7B27 ISOLATED, THERMOCOUPLE INPUT




Functional Description

7B27-k-02-1 The 7B27 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 an isolated (up to 100 V rms) and protected precision output of either +1 V to +5 V or 0 V to +10 V, linear with input voltage. High accuracy internal cold junction compensation and a predictable upscale open circuit indication provide a complete signal conditioning solution. The 7B27 is mix-and-match and hot-swappable with other 7B Series input modules, so can be inserted or removed from any socket in the same backplane without disturbing power. Model 7B27 is rated to operate with a nominal +24 V DC supply.

Inside the 7B27 Series Module

The three input pins of Model 7B27 are protected up to ±30 V DC. A one-pole 3 Hz filter preconditions the thermocouple signal prior to amplification, provided by a low drift input amplifier. Cold junction compensation (CJC) is implemented using a thermistor temperature sensor embedded under the input screw terminal block on a 7B Series backplane. A voltage reference source acts to offset the thermocouple signal in accordance with the specified lower bound on the input temperature range. A current source provides the upscale open circuit indication. Amplitude modulation is used to implement transformer isolation (100 V rms, continuous). Isolated front-end circuitry power is supplied by a DC/DC converter. The output section contains a demodulator, a two-pole low pass filter (-3 dB @ 3 Hz), a buffer amplifier and a power oscillator. The two-pole output filter and subsequent buffer ensures that a low noise, low impedance (<1 Ω) signal is available at the output to drive loads down to 2 kΩ.



Figure 1. 7B27 Functional Block Diagram

 

Input Types

Thermocouples J, K, T, E, R, S, B

Output Options

+1 V to +5 V

0 V to +10 V

 
7B27FCD

Figure 2. 7B27 Input Field Connections



7B27 Models Available

  Model Input Type Input Range Output Range
Order Now 7B27-J-01-1 Type J -100°C to +100°C (-148°F to +1400°F) +1 V to +5 V
Order Now 7B27-J-01-2 Type J -100°C to +100°C (-148°F to +1400°F) 0 V to +10 V
Order Now 7B27-J-10-1 Type J 0°C to +200°C (+32°F to +392°F) +1 V to +5 V
Order Now 7B27-J-10-2 Type J 0°C to +200°C (+32°F to +392°F) 0 V to +10 V
Order Now 7B27-J-11-1 Type J 0°C to +400°C (+32°F to +752°F) +1 V to +5 V
Order Now 7B27-J-11-2 Type J 0°C to +400°C (+32°F to +752°F) 0 V to +10 V
Order Now 7B27-J-12-1 Type J 0°C to +600°C (+32°F to +1112°F) +1 V to +5 V
Order Now 7B27-J-12-2 Type J 0°C to +600°C (+32°F to +1112°F) 0 V to +10 V
Order Now 7B27-J-13-1 Type J +300°C to +600°C (+572°F to +1112°F) +1 V to +5 V
Order Now 7B27-J-13-2 Type J +300°C to +600°C (+572°F to +1112°F) 0 V to +10 V
Order Now 7B27-K-02-1 Type K -100°C to +1350°C (-148°F to +2462°F) +1 V to +5 V
Order Now 7B27-K-02-2 Type K -100°C to +1350°C (-148°F to +2462°F) 0 V to +10 V
Order Now 7B27-K-20-1 Type K 0°C to +300°C (+32°F to +572°F) +1 V to +5 V
Order Now 7B27-K-20-2 Type K 0°C to +300°C (+32°F to +572°F) 0 V to +10 V
Order Now 7B27-K-21-1 Type K 0°C to +600°C (+32°F to +1112°F) +1 V to +5 V
Order Now 7B27-K-21-2 Type K 0°C to +600°C (+32°F to +1112°F) 0 V to +10 V
Order Now 7B27-K-22-1 Type K 0°C to +1200°C (+32°F to +2192°F) +1 V to +5 V
Order Now 7B27-K-22-2 Type K 0°C to +1200°C (+32°F to +2192°F) 0 V to +10 V
Order Now 7B27-K-23-1 Type K +600°C to +1200°C (-148°F to +1400°F) +1 V to +5 V
Order Now 7B27-K-23-2 Type K +600°C to +1200°C (-148°F to +1400°F) 0 V to +10 V
Order Now 7B27-T-03-1 Type T -100°C to +400°C (-148°F to +752°F) +1 V to +5 V
Order Now 7B27-T-03-2 Type T -100°C to +400°C (-148°F to +752°F) 0 V to +10 V
Order Now 7B27-E-04-1 Type E 0°C to +900°C (+32°F to +1652°F) +1 V to +5 V
Order Now 7B27-E-04-2 Type E 0°C to +900°C (+32°F to +1652°F) 0 V to +10 V
Order Now 7B27-R-05-1 Type R 0°C to +1750°C (+32°F to +3182°F) +1 V to +5 V
Order Now 7B27-R-05-2 Type R 0°C to +1750°C (+32°F to +3182°F) 0 V to +10 V
Order Now 7B27-S-06-1 Type S 0°C to +1750°C (+32°F to +3182°F) +1 V to +5 V
Order Now 7B27-S-06-2 Type S 0°C to +1750°C (+32°F to +3182°F) 0 V to +10 V
Order Now 7B27-B-07-1 Type B 0°C to +1800°C (+32°F to +3272°F) +1 V to +5 V
Order Now 7B27-B-07-2 Type B 0°C to +1800°C (+32°F to +3272°F) 0 V to +10 V


7B27 Specifications
(typical @ +23°C ±5°C and Vs = +24 V dc)
Description Model 7B27
Input Ranges
Thermocouple Types J, K, T, E, R, S, B
Standard Temperature Ranges Refer to Model Table
Custom Ranges Not Available*
Output Range Options (RL > 2 kΩ) +1 V to +5 V or 0 V to +10 V
Accuracy1
Initial @ +25°C ±0.01% Span (±0.1% Span, maximum)
Nonlinearity2 ±0.02% Span, maximum
Input Offset vs. Temperature ±0.5µV/°C
Zero Suppression vs. Temperature ±0.005% (Vz)3/°C
Span vs. Temperature ±35 ppm/°C
Output Offset vs. Temperature ±0.002% Span/°C
Cold Junction Compensation
Accuracy4 over +5°C to +45°C ambient ±1.0°C, maximum
Input Bias Current -25 nA
Input Resistance
Power ON 10 MΩ
Power OFF 30 kΩ, minimum
Output Noise
5 MHz Bandwidth 6 mV peak
10 Hz to 100 kHz Bandwidth 0.4 mV rms
0.1 Hz to 10 Hz Bandwidth 0.6 µV peak
Bandwidth, -3 dB 3 Hz
Output Rise Time, 10% to 90% Span 150 ms
Common-Mode Voltage (CMV)
Input-to-Output and Power 100 V rms continuous
Common Mode Rejection (CMR)
Input-to-Output and Power @ 50/60 Hz 160 dB
Normal Mode Rejection @ 50/60 Hz 60 dB
Input Protection ±30 V dc, continuous
Input Transient Protection ANSI/IEEE C376.90.1-1989IEEE-STD 472IEC 255-4, Class II
Output Resistance < 1 Ω
Voltage Output Protection Continuous Short to Ground
Power Supply
Voltage Range, Operating +14 V dc to +35 V dc
Current +25 mA, maximum
Sensitivity ±0.0001%/% of Vs
Mechanical Dimensions 1.663" x 2.11" x 0.563"(42.24 mm x 53.6 mm x 14.3 mm)
Environmental
Temperature Range
   Operating -40°C to +85°C
   Storage -40°C to +85°C
Relative Humidity, 24 hours 0 to 90% @ +60°C noncondensing
ESD Sensitivity IEC 801-2, Level 2
RFI Susceptibility ±0.5% Span error @ 400 MHz, 5 Watt, 3 ft

Warm-up time required to meet specifications is approximately 10 minutes.
* Contact factory for OEM requirements.
1Includes the combined effects of repeatability, hysteresis, and nonlinearity.
2Nonlinearity is calculated using best-fit straight line method.
3Vz is the nominal input voltage that results in a 0 V output.
4 When used with the CJC temperature sensor provided on each channel of 7B Series Backplanes.
Specifications subject to change without notice.

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