Answer / carl_ellis

A snap action switch requires very little mechanical
movement (a very short linear distance) in order to actuate
the electrical switch contacts. Internally, the movement
and mechanical advantage of a lever is used to activate,
make or break, switch contacts.

The sensor elements in pressure switches: diaphragms,
pistons, bellows, all have move relatively small distances
with changes in pressure. A snap action switch is used as
the electrical component in a pressure switch because it can
be actuated/tripped by the small movement of pressure switch
sensor.

Mechanical adjustments allow for an adjustable setpoint by
moving the snap action switch with respect to the sensor
element.

The name of the firm that invented snap action switches is
Microswitch, so snap switches are frequently called
microswitches, which is technically a brand name.

In contrast, ordinary switches, like a toggle switch or a
rotary switch, rely on the relatively large movement of an
operator handle/lever to actuate the electrical contacts.

Carl Ellis
Measure First

What is the PLC Level & type.

2 Answers   Bhushan Power Steel,

---

what is working principle of presure and temperature guage?

4 Answers  

---

A differential pressure transmitter is configured to measure the height of an open tank : height 10m and dia 5m. Suppose this same transmitter is shifted to another open tank : height 10m and dia 4m. What will be the %error in measurement? how?

3 Answers   McCoy Engineering,

---

describe flow nozzel principle?

0 Answers   SEWA,

---

we have LPG spherical Tank and we want to install DP Xmtr for level measurement.below are the physical measurements Total height of tank is 1850 mtr but 0% level is 1000mm above bottom and 100% level is 450 below upper side.What is the LRV and URV and please mention the formula .The SG of LPG is 0.53 and Wet Leg method will be used.

7 Answers  

---

what is the difference between servo valve & proportional valve

1 Answers  

---

Can I route 110 VDC and 24 VDC in a same Duct for our Interposing relay cabinet? IF yes or NO Please provide me IEEE Std. for the same. Please i required it on Urgent basis, i need to design IRP Cabinets and we have MCC 110VDC and Our Coil side is 24VDC, Please help as soon as possible.

0 Answers   Yokogawa,

---

what is the difference between plc and pc?

5 Answers   ADI, NFCL, Wipro,

---

How does a strain gauge measure pressure?

2 Answers  

---

what is the difference between magnetic flow meter and mass flowmeter

0 Answers  

---

which type inter lock use in petrochemical refinery,and oil & gas?

0 Answers  

---

How to derive IO Count (AI, AO, DI and DO ) from a Field instrument (FI) Bill of Quantities (BOQ) given by client.

1 Answers  

---