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FieldPoint Operating Instructions
FP-RTD-122 and
cFP-RTD-122
Eight-Channel Three-Wire RTD and
Resistance Input Modules
These operating instructions describe how to install and use the
National Instruments FP-RTD-122 and cFP-RTD-122 three-wire
RTD and resistance input modules (referred to inclusively as the
[c]FP-RTD-122). For details on configuring and accessing the
[c]FP-RTD-122 over a network, refer to the user manual for the
FieldPoint network module you are using.
Features
The [c]FP-RTD-122 is a FieldPoint RTD and resistance input
module with the following features:
•
Inputs for 100 and 1,000
temperature detectors)
•
Built-in linearization for six TCR (temperature coefficient of
resistance, or alpha) values of RTDs
•
Direct resistance measurements in 400 and 4,000
•
True three-wire compensation
•
16-bit resolution
•
Filtering against 50 and 60 Hz noise
•
Hot swappable
•
2,300 V
rms
•
–40 to 70 °C operation
FieldPoint™, National Instruments™, NI™, and ni.com™ are trademarks of National Instruments Corporation.
Product and company names mentioned herein are trademarks or trade names of their respective companies.
For patents covering National Instruments products, refer to the appropriate location: Help»Patents in your software,
the patents.txt file on your CD, or ni.com/patents .
323348B-01
© 2002–2003 National Instruments Corp. All rights reserved.
transient overvoltage protection
April 2003
platinum RTDs (resistance
ranges
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Summary of Contents for National Instruments FieldPoint cFP-RTD-122
- Page 1 FieldPoint™, National Instruments™, NI™, and ni.com™ are trademarks of National Instruments Corporation. Product and company names mentioned herein are trademarks or trade names of their respective companies. For patents covering National Instruments products, refer to the appropriate location: Help»Patents in your software, the patents.txt file on your CD, or ni.com/patents .
- Page 2 Figure 1. Installing the FP-RTD-122 Installing the cFP-RTD-122 The cFP-RTD-122 mounts on a Compact FieldPoint backplane (cFP-BP-x), which provides operating power to the module. Installing the cFP-RTD-122 onto a powered backplane does not disrupt the operation of the bank. FP-RTD-122 and cFP-RTD-122 4 Key...
- Page 3 To install the cFP-RTD-122, refer to Figure 2 and complete the following steps: 1. Align the captive screws on the cFP-RTD-122 with the holes on the backplane. The alignment keys on the cFP-RTD-122 prevent backward insertion. 2. Press firmly to seat the cFP-RTD-122 on the backplane.
- Page 4 The FP-TB-x terminal bases have connections for each of the eight input channels on the FP-RTD-122. The cFP-CB-x connector blocks provide the same connections for the cFP-RTD-122. Table 1 lists the terminal assignments for the signals associated with each channel. The terminal assignments are the same for the FP-TB-x terminal bases and the cFP-CB-x connector blocks.
- Page 5 For the best accuracy, use the NI [c]FP-RTD-124 for input from four-wire RTDs. Otherwise, leave any one of the RTD wires unconnected and connect the remaining three as you would for a three-wire RTD. Refer to Figure 5. © National Instruments Corp. Pulsed [c]FP-RTD-122 SENSE...
- Page 6 Out of range [c]FP-RTD-122 ignores any configuration of RTD type for channels with resistance ranges selected. FP-RTD-122 and cFP-RTD-122 SENSE [c]FP-RTD-122 SENSE [c]FP-RTD-122 error for the affected channels. The nickel ni.com...
- Page 7 The variations are usually small, and the built-in linearization algorithms of the [c]FP-RTD-122 are appropriate for nearly all applications. © National Instruments Corp. nominal resistance, C. The most common TCR for C. It is defined in international standards...
- Page 8 The SENSE lead measures the resistance of the return COM lead. If the EX+ lead has the same resistance as the COM lead, the [c]FP-RTD-122 corrects for the FP-RTD-122 and cFP-RTD-122 + C T [1 + A T + B –1...
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Page 9: Status Indicators
When the network module recognizes the [c]FP-RTD-122, it sends initial configuration information to the [c]FP-RTD-122. After the [c]FP-AI-111 receives this initial information, the green READY indicator lights and the module is in normal operating mode. © National Instruments Corp. FP-RTD-122 and cFP-RTD-122... - Page 10 Mount terminal bases and backplanes in an area, position, or cabinet that prevents accidental or unauthorized access to wiring that carries hazardous voltages. FP-RTD-122 and cFP-RTD-122 and enter fpmatrix . Connect the...
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Page 11: Specifications
150 to 850 °C Resolution ... 0.016 °C Resistance accuracy Offset error, 400 15 to 35 °C ... 0.03 –40 to 70 °C... 0.08 © National Instruments Corp. –200 to 850 °C –328 to 1562 °F Error 15 to 35 °C Typical Maximum 0.15... - Page 12 Update rate... Each channel is updated Physical Characteristics Indicators ... Green POWER and Weight FP-RTD-122 ... 140 g (4.8 oz) cFP-RTD-122 ... 110 g (3.7 oz) Power Requirements Power from network module ... 350 mW Isolation Voltage Channel-to-channel isolation ... No isolation between Transient overvoltage...
- Page 13 Maximum altitude... 2,000 m; at higher altitudes Pollution Degree ... 2 Shock and Vibration These specifications apply only to the cFP-RTD-122. NI recommends Compact FieldPoint if your application is subject to shock and vibration. Operating vibration, random (IEC 60068-2-64)... 10–500 Hz, 5 g Operating vibration, sinusoidal (IEC 60068-2-6)...
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Page 14: Where To Go For Support
Mechanical Dimensions Figure 7 shows the mechanical dimensions of the FP-RTD-122 installed on a terminal base. If you are using the cFP-RTD-122, refer to the Compact FieldPoint controller user manual for the dimensions and cabling clearance requirements of the Compact FieldPoint system. - Page 15 Africa 27 0 11 805 8197, Spain 34 91 640 0085, Sweden 46 0 8 587 895 00, Switzerland 41 56 200 51 51, Taiwan 886 2 2528 7227, United Kingdom 44 0 1635 523545 © National Instruments Corp. FP-RTD-122 and cFP-RTD-122...
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