What type of level gauge is suitable for septic tanks?
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This post was last edited by zhoudingshengs on 2023-11-13 at 14:42. First, it is necessary to consider the conditions at the site: whether it is domestic wastewater or industrial wastewater. Industrial wastewater usually contains heavy metals and other substances, so non-contact measurement methods are generally preferred. For domestic wastewater, if there aren’t many impurities, an immersed type can be used; however, when there is a lot of sediment and impurities, a contactless type is preferable. Wastewater treatment should also include a recovery process, such as the collection of organic water from various tanks; usually, a submersible device is sufficient for this purpose. In short, pay attention to the following points: 1. There is a lot of impurity precipitation; no contact is required. 2. Highly corrosive, non-contact. 3. Foam ozone tank environment, pressure-activated type. Generally, ultrasonic waves are used for contactless methods, and the choice can be made based on the specific situation. If a pressure-fed type is suitable, use it whenever possible; additionally, ultrasonic waves cannot be used in sealed tanks under high pressure.
The primary considerations when choosing a level gauge for sewage tanks are the nature of the sewage and the conditions inside the tank. If it is domestic wastewater with few impurities, an immersion level gauge can be used ； In the case of industrial wastewater or water containing a high amount of sediments and heavy metals, it is recommended to use non-contact level gauges to prevent corrosion and blockages. The following are some recommendations for selecting common types of level gauges: 1. **Ultrasonic level gauge**: Suitable for non-contact measurement, and can function well in most sewage tank environments. Especially for wastewater containing impurities, sediments, or corrosive chemicals, ultrasonic level gauges do not need to be in direct contact with the wastewater; therefore, they are more durable and stable. It should be noted, however, that ultrasonic level gauges may be affected in situations with a lot of foam or large pressure changes in the space. 2. **Radar level gauges**: This is also a non-contact measurement method suitable for complex industrial environments, especially for monitoring the level of liquids that are hot, high-pressure, or corrosive. Radar level gauges have strong anti-interference capabilities and high accuracy. 3. **Magnetic flap level gauge**: Suitable for on-site reading with visual indication; it is more intuitive than electronic level gauges, but may not be suitable for certain highly corrosive wastewater. 4. **Float-type level gauge**: This is a relatively classic type; it is simple and inexpensive, but the float may get stuck due to impurities and sediment in the wastewater. 5. **Hydrostatic level gauge**: If the conditions in the sewage tank permit, a hydrostatic level gauge can be used. This type of level gauge determines the liquid level by measuring the hydrostatic pressure exerted on the sensor by the liquid. In general, the specific site conditions (such as impurities, pressure, temperature, corrosiveness, sealability, etc.) should be considered when selecting a suitable type of level gauge. In some special cases, such as when there is high pressure inside the sealed tank or during organic solvent recovery, the appropriate type and material of level gauge can be selected based on the specific operating conditions, in order to ensure accurate measurements and the long-term stable operation of the equipment. .
Let’s take a practical design example: a project featuring a pool with a depth of 6 meters, containing domestic wastewater; there is a large amount of foam floating on the surface, the temperature ranges from 30 to 45 degrees, and there is plenty of steam in the pool. Initially, an ultrasonic level gauge was planned for use; however, it was later considered that water condensation would occur at the probe, leading to frequent fluctuations in the output. Finally, a new selection is made. In such cases, a magnetic flap level gauge (also known as a magnetic float level gauge) can be used. If the system is not sealed, it is recommended to use a submersible level gauge, as this can help eliminate the impact of excessive foam. If the sewage tank is above ground level, a double-flange level gauge can be employed to avoid the effects of surface foam as well.
Haha, it’s great! Haha, it’s really nice
Using ultrasound is quite convenient, and it isn’t expensive
In your case, with a large amount of water vapor present, ultrasonic sensors certainly won’t work well; it is recommended to use radar level gauges, which offer high accuracy and are resistant to interference
In areas where there is water vapor, try not to use ultrasonic level gauges.