7B37-K-22-1

Overview

The Analog Devices Inc. 7B37-K-22-1 is a single-channel signal conditioning module designed for Type K thermocouple inputs. It provides an isolated, amplified, and filtered output linear with temperature, specifically configured for the +1 V to +5 V range over a 0°C to +1200°C input span. The module features high accuracy internal cold junction compensation and galvanic transformer-based isolation rated at 1500 V rms continuous common mode voltage. Operating on a nominal +24 VDC supply within a +14 VDC to +35 VDC range, it delivers a low noise, low impedance output suitable for industrial process control and factory-floor environments.

Feature Summary

• Interfaces, amplifies, and filters Type K thermocouple signals with a 0°C to +1200°C input range.
• Provides a precision +1 V to +5 V output linearly proportional to temperature.
• Features 1500 V rms galvanic isolation with 160 dB common mode rejection at 50/60 Hz.
• Includes high accuracy internal cold junction compensation and upscale open circuit indication.

Applications

• Industrial signal conditioning
• Industrial signal isolation
• Industrial signal filtering

Procurement Notes

Verify the specific suffix configuration against the official datasheet model table to ensure the correct input type (Type K) and output range (+1 V to +5 V). Confirm that the required backplane hardware is compatible with the 7B Series universal pin-out. Check for any recent product change notifications regarding component updates or environmental compliance status.

Selection Notes

Select this model when a Type K thermocouple interface is required with a 0°C to +1200°C measurement range and a +1 V to +5 V output signal. Ensure the system utilizes a 7B Series backplane to provide the necessary cold junction compensation sensor. Verify that the power supply voltage falls within the +14 VDC to +35 VDC operating range and that the load resistance exceeds 2 kΩ to maintain specified accuracy.

Part Context

This component belongs to the 7B Series of signal conditioning modules from Analog Devices. The series is characterized by small size, mix-and-match capability, and hot-swappable functionality. Modules in this family are designed to plug into 19-inch rack-compatible backplanes, providing isolated analog signal processing for various transducer types including thermocouples, RTDs, and current loops.

Replacement Considerations

Other models within the 7B37 family offer different thermocouple types or temperature ranges. For example, the 7B37-K-21-1 covers 0°C to +600°C, while the 7B37-K-22-2 provides a 0 V to +10 V output for the same temperature range as the 7B37-K-22-1. Ensure the replacement matches the required input span and output voltage level.

FAQ

What is the bandwidth of the 7B37-K-22-1?

The module has a -3 dB bandwidth of 3 Hz, utilizing a two-pole low pass filter to precondition the signal.

How is cold junction compensation implemented?

Cold junction compensation is performed using a thermistor temperature sensor embedded under the input screw terminal block on the 7B Series backplane.

What is the maximum nonlinearity specification?

The maximum nonlinearity is ±0.02% of span, calculated using the best-fit straight line method.