Bridge Measurement - 4 to 20mA Current Transformer

The function of the circuit shown is to amplify the measurement signal of the sensor and convert it into a 4-20mA current output. The
measuring bridge is a bridge sensor, which can be a gas sensor or a pressure sensor; the excitation voltage of the sensor is the IO. OOV reference voltage source of
the AD 694 itself (output from the ⑦ pin), and the sensor output signal is sent to the AD524 for amplification and
output to the buffer amplifier inside the ② and ③ pins of AD 694. After buffer amplification, it is processed by the internal VI converter and other circuits , and finally outputs 4-20mA current
from the ⑩ pin .