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The 3B37 is a single-channel signal conditioning module that interfaces, amplifies and filters input voltages from a J, K, T, E, R, S or B-type thermocouple and provides isolated simultaneous voltage and current outputs linear with input voltage. 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. The current output withstands 130 V rms without damage and interfaces user equipment through screw terminals located on the 3B Series backplane. This plug-in, mix-and-match, hot-swappable module is easily field calibrated via front-panel zero and span adjustments for both voltage and current outputs.
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.
3B Series Custom-Ranging Program
Externally-programmable version Model 3B37-X--00, enable the user to configure a special input range by using the optional plug-on AC1310 ranging card, which houses user-supplied resistors to determine zero and span. To facilitate selecting resistors, a Windows® program, 3B-CUSTOM, calculates resistor values based on the user-desired input/output ranges.
Inside the 3B37 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) or can be externally programmed (Model 3B37-X-00) via user-supplied resistors inserted in the optional AC1310 plug-on ranging card. 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; this output also drives a voltage-to-current (V/I) converter to provide a simultaneous current output for interfacing versatility.
Figure 1. 3B37 Functional Block Diagram
Figure 2. 3B37 Input Field Connections
0 to +10 V or -10 V to +10 V
0 to 20 mA or 4 to 20 mA
3B37 Models Available
|Model||Input Type||Input Range||Output Ranges1|
|Order Now||3B37-X-00||Type J, K, T, E, R, S, or B||Externally Programmable 2||0 V to +10 V & 0 mA to 20 mA|
|Order Now||3B37-J-01||Type J||-100°C to +100°C (-148°F to +1400°F)||0 V to +10 V & 0 mA to 20 mA|
|Order Now||3B37-K-02||Type K||-100°C to +1350°C (-148°F to +2462°F)||0 V to +10 V & 0 mA to 20 mA|
|Order Now||3B37-T-03||Type T||-100°C to +400°C (-148°F to +752°F)||0 V to +10 V & 0 mA to 20 mA|
|Order Now||3B37-E-04||Type E||0°C to +900°C (+32°F to +1652°F)||0 V to +10 V & 0 mA to 20 mA|
|Order Now||3B37-R-05||Type R||0°C to +1750°C (+32°F to +3182°F)||0 V to +10 V & 0 mA to 20 mA|
|Order Now||3B37-S-05||Type S||0°C to +1750°C (+32°F to +3182°F)||0 V to +10 V & 0 mA to 20 mA|
|Order Now||3B37-B-06||Type B||0°C to +1800°C (+32°F to +3272°F)||0 V to +10 V & 0 mA to 20 mA|
|3B37-Custom||Type J, K, T, E, R, S, or B||*||*|
1 Output current range may be user programmed to 4 mA to 20 mA using jumper supplied.
2 Requires AC1310 ranging card.
* Custom Input/Output ranges are available. Refer to configuration guide.
(typical @ +25°C and ±15 V dc, and +24 V dc Power)
|Standard Ranges||Refer to Model Table|
|Custom Ranges||±5 mV to ±500 mV|
|Voltage (RL > 2 K )||0 V to +10 V; -10 V to +10 V|
|Current (RL = 0 to 850Ω)1||4 mA to 20 mA or 0 mA to 20 mA|
|Maximum Current Output Span||0 mA to 31 mA|
|Initial @ +25°C||±0.1% Span + CJC Sensor Error|
|Stability vs. Temperature|
|Span||±25 ppm of Reading/°C|
|Zero||±25 ppm of Span/°C|
|Span||±25 ppm of Reading/°C|
|Zero and Span Adjustment Range4||±5% of Span|
|Cold Junction Compensation (CJC)5|
|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||50 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 6|
|±15 V dc Supplies|
|Rated Operation||±(11.5 V dc to 16.5 V dc)|
|+24 V dc Loop Supply|
|Rated Operation||+12 V dc to +30 V dc|
|Current||+27 mA @ lout = 20 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, 24 hours||0 to 95% @ +60°C noncondensing|
|RFI Susceptibility||±0.5% Span error @ 400 MHz, 5 Watt, 3 ft|
1 For a 0 mA to 20 mA range, a typical minimum output current is 10 µA.
2 Includes the combined effects of repeatability, hysteresis, and nonlinearity.
3 With respect to the voltage output.
4 A wide range of custom zero suppression and span is available with the 3B30-00 and 3B31-00 models, using the AC1310 ranging card.
5 When used with the CJC temperature sensor provided on the 3B Series backplane.
6 +24 V dc loop power is required for driving the current output at loads up to 850Ω. If a current output load of 400Ω or less is applied, +15 V dc is sufficient for loop power. If only voltage output is used, loop power is not required.
Specifications subject to change without notice.