this is a loop control system where the controller observes process conditions and and manuplates a control valve manually

the main purpose of this device is to measure the pressure difference between two pressures

the mechanism central ro all pneumatic control systems

type of thermostat used in residential, commercial and institutional buildings

the distributed control system has both of these types inputs and outputs

this can position itself according to control output signal to adjust the manipulated variable

metallic diaphragm elements are suitable for pressures in this range

temperature indication is done using one of these connected with a capillary tube and a sensing bulb

NC or normally closed relays are also called this

transmitters of this variety are able to provide information in digital form

the pneumatic signal range and supply pressure for a pneumatic control system are at this kPa

in many situations equipment may be damaged by different processes and their respective pressure pulsations, the device used to prevent this is a line pulsation dampener or snubber. these are two varieties of snubber

produces infinitely variable control output signals based on the infinitely variable error between process variable and set point

these motors have maximum torque at standstill

these can read all input poiable to read all input points in sequence, this device is used to select the correct computer at the right time.

depending on the programmer, one or more discrete voltage signals from various sensors in the boiler safety circuit are required before the purge cycle begins, these switches are often called this

a solid state resistance temperature sensor that may have either a negative of positive temperature coefficient

this type of single ported valve is used when downward movement of the valve plug is needed to increase flow.

thermistors resistance changes with temperature in this way

this method of backing up information is preferable as very little data is changed or created on a daily basis compared to other methods

the name used in the instrumentation trade for voltage drop over a length of conductor

the thermal conductivity detector is commonly used in gas chromatagraphs to analyze hydrocarbon and this type of mixture

hydraulic fluid has this quality which makes it preferable in certain situations over pneumatic as it ensures the final control element does not vary in position due to forces exerted by manipulated variable.

stepper motors have multiple salient electromagnetic pieces arranged around this

the three basic logic conditions