HP & BP pressure sensor.
The pressure sensors are used to transmit pressure information measured in the circuit to the displays or regulators to which they are connected. They are available in different versions depending on the measured range, the connection (male or female), and their output signal: PA, “classic” transmitters* have a 4…20mA output while PR, ratio-metric transmitters, have a 0.5..4.5V output
Brand: ELIWELL