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    Small changes in efficiency are hard to...

    Small changes in efficiency are hard to accurately detect under real operating condition. Coupon tests are a good way to look at corrosion rates. The presence of scale can be visually checked for...
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    Check out ELODRIVE actuators at...

    Check out ELODRIVE actuators at http://www.elodriveusa.com. They make some good stuff and can directly replace a Belimo actuator.
  3. If you can get an ASHRAE Handbook - Fundamentals,...

    If you can get an ASHRAE Handbook - Fundamentals, look in the section on psychrometrics.
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    nytech, What do use use pneumatically to sense...

    nytech,

    What do use use pneumatically to sense enthalpy? The only thing I have seen for that is an old Honeywell receiver controller.

    Pneumatic control systems can be good but they quickly get...
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