Answer / andy

electro-catalytic detectors detects change in resistance
whereas ir-type detectors detects changes in intensity of IR
spectrum and alerts the system whenever they detects a fire

Answer / gautam_etrx.engg

Ultraviolet rays (Earlier it was infrared rays)

Answer / faiyaz

Fire detector detect the fire like UV-ultra violet ray and IR means Infra ray both are fire one is small fire and one is big fire generally used in Hazard area like compressor and condensate area

Answer / saumyajit

in fire detectors normally we use photo resistors,which is used in wheatstone bridge circuit,in photo resistor conductivity changes as light intensity change.or we cud use photo diodes.(PN-diode,PIN-diode,avelanche diode)

Calibration procedure for electro magnetic flow meter

0 Answers  

---

what is the full form of psig.

8 Answers  

---

what is the difference between venturi and orifice meters?

9 Answers   Medha Servo Drives,

---

How to convert 0-2500mmH2o into kg/hr? Or how to convert mmH2O into kg/hr,t/hr etc

2 Answers  

---

what is difference between fork type and capacitance type level switch. where it is using

0 Answers  

---

what is difference between OP AMP and differential amplifier?

5 Answers   TCS,

---

In control valves (like feed water control valve) we will give 3 kg pressure and how it controls 110 kg of water pressure?

4 Answers   SSL,

---

where do you give the 4-20 ma i/p in a MIL control valve?

3 Answers   Siemens,

---

what is differences between singal acting and double action valve

1 Answers   Carlo Gavazzi, Welspun,

---

What is two wire system and how it work

2 Answers   Bhel, IFFCO,

---

without a positionar can a control valve operate? give the difference of operating with positionar and without positionar?

5 Answers   IOCL,

---

What is BMS (Building Managment System)& is AHU / HVAC are in BMS.

12 Answers   Alghanim,

---