THE RATIO OF THE CHANGE IN OUTPUT TO THE CHANGE IN INPUT THAT CAUSED IT

SEE "GPM"

DETECTS EXTREMELY SMALL ELECTRICAL CURRENTS

ELECTROMAGNETIC UNIT OF MAGNETIC INDUCTION

STANDS FOR "GALLONS PER HOUR"

STANDS FOR "GALLONS PER MINUTE", WHICH QUANTIFIES WATER FLOW

A MEASURE OF PRESSURE WHICH IS EXPRESSED IN FEET; TYPICALLY APPLIES TO CENTRIFUGAL PUMPS, AND INDICATES THE COLUMN HEIGHT OF WATER THAT IS BEING LIFTED BY THE PUMP

A UNIT THAT EITHER HEATS OR COOLS A BUILDING BY USING HEAT FROM THE CONDENSER SECTION OR BY USING COOLING FROM THE EVAPORATOR SECTION

USUALLY FOUND ON CIRCUIT BOARDS AND PRINTED WIRE BOARDS (PWB's), A HEAT SINK ACTS TO DISIPATE THE HEAT OF COMPONENTS THAT ARE MOUNTED ON THE SOLID STATE BOARDS.

THE METHOD OF CONTROL WHEN THE TEMPERATURE OF THE END PRODUCT IS MAINTAINED BY CONTROLLING TWO FINAL ELEMENTS USING TWO OUTPUTS

UNITS WHICH EXPRESS FREQUENCY; ABBREVIATION IS "HZ"

SEE "MEASURING JUNCTION"

MEASURES HUMIDITY IN % OF RELATIVE HUMIDITY WHILE SENSING AND CONTROLLING THE MOISTURE CONTENT OF THE AIR

WHEN A CONTROLLER CAUSES A MOTOR OR ACTUATOR DEVICE TO CONTINUOUSLY TRAVEL FROM ONE END OF ITS STROKE TO THE OTHER

THE OSCILLATION OR FLUCTUATION OF THE PROCESS TEMPERATURE BETWEEN SETPOINT & PROCESS VARIABLE

STANDS FOR "HEATING, VENTILATING, & AIR CONDITIONING"

STANDS FOR "HEATING, VENTILATING, AIR CONDITIONING, & REFRIGERATION"

AN ACTUATOR THAT EITHER OPERATES VALVES OR DAMPERS BY PRODUCING A LINEAR MOTION AS A RESULT OF THE FLUID PRESSURE DEVELOPED FROM A CONTINUOUSLY RUNNING MOTOR PUMPING OIL THROUGH A TRANSDUCER

THE CONTROL & USE OF WATER AS A HEAT TRANSFER MEDIUM IN AIR CONDITIONING SYSTEMS AND BOILERS

WATER ABSORBING

IN ON/OFF CONTROL, THE TEMPERATURE CHANGE THAT IS NECESSARY TO CHANGE THE OUTPUT FROM FULL ON TO FULL OFF

STANDS FOR INTEGRATED CIRCUIT

A CONTROL WITH AN  EXTENDED ELEMENT (BULB & CAPILLARY) THAT IS USED TO SENSE THE TEMPERATURE OF STEAM, WATER, ECT. IN LIQUID LINES AND TANKS. IMMERSION SENSORS/CONTROLS MOUNT REMOTELY AND ARE ALSO AVAILABLE IN STRAP-ON MOUNTING

OPPOSITION TO THE FLOW OF ELECTRICITY, RESISTIVE + REACTIVE

SEE "INCHES OF WATER COLUMN"

A TERM OF MEASUREMENT THAT IS PRIMARILY USED TO MEASURE & CONTROL LOW DIFFERENTIAL PRESSURES. LOW DIFFERENTIAL PRESSURES INCLUDE THOSE OF DUCT STATIC PRESSURE; SPACE STATIC PRESSURE; AND THE VELOCITY PRESSURE OF FLOWING AIR IN DUCTS.

AIR LEAKAGE THROUGH THE JOINTS & CRACKS,  AND WINDOWS & DOORS OF A BUILDING OR STRUCTURE DUE TO EITHER THE ADVERSE PRESSURE EFFECTS OF WIND, OR THE DIFFERENCE IN THE INDOOR & OUTDOOR AIR DENSITY

EXCEEDS RED LIGHT FROM 750 NANOMETERS TO 1,000 MICRONS AND IS USED TO DETECT TEMPERATURE & FLAME WITHOUT MAKING PHYSICAL CONTACT. MOSTLY USED IN THE DETECTION OF INFRARED IN FLAME IN BOILERS, BURNERS, OVENS, KILNS, & INCINERATORS.

RESTRICTS AIR FLOW INTO CENTRIFUGAL FAN HOUSINGS, AND RESTRICTS REFRIGERANT FLOW ON CENTRIFUGAL CHILLERS

PROCESS VARIABLE DATA BEING SUPPLIED TO THE DEVICE. FOR EXAMPLE: FOR A PROCESS TEMPERATURE CONTROLLER THE MOST COMMON FORMS OF INPUT ARE THERMOCOUPLE & R.T.D.

THE CONTROL ACTION THAT AUTOMATICALLY ELIMINATES OFFSET, OR "DROP", BETWEEN SETPOINT AND ACTUAL PROCESS TEMPERATURE, AND ALSO "RESET"

A CONTROL ACTION THAT IS SPECIFICALLY DESIGNED TO EITHER REDUCE OR EVEN ELIMINATE OFFSET IN A PROPORTIONAL CONTROL

ALSO REFERRED TO AS "I/A", IS A PROCESS CONTROL AUTOMATION SYSTEM DEVELOPED BY FOXBORO CO. (SIEBE) THAT PROVIDES COMPUTER-BASED MONITORING, CONTROLLING, & AUTOMATION TO AN INDUSTRIAL PLANTS PROCESS CONTROL LOOP(s)/SYSTEM

A MATHMATICAL PROCESS THAT ESTIMATES A MISSING FUNCTIONAL  VALUE BY TAKING A WEIGHTED AVERAGE OF KNOWN FUNCTIONAL VALUES AT NEIGHBORING POINTS. (THIS IS DONE ELECTRONICALLY IN SOME DEVICES).

A TIMER THAT HAS ITS OUTPUT OCCUR DURING THE TIMING STATE

STANDS FOR THE INSULATED POWER CABLE ENGINEERS ASSOCIATION

STANDS FOR INFRA-RED

STANDS FOR INSTRUMENT SOCIETY OF AMERICA

THE ELECTRICAL SEPARATION OF THE SENSOR FROM HIGH VOLTAGE CIRCUITRY. ALLOWS FOR APPLICATION OF GROUNDED OR UNGROUNDED SENSING ELEMENT

MEANS CONSTANT TEMPERATURE.

MEANS THE INTERNATIONAL TEMPERATURE SCALE OF 1990 WHICH IS THE PRESENT STANDARD DEFINED BY 17 FIXED POINTS WHICH ARE ASSIGNED STANDARD VALUES. ITS90 SUPERSEDES IPTS68.