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Douglas Krantz -- Fire Alarm Engineering Technician, Electronic Designer, Electronic Technician, Writer





C Wrote:

Dear Sir,

Good morning.

I am studying about the fire protection and detection system.

I got a question. It's as below.

QUESTION - Can we use the Flow Switches and Pressure Switches that are used with water lines, for fire suppression system, if fire suppression system uses NOVEC 1230 liquid?

Kindly please help me.

Thanking You & Best regards,
C

Douglas Krantz Wrote:

To understand what can and can't be used for fire alarm and fire suppression systems, we need to step back a little bit. Basically, you have to see if the flow or pressure switch has been Rated for Use.

The term "Rated for Use" shows that the device in question has been tested by a third party testing company (UL, ULC, CE, Etc.) to make sure that the device will perform as advertised:
  • Does the flow switch work properly for water?
  • Does the flow switch work properly for NOVEC 1200 liquid?
  • Does the smoke detector work properly in this kind of environment?
  • Does the fire alarm manual pull station work in the explosive environment?
  • Does the fire alarm panel perform properly for the release of chemicals?
  • Etc.

What "Rated for Use" really means is that a third party testing facility has tried the device out to see if it is safe. The third party has made sure the device will do what it is rated for.

A third Party Testing Facility doesn't have "skin-in-the-game"; the facility doesn't have anything to gain or lose when they say something can be used, so their opinion is considered better than the manufacturer's opinion.

Bottom line, to find out whether a particular flow switch or pressure switch can be use with NOVEC 1230 liquid, check to see if it has been "Rated for Use" with NOVEC 1230.







Douglas Krantz

Describing How It Works
writer@douglaskrantz.com
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612/986-4210

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Electrical Flow


On this website, most references to electrical flow are to the movement of electrons.

Here, electron movement is generally used because it is the electrons that are actually moving. To explain the effects of magnetic forces, the movement of electrons is best.

Conventional current flow, positive charges that appear to be moving in the circuit, will be specified when it is used. The positive electrical forces are not actually moving -- as the electrons are coming and going on an atom, the electrical forces are just loosing or gaining strength. The forces appear to be moving from one atom to the next, but the percieved movement is actually just a result of electron movement. This perceived movement is traveling at a consistent speed, usually around two-thirds the speed of light. To explain the effects of electrostatic forces, the movement of positive charges (conventional current) is best.

See the explanation on which way electricity flows at www.douglaskrantz.com/
ElecElectricalFlow.html
.