Manual

Notes on RTD wiring

1. For maximum accuracy use 3-wire or 4-wire configurations with DIN Class A RTDs.

2. When using a 2-wire RTD, keep the lead length between the alligator clips of the general-

purpose connector and the RTD element as short as possible.

3. In 3-wire and 4-wire configurations, the wire size and length should be identical for all leads.

Option 2: RTD Measure Cable

IMPORTANT: Alligator clips on the connector/cable assembly must all be connected to something for

readings to take place!

RIO Measure Cable

P/N A900028-90500 general-purpose connector is used for connecting to RTD wires or terminals to obtain

temperature measurements directly from RTD devices. One pair of white and one pair of red Alligator clips

are suitable for connecting to 2-, 3-, or 4-wire RTDs.

2-wire RTDs

Connect the two Red clips to one wire/terminal of the

RTD. Connect the two White clips to the other

wire/terminal.

3-wire RTDs

3-wire RTDs have two wires/terminals that are the same

color. Connect the two Red clips to the wires/terminals of

the same color. Connect the two White clips to

the remaining wire/terminal.

4-wire RTDs

4-wire RTDs have two wires/terminals of one color and two

of another color. Connect the Red clips to each of two

wires/terminals of the same color. Connect the White clips

to each of two wires/terminals that are the other color.

Note: Restrictions apply for use of Intrinsically Save RIO4000 modules / MFT units in Hazardous

Areas. RTDs and / or RIO4000 modules must only be removed or replaced in non-hazardous areas.

RTDs, P/N A900442-00026 connectors and P/N A900028-90500 User Cable must only be connected to

the RIO4000 in a non-hazardous area. See the Intrinsically Safe Control Document in the Appendix

for more details.

2.2 Measure Mode User Interface

2.2.1 Install the RIO4000 module in one of the MFT bays and turn on the MFT. If no RTD is connected to the

RIO module, the corresponding Sx line on the display will indicate “No Probe.” Be sure the RTD type is

correct - if not correct, go to the RTD Sensor Module Setup display to change the type.