Why 24VDC power Supply is used as standard for all loop
powered transmitters?
Answer Posted / lokendra
dear friends
as per ISA standards 24 VDC is the minimum possible voltage
at which the spark will not come,we know our transmitters
will give max output current of 27 mA here they have limit
this current bcause the power we get is less than 1 watt
(P=VxI)648mW which is not capable of producing a spark thus
they have avoided spark generation by selecting 24 VDC and
limiting currnt to 27mA.this comes under extrisic safety.
Is This Answer Correct ? | 47 Yes | 6 No |
Post New Answer View All Answers
CONTROL VALVE OPERATING IN MANUAL BUT NOT IN MANUAL. WHAT SHOULD BE THE PROBLEM ?
whats the abbreviation of IOP? is it instrument of power or input open problem?
What is instrumentation technologists and mechanics?
Capacitance, resistance ( colour coding ), parallel & series circuits.
What is three element drum level control system why its better than single element?
what is the difference between scaler and vector drive
How does a single acting, spring return ball valve actually work? Does it require continuous air supply?
what is difference between HOT permit and cold permit
In which principles tx ,pressure gauge,Temp gauge,control valve works?
Full form of KKS when use DCS.
please send data bank of quetions answers on analytical instrumentation.
2. What is ultrasonic flowmeter?
Specify ideal accuracy of flow element like orifice plate, Ventury, Annubar. Ultrasonic flow meter etc.
Hook up resistance decade box to temp.transmitter.
How to Calibrate Level Troll in field