The 931N-C121 analog signal converter is a signal conditioner device that is manufactured by Allen-Bradley/Rockwell Automation. It has sensor error and signal error detection facilities, a power rail mounting option, and an easy onboard configuration process. Some of the most common possible functions of this device are the signal linearization, isolation, and signal amplification functions. This standard signal isolator is powered by a 24 Volts DC power supply and it is powered by the power bus DIN system. The common measurement instruments that interface with this analog signal converter are the pressure sensor, flow sensor, potentiometer, and the strain gauge. It is UL/CSA, IECEx, and FM certified to meet all of the relevant industrial requirements. The Allen-Bradley 931N-C121 analog signal converter has an input resistance rating of 70 Ohms, a cutoff frequency of 100 Hertz, and a maximum of 0.05% of measuring range accuracy. The main purpose of this device is to transmit the application process measurements between the control system and field devices accurately and efficiently.

The Allen-Bradley 931N-C121 analog signal converter reproduces the signals via transformer coupling. If the measured sensor readings do not have a straight-line relationship with the physical parameters and measurements, the device attempts to linearize them. This signal conditioning device provides 3-way galvanic isolation between the input, output, and power supply while replicating the exact input signal value to the output. It has a passive input that is protected against overvoltage and polarity errors. It is suitable for transmitting critical process measurements such as the temperature, flow level, voltage, and weight data in a production process that is exposed to ground loops and noise. The 931N-C121 analog signal converter can be used in a variety of applications such as water treatment, oils, and gas applications. It also offers a cost-effective way to isolate signals to the PLC or control system.