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Hi Andy,

I have a new Elster BK-G16M meter installed by my supplier in January with reed switch pulse counting assy IN-Z61 attached.  This has 4 terminals on an RJ11 modular socket on the underside of the module.

http://www.uk-metering.net/downloads/G_Range_Pulse_Unit_-_INZ-61.pdf

If you look at the pdf you will see that the outer terminals on the IN-Z61 are labelled 'alarm' so it may be that of your meter's 4 wires 2 are for anti-tamper when connected to a recording device.  They can probably be ignored for your project's purposes.

I'm not currently picking up the pulses but do plan to do so in my OEM project.

I hope that helps.

Steve

If it has a reed switch, a multimeter will show that. I think the likeliest is one pair of wires will be a short-circuit loop that is used to assure that the meter is still on the end, and the other pair will be the reed switch.

Though I think it unlikely, it might possibly be an optical beam-break detector, an emitter LED on one pair and a photo-transistor detector on the other. If your multimeter has a transistor tester, that might respond to the transistor part, but the emitter LED is likely to need more voltage than your meter can supply, and you'd need to feed that with current before the transistor would react.

Thanks for the replies.

Testing with a multimeter indicates that three of the cores are shorted together, and you get 2 pulses per revolution between any of these three and the remaining (red) core.