Answer / carl_ellis

The timer forces the on-off pneumatic control to drive open
or closed based on the timer's output state.

The timer's output relay activates or deactivates a 3 way
solenoid valve that supplies air to the valve's actuator.

In one timer state, the solenoid valve passes supply air to
the actuator driving the valve to its 'not-failed' state.

In the other timer state, the solenoid stops the air supply
and dumps the existing actuator pressure to atmosphere, letting
the valve assume its 'failed' state, whether open or closed.

Carl Ellis
Measure First

How can we check Zero of DP type Level Transmitter onside?

7 Answers   Birla,

---

what is the meaing of calibration curve?

3 Answers   HCL, Honeywell,

---

What is DCS?

4 Answers   GAIL, Sabic, Trident, Yokogawa,

---

What's the difference between cold loop test and hot loop test?

5 Answers  

---

given a processor batch of 1000 resistors moving on the conveyor belting in a large factory. the resistors is value at 10k ohms each but when the resistors reach the quality control, some of the resistor has been rejected caused by failure in manufacturing.the high quality measurement is used to determine the failure. describe the instrumentation terminology in measurement of a system above with explaining the important in:- -reliability -sensitivity -repeatability -precision -range -resolution -linearity -hysteresis -error -accuracy (answer must related to the scenario above)

0 Answers  

---

I have one DP transmitter of range 0-500mmWC i have to calculate its range in M3/hr for flow measurement so whats the formula.

4 Answers   ABB, TICB,

---

centrifugal compressor interlock? Tell me the parameter at which compressor will trip

0 Answers   Cairn,

---

Explain any simple temperature control system.

3 Answers   HGJ, L&T,

---

Describe a time when you anticipated potential problems and developed preventive measures.

0 Answers   Hotel Management,

---

I have 475 hart communicator. this is not support any new type of instruments such as tranmitter,fieldvue DVC6200.DVC 200 since i got point out need to upgrade . my questions is how can upgrade new instruments software in my 475 hart communicator. can any answerplease>?

1 Answers  

---

HOW TO CHECK THERMOCOUPLE AND RTD & WHAT IS THE DIFFERENCE BETWEEN THERMOCOUPLE AND RTD

14 Answers  

---

how we can calibrate an Interface level transmitter online

2 Answers   L&T,

---