Why we use 250 ohm resister in series hart communicator?

3 Answers   Thermax,

---

why we use by pas on a positioner? When can a by pass be not used on a positioner ?

1 Answers  

---

Explain the usage of the PLC system?

3 Answers  

---

What is Alpha & Beta fctors related to Orifice Plate & its relation with flow?

0 Answers  

---

Can any one tell me what type of question asked for instrumentation and control interview panel??? pls mail ramashankar.goel@gmail.com

0 Answers  

---

we callculat main steam flow by D.P. but where is H.P. & L.P. IN Orfics?

3 Answers  

---

Pls.could any one Clarify the following with an example. 1.At What condition Close on Rise and Close on Fall Pressure Switch contacts are used. 2.If Pressure is abnormal as per set pressure,if connecting Terminal of pressure switch breaks,how the voltage extends to Relay base. 3.Are these contacts come under fail safe philasaphy.

1 Answers  

---

Can anybody explain about wellhead control system.

1 Answers  

---

how can i calibrate E & h make conductivity transmiter . unit : mocro siemens Range :0 to 100 micro siemens sensor : capacitive type

1 Answers  

---

Which type of diagphram use in costic line,DM water line,natural gas line,oil line?

0 Answers   Hindustan Zinc,

---

ABB DCS (AC 800 M)redundency take howmany milliseconds to switch from master controller to slave?should be less than DCS scanning time?

2 Answers   SCS,

---

Can anyone explain about ELectropneumatics principle?

1 Answers   Forbes Marshall, Step,

---