Cảm biến đo mức chất lỏng chìm .

Mercoid® Division thuộc Dwyer Instrument, Inc. thiết kế ra 4 loại cảm biến đo mức chất lỏng dạng chìm với những chức năng khác nhau cho nhiều ứng dụng khác nhau : FBLT, PBLT, MBLT, và SBLT.

Loại cảm biến này đo mức chức lỏng bằng các đo áp suất của chức lỏng từ mặt chất lỏng đến cảm biến . Những cảm biến này chìm hẳn trong chất lỏng và cho ra dữ liệu thông qua đường dây trên đầu chất lỏng .

Hydrostatic pressure is the pressure created by the hydrostatic force per unit area at the base of a column of liquid. This can also be called the pressure head or head pressure and is often referred to as the height of the fluid, such as inches of water column, inches of mercury, or feet of water. The measurement is dependent on the liquid density and independent of the shape of the container. This is based on the property that pressure is equal to density times the height of the liquid.

Áp suất chất lỏng là áp suất được tạo ra từ

Since these instruments are measuring the hydro-static pressure they must compensate for the atmospheric pressure that acts on the fluid surface. Variations of barometric pressure with weather changes will affect the accuracy of readings.

Atmospheric pressure is the pressure due to the force per unit area created by weight of the gases in the atmosphere above that surface where it is being measured. Atmospheric pressure decreases as elevation increases as there is less mass of gases above the point being measured.

For this reason all Mercoid® Submersible Level Transmitters include a vent tube that allows for atmospheric pressure compensation. Standard, Mercoid® installs a maintenance vent filter to protect the sensor from water and debris.

The Model A-297 Desiccant Vent Filter is also available as an accessory to remove humidity from the air entering the vent tube.

When purchasing a Submersible Level Transmitter, the range must be specified at the time of ordering. The range can be ordered in psi, ft of water column, or meters of water column. If the fluid being monitored is not water based, a specific gravity correction may be programmed into the receiving or controlling device connected to the transmitter.