Question { 4718 }

can any one pl explain me in brief that how we select the
leakage classification in valve,means for liquid or gas
there is any standard for selecting leakage classification
or its depend upon valve size or any any other parameter.

Answer

CLASS 2............ 0.5 % OF CV..........MEDIA AIR
CLASS 3............ 0.1 % OF CV..........MEDIA AIR
CLASS 4............ 0.01 % OF CV..........MEDIA AIR
CLASS 5............ 0.0005 ML/MIN.........MEDIA WATER
CLASS 6............ 1 BUBBLE/MINIT.......MEDIA WATER

IN CLASS 6 IT WILL CHANGE DEPENDING ON THE SIZE

Question { QAFCO, 7210 }

How to calibrate a temperature transmitter & how a Cold junction Compensation will be carried out?

Answer

IF U USE MV INJECTOR FOR THERMOCOUPLE CALIBRATION.........
FIRST U SHOULD MEASURE THE ROOM TEMPERATURE AND TO COMPUTE EQUELENT THERMOCOUPLE VOLTAGE.......V REF....
IF U R INJECTING 100 DEG EQULENT MV U SHOUD DEDECT V REF MV FROM THAT ACTUL MV...AND APPLY ADJUST 100.......

IF U R USING TEMPERATURE CALIBRATOR NO NEED THIS ONE ...U CAN APPLY DIRECT......BECAUSE IT GIVES THE COMBENSATED OUTPUT

Question { 4433 }

what5 does intrinsically safe mean.

Answer

IT IS DEFINED AS EQUIPMENT AND WIRING WHICH IS INCAPABLE OF RELEASING SUFFICIENT ELECTRICAL OR THERMAL ENERGY UNDER NORMAL OR ABNORMAL CONDITION.

Question { 10417 }

why do 4 mA serves as 0% not 0 mA?

Answer

to know actual zero or dead zero