SEE "CONTROLLED DEVICE"

ADJUSTING, VERIFYING, OR TUNING A DEVICE IN AN EFFORT TO REINSTATE THE DEVICES ACCURACY AND STABILITY

THE OUTPUT VOLTAGE OF A CONTROLLER WHEN THE SETPOINT AND CONTROL POINTS ARE EQUAL.

SEE "CSA"

YOUR NATIONAL SUPPLIER FOR ALL NAME BRANDS OF PROCESS INSTRUMENTATION, COMBUSTION FLAME-SAFEGUARD, AND HEATING, VENTILATING, & AIR CONDITIONING (HVAC) PARTS, CONTROLS, AND DEVICES-(800) 356-8000

WHEN THE OUTPUT OF ONE DEVICE IS THE SETPOINT FOR ANOTHER DEVICE

OCCURS IN FLOWING LIQUID WHEN THE PRESSURE FALLS BELOW THE VAPOR PRESSURE OF THE LIQUID CAUSING THE LIQUID TO VAPORIZE AND BUBBLE. THE BUBBLES ARE CARRIED THROUGH THE PUMP OR VALVE INLET TO A ZONE OF HIGHER PRESSURE WHERE THEY COLLAPSE WITH GREAT FORCE.

STANDS FOR COUNTER CLOCKWISE

STANDS FOR "CENTIGRADE" AND IS MEASURED BY 0 DEGREES AT THE ICIER POINT AND 100 DEGREES AT THE BOILING POINT OF WATER.

STANDS FOR "CUBIC FEET PER MINUTE", THE RATE OF AIR-VOLUME DELIVERY WHICH IS A STANDARD MEASURE FOR HVAC DUCTED SYSTEMS.

THE MAXIMUM AMOUNT OF PRESSURE DROP THAT A VALVE CAN BE SUBJECTED TO WHEN IT'S FULLY CLOSED.

A CONTROL SYSTEM THAT HAS A SENDING DEVICE FOR PROCESS VARIABLE FEEDBACK

STANDS FOR "COMMON MODE REJECTION".

STANDS FOR "COMMON MODE VOLTAGE"

THE PART OF THE DUCT THAT CONTAINS THE CHILLED WATER COIL OR THE DX COIL.

THE POINT OF CONNECTION BETWEEN THE THERMOCOUPLE'S METALS AND AN ELECTRONIC DEVICE/INSTRUMENT

AN ELECTRONIC MEANS USED TO COMPENSATE FOR THE EFFECT OF TEMPERATURE AT THE COLD JUNCTION

ALSO REFERRED TO AS THE "COMFORT ZONE", WHICH IS THE RANGE OF TEMPERATURES & HUMIDITIES WHICH MAKE THE MAJORITY OF PEOPLE FEEL COMFORTABLE. THIS IS USUALLY BETWEEN 67F AND 79F, AND 20% TO 60% RELATIVE HUMIDITY.

SEE "CONTROL MODE"

HEAT ENERGY WHICH IS TRANSMITTED BY DIRECT CONTACT.

WIRE THAT IS DESIGNED TO CARRY ELECTRICAL CURRENT BUT IS NOT INSULATED

CAN ALSO BE REFERRED TO AS SET-UP, WHICH IS THE SELECTION OF HARDWARE DEVICES AND SOFTWARE ROUTINES THAT FUNCTION TOGETHER

A SYSTEM THAT CHANGES THE SUPPLY AIR TEMPERATURE IN RESPONSE TO SPACE LOAD, WHILE MAINTAINING CONSTANT AIR FLOW.

THE ALLOY WHICH IS MADE-UP OF COPPER & NICKEL AND IS PRIMARILY USED IN TYPE J, E, & T THERMOCOUPLES

THE SLOPE OF THE OUTPUT OF AN INSTRUMENT OR DEVICE IN REFERENCE TO THE INPUT. FOR EXAMPLE: DIRECT OUTPUT INCREASES ON RISE OF INPUT. TYPICAL COOLING RESPONSE OR REVERSE OUTPUT DECREASES ON RISE OF INPUT(TYPICAL HEATING RESPONSE)

SEE "ADAPTIVE CONTROL"

PART OF THE CONTROLS ALGORITHM THAT REACTS TO THE RATE OF CHANGE OF THE PROCESS VARIABLE

PART OF THE CONTROLS ALGORITHM THAT REACTS TO OFFSET BETWEEN SETPOINT & PROCESS VARIABLE

PID IS THE CONTROL ACTION OF PROPORTIONAL + INTEGRAL + DERIVATIVE WHICH IS THE CONTROL ALGORITHM THAT PROVIDES PROPORTIONAL CONTROL WITH BOTH INTEGRAL & DERIVATIVE ACTIONS

WHEN THERE IS A CONTINUOUS LINEAR RELATION BETWEEN THE OUTPUT AND THE INPUT

A CONTROL ALGORITHM THAT PROVIDES PROPORTIONAL CONTROL WITH THE ADDITION OF DERIVATIVE ACTION IN ORDER TO COMPENSATE FOR OFFSETS BETWEEN SETPOINT & PROCESS VARIABLE

A CONTROL ALGORITHM THAT PROVIDES PROPORTIONAL CONTROL WITH THE ADDITION OF INTEGRAL ACTION IN ORDER TO COMPENSATE FOR OFFSETS BETWEEN SETPOINT & PROCESS VARIABLE

A MATHMATICAL REPRESENTATION OF THE CONTROL ACTION TO BE PERFORMED

THE CONTROL MODE, OUTPUT, OR ACTION USED BY A PROCESS TEMPERATURE CONTROLLER SUCH AS PID, ON/OFF, TIME-PROPORTIONING, ECT.

A METHOD OF OPERATION WHICH THE USER SELECTS, WHERE THE CONTROLLER DETERMINES THE CONTROL OUTPUT

A METHOD OF OPERATION WHICH THE USER SELECTS, WHERE THE OPERATOR DETERMINES THE CONTROLLER OUTPUT

THE END PRODUCT WHICH IS AT SOME DESIRED VALUE THAT IS THE RESULT OF HAVING BEEN PROCESSED OR MANIPULATED

THE VALUE OF THE CONTROLLED VARIABLE IN WHICH A CONTROLLER OPERATES TO MAINTAIN.

THE TEMPERATURE WHICH A SYSTEM IS MAINTAINED AT

SEE "CASCADE CONTROL"

THE CONTROL OF TEMPERATURE ABOUT A SETPOINT BY TURNING THE OUTPUT FUUL ON BELOW SETPOINT AND FULL OFF ABOVE SETPOINT IN THE HEAT MODE

A DEVICE/UNIT THAT RECEIVES A SIGNAL FROM A CONTROLLER AND POSITIONS THE DAMPER OR VALVE TO MATCH THE CAPACITY TO THE LOAD; EXAMPLE OF THIS IS A MOTORIZED VALVE OR MOTORIZES DAMPER.

A PROCESS VARIABLE THAT IS TO BE CONTROLLED AT SOME DESIRED VALUE BY MEANS OF MANIPULATING ANOTHER PROCESS VARIABLE

A CONTROL/DEVICE THAT MONITORS A CONTROLLED VARIABLE AND CHANGES THE POSITION OF SUCH FINAL CONTROL DEVICES AS VALVES, DAMPERS, ECT., AND, MAINTAINS THE VALUE OF THE CONTROLLED VARIABLE AT OR VERY CLOSE TO THE CONTROLLER'S SETPOINT.

HEAT THAT MOVES FROM ONE PLACE TO ANOTHER BY CURRENTS WHICH ARE SET-UP WITHIN EITHER A FLUID MEDIUM, LIQUID, OR VAPOR.

STANDS FOR "CYCLES PER SECOND", WHICH IN HERTZ (HZ) REPRESENTS THE NUMBER OF PERIODIC EVENTS IN ONE SECOND.

STANDS FOR "CYCLES PER SECOND", THE NUMBER OF EVENTS IN A ONE (1) SECOND PERIOD OF TIME, USUALLY EXPRESSED IN HERTZ.

CENTRAL PROCESSING UNIT. THE "BRAINS" OF THE COMPUTER WHICH DIRECTS, EXCECUTES, AND PERFORMS ALL COMMANDS AND PROCESSING FUNCTIONS.

STANDS FOR CONDENSATE RETURN

TEMPERATURES WHICH ARE EXTREMELY LOW, SUCH AS MINUS 180 DEGREES CELSIUS.

"CANADIAN STANDARDS ASSOCIATION."  THE NATIONAL STANDARDS OF CANADA WHICH ARE NORMALLY USED IN THE FIELDS OF SAFETY, BUILDING, CONSTRUCTION, HEALTH, AND THE ENVIRONMENT.

STANDS FOR "CANADIAN STANDARDS ASSOCIATION", SIMILAR TO THE U.S. EQUIVALANT  U.L. (UNDERWRITERS LABORATORIES)

STANDS FOR CURRENT TRANSFORMER

SEE "CFM."

THE FLOW RATE OF ELECTRICITY

NORMALLY ASSOCIATED WITH PROCESS TEMPERATURE CONTROLLERS, PROVIDES A CURRENT PROPORTIONAL TO THE AMOUNT OF CONTROL THAT IS REQUIRED

STANDS FOR "FLOW COEFFICIENT," WHICH IS THE FLOW OF WATER GALLONS PER MINUTE (GPM) AT A TEMPERATURE OF APPROX. 60F, THAT CAUSES A 1 PSI PRESSURE DROP ACROSS A FULLY-OPENED VALVE.

STANDS FOR CLOCKWISE

THE TIME THAT IS NECESSARY TO COMPLETE A FULL ON-THRU-OFF PERIOD IN A TIME PROPORTIONING CONTROL SYSTEM