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#SWITCH ORIENTATION PRINCIPLE APP HOW TO#
How to access Australian Government information.Freedom of information Open sub menu for Freedom of information.Australian Privacy Principles guidelines.This is old technology and is seldom used. One of the main limitations is the high maintenance required in order to keep the tape clean and prevent it from gumming up. More advanced controllers are available that monitor tank capacity and pumping rates to check the actual level, rate of change and direction of change.
This problem can be protected against by the use of a separate high level switch.
Tanks controlled using tape level gauges will often overflow when the tape is stuck. The force from the float weight is usually great enough to overcome the friction of the tape against the impurities, whereas the force of the take-up device may not. These problems are more likely to result in a lower than actual reading. This often occurs if the long guide pipes are not perfectly vertical, where the tape rubs against the inside of the pipes.Īnother common problem is with corrosion or dirt, where the tape can be held in place while the float is moving. However in pressurised applications, it is better to fill the head with the sensing fluid, particularly if the fluid is clean and lubricating.įloat and tape systems have a common problem with the tape hanging up. In atmospheric conditions, a seal is used to protect the sensing head from the process fluid. The rotary motion of the shaft is used to give a metric readout. The shaft on the counter drive rotates as the float moves the perforated tape up and down. Tensioning of the tape storage reel is sufficient to ensure correct measurement, while not affecting the position of the float. Any slackness in the tape is taken up by the tape storage reel which is tensioned. The perforated tape is received in the gauge head by a sprocketed counter drive. The tape is connected to the top of the float and runs directly up and over pulleys then down to the gauging head which is outside the tank at a suitable level for viewing. The guide wires are connected to top and bottom anchors and assist in positioning the float as it moves with the fluid level. 20m), wire-guided float detectors can be used. Other systems use the float method by sensing the position of the float magnetically or electrically.įloat systems can also be used when measuring granular solids as well as liquids.įor large level measurements (ie. Note: This animation only for understanding the concept. The float contains a magnet which changes the orientation of small indicator wafers as it moves up and down. The twisting force drives the position of a pointer which then indicates liquid level.įor some applications – where the liquid is corrosive, toxic or in some way hazardous – a magnetic level gauge is used. The float is connected to the torque tube which twists as the height of the displacement device changes. Other devices transfer the buoyancy force to a metering device using a torque tube. These types of device are often found on large atmospheric storage tanks. The chain is attached to a counterweight which indicates the level as the float moves up and down. One common approach is to attach the float to a chain. The height can be read as the float moves with liquid level.įloat devices use the buoyancy of a float to indicate the liquid level in the tank. One common form of level measuring system uses a tape or servo motor which is connected to a float. There are two main types of buoyancy tape systems available: Buoyancy Tape Systems: Level Indicators classified based on buoyancy are
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