Intrinsically safe solenoid valves
Intrinsically safe solenoid valves
(OP)
We specified solenoid valves for our ON/off valves to work with 120 VAC. Some of these solenoid valves must operate in a classified area and require to be intrinsically safe. The vendor says that is impossible to obtain intrinsically safe solenoid valves operating at 120 VAC. Any information about it?





RE: Intrinsically safe solenoid valves
respectfully
RE: Intrinsically safe solenoid valves
If you are designing or specifying equipment for a hazardous area then get help from someone who knows what they are doing. The questions you are asking demonstrate that you don't have sufficient knowledge to do this design to a competent level. There are the obvious safety implications of getting it wrong and under the European ATEX legislation both you personally and your employer are liable for the installation design. I am unsure what applies in the rest of the world.
----------------------------------
Sometimes I only open my mouth to swap feet...
RE: Intrinsically safe solenoid valves
Is it positive that these valves don't exist even for the small sizes?
RE: Intrinsically safe solenoid valves
http:/
RE: Intrinsically safe solenoid valves
You will not find 120Vac IS valves. 120Vac will only come in EXP explosion proof style.
RE: Intrinsically safe solenoid valves
RE: Intrinsically safe solenoid valves
They're interesting - they use a capacitor to store enough charge for pull-in, so they're a little sluggish to respond according to ther datsheet, but they might be very useful in certain designs. Definitely a product to bear in mind for the future. If only they were available with an ATEX certification...
----------------------------------
Sometimes I only open my mouth to swap feet...
RE: Intrinsically safe solenoid valves
I design I.S. equipment. Capacitors are one of the great, 'must avoid', evils because obviously they can take some dribble thru a barrier and pile up a huge amount of ignition energy.
Asco has cleverly gotten around it by making those valves actually EXP valves driven via I.S. sources. This also explains how they can get around the REALLY serious energy associated with an operating solenoid. They house the CAP and the Solenoid in an EXP housing and double diode protect the supply line from ever seeing any of the cap or inductor energy.
I like it!
It will of course have speed issues.
Normally people do it the standard way of running whatever dang solenoid/valve they want outside the hazardous area and just run air into the area. Most applications can handle the typically small delays incurred.
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Intrinsically safe solenoid valves
What type of instruments do you have that are Intrinsically Safe and operate at 120VAC. What Barriers do you use and what Class/ Division (or zone) are they operating in.
I am interested as I had never seen anything I.S. with such a high voltage before.
RE: Intrinsically safe solenoid valves
----------------------------------
Sometimes I only open my mouth to swap feet...
RE: Intrinsically safe solenoid valves
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Intrinsically safe solenoid valves
----------------------------------
Sometimes I only open my mouth to swap feet...
RE: Intrinsically safe solenoid valves
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Intrinsically safe solenoid valves
Apparently, the ATEX version is handled by ASCO's Joucomatic division.
The IS valves are known as ISSC, series V1050-2
Go to
htt
scroll down more than half way to find the link to the spec sheets for the ATEX I/S offerings:
EEx i (intrinsically safe), ATEX
Dan
RE: Intrinsically safe solenoid valves
----------------------------------
Sometimes I only open my mouth to swap feet...