Two / Three / Four Wire Rtd-Hookups; Figure 2.6 Two/Three/Four-Wire Rtd Wiring Hookup A) Rtd-1000 Ohm/Rtd-500 Ohm - Omega I Series User Manual

2.3.3 Two/Three/Four-Wire RTD
The figures below show the input connections and input connector jumpers
(shown in bold lines) required to hookup a 2-, 3- or 4-wire RTD.
Figure 2.6 a) RTD-1000 ohm and
500 ohm Wiring Hookup
The two-wire connection is simplest method, but does not compensate for
lead-wire temperature change and often requires calibration to cancel lead-wire
resistance offset.
The three-wire connection works best with RTD leads closely equal in resistance.
The device measures the RTD, plus upper and lower lead drop voltage and the
subtracts twice the measured drop in the lower supply current lead producing
excellent lead-resistance cancellation for balanced measurements.
The four-wire RTD hookup is applicable to unbalanced lead resistance and
enables the device to measure and subtract the lead voltage, which produces the
best lead-resistance cancellation.
When configuring your monitor, select RTD type and RTD value in the Input
Type menu (see Part 3).
If the input wires of the meter get disconnected or broken, it will display
+OPN "Input (+) Open" message except in case of 500/1000
RTD. In this case the display shows -OPN "Input (-) Open" message. For
safety purpose you may want to set up your alarm to be triggered when
input is open. See Alarm 1 & 2 chapters for details.
RTD (1000/500Ω) 4-Wire
RTD (1000/500Ω) 3-Wire
RTD (1000/500Ω) 2-Wire
b) RTD-100 ohm Wiring Hookup
9
RTD (100Ω) 4-Wire
RTD (100Ω) 3-Wire
RTD (100Ω) 2-Wire
2-wire