Electrical Conductivity or Resistance Level Transmitters
Description
Electrical Conductivity or Resistance Level Transmitters are devices used to measure the level of a liquid within a container by assessing the electrical properties of the liquid. These transmitters utilize the conductive or resistive properties of the liquid to determine its level, providing a continuous output signal that corresponds to the level of the liquid.
Working Principle
Electrical Conductivity or Resistance Level Transmitters operate by applying a low-voltage power source across separate electrodes. When a conductive liquid contacts both probes, it completes a conductive circuit, allowing the transmitter to measure the resistance or conductivity of the liquid. This measurement is then used to determine the liquid level. These transmitters are particularly useful because they provide accurate and reliable measurements in environments where other types of sensors might fail due to fouling or other issues. The use of AC voltage across electrodes, as seen in some designs, allows for precise conductivity determination, which is crucial for applications requiring high accuracy.
Applications
These transmitters are commonly used in industries where monitoring the level of conductive liquids is essential. For example, they are employed in water conditioning and purification stages to detect minute levels of impurities in ultrapure water. They are also used in industrial processes where maintaining specific liquid levels is critical for operational efficiency and safety.
Advantages over other Level Transmitters
Electrical Conductivity or Resistance Level Transmitters offer several advantages over other types of level transmitters. They are particularly resistant to fouling, which makes them suitable for environments where other sensors might become clogged or less effective. Additionally, their ability to provide accurate measurements in high-conductivity ranges makes them ideal for applications requiring precise monitoring.
Limitations
One limitation of these transmitters is that they are only suitable for conductive liquids. Non-conductive liquids cannot complete the circuit necessary for measurement, rendering these transmitters ineffective in such scenarios. Additionally, the presence of impurities or changes in the liquid's composition can affect the accuracy of the measurements.
Considerations
When considering the use of Electrical Conductivity or Resistance Level Transmitters, it is important to evaluate factors such as initial costs, operating expenses, and maintenance requirements. These transmitters may have higher initial costs compared to simpler level measurement devices, but their durability and accuracy can justify the investment in applications where precise level monitoring is critical. Operating expenses may include regular calibration and maintenance to ensure continued accuracy, especially in environments where the liquid's properties may change over time. Replacement and maintenance costs should also be considered, as these can impact the overall cost-effectiveness of the system.
from Winland Electronics, Inc.
Winland offers three WaterBug ® models for dependable water detection. Ideal for basement sump pumps, drain storage areas, computer rooms, document storage areas, warehouses and sprinkler systems. WaterBug ® sensors work by forming a conductive bridge between to contacts. Use in... [See More]
- Meter Technology Type: Electrical Conductivity or Resistance
- Level Measurement Type: Single Point or Multi-Point Level
- Media Type: Liquid
- Operating Temp: 32 to 140
from Keller America, Inc.
The CTD versions of the DCX-22 range are autonomous battery-operated data collectors made of stainless steel. CTD stands for Conductivity, Temperature and Depth. Requiring little maintenance, they record the water level (pressure), temperature and conductivity over long periods. Conductivity is... [See More]
- Meter Technology Type: Electrical Conductivity or Resistance; Pressure Membrane
- Level Measurement Type: Continuous Level
- Media Type: Liquid
- Operating Temp: 14 to 104
from Alfa Laval Inc.
The Alfa Laval Potentiometric Level Transmitter is designed specifically for small tanks containing highly viscous and pasty products, such as ketchup, honey and toothpaste. Compact, hygienic design. The Alfa Laval Potentiometric Level Transmitter is designed specifically for small tanks containing... [See More]
- Meter Technology Type: Electrical Conductivity or Resistance; Other (Such as tilt etc.)
- Level Measurement Type: Continuous Level
- Media Type: Liquid
- Output Options: AnalogCurrent
from PMC Engineering LLC
The PMC VersaLine ® VL4500 Series submersible transmitters are specifically designed for depth and level measurements of groundwater, wastewater, and sea water. Typical applications are small size bore holes, wells, dams, irrigation, sewage lift stations, rivers and oceanography. The titanium... [See More]
- Meter Technology Type: Differential Pressure Sensors; Electrical Conductivity or Resistance
- Level Measurement Type: Continuous Level
- Media Type: Liquid
- Output Options: AnalogVoltage; AnalogCurrent
from Winland Electronics, Inc.
Winland offers three WaterBug ® models for dependable water detection. Ideal for basement sump pumps, drain storage areas, computer rooms, document storage areas, warehouses and sprinkler systems. WaterBug ® sensors work by forming a conductive bridge between to contacts. Connect up to 8... [See More]
- Meter Technology Type: Electrical Conductivity or Resistance
- Level Measurement Type: Single Point or Multi-Point Level
- Media Type: Liquid
- Output Options: Alarm / Visual Indicator
from Keller America, Inc.
These piezoresistive pressure transmitters are approved for use in high explosive gas and dust atmospheres of groups I (mining industry) and II (industrial applications) where there is a high risk of explosion. Optionally available are Low Voltage Versions (LV) with 3,5 ق 8,5 V. Signal... [See More]
- Meter Technology Type: Differential Pressure Sensors; Electrical Conductivity or Resistance
- Level Measurement Type: Continuous Level
- Media Type: Liquid
- Output Options: AnalogVoltage; AnalogCurrent
from PMC Engineering LLC
The PMC VersaLine ® VL5000 Series submersible transmitters are designed for depth and level measurements of ground, surface, waste, and sea water. Suitable for small size bore holes, wells, dams, irrigation, sewage lift stations, rivers and oceanography. The VL5000 has been specifically... [See More]
- Meter Technology Type: Differential Pressure Sensors; Electrical Conductivity or Resistance
- Level Measurement Type: Continuous Level
- Media Type: Liquid
- Output Options: AnalogVoltage; AnalogCurrent
from Keller America, Inc.
The 36 Xi W series is built on the latest-generation microcontroller platform, which KELLER has developed to meet extremely high precision requirements and increase compatibility with a wide variety of interfaces. Along with pressure (level) information, digital interfaces also transmit other water... [See More]
- Meter Technology Type: Differential Pressure Sensors; Electrical Conductivity or Resistance
- Level Measurement Type: Continuous Level
- Media Type: Liquid
- Output Options: AnalogVoltage; AnalogCurrent
from PMC Engineering LLC
PMC has engineered a rugged side entry cable with optional wedge nosecone to facilitate the use of their submersible transmitters inside pipes where the level measurement is required under flowing conditions. This is offered as a standard option for “ ¾ ” inch diameter... [See More]
- Meter Technology Type: Differential Pressure Sensors; Electrical Conductivity or Resistance
- Level Measurement Type: Continuous Level
- Media Type: Liquid
- Output Options: AnalogVoltage; AnalogCurrent
from Keller America, Inc.
The Series 26 W transmitter utilizes the Series 10 piezoresistive capsule, which is housed inside a submersible 316 L stainless steel body as standard. For corrosive applications Hastelloy diaphragms and other materials are available as options. Series 26 W vented gauge versions have cable with... [See More]
- Meter Technology Type: Differential Pressure Sensors; Electrical Conductivity or Resistance
- Level Measurement Type: Continuous Level
- Media Type: Liquid
- Output Options: AnalogVoltage; AnalogCurrent
from PMC Engineering LLC
The MTM 3000 Miniature depth and level pressure sensor is available for applications where space is very limited. The housing diameter of 0.39 inches offers the user an ideal high performance level measurement in small diameter, i.e. 1/2" monitoring wells, stand pipes and bore holes. The Titanium... [See More]
- Meter Technology Type: Differential Pressure Sensors; Electrical Conductivity or Resistance
- Level Measurement Type: Continuous Level
- Media Type: Liquid
- Output Options: AnalogVoltage; AnalogCurrent