Page 981 - techequipmentscatalogue2016
P. 981
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Temperature switch and
controller testing in the field
Temperature switches and controllers are
commonly used in small processes and in control
loops where a programmable logic controller
(PLC) or larger distributed control system (DCS)
are not warranted.
Temperature controllers provide both switching
capability based on rising and dropping
temperatures, as well as a local indication of the
measured temperature.
Most temperature controllers have some form of
tuning, using damping and PID (Proportional.
Integral and Derivative values) for smoothing out
the measured process temperature,
reducing variability.
50 C - Closed The terminology around switches can be
- - Setpoint confusing. The set state of the switch is the
action the switch takes when an input stimulus
-----------------Deadband f--- - - Reset above or below a specified value is applied. This
stimulus can prompt an action such as closing
Open a switch, which in turn starts or stops a motor,
or opens and closes a valve. The reset point
1 High Limit is considered the relaxed state of the switch,
which is typically referred to as "Normally Open"
Process or "Normally Closed." This describes the default
Variable condition of the switch. Lastly, deadband is the
band of temperature equal to the difference
___ _____"j '":~J 1-Op-e-n --Reset between the temperatures where a switch sets,
t20C and resets. See illustration at left.
Closed
Low Limit
Suggested test tools
71 2B RTD 714B 7526A .....'.-~. 754
Temperature Thermocouple Precision Process Documenting
Calibrator Temperature Calibrator 726 Precision Process
Calibrator Multifunction Calibrator
Process
Calibrator 975
www.tech-equipments.comlsales@tech-equipments.com
Temperature switch and
controller testing in the field
Temperature switches and controllers are
commonly used in small processes and in control
loops where a programmable logic controller
(PLC) or larger distributed control system (DCS)
are not warranted.
Temperature controllers provide both switching
capability based on rising and dropping
temperatures, as well as a local indication of the
measured temperature.
Most temperature controllers have some form of
tuning, using damping and PID (Proportional.
Integral and Derivative values) for smoothing out
the measured process temperature,
reducing variability.
50 C - Closed The terminology around switches can be
- - Setpoint confusing. The set state of the switch is the
action the switch takes when an input stimulus
-----------------Deadband f--- - - Reset above or below a specified value is applied. This
stimulus can prompt an action such as closing
Open a switch, which in turn starts or stops a motor,
or opens and closes a valve. The reset point
1 High Limit is considered the relaxed state of the switch,
which is typically referred to as "Normally Open"
Process or "Normally Closed." This describes the default
Variable condition of the switch. Lastly, deadband is the
band of temperature equal to the difference
___ _____"j '":~J 1-Op-e-n --Reset between the temperatures where a switch sets,
t20C and resets. See illustration at left.
Closed
Low Limit
Suggested test tools
71 2B RTD 714B 7526A .....'.-~. 754
Temperature Thermocouple Precision Process Documenting
Calibrator Temperature Calibrator 726 Precision Process
Calibrator Multifunction Calibrator
Process
Calibrator 975
www.tech-equipments.comlsales@tech-equipments.com
