REMOTE WATER LEVEL INDICATORS ARE USED TO SHOW THE LEVEL OF WATER INSIDE THE BOILER IN A CONVENIENT PLACE LIKE ECR THERE ARE 2 TYPES OF REMOTE WATER LEVEL INDICATORS :-
- CONDUCTIVITY ELECTRODE :- WATER IS MORE CONDUCTIVE THAN STEAM. A LOW VOLTAGE A.C CURRENT IS APPLIED TO THE ELECTRODE. THE WATER LEVEL IS DETECTED AS SOON AS ELECTRODE. THE WATER LEVEL IS DETECTED AS SOON AS ELECTRODE MAKES CONTACT WITH WATER . ELECTRODE IS SAVED BY PTFE INSULATION.
- CAPACITIVE ELECTRODE :- A METAL ROD, WITH PTFE INSULATION IS FED WITH HIGH FREQUENCY A.C ROD FORMING ONE PART OF THE CAPACITOR WHILE WALL OF PROTECTIVE TUBE FORMING OTHER PLATE. AS WATER RISES, CAPACITANCE CHANGES WHICH LEAD TO A.C CURRENT TO CHANGE. THIS CURRENT IS CONVERTED TO D.C AND SENDED TO CONTROLLER WHICH GIVES THE LEVEL OF WATER PRESENT.