FT60 – Downhole Submersible Level Sensors
The FT downhole submersible liquid level sensor indicates the level of liquid by continuously measuring hydro-static pressure with a sophisticated sensing element.
The downhole submersible liquid level sensor indicates the level of a fluid by continuously measuring hydrostatic pressure. Also known as the head pressure, hydrostatic pressure is the pressure exerted by the fluid in the vessel. The level of hydrostatic pressure as measured by the level sensor is determined by two things: the density of the liquid and its height. With liquid density remaining constant, changes in the pressure necessarily reflect a difference in the liquid level. Submersible level sensors consist of a sensor attached to a long cable, which is then lowered to the bottom of the liquid vessel. The compact, sophisticated nature of the sensor unit, along with the possibility of cable lengths up to 2,500 feet in special situations, makes submersible level sensors particularly versatile.
The FT60 liquid level sensor transmits its data with a 4-20 mA output signal. This design provides for excellent linearity and repeatability, low hysteresis and long term stability. The FT sensor is easy to install. All the electronics are mounted in a submersible 316 stainless steel housing, with a standard polyurethane cable and Viton seal.
A special cable support bracket is also available. This gives extra stability to the transducer when used with longer lengths of cable (up to 2500 feet) or when used in an agitated liquid. A conduit adapter is also available.
The FT is also available calibrated for any span needed, from 0-6 PSI ( 0.4 bar, 14 ft or 4.2m of water) to 0 to 300 PSI (20 bar, 0-690 feet or 0-211 meters of water). Other optional outputs include 0.5 to 4.5 VDC, 1 to 5 VDC, 1 to 6 VDC, or 0 to 5 VDC.
The Submersible Hydrostatic Level Sensor is ideal for harsh environments like tanks. The sensor sits at the bottom of a tank or vessel with a long lead line. Based on the pressure exerted on it by the liquid medium above, the weight, as well as the volume, can be determined. Along with the total vessel capacity, this can be used to calculate internal liquid levels. Downhole Submersible Level Sensors are also capable of continuous level sensing and capable of environmental applications like ultrasonic sensors.