REQ: coil volatage on old relay

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Cap'n John - 27 Jun 2007 20:43 GMT

Got a 1960s vintage sealed relay with an octal base, DPDT but no indication
of coil voltage. Part No. is C.P. Clare HG2A1016.

Any help appreciated- I just may have a use for this puppy!!

TIA!

Cap'n John

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Gerard Bok - 27 Jun 2007 21:45 GMT

>Got a 1960s vintage sealed relay with an octal base, DPDT but no indication
>of coil voltage. Part No. is C.P. Clare HG2A1016.
>
>Any help appreciated- I just may have a use for this puppy!!

Use an ohm-meter to find the coil connections.
Use a variable psu.
The point where the relay engagess is usually around half the
rated voltage.

Signature

Kind regards,
Gerard Bok

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Al - 27 Jun 2007 21:46 GMT

> Got a 1960s vintage sealed relay with an octal base, DPDT but no indication
> of coil voltage. Part No. is C.P. Clare HG2A1016.
[quoted text clipped - 4 lines]
>
> Cap'n John

I have a bunch of old Potter & Brumfield ones. They are all 24VDC.

You might try this. Use a variable dc power supply. Connect to the coil
leads at zero volts. Increase the voltage until the armature moves. This
is the pull-in voltage. Write it down. Now drop the voltage and wait
until the armature drops down. this is the drop-out voltage. Now add the
drop-out voltage to the pull-in voltage. Then go to the nearest highest
value that makes sense, like 5V, 6V, 12V, 24V, 48v... this could then be
used as your coil rating. Run it at that voltage for a while. Monitor
the current and the temp. If it doesn't run away, you're good.

Al

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Mark Zenier - 28 Jun 2007 20:44 GMT

>Got a 1960s vintage sealed relay with an octal base, DPDT but no indication
>of coil voltage. Part No. is C.P. Clare HG2A1016.
>
>Any help appreciated- I just may have a use for this puppy!!
>
>TIA!

dig, dig,

Don't open it up, it looks like it's a Mercury Wetted relay.
Have not found that exact number yet.

Clare became part of General Instrument sometime back then,
And since then sold off.

The one page I found with specs shows a wide range of voltage
drive. A minimum voltage given as a "Must Opr. VDC", and
a "Max VDC". For the HG2A1003, it's 15 and 36 volts, respectivly.

Yow, $87.10 back in 1986.

Mark Zenier mzenier@eskimo.com
Googleproofaddress(account:mzenier provider:eskimo domain:com)

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Cap'n John - 30 Jun 2007 02:21 GMT

>>Got a 1960s vintage sealed relay with an octal base, DPDT but no
>>indication of coil voltage. Part No. is C.P. Clare HG2A1016.
[quoted text clipped - 19 lines]
> Mark Zenier mzenier@eskimo.com
> Googleproofaddress(account:mzenier provider:eskimo domain:com)

Hi Mark-

That's an affirmative on your last- the relay is a mercury wetted contact
type, which is why I want to use it- I need to switch some milliamp level
9VDC signals. Coil is pins 7 & 8. I can bench test it as others have
suggested if necessary, but would like to know what Clare/General
Instruments had to say if possible, esp. if the coil is AC or DC.

Have had the relay for decades- no clue where I originally came up with
it- prob. Mil. surplus somewhere.

Thanks for your help.

Regards,

Cap'n John

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Electronics Forum / Electronics / June 2007

REQ: coil volatage on old relay