Units of measurement:-
Measurement
|
Units
|
Symbol
|
voltage
|
Volt
|
V
|
Current
|
Ampere
|
A (I)
|
Resistance
|
Ohm
|
Ω
|
Power
|
Watt
|
W
|
Frequency
|
Hertz
|
Hz
|
Capacitance
|
Fard
|
F
|
Multimeter:-
Company :- 1) Fluke
2)
Mica
3)
Rishb
Multimeter is used to measure Ac voltage & Dc voltage,
Ac & Dc current, resistance mili & micro volts, cable continuity.
Diagram of Multimeter (Fluke)
Voltage and current measurement (Diagram)
NOTE: - 1.
Voltage is always measure in parallel.
2. Current is always measure in
series.
Temp transmitter (TT)
Pressure transmitter (PT)
Level transmitter (LT)
Flow or DPT transmitter :- (FT)
(DPT)
Two wire transmitter
1.
Transmitter supply voltage =
24VDC
2.
Transmitter output = 4 to 20 MA
DC
Circuit
Diagram
NOTE: - standard checking system of mili
ampere in instrument.
a.
Always take (-) series to check
b.
All transmitters’ works on two
wire system.
Transmitter supply voltage is 24vdc that is
applied to transmitter in parallel. Transmitter output is 4 to 20 ma that is
current output we know that current is always measured in series so in above
diagram (-) to (-) line is standard series line so using Multimeter in series
we can measure 4 to 20 mili ampere current output.
Indicator
1.
DCS
2.
PLC
3.
Controller
4.
Indicator
How to use indicators shown in diagram below
Diagram
