Pump Control and Level Alarms

Two SLT32’s are installed at this new highway Service Center which includes a 50-bed hotel, gas station and restaurant. It is located on Hwy 401 at Cornwall, Ontario.

The center did not have access to municipal water so they drilled wells and installed a water treatment system. The PZ32T ultrasonic sensors were mounted underground in concrete water tanks. The tanks are 9 ft / 3 m deep. The SLT32 electronics were mounted in nearby buildings.

The SLT32 handles pump control and level alarms.The feedwater pump is turned ON when tank level is low, and OFF when the tank is full. Three more SLT32 relays are used for Lo alarm, Hi alarm, and HiHi alarm. The underground water tanks also serve as chlorine contact chambers so the non-contacting SLT32 was ideal.

SLT32 installation was performed by electrical contractors. One ultrasonic sensor was damaged and had to be replaced at start-up (the SLT32 reported SENSOR SHORT to help identify the problem). Project engineering was by Thompson Rosemount of Cornwall, Ontario.

Also ideal for pump stations, wet wells and tank level control with a non-contacting ultrasonic sensor mounted above the liquid is the new Greyline PSL Level Controller. It has 6 independently programmable control relays for pump or valve control, level alarms, dialers, temperature alarm and echo-loss alarm.

PSL Relay/Pump run time data is stored automatically by the instrument. Retrieve reports directly through the PSL display, or through its RS232 output. The PSL Remote Windows software program displays a pump run time graph and will output data to a spreadsheet file or directly to a Microsoft Excel spreadsheet with DDE.