Working Electrical Salinometer

The electrical supply to the salinometer must be DC. The potentiometer is provided to give a fixed standard calibration voltage so that no errors to voltage differences exist.

Pure water is non-conducting so that current flow is an indication of impurities, i.e. the greater the current the greater the impurity in the water.

When the impurity content exceeds a fixed value the current is sufficient to operate the relay 2 so giving visual or audible warning by closing the circuit. Continued operation at increased current would cause Relay 1 to short circuit the meter and so protect it.

Water temperature increases conductivity so that temperature compensation is required. A temperature compensating thermometer is a shunt across the meter. Temperature increase causes a rise of mercury level and a cutting out of resistance which allows more current through the shunt and less through the meter. The correct calibration current through the meter is fixed; current variations due to temperature are shunted.


"Steam Engineering Knowledge for Engineers" by Thomas D. Morton

Read More

More by this Author

Comments 1 comment

Nimso 3 years ago

Principle same for all salinometers...thanks..

    Sign in or sign up and post using a HubPages Network account.

    0 of 8192 characters used
    Post Comment

    No HTML is allowed in comments, but URLs will be hyperlinked. Comments are not for promoting your articles or other sites.

    Click to Rate This Article