Answer / harsh zala

Fiber optic uses signals to be transmitted in form of light.
There are certain instruments which allows us to check the
signal level of fiber optic cable. The instrument name is
OTDR.
Through which we can check the fiber optic cable.

Answer / abdus sattar mollah

by instrument name OTDR: Optical Time Domain Reflexometer.
It injects laser beam into optical fiber through patch cord
and provides a graph between attenuation (dB) and Distance
(m).{performance decresess for shorter distance)
The graph's nature shows the cable performances.The graphs
has rising peaks followed by decaying lines.Spikes in the
decaying lines indicates severe loss.So,if we have smooth
decaying graph then it reflects good optical fiber
path.Whereas Spikes in curve indicates energy loss which
can be corrected by maintenence of Media Converter(OFC)
converter.Also the splice joings of fiber should not exceed
a maximum 0f 0.1 dB (calculated by Arc splicer Instruments).
Thats is how i have worked for communicating RTU panels
with SCADA server at Mangal PAndey Water Treatment
Plant,Barrackpore,West Bengal

Answer / jignesh

optical fiber cable is transmit the signal in form of
light,it will be measure such a instrument is OTDR .


RTU - stand for remote terminal unit . it collects all data
from the field , in field numbers of rtu is availble and
send a signal to one MTU. MTU is stand for Master Terminal
Unit which give signal to scada computer is Supervisory
Control Data Aqusition system.

Answer / praveen kumar

by instrument called OTDR

RTU remote Terminal Unit, for SCADA system used,all the
calbes are connected in RTU only.

Answer / sagar

Otdr is a simple instrument to use of identity the fault of OFC cable.

please explain smoke detectore & lel detector?what is o/p

1 Answers  

What is the difference between PLC and DCS?

3 Answers  

I need to know steps to Calibration Valve Guard......

0 Answers  

Good Evening all.My question is - For a feed water line to an equipment if i need to measure the flow we will use orifice /magnetic/vortex depend on cost/spec.If i need to measure a ''Alarm''signal and ''Interlock'' from one point i think we can use orifice type in one location with 2 different tapping points - one for alarm and one for an interlock to flow valve..If in case i need to have both these signals(Alarm & interlock) from magnetic flow meter,is it possible??will 2 seperate sensors will be located inbuilt r we can program it ??..i thk we can have one transmitter with these 2 signals...need to know any technical issues are there?pls clarify

3 Answers  

It is desired to reduce effect of 50Hz pick up in a thermocouple measurement. If a third order LP filter is used for this, what should be its cut off frequency, if gain should be 0.001 at 50Hz.

1 Answers   Honeywell,

You wish to SINK all my digital inputs to a PLC digital input card. Would you common out the leads to a positive or a negative connection?

1 Answers  

Explain working principle of lvdt?

0 Answers  

What is shriking and swell effect for a boiler ?

1 Answers  

a laways iface problem with brine level transmitter sealing diaphram a laways giving error and maximum reading i made re range and adjust with side glass but during commission it giving gap reading between it and side glass i need help from expert to explain how to calibrate it. note:dp transmitter yokogawa company

1 Answers  

How to rerange a dp type level transmitter after installation?

1 Answers   NSH,

how the transmitter send MA?

1 Answers  

What is Loop Test & What is Loop Checking? Please i need answer for these questions.

2 Answers