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The 3B47 is a single-channel isolated thermocouple signal-conditioning module which interfaces, amplifies, isolates, protects, linearizes and filters analog input voltages from a J, K, T, E, R, S or B-type thermocouple. The thermocouple input signal is internally linearized to provide an output voltage which is linear with temperature. High accuracy internal cold junction compensation and a predictable upscale open circuit indication provide a complete signal conditioning solution. To accurately measure low level signals in electrically noisy environments, ±1500 V peak of galvanic transformer-based isolation with a common mode rejection (CMR) of 160 dB @ 50/60 Hz and a normal mode rejection (NMR) of 60 dB @ 50/60 Hz are provided. This plug-in, mix-and-match, hot-swappable module is easily field calibrated via front-panel zero and span adjustments.
Inside the 3B47 Module
A chopper-stabilized low-drift input amplifier assures stable long-term stability. At the amplifier input, a zero-scale input voltage is subtracted from the input signal to set the zero-scale value. For user convenience, the zero and span optionally can be factory configured to meet custom needs (Model 3B37-CUSTOM). Zero suppression can exceed 100% of the input range. This enables suppression of a zero-scale input value many times larger than the total span for precise expanded-scale measurements of a selection portion of an input signal. The differential input circuit on the field side is fully floating, eliminating the need for any input grounding. Signal isolation by transformer coupling uses a proprietary modulation technique for linear, stable and reliable performance A demodulator on the computer side of the signal transformer recovers the original signal, which is then filtered and buffered to provide a low-noise, low-impedance output voltage.
Accurate and System-Ready
Internal cold-junction compensation largely corrects errors arising from parasitic thermocouples formed by thermocouple connection to the input screw terminals, providing an accuracy of ±0.5°C over the +5°C to + 45°C ambient temperature range. The module generates a predictable upscale signal to indicate an open thermocouple; for a downscale response, connect a 47 MΩ, 0.25 Watt resistor across screw terminals 2 and 4 on the 3B Series backplane.
Figure 1. 3B47 Functional Block Diagram
Figure 2. 3B47 Input Field Connection
0 to +10 V
3B47 Models Available
|Model||Input Type||Input Range||Output Range||Accuracy1|
|Order Now||3B47-J-01||Type J||0°C to +760°C (32°F to +1400°F)||0 V to +10 V||0.76°C|
|Order Now||3B47-J-02||Type J||-100°C to +300°C (-148°F to +572°F)||0 V to +10 V||0.4°C|
|Order Now||3B47-J-03||Type J||0°C to +500°C (+32°F to +932°F)||0 V to +10 V||0.36°C|
|Order Now||3B47-K-04||Type K||0°C to +1000°C (+32°F to +1832°F)||0 V to +10 V||1.0°C|
|Order Now||3B47-K-05||Type K||0°C to +500°C (+32°F to +932°F)||0 V to +10 V||0.38°C|
|Order Now||3B47-T-06||Type T||-100°C to +400°C (-148°F to +752°F)||0 V to +10 V||1.1°C|
|Order Now||3B47-T-07||Type T||0°C to +200°C (+32°F to +392°F)||0 V to +10 V||0.3°C|
|Order Now||3B47-E-08||Type E||0°C to +1000°C (+32°F to +1832°F)||0 V to +10 V||1.5°C|
|Order Now||3B47-R-09||Type R||+500°C to +1750°C (+932°F to +3182°F)||0 V to +10 V||1.6°C|
|Order Now||3B47-S-10||Type S||+500°C to +1750°C (+932°F to +3182°F)||0 V to +10 V||1.5°C|
|Order Now||3B47-B-11||Type B||+500°C to +1800°C (+932°F to +3272°F)||0 V to +10 V||3.3°C|
|3B47-Custom||Type J, K, T, E, R, S, or B||*||*||*|
1The CJC sensor accuracy (refer to specification table) should be added to the module accuracy when computing system accuracy.
* Custom Input/Output ranges are available. Refer to configuration guide.
(typical @ +25°C and ±15 V dc, and +24 V dc Power)
|Thermocouple Types||J, K, T, E, R, S, B|
|Standard Ranges||Refer to Model Table|
|Custom Ranges||±5 mV to ±500 mV|
|Voltage (RL > 2 KΩ)||0 V to +10 V|
|Initial @ +25°C||See Model Table|
|Stability vs. Temperature|
|Span||±25 ppm of Reading/°C|
|Zero and Span Adjustment Range3||±5% of Span|
|Cold Junction Compensation (CJC)4|
|Initial Accuracy @ +25°C||±0.5 °C|
|Accuracy vs. Temperature, +5°C to +45°C||±0.5°C (±0.0125°C/°C)|
|Input Bias Current||+15 nA|
|Input Resistance||15 MΩ|
|Input, 0.1 Hz to 10 Hz Bandwidth||0.2 µV rms|
|Output, 100 kHz Bandwidth||100 µV rms|
|Bandwidth, -3 dB||3 Hz|
|Output Rise Time, 10% to 90% Span||200 ms|
|Open Input Response||Upscale|
|Open Input Detection Time||10 seconds|
|Common-Mode Voltage (CMV)|
|Input-to-Output, Continuous||±1500 V peak, maximum|
|Common Mode Rejection (CMR)|
|1 kΩ Source Imbalance, 50/60 Hz||160 dB|
|Normal Mode Rejection, 50/60 Hz||60 dB|
|Continuous||220 V rms maximum|
|Voltage Output Protection||Continuous Short to Ground|
|Current Output Protection||130 V rms, continuous|
|Power Supply Voltages|
|Rated Operation||±(11.5 V dc to 16.5 V dc)|
|Current||+16 mA, -14 mA|
|Mechanical Dimensions||3.15" x 3.395" x 0.775"
(80.0 mm x 86.2 mm x 19.7 mm)
|Rated Performance||-25°C to +85°C|
|Storage||-55°C to +85°C|
|Relative Humidity||0 to 95% @ +60°C noncondensing|
|RFI Susceptibility||±0.5% Span error @ 400 MHz, 5 Watt, 3 ft|
1 Current output is not available with model 3B47.
2 Includes the combined effects of repeatability, hysteresis, and nonlinearity.
3 A wide range of zero suppression and span adjustment is available to enable field calibration.
4 When used with the CJC temperature sensor provided on the 3B Series backplane. Specifications subject to change without notice.