Answer / jayeshsangani1988@gmail.c

zenner barrier is safety barrier for hazards area for current limiter,voltage limiter.
and zone for hazard area classification for duration based.
zone 1- explosive mixture of gas,vapor,is present in continuous
zone 2- explosive mixture of gas,vapor,is like to occur in normal operation
zone 3- explosive mixture of gas,vapor,isn't like to occur,and if occur is vary short time.probability is vary less in year

Answer / ram singh yadav

A Zener barrier is an associated equipment that is installed in the safe area. It is designed to limit the amount of energy that could appear in an electrical circuit passes through the hazardous area despite the connection before the barrier.

A barrier consists of:

1. Resistors to limit the current

2. Zener diodes to limit the voltage

3. Fuses to protect the components

how to make a calibration for differential pressure

2 Answers  

---

what is the T/C & RTD mesuremaint?

3 Answers  

---

hydrogen purity meter calibrating and commissioning procedure can be explained?

1 Answers  

---

I am new in work for 1 of our project we have some instrument in BOM including Pressure, Temp. and so on, I also noticed some objects like pressure switch process HOOK UP; which I don't know what does "HOOK UP" mean here.

3 Answers  

---

An equipment is certified for EEX, IA, IIC, T6, what do you under stand by this.

3 Answers   ADMA OPCO,

---

HELLO FRIENDS PLZ EXPLAINE ME WHAT IS ORIFICE?AND HOW WE ARE USING IT IN INSTRUMENTATION

5 Answers   Wartsila,

---

what is function of DCS , and how is it work , explain with difination

1 Answers   Bapco Bahrain Petroleum Company,

---

what is function of PLC, and how is it work , explain with difination

1 Answers   Bapco Bahrain Petroleum Company,

---

Why we use 250 ohm resister in series hart communicator?

3 Answers   Thermax,

---

Name different parts of a pressure gauge. Explain the use of hair spring in the pressure gauge.

0 Answers  

---

What is the use of GMV in turbine?

0 Answers   Hamsco, Maruti Suzuki,

---

protection relay watchdog contact operation?

0 Answers   L&T,

---