Answer / sam

a Pressure switch is just a small diaphragm that moves as
the pressure increases. This diaphragm is pushing a small
pin upwards and the pin is pushing a micro switch to close.
Obviously if the pressure decreases again, the pin goes down
and the switch will open again. So based on this information
it is easy to see that you just need to supply pressure to
this diaphragm with a hand pump, put your multimeter on the
switch contact in order to see when the switch open or
closes and and make the adjustment on the switch until it
switches at the point where you need it to switch. The
adjustment is normally in the form of a spring.
Increasing or decreasing the tension on this spring will
change how high or low pressure is needed to move the diaphragm.
The only thing that you need to remember when working on
pressure switches, is that if you want to calibrate the
switch as a pressure switch low you need to pump the switch
up higher than your required switching point and then
decreases the pressure slowly until the switch changes
state. The same if you want to use it as a pressure switch
high, you then need to start with a low pressure and
increase your pressure slowly until the switch changes state.
Good luck

how can i communicate with non-national instruments device with pc via labVIEW8.2

3 Answers   Google, Mico, National Instruments,

---

how can calibrate vacume trasmitter by HART COMMUNICATOR ?

3 Answers   Bajaj, IMECO,

---

flow transmitter range is 0 -500 mmwcc but the transmitter shows 12 ma for o mmwc instead of 4 ma ...how to solve this problem when we apply 375 mmwc it shows 16 ma

3 Answers  

---

what is the procedure for auto tune in masoneialn 12300 series displacer type transmitter?

0 Answers  

---

how can calibrate transmitter online

2 Answers  

---

---

FOR CO/CO2/O2/NOX applications which of the following manufature is best? and what is the basic principle of gas analysers? ABB/YOKOGAWA/EMERSON/SIEMENS/TELEDYNE/THERMOFISHER

4 Answers  

---

What is the meaning of wet leg

0 Answers  

---

i want know about capillary type LT transmitter installation. we can install any location in between to HP and LP leg?

2 Answers  

---

What is mean by ATEX?

1 Answers  

---

What is cut off relay? And why use in PLC and DCS?

0 Answers  

---

please send data bank of quetions answers on analytical instrumentation.

0 Answers  

---

Profibus DP is a multi-master system. Would it work on RS-485 4W or not, and justify your answer

1 Answers   EIT,

---