7B27

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 +10V, 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 VDC supply.

The three input pins of Model 7B27 are protected up to +30 VDC. 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 frontend 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) signal is available at the output to drive loads down to 2 k.

The 7B Series of signal conditioners feature small size, low cost and a wide output voltage range for a variety of applications
including process control and factory-floor environments. The single-channel 7B modules accept inputs from a range of
transducers and are fully rated over the extended -40oC to +85oC industrial temperature range.It has many unique features:The first one is interfaces, amplifies and filters J, K, T, E, R, S, B, N, and B-type Thermocouple.The second one is it generates an isolated and protected precision output of either 0 to +5V or 0 V to +10 V.The third one is it operates with a nominal +24 VDC supply..The last one is all 7B27 series modules are mix-and-match and Hot Swappable.Beside, it also has three applications:The first one is industrial signal conditioning. The second one is industrial signal isolation. The third one is industrial signal filtering.

There are some specifications about 7B21(typical @ +23°C±5°C and Vs = +24 V dc).Input:Output Range (RL > 2 k) is +1 V to +5 V or 0 to +10 V.Accuracy:Initial @ +25°C is ±0.01% Span (±0.1% Span, maximum).Nonlinearity is ±0.02% Span, maximum.Input Offset vs. Temperature is ±0.5V/°C.Zero Suppression vs. Temperature is ±0.005% (Vz)3/°C.Span vs. Temperature is ±35 ppm/°C.Output Offset vs. Temperature is ±0.002% Span/°C.Cold Junction Compensation:Input Bias Current is -25 nA.

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