Thermocouple and RTD Modules for Compact FieldPoint
NI cFP-TC-120, NI cFP-TC-125, NI cFP-RTD-122, NI cFP-RTD-124
• 8 temperature inputs
• Thermocouple or millivolt
• 2-, 3-, or 4-wire RTD
• Built-in signal conditioning
between channels
• 250 V common-mode isolation
on cFP-TC-125
• 50 and 60 Hz noise rejection
• 16-bit resolution
• Input ranges configurable in software
for each channel
• 2,300 V
rms
bank isolation for transient
overvoltage protection
• Hot-swappable with autoconfiguration
• -40 to 70 °C operating range
Module
cFP-TC-120
cFP-TC-125
cFP-RTD-122
cFP-RTD-124
Input
Channels
8
8
8
8
Resolution
(bits)
16
16
16
16
Input Type
Thermocouple
Millivolt
Thermocouple
Millivolt
2-, 3-wire RTD
Resistance
2-, 4-wire RTD
Resistance
Input Ranges Software-
Configurable per Channel
J,K,R,S,T,N,E, and B ± 25 mV, ±50 mV
±100 mV, -20 to 80 mV
J,K,R,S,T,N,E, and B
-20 to 80 mV
Pt 100, Pt 1,000
0 to 400, 0 to 4000
Ω
Pt 100
0 to 400
Ω
50/60 Hz
Noise Filter
All-Channel
Update Period
1.13 s (0.88 Hz)
0.22 s (Filter Off)
0.99 s (Filter On)
1.08 s (0.93 Hz)
1.08 s (0.93 Hz)
Common-Mode
Between Channels
–
250 V
rms
–
–
Safety
Isolation
2,300 V
rms
bank isolation
2,300 V
rms
bank isolation
2,300 V
rms
bank isolation
2,300 V
rms
bank isolation
Overview
The NI cFP-TC-12x and cFP-RTD-12x are versatile temperature input
modules for Compact FieldPoint used to measure thermocouples,
millivolt-level voltages, thermistors, and 2-, 3-, and 4-wire RTDs. They are
used in applications such as temperature chamber control, device testing,
and process control. Thermocouples are low-cost, flexible temperature
devices. RTD sensors are used in applications for acquiring temperatures
with high accuracy. Two- and 3-wire RTDs work well for applications with
short signal wires and low noise levels; 4-wire RTDs are well-suited for
applications with long signal wires or high noise levels. All of these I/O
modules include overranging and onboard diagnostics to ensure trouble-
free installation and maintenance. The modules measure and linearize
signals on board to return scaled values to your control or monitoring
software. The cFP-TC-12x and cFP-RTD-12x modules have NIST-traceable
calibration certificates (available upon request) to ensure accurate and
reliable analog measurements.
Compact FieldPoint
Compact FieldPoint is designed for industrial control applications that
perform advanced embedded control, data logging, headless operation,
and Ethernet connectivity. Compact FieldPoint, a rugged, reliable NI platform,
is designed for industrial and mobile environments with high shock,
vibration, and temperature extremes.
Isolation
The cFP-TC-125 provides 250 V
rms
common-mode voltage protection
between channels, and all cFP-TC-12x and cFP-RTD-12x modules
feature optical bank isolation with 2,300 V
rms
of breakdown isolation.
In addition, the cFP-TC-12x and cFP-RTD-12x offer double insulation for
up to 250 V
rms
of operational isolation. You can safely use Compact
FieldPoint with the cFP-CB-1 or cFP-CB-3 connector block in applications
where hazardous voltages are present.
Thermocouple and RTD Modules for Compact FieldPoint
cFP-RTD-124
The cFP-RTD-124 includes eight inputs for 2- and 4-wire RTDs. The module
uses a stable current source for sensor excitation and an onboard
microcontroller that linearizes and scales the measurements to temperature
units. You can configure each channel of the modules to return data scaled
to temperature (°C, °F, or °K) or resistance. Four-wire RTDs used with the
cFP-RTD-124 are ideal for applications involving long signal wires or high
signal noise. The 4-wire configuration eliminates the voltage drop caused
by lead wire resistance and reduces errors caused by noise.
Smart I/O Modules
The cFP-TC-12x and cFP-RTD-12x modules offer 16-bit resolution for
high-accuracy measurements, and you can connect directly to industrial
sensors or units under test with the safety isolation available. The
modules filter, calibrate, and scale raw sensor signals to engineering
units, as well as perform self-diagnostics to look for problems such as
open thermocouples. With cFP-TC-12x and cFP-RTD-12x modules, your
software application reads a linearized, calibrated, scaled value from the
I/O module, eliminating the error-prone step of converting binary values
to temperature. For increased accuracy and noise rejection, the modules
use a16-bit delta-sigma analog-to-digital converter (ADC) with an
integrated notch filter on each channel, which is configured for 50 and
60 Hz rejection. With high-accuracy 16-bit delta-sigma ADCs on the I/O
modules, you also get instrument-quality measurements on an industrially
rugged, distributed, embedded system. The cFP-TC-12x and cFP-RTD-12x
modules offer a variety of update rates to fit your application, ranging
from 0.22 s with filters off and 1.08 to 1.13 s with filters enabled. Overall
data throughput depends on filter settings across all channels, software
loop speeds, and network speeds.
Isothermal Connectivity for cFP-TC-12x Modules
For maximum accuracy, NI recommends using an isothermal connector
block with a cFP-TC-12x. The cFP-CB-3 isothermal connector block
minimizes the temperature gradient across wiring connections,
improving the accuracy of the cold-junction measurement, and,
therefore, of thermocouple measurements.
Compact FieldPoint I/O Connections
Compact FieldPoint modules include a built-in power distribution bus
that provides multiple power connections on the module. A field-wired
power supply connected to the voltage (V) and common (C) terminals is
internally connected to a power distribution bus that features additional
breakout terminals for voltage supply (VSUP) and common (COM). These
terminals offer a convenient way to distribute power to field devices that
require external power.
Each cFP-TC-12x input channel has two terminals for differential input:
1. Thermocouple positive input (IN+)
2. Thermocouple negative input (IN-)
Each cFP-RTD-122 input channel has three terminals:
1. Excitation output (EXCITE)
2. Sensing input (SENSE)
3. Common input (COM)
Each cFP-RTD-124 input channel has four terminals:
1. Excitation output (EXCITE)
2. Positive sensing input (SENSE+)
3. Negative sensing input (SENSE-)
4. Common input (COM)
cFP-TC-120
The cFP-TC-120 includes eight differential inputs for thermocouples.
It also provides cold-junction compensation using a thermistor embedded
in the connector block. An onboard microcontroller compensates and
linearizes the thermocouple reading to the NIST ITS-90 standard,
using an advanced linearization routine for maximum accuracy.
cFP-TC-125
In addition to the thermistor and linearization features of the cFP-TC-120,
the cFP-TC-125 provides 250 V
rms
of common-mode rejection, ideal for
applications where differences in voltages might exist between connected
thermocouples. The cFP-TC-125 also offers 0.22 s update rates when the
50/60 Hz filter is not enabled.
cFP-RTD-122
The cFP-RTD-122 includes eight inputs for 2- and 3-wire RTDs.
The module uses a stable current source for sensor excitation and an
onboard microcontroller that linearizes and scales the measurements to
temperature units. You can configure each channel of the module to
return data scaled to temperature (°C, °F, or °K) or resistance. The 3-wire
configuration used with the cFP-RTD-122 eliminates errors caused by
lead wire resistance but does not reduce errors caused by noise. If your
application involves high noise or long wires, you should use 4-wire RTDs
with the cFP-RTD-124.
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2
Thermocouple and RTD Modules for Compact FieldPoint
EX+ (Ch 0)
2-Wire
RTD
SENSE (Ch 0)
COM (Ch 0)
Short
Jumper
Wire
EX+ (Ch 1)
3-Wire
RTD
SENSE (Ch 1)
COM (Ch 1)
Short
Jumper
Wire
EXCITE+ (Ch 0)
SENSE+ (Ch 0)
2-Wire
RTD
SENSE– (Ch 0)
COM (Ch 0)
Short
Jumper
Wires
EXCITE+ (Ch 1)
SENSE+ (Ch 1)
3-Wire
RTD
SENSE– (Ch 1)
COM (Ch 1)
Leave this wire
unconnected
EXCITE+ (Ch 7)
EX+ (Ch 7)
4-Wire
RTD
SENSE (Ch 7)
COM (Ch 7)
[c]FP-RTD-122
COM (Ch 7)
[c]FP-RTD-124
SENSE+ (Ch 7)
4-Wire
RTD
SENSE– (Ch 7)
Figure 1. Wiring Diagram for cFP-RTD-12x
V C
Thermocouple
IN(+)
IN(–)
Shield
To Next
Channel
cFP-TC-120
Figure 2. Wiring Diagram for cFP-TC-120
Thermocouple
IN(+)
Ordering Information
IN(–)
Shield
Figure 3. Wiring Diagram for cFP-TC-125
Note: Connections depend on the application.
cFP-TC-125
NI cFP-TC-120 ......................................................................777318-120
NI cFP-TC-125 ......................................................................777318-125
NI cFP-RTD-122 ..................................................................777318-122
NI cFP-RTD-124 ..................................................................777318-124
Recommended System Products
NI cFP-2120 ......................................................................777317-2120
NI cFP-1804 ..........................................................................779490-01
NI cFP-BP-4 ............................................................................778617-04
NI cFP-CB-1............................................................................778618-01
NI cFP-CB-3............................................................................778618-03
NI PS-5 Power Supply ..........................................................778805-90
BUY NOW!
For complete product specifications, pricing, and accessory information,
call 800 813 3693 (U.S.) or go to
ni.com/advisors.
BUY ONLINE
at
ni.com
or
CALL 800 813 3693 (U.S.)
3
Thermocouple and RTD Modules for Compact FieldPoint
Specifications
Typical for -40 to 70 °C unless otherwise noted.
Input Characteristics
Number of inputs ................................
ADC resolution....................................
Type of ADC ........................................
Filters...................................................
Excitation current
cFP-RTD-122 ...................................
cFP-RTD-124 ...................................
Data scaling options
cFP-TC-120......................................
cFP-RTD-12x....................................
8
16 bits, 1 in 65,536
Delta-sigma
50/60 Hz rejection
0.25 mA
2 mA
Temperature (°C, °F, °K) or mV
Temperature (°C, °F, °K)
or resistance (Ω)
Weight
cFP-TC-120...................................... 130 g (4.6 oz)
cFP-TC-125...................................... 125 g (4.4 oz)
cFP-RTD-12x.................................... 110 g (3.7 oz)
Power Requirement
Power from network module
cFP-TC-120...................................... 350 mW
cFP-TC-125...................................... 650 mW
Environmental
Operating temperature ....................... -40 to 70 °C
Storage temperature........................... -55 to 85 °C
(cFP-TC-125 -40 to 80 °C)
Relative humidity ................................ 10 to 90%, noncondensing
Maximum altitude............................... 2,000 m; at higher altitudes
the isolation voltage ratings
must be lowered
Pollution degree.................................. 2
Update period, all channels
cFP-TC-125
Filter off ...................................... 0.22 s
Filter on ...................................... 0.99 s
cFP-TC-120...................................... 1.13 s
cFP-RTD-12x.................................... 1.08 s
Signal input bandwidth
cFP-TC-120...................................... 3 Hz
cFP-TC-125...................................... 12 Hz
Cold-junction accuracy cFP-TC-12x
With cFP-CB-3 connector block...... 0.25 °C typ, 0.5 °C max
Input impedance (cFP-TC-12x) ............ 20 MΩ
Input current (cFP-TC-12x)................... 35 nA typ, 140 nA max
Input noise .......................................... ±1 LSB
pp
Overvoltage protection
cFP-TC-120...................................... ±40 V
cFP-TC-125...................................... ±250 V
Common-mode voltage between channels referenced
to isolated ground
cFP-TC-125...................................... 250 V
cFP-TC-120...................................... 1 V
cFP-RTD-12x.................................... 2 V
Shock and Vibration
Operating vibration, random
(IEC 60068-2-64) ............................. 10 to 500 Hz, 5 g
rms
Operating vibration, sinusoidal
(IEC 60068-2-6) ............................... 10 to 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 and Compliance
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 61010-1, CSA 61010-1
Note:
For UL and other safety certifications, refer to the product label or
visit
ni.com/certification,
search by model number or product line, and
click the appropriate link in the Certification column.
Safety Isolation Voltage
Maximum safety isolation voltage ..... 250 V
rms
, Installation Category II
(cFP-TC-12x only)
Channel-to-channel safety isolation... No isolation between channels
Transient overvoltage.......................... 2,300 V
rms
Electromagnetic Compatibility
This product meets the requirements of the following EMC standards for
electrical equipment for measurement, control, and laboratory use:
• EN 61326 (IEC 61326): Class A emissions; Industrial immunity
• EN 55011 (CISPR 11): Group 1, Class A emissions
• AS/NZS CISPR 11: Group 1, Class A emissions
• FCC 47 CFR Part 15B: Class A emissions
• ICES-001: Class A emissions
Physical Characteristics
LED indicators
POWER (green) ............................... Power on and self-test passed
READY (green) ................................ Module configured and ready
OPEN TC <0..7> (red)
(cFP-TC-12x)................................ Open or broken thermocouple
on channel
Dimensions.......................................... 128 by 88 by 25 mm
(5.0 by 3.5 by 1.0 in.)
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or
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4
Thermocouple and RTD Modules for Compact FieldPoint
CE Compliance
This product meets the essential requirements of applicable European
Directives, as amended for CE marking, as follows:
• 2006/95/EC; Low-Voltage Directive (safety)
• 2004/108/EC; Electromagnetic Compatibility Directive (EMC)
Note:
Refer to the Declaration of Conformity (DoC) for this product for
any additional regulatory compliance information. To obtain the DoC for
this product, visit
ni.com/certification,
search by model number or
product line, and click the appropriate link in the Certification column.
Waste Electrical and Electronic Equipment (WEEE)
EU Customers:
At the end of their life cycle, all products must be
sent to a WEEE recycling center. For more information about WEEE
recycling centers and National Instruments WEEE initiatives,
visit
ni.com/environment/weee.htm.
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or
CALL (800) 813 3693 (U.S.)
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