The 715 Portable provides a simple, low cost method of spot checking the sludge blanket level in a wide variety of settlement tanks. The cable reel design enables the user to store the cable without needing additional carrying bags or cleaning materials.

The sludge blanket is detected by winding the sensor down into the tank, the audible tone will change and the LED illuminates once the sensor has reached the blanket. The markings on the sensor cable are then used to determine the depth of the blanket. Additional markings can be added to the cable to pre-define maximum and minimum sludge blanket positions.

No user adjustment is necessary, the 715 Portable can be used straight from the box, although adjustment of the set point is available internally. The only spare part necessary is a 9V battery. Reliable detection of the sludge interface is necessary to allow operators to de-sludge tanks at the right time. Emptying the tank too often is inefficient in terms of manpower and can have knock on effects on the operation of other parts of the sludge treatment system. Equally allowing the tank to have too much sludge can cause carry over to the next process stage or into the local watercourse. Neither of these scenarios is desirable, and the 715 will provide a quick and easy check on the interface position without relying on operator judgment.

The 715 Portable uses a range of infrared sensors to make the sludge interface detection. Infrared attenuation has been selected as it is ideally suited to detecting the sludge present in the interface zone. This tends to be considerably "thinner" than the sludge that is present at the bottom of a settlement tank.

The sensor should be selected to suit the intended application. The IR40 sensor is the most commonly used sensor and will cover most applications, involving Primary and Secondary Settlement Tanks on sewage treatment works. If the main use is to be on Primary Tanks then the IR15 sensor should be used.

An alternative to the 715 is the 740 Portable Monitor which works with the Soli-Tech 10 Sensor to monitor both Suspended Solids and the Sludge/Water interface. This instrument can be useful in providing a picture of the solids profile through a settlement tank. It can also be used to detect the location of the sludge interface.

Compatible Sensors

  Infrared Sensors