National Instruments Network Router cFP RTD 122 User Manual

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 platinum RTDs (resistance  
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 ranges  
True three-wire compensation  
16-bit resolution  
Filtering against 50 and 60 Hz noise  
Hot swappable  
2,300 Vrms transient overvoltage protection  
–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  
April 2003  
© 2002–2003 National Instruments Corp. All rights reserved.  
 
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.  
3. Using a number 2 Phillips screwdriver with a shank of at least  
64 mm (2.5 in.) length, tighten the captive screws to 1.1 N m  
(10 lb in.) of torque. The nylon coating on the screws prevents  
them from loosening.  
4
3
5
2
4
2
1
1
2
3
cFP-RTD-122  
Captive Screws  
cFP Controller Module  
4
5
Screw Holes  
cFP Backplane  
Figure 2. Installing the cFP-RTD-122  
© National Instruments Corp.  
3
FP-RTD-122 and cFP-RTD-122  
 
 
Wiring the [c]FP-RTD-122  
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.  
Table 1. Terminal Assignments  
Terminal Numbers  
Channel  
EX+  
1
SENSE  
COM  
18  
0
1
2
3
4
5
6
7
2
4
3
20  
5
6
22  
7
8
24  
9
10  
12  
14  
16  
26  
11  
13  
15  
28  
30  
32  
If you are using shielded wiring, you can reduce input signal noise  
by connecting one end of the shield to the COM terminal. Do not  
connect the shield to any of the wires at the signal end.  
Taking RTD Measurements  
with the [c]FP-RTD-122  
The [c]FP-RTD-122 has eight input channels. All eight channels  
share a common ground reference that is isolated from other  
modules in the FieldPoint system. Each channel pulses a 0.25 mA  
excitation current out of the EX+ terminal. The excitation current  
returns through the COM terminal. The SENSE terminal measures  
resistance and compensates for lead resistance errors. Each  
channel is filtered, then sampled by a 16-bit analog-to-digital  
converter.  
FP-RTD-122 and cFP-RTD-122  
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EX+  
RTD  
Pulsed  
Input  
Circuitry  
16-bit  
ADC  
SENSE  
COM  
[c]FP-RTD-122  
Figure 3. [c]FP-RTD-122 Input Circuitry  
Taking Measurements from Three-Wire RTDs  
Three-wire RTDs often have a wire of one color (usually white,  
sometimes red) for positive excitation, and two wires of another  
color (usually red, sometimes black). Connect the positive  
excitation wire to the EX+ terminal of the module, and connect the  
other two wires to the SENSE and COM terminals.  
EX+  
3-wire RTD  
SENSE  
COM  
[c]FP-RTD-122  
Figure 4. Three-Wire RTD Connections on One Channel  
Taking Measurements from Four-Wire RTDs  
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.  
5
FP-RTD-122 and cFP-RTD-122  
 
Leave this wire  
unconnected  
EX+  
4-wire RTD  
SENSE  
COM  
[c]FP-RTD-122  
Figure 5. Four-Wire RTD Connections on One Channel  
Taking Measurements from Two-Wire RTDs  
Connect either wire of a two-wire RTD to the EX+ terminal and the  
other wire to the COM terminal, and connect a short jumper wire  
between the COM and SENSE terminals.  
EX+  
2-wire RTD  
SENSE  
Short Jumper Wire  
COM  
[c]FP-RTD-122  
Figure 6. Two-Wire RTD Connections on One Channel  
Measuring Resistance Directly  
You can use the [c]FP-RTD-122 to measure resistance in ohms.  
In this way, you can take measurements from RTDs of types that  
the [c]FP-RTD-122 does not directly support (such as 120 nickel  
RTDs) and from resistive devices other than RTDs. You can choose  
one of two resistance ranges: 0–400 and 0–4,000 . Resistance  
values outside the range you select, including open circuits, result  
in an Out of rangeerror for the affected channels. The  
[c]FP-RTD-122 ignores any configuration of RTD type for  
channels with resistance ranges selected.  
FP-RTD-122 and cFP-RTD-122  
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Converting Resistance Measurements  
to Temperature Measurements  
The [c]FP-RTD-122 has built-in linearization algorithms for  
platinum RTDs of either 100 or 1,000 nominal resistance,  
and for six TCR (or alpha, α) values. The TCR is the average  
temperature coefficient of resistance of an RTD from 0 to 100 °C.  
This document specifies TCR in units of m/Ω/°C.  
The [c]FP-RTD-122 linearizes resistance values and returns  
readings in units of temperature. The available ranges are  
73 to 1,123 K, –200 to 850 °C, and –328 to 1,562 °F. You can  
configure each channel independently, so you can connect different  
types of RTDs to each channel.  
Note You must configure each channel of the  
[c]FP-RTD-122 for the RTD type connected to it. The  
module does not automatically recognize RTD types.  
RTD Types  
RTD types are specified by material composition, nominal  
resistance at 0 °C, and TCR. The [c]FP-RTD-122 can directly  
measure the temperature of platinum RTDs of either 100 or  
1,000 nominal resistance. These RTDs are commonly referred to  
as PT100 or PT1000 RTDs, respectively.  
Different types of platinum RTDs have different TCRs. The  
[c]FP-RTD-122 supports the following TCRs: 3.750, 3.851, 3.911,  
3.916, 3.920, and 3.928 m/Ω/°C. The most common TCR for  
RTDs is 3.851 m/Ω/°C. It is defined in international standards  
such as IEC-751, DIN 43760, BS 1904, and ASTM E1137.  
The TCR of 3.928 m/Ω/°C is used in the reference function for  
platinum thermometers in the International Temperature Scale  
of 1990 (ITS-90) for high-accuracy metrology applications.  
Unfortunately, not all TCR values are as well defined by standards  
organizations, and the behavior of RTDs with the same TCR value  
may vary from vendor to vendor. 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.  
7
FP-RTD-122 and cFP-RTD-122  
 
The [c]FP-RTD-122 uses a linearization curve known as the  
Callendar-Van Dusen equation to measure the temperature of  
RTDs. The equation is as follows:  
Temperatures below 0 °C:  
RT = R0[1 + A × T + B × T2 + C × T3 × (T – 100 °C)]  
Temperatures above 0 °C:  
RT = R0[1 + A × T + B × T2]  
T = temperature in °C  
RT = RTD resistance at temperature T  
R0 = RTD nominal resistance at 0 °C  
A, B, C are coefficients given in Table 2.  
Table 2 lists the coefficients used in this equation for each of the  
TCR values that the [c]FP-RTD-122 supports. If you have a  
nonstandard RTD that does not match one of these linearization  
curves, measure the resistance with the [c]FP-RTD-122 and  
convert the resistance to temperature in the manner suggested by  
the RTD vendor.  
Table 2. Callendar-Van Dusen Coefficients Used by the [c]FP-RTD-122  
A
(°C)–1  
B
(°C)–2  
C
(°C)–4  
TCR  
m//°C  
3.750a  
3.851b  
3.911c  
3.916d  
3.920e  
3.928f  
3.81 × 10–3  
3.9083 × 10–3  
3.9692 × 10–3  
3.9739 × 10–3  
3.9787 × 10–3  
3.9888 × 10–3  
–6.02 × 10–7  
–5.775 × 10–7  
–5.8495 × 10–7 –4.233 × 10–12  
–5.870 × 10–7 –4.4 × 10–12  
–5.8686 × 10–7 –4.167 × 10–12  
–5.915 × 10–7 –3.85 × 10–12  
–6.0 × 10–12  
–4.183 × 10–12  
Three-Wire Compensation of Lead  
Resistance Errors  
The [c]FP-RTD-122 uses a three-wire compensation technique to  
compensate for the lead resistances. 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  
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effects of the leads. The only residual errors are those caused by  
mismatching the EX+ and COM leads. Most RTDs have lead  
resistances within 5% of each other, so the compensation of the  
[c]FP-RTD-122 corrects for 95% or more of the errors introduced  
by lead resistances. This is a more accurate method than the typical  
bridge completion methods described in many reference books.  
The bridge methods not only have the same sensitivity to lead  
resistance mismatch, but also are effective only for temperatures  
very near those at which the bridge is balanced (usually 0 °C).  
The temperature measurement accuracy specifications for the  
[c]FP-RTD-122 at the end of these instructions include the effects  
of a typical application using 10 m of 22 gauge copper wire  
(approximately 0.5 per lead), with 5% mismatch in the lead  
resistances. If you are using leads with greater resistances, the  
additional errors are approximately 3 °C per of mismatch in the  
lead resistances for 100 RTDs, and 0.3 °C per of mismatch in  
the lead resistance for 1,000 RTDs. For example, for 2 leads  
matched to 5% of each other, the lead resistance mismatch is  
5% × 2 = 0.1 , which would cause 0.3 °C of error in  
measurements of a 100 RTD.  
If you are using the [c]FP-RTD-122 with two-wire RTDs, the  
errors due to lead resistances are much greater because three-wire  
compensation is not used. With two-wire RTDs, the additional  
errors are approximately 3 °C per of the sum of the lead  
resistances for 100 RTDs, and 0.3 °C per of the sum of lead  
resistances for 1,000 RTDs. For example, a 1,000 two-wire  
RTD with 2 leads has a total lead resistance of 4 (2 per lead),  
which causes 1.2 °C of error.  
Status Indicators  
The [c]FP-RTD-122 has two green status LEDs, POWER and  
READY. After you insert the [c]FP-RTD-122 into a terminal base  
or backplane and apply power to the connected network module,  
the green POWER indicator lights and the [c]FP-RTD-122  
informs the network module of its presence. 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.  
9
FP-RTD-122 and cFP-RTD-122  
 
Upgrading the FieldPoint Firmware  
You may need to upgrade the FieldPoint firmware when you add  
new I/O modules to the FieldPoint system. For information on  
determining which firmware you need and how to upgrade your  
firmware, go to ni.com/info and enter fpmatrix.  
Isolation and Safety Guidelines  
Caution Read the following information before  
attempting to connect the [c]FP-RTD-122 to any circuits  
that may contain hazardous voltages.  
This section describes the isolation of the [c]FP-RTD-122 and its  
compliance with international safety standards. The field wiring  
connections are isolated from the backplane and the inter-module  
communication bus. The isolation is provided by the module,  
which has optical and galvanic isolation barriers designed and  
tested to protect against transient fault voltages of up to 2,300 Vrms  
.
Follow these guidelines to ensure a safe total system:  
The [c]FP-RTD-122 has a safety isolation barrier between the  
I/O channels and the inter-module communication bus. There  
is no isolation between channels unless otherwise noted. If any  
of the channels on a module are wired at a hazardous potential,  
make sure that all other devices or circuits connected to that  
module are properly insulated from human contact.  
Do not share the external supply voltages (the V and C  
terminals) with other devices (including other FieldPoint  
devices), unless those devices are isolated from human contact.  
For Compact FieldPoint, you must connect the protective earth  
(PE) ground terminal on the cFP-BP-x backplane to the system  
safety ground. The backplane PE ground terminal has the  
following symbol stamped beside it: . Connect the  
backplane PE ground terminal to the system safety ground  
using 14 AWG (1.6 mm) wire with a ring lug. Use the 5/16 in.  
panhead screw shipped with the backplane to secure the ring  
lug to the backplane PE ground terminal.  
As with any hazardous voltage wiring, make sure that all  
wiring and connections meet applicable electrical codes and  
commonsense practices. 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  
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Operate the [c]FP-RTD-122 only at or below Pollution  
Degree 2. Pollution Degree 2 means that only nonconductive  
pollution occurs in most cases. Occasionally, however, a  
temporary conductivity caused by condensation must be  
expected.  
Refer to the FieldPoint product label for regulatory  
certification under hazardous location standards. If the  
FieldPoint product is not certified for operation in hazardous  
locations, do not operate it in an explosive atmosphere or  
where there may be flammable gases or fumes.  
Specifications  
These specifications are typical for the range –40 to 70°C unless  
otherwise noted. Gain error is calculated as a percentage of input  
signal value.  
Input Characteristics  
Number of channels..........................8  
ADC resolution.................................16 bits  
Type of ADC.....................................Delta-sigma  
Input signal ranges (software selectable by channel)  
Temperature................................73 to 1123 K  
–200 to 850 °C  
–328 to 1562 °F  
Resistance...................................0 to 400 or 0 to 4,000 Ω  
Temperature accuracy (includes 5% matched,  
0.5 lead wires—10 m of 22 AWG copper)  
Error  
15 to 35 °C  
–40 to 70 °C  
Measured Value  
–200 to 150 °C  
150 to 850 °C  
Typical  
Maximum  
0.30  
Typical  
Maximum  
0.15  
0.25  
0.40  
0.90  
1.6  
3.0  
0.50  
Resolution.........................................0.016 °C  
Resistance accuracy  
Offset error, 400 range  
15 to 35 °C...........................0.03 typ, 0.08 max  
–40 to 70 °C.........................0.08 typ, 0.4 max  
© National Instruments Corp.  
11  
FP-RTD-122 and cFP-RTD-122  
 
Offset error, 4,000 range  
15 to 35 °C...........................0.2 typ, 0.7 max  
–40 to 70 °C.........................0.8 typ, 4.0 max  
Gain error  
15 to 35 °C...........................0.01% typ, 0.02% max  
–40 to 70 °C.........................0.07% typ, 0.1% max  
Resolution  
400 range..........................0.0061 Ω  
4,000 range.......................0.061 Ω  
Excitation current..............................135 ms pulses of 0.25 mA  
every 1,080 ms  
Input noise ........................................ 1 bit peak-to-peak  
Input bandwidth................................3 Hz  
Update rate........................................Each channel is updated  
every 1.08 s  
Physical Characteristics  
Indicators ..........................................Green POWER and  
READY indicators  
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  
channels  
Transient overvoltage........................2,300 Vrms  
Environmental  
FieldPoint modules are intended for indoor use only. For outdoor  
use, FieldPoint modules must be mounted inside a sealed  
enclosure.  
Operating temperature ......................40 to 70 °C  
Storage temperature..........................55 to 85 °C  
Humidity...........................................10 to 90% RH,  
noncondensing  
FP-RTD-122 and cFP-RTD-122  
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ni.com  
 
Maximum altitude.............................2,000 m; at higher altitudes  
the isolation voltage ratings  
must be lowered  
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 grms  
Operating vibration, sinusoidal  
(IEC 60068-2-6)................................10–500 Hz, 5 g  
Operating shock  
(IEC 60068-2-27)..............................50 g, 3 ms half sine,  
18 shocks at 6 orientations;  
30 g, 11 ms half sine,  
18 shocks at 6 orientations  
Safety  
This product is designed to meet the requirements of the following  
standards of safety for electrical equipment for measurement,  
control, and laboratory use:  
IEC 61010-1, EN 61010-1  
UL 3121-1, UL 61010C-1  
CAN/CSA C22.2 No. 1010.1  
For UL, hazardous location, and other safety certifications, refer to  
the product label or to ni.com.  
Electromagnetic Compatibility  
CE, C-Tick, and FCC Part 15 (Class A) Compliant  
Emissions..........................................EN 55011 Class A at 10 m  
FCC Part 15A above 1 GHz  
Immunity...........................................EN 61326:1997 + A2:2001,  
Table 1  
Note For EMC compliance, operate this device with  
shielded cabling.  
© National Instruments Corp.  
13  
FP-RTD-122 and cFP-RTD-122  
 
CE Compliance  
This product meets the essential requirements of applicable  
European Directives, as amended for CE Marking, as follows:  
Low-Voltage Directive (safety).........73/23/EEC  
Electromagnetic Compatibility  
Directive (EMC) ...............................89/336/EEC  
Note Refer to the Declaration of Conformity (DoC) for  
this product for any additional regulatory compliance  
information. To obtain the DoC for this product, click  
Declarations of Conformity Information at  
ni.com/hardref.nsf/.  
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.  
107.19 mm  
(4.22 in.)  
109.5 mm  
(4.31 in.)  
91.44 mm  
(3.60 in.)  
Figure 7. FP-RTD-122 Mechanical Dimensions  
Where to Go for Support  
For more information about setting up the FieldPoint system, refer  
to these National Instruments documents:  
FieldPoint network module user manual  
Other FieldPoint I/O module operating instructions  
FieldPoint terminal base and connector block operating  
instructions  
FP-RTD-122 and cFP-RTD-122  
14  
ni.com  
 
 
Go to ni.com/support for the most current manuals, examples,  
and troubleshooting information.  
For telephone support in the United States, create your service  
request at ni.com/ask and follow the calling instructions or dial  
512 795 8248. For telephone support outside the United States,  
contact your local branch office:  
Australia 61 2 9672 8846, Austria 43 0 662 45 79 90 0,  
Belgium 32 0 2 757 00 20, Brazil 55 11 3262 3599,  
Canada (Calgary) 403 274 9391,  
Canada (Montreal) 514 288 5722,  
Canada (Ottawa) 613 233 5949, Canada (Québec) 514 694 8521,  
Canada (Toronto) 905 785 0085,  
Canada (Vancouver) 514 685 7530, China 86 21 6555 7838,  
Czech Republic 420 2 2423 5774, Denmark 45 45 76 26 00,  
Finland 385 0 9 725 725 11, France 33 0 1 48 14 24 24,  
Germany 49 0 89 741 31 30, Greece 30 2 10 42 96 427,  
Hong Kong 2645 3186, India 91 80 51190000,  
Israel 972 0 3 6393737, Italy 39 02 413091,  
Japan 81 3 5472 2970, Korea 82 02 3451 3400,  
Malaysia 603 9059 6711, Mexico 001 800 010 0793,  
Netherlands 31 0 348 433 466, New Zealand 64 09 914 0488,  
Norway 47 0 32 27 73 00, Poland 48 0 22 3390 150,  
Portugal 351 210 311 210, Russia 7 095 238 7139,  
Singapore 65 6 226 5886, Slovenia 386 3 425 4200, South  
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.  
15  
FP-RTD-122 and cFP-RTD-122  
 

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