Answer / amith

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 because 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.

what is the si unit of pressure?

6 Answers   HTA Instrumentation,

---

What is hp & mp seperator .& what is its working principle ?

0 Answers  

---

how to calibrate transmitter online (in running plant)please explain correct procedure

4 Answers   Sabic,

---

Why grounding is necessary? Give example with diagram.

0 Answers   Bright Point, DS Group,

---

hello this is dhinakar i am completed my instrumentation engg . recently i got job in sugar industry side. i like to ask one question can any one say what are the things i have to follow know more about industrial instrumentation,,,,,,,

6 Answers  

---

can we use flow transmitter instead of level transmitter?

7 Answers  

---

wht is snap action switch?where it is used?is there any diff between snap action switch and normal pressure switch?

1 Answers   ONGC,

---

if a dp transmitter has range 100 in H2O and flow is 20mmcf and if the flow is changed to 25 mmcf then what is the formula to determine new range of transmitter

1 Answers   TATA,

---

in DCS or PLC we can not put all ai or di,there is calculation through which we can accomodate certain no of digital and analog signal.I need to know that calculation

1 Answers  

---

WHICH IS BEST INSTRUMENTATION OR ELECTRICAL ENGG?

3 Answers   SAS,

---

How to work togather like sov,limit switch,proxy switch and booster in xv

0 Answers  

---

What care will you take in the installation of control valves,SCADA,DCS and FOC in Oil and Gas Project?

0 Answers   KNPC,

---