vdc

2 Power over Ethernet (PoE)

P385C Pt100 DIN RTD, -202°C to 850°C

P385F Pt100 DIN RTD, -331°F to 1562°F

P392C Pt100 ANSI RTD, -202°C to 631°C

P392F Pt100 ANSI RTD, -331°F to 1168°F

N672C Ni120 RTD, -100°C to +260°C

N672F Ni120 RTD, -148°F to +500°F

C427C Cu10 RTD, -100°C to +260°C

C427F Cu10 RTD, -148°F to +500°F

RTD Input

Note: The same signal conditioner board can be user configured for all RTD types

listed and °C or °F, as well as for resistance measurement.

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Laurel-electronics LTE: Ethernet & 4-20 mA Output RTD Transmitter User Manual Page 4