Non Inductive relays

geno54

Trying to locate a source/manufacturer of Non Inductive Relays to be used for oxygen sensors for levels of alarm.

TIA
Geno

scrook_3

Why?

Why non-inductive?

How much current at what voltage? AC or DC?

You may need to think outside-the-box: instead of a classical relay (with its inherently inductive coil), perhaps you could use a solid state "relay" -- essentially a pre-built switching transistor circuit with an essentially resistive control input terminal.

Bob D._2

SSRs

Ditto with the SSRs - Look at:

http://web2.automationdirect.com/adc/Overview/Catalog/Relays_-z-_Timers/Solid-State_Relays

geno54

Non inductive relay

Here is the spec from the Thermox 210 control unit:
Contact Rating: 1A, 30V max. noninductive load, AC or DC

Thanks for your input will look at automation direct. SSR's look like the way to go.
The Ametek engineer is worried about an inductive load affecting there control

Jamie Hall

ah...

there is a big difference between a 'non-inductive relay' and a relay rated for a non-inductive load. A non-inductive relay is, in a sense, a contradiction in terms, as a relay has always meant a device using a solenoid (magnetic coil) to transfer switch contacts. A relay is inherently inductive. Can't get around it. However, a relay can be and frequently is rated to switch a non-inductive load, such as lights or most electronic equipment. The non-inductive load rating applies to the contacts, and may be much higher than the inductive load rating.

If you want an electrical or electronic switching device which does not impose an inductive load on the trigger circuit, you have to go solid state. There are a lot of possibilities...

scrook_2

Non inductive

Ah, the Thermox 210 wants to switch a non-inductive load not more than 1A & 30V, so no motors, etc.

An SSR (solid state relay) is probably the easiest, and perhaps most reliable way to do this, though a small enough relay (e.g 0.1 A at 24V perhaps?) might be okay but you'd want to confirm that first!

Google "Solid State Relay" for suppliers and vendors, or see www.digikey.com www.mouser.com etc.

geno54

Sorry this was piece meal but didn't have all the info in the beginning. Oxygen sensor sends signal to controller. When oxygen level reaches HiHi then shut down burner. The relay between the controller and the burner circuit should be a "non inductive type". Will speak to the engineer again but SSR should suffice.