List Four Methods of Measuring Temperature and Explain Which of Them Can Be Used for Automatic Contr

There are two ways to automatically adjust the indoor temperature.

1. Sub-loop control. At the primary water separator or sump, the automatic adjustment valve is set in the shunt to keep the room or area at the setting temperature value. The automatic regulator valve can also be built into the sump.

2. Overall control. An automatic regulating valve is provided on the main water supply pipe of the primary water separator to control the indoor temperature of the entire user or area.

Control Method

1. The thermoelectric temperature control valve is referred to as the thermoelectric valve. It relies on the thrust generated by the electric heating of the heating element in the driver to push the valve stem to close the flow channel. The signal comes from the indoor thermostat.

2. The self-operated thermostatic control valve is divided into a built-in temperature-packed self-operated thermostatic control valve and a remote-controlled self-operated temperature control valve. The built-in temperature-packing type self-operated thermostatic control valve should adopt a control sub-loop, which can raise the heating pipes of each loop from the ground to a certain height on the wall and install a thermostatic valve. There should be a venting device at the local high point where the thermostatic valve is installed.

3. Most of the manifolds use a plunger valve. The electric valve actuator is arranged on the plunger valve, and the temperature measuring device should be controlled by the loop.