The only sure way to tell if a element is faulty, even if all the above faults are present, is to use whats called a ohmmeter, a ohmmeter is a device used for testing all types of electrical values, including resistance between 2 conductive device. To test if a element is working or not a engineer would connect a ohmmeters live and neutral wires to the corresponding connectors on the element and check for a positive reading, no reading would mean a faulty element, the engineer would also use the ohmmeter to read across both terminals again and the earth terminal on the element but in this case a positive reading would mean a faulty element and a negative reading would mean no fault on the earth to live and earth to neutral connectors
Because they're not externally adjustable, they don't need to be located close to the control panel. Depending on your application, you might want your salvaged pressure switch to operate at pressures that are different to its standard range. That's not hard to do if you have a washing machine pressure switch, as they are quite easy to modify.In standard form, turning the adjustment control typically allows the trip pressure to be set to detect water depths anywhere from 9cm to 20cm. But if you remove the adjustment.