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Anyone use electronic hourmeters as mercury type replacements?

Discussion in 'Hobby Electronics' started by Geoff C, Mar 21, 2013.

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  1. Geoff C

    Geoff C Guest

    With mercury type hourmeters now banned in EU, ineed to quickly
    find an alternative. I have seen brands such as curtis and ENM
    but neither have exaclty what I am after. Prefer not to go
    custom made or modified. The most likely is LCD type.

    Specs are

    requirement: 7000 units over 2 years
    at least 2000 hours up to about 10000 hours.
    No better than 1/10 hour resolution required. 1 hour resolution
    OK for digital type.
    Bargraph type can be considered
    Battery powered and time stored by eeprom or similar
    User intervention to show time acceptable, unit usually not
    visible to user
    Trigger voltage lower than 2 volts if possible.
    External triggering to be achieved by timer being in a current
    source circuit with 300mA, so high triggering voltage (>2volts)
    means high current dissipation. (ie burden voltage)
    can possibly tolerate high burden voltage of 4.5 volts if all
    other parameters met.
    size- not bulky 60mm*12mm*12mm is ideal.
    cost $5 to $10

    Can anyone point me to an alternative?
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