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2. Pressure measurement - Wikipedia

   en.wikipedia.org/wiki/Pressure_measurement

   Differential pressure is the difference in pressure between two points. Differential pressure sensors are used to measure many properties, such as pressure drops across oil filters or air filters, fluid levels (by comparing the pressure above and below the liquid) or flow rates (by measuring the change in pressure across a restriction ...

3. Setra Systems - Wikipedia

   en.wikipedia.org/wiki/Setra_Systems

   Founded in 1967, Setra Systems, Inc. is a USA-based designer and manufacturer of pressure, humidity and current sensing products for the HVAC industry. In 2001, Setra was acquired by Danaher Corporation. Setra Technology Park is located in Boxborough, MA.[2]

4. District heating substation - Wikipedia

   en.wikipedia.org/wiki/District_heating_substation

   Differential pressure controller - to balance the network and improve working conditions of control valve; Temperature controller - to control temperature on secondary side by regulating the flow on primary side; Temperature sensor - to sense flow and return temperatures required for temperature control

5. HVAC control system - Wikipedia

   en.wikipedia.org/wiki/HVAC_control_system

   HVAC (Heating, Ventilation and Air Conditioning) equipment needs a control system to regulate the operation of a heating and/or air conditioning system. [1] Usually a sensing device is used to compare the actual state (e.g. temperature) with a target state. Then the control system draws a conclusion what action has to be taken (e.g. start the ...

6. Hydronic balancing - Wikipedia

   en.wikipedia.org/wiki/Hydronic_balancing

   Hydronic balancing, also called hydraulic balancing, is the process of optimizing the distribution of water in a building's hydronic heating or cooling system by equalizing the system pressure. In a balanced system every radiator is set to receive the proper amount of fluid in order to provide the intended indoor climate at optimum energy ...

7. Proportional–integral–derivative controller - Wikipedia

   en.wikipedia.org/wiki/Proportional–integral...

   With the invention of the low-pressure stationary steam engine there was a need for automatic speed control, and James Watt's self-designed "conical pendulum" governor, a set of revolving steel balls attached to a vertical spindle by link arms, came to be an industry standard. This was based on the millstone-gap control concept.