0.75" Solenoid Valve for Bromine 24vac 12vdc PULSV Sens-R-Trol Accessories. PULSVSens R Trol is a combined sensor and electronic control which maintains the level of almost any sanitising chemical in your pool or spa. Sens R Trol should be used with a pool chemical dispensing device such as a chlorinator or brominator. Sens R Trol monitors the pool or spa whenever the pump is running to ensure that the sanitiser level is perfect. All you need to do is maintain a stable pH. Set the desired chlorine or bromine level and Sens R Trol