National Instruments cFP-RTD-122 Bedienungsanleitung

323348B-01 April 2003© 2002–2003 National Instruments Corp. All rights reserved.FieldPoint™, National Instruments™, NI™, and ni.com™ are trademarks o

FP-RTD-122 and cFP-RTD-122 10 ni.comUpgrading the FieldPoint FirmwareYou may need to upgrade the FieldPoint firmware when you add new I/O modules to t

© National Instruments Corp. 11 FP-RTD-122 and cFP-RTD-122• Operate the [c]FP-RTD-122 only at or below Pollution Degree 2. Pollution Degree 2 means th

FP-RTD-122 and cFP-RTD-122 12 ni.comOffset error, 4,000 Ω range15 to 35 °C ...0.2 Ω typ, 0.7 Ω max–40 to 70 °C...

© National Instruments Corp. 13 FP-RTD-122 and cFP-RTD-122Maximum altitude...2,000 m; at higher altitudes the isolation volt

FP-RTD-122 and cFP-RTD-122 14 ni.comCE ComplianceThis product meets the essential requirements of applicable European Directives, as amended for CE Ma

© National Instruments Corp. 15 FP-RTD-122 and cFP-RTD-122Go to ni.com/support for the most current manuals, examples, and troubleshooting information

FP-RTD-122 and cFP-RTD-122 2 ni.comInstalling the FP-RTD-122The FP-RTD-122 mounts on a FieldPoint terminal base (FP-TB-x), which provides operating po

© National Instruments Corp. 3 FP-RTD-122 and cFP-RTD-122To install the cFP-RTD-122, refer to Figure 2 and complete the following steps:1. Align the c

FP-RTD-122 and cFP-RTD-122 4 ni.comWiring the [c]FP-RTD-122The FP-TB-x terminal bases have connections for each of the eight input channels on the FP-

© National Instruments Corp. 5 FP-RTD-122 and cFP-RTD-122Figure 3. [c]FP-RTD-122 Input CircuitryTaking Measurements from Three-Wire RTDsThree-wire RT

FP-RTD-122 and cFP-RTD-122 6 ni.comFigure 5. Four-Wire RTD Connections on One ChannelTaking Measurements from Two-Wire RTDsConnect either wire of a t

© National Instruments Corp. 7 FP-RTD-122 and cFP-RTD-122Converting Resistance Measurements to Temperature Measurements The [c]FP-RTD-122 has built-in

FP-RTD-122 and cFP-RTD-122 8 ni.comThe [c]FP-RTD-122 uses a linearization curve known as the Callendar-Van Dusen equation to measure the temperature o

© National Instruments Corp. 9 FP-RTD-122 and cFP-RTD-122effects of the leads. The only residual errors are those caused by mismatching the EX+ and CO