Electrode Level Gauge
The electrode level gauge is a reliable, cost-effective solution for precise liquid level measurement across various industries. It utilizes a series of high-quality electrodes to detect liquid levels in tanks, vessels, or containers, ensuring accurate and consistent readings for water, oil, chemicals, and corrosive liquids. Explosion-proof models are available, making it ideal for hazardous environments.
The intelligent universal electric contact liquid level monitor is an advanced instrument combining a measuring cylinder, ultra-pure ceramic electrodes, and a display unit. It features red and green LED indicators to simulate steam (red) and water (green), clearly showing the liquid level position in the container. The device also offers over-limit alarms and output signals for remote monitoring and control.
This side-mounted electrode level gauge, with 4–20 mA output, is especially suitable for boiler water tanks, providing reliable and continuous liquid level measurement in demanding applications.
Key Features
uct Feature
- The display part of the instrument adopts analog display and digital display at the same time to display the rise and fall of water level in a very intuitive and real-time manner.
- The number of display points can be set arbitrarily within the range of 6-19 points according to the user’s needs.
- The scale value of each scale can be set arbitrarily through panel operation, and the scale can be replaced conveniently according to the scale value, which overcomes the disadvantages of the old instrument such as poor universality, non interchangeability, and many specifications and varieties of spare parts.
- u it has the function of sound and light alarm for liquid level exceeding limit and multiple alarm modes selection. The position of alarm point can be set arbitrarily within the scale scale scale range.
- With the function of automatic judgment and tracking of water resistance, this instrument can test each electrode separately, and display the water resistance (steam resistance) value at each point, so that you can find and judge whether the electrode works normally in time, help you decide whether the whole set of electrode needs to be cleaned or replaced, and accurately provide the adjustment parameters of the critical face value of vapor-liquid.
- It has strong fault tolerance. Due to the use of intelligent water level recognition technology, in the case of abnormal operation of individual electrodes, the instrument can still display the correct water level value, and immediately display the abnormal electrode on the panel scale in the form of flashing to remind you to carry out maintenance and replacement, overcoming the defect that the old instrument electrode can only be found after it is damaged.
- Strong anti-interference ability. Advanced digital filtering technology is adopted for the input link, and the electrode state judgment function with back difference is adopted, which greatly improves the reliability and anti-interference ability of the instrument. Delay alarm is adopted for the output link to prevent false alarm in case of strong instantaneous interference.
- The current output adopts a high-precision linear output mode (determined according to the setting value of the scale range), which avoids the blind end of the non-linear output of the old instrument and the signal transmission failure of the DCS system.
- The low-voltage protection technology is adopted in the self-supply power supply, which overcomes the battery damage after the old instrument self-supply power supply.
- Intelligent universal liquid level monitor can replace all the old products of electric contact liquid level monitor. All its interfaces are compatible with the old instruments and can directly replace the old instruments without any changes.
Application
The electric contact level monitor is suitable for the level measurement and control of conductive liquid. It is mainly used to monitor the water level of steam bubble, high and low pressure heater, deaerator, evaporator, condenser, Start-up Separator of once through boiler and other water tanks. But it is not suitable for inflammable and explosive occasions
Specifications
| Liquid water resistance range: | 0—500kΩ（automatic tracking） |
| Analog display: | A group of color changing LED (up to 19 points, special specification up to
38 points) displays the real-time liquid level value in the way of steam red, water green and scale scale scale |
| Digital display: | One compliance tube, three digit nixie tube (or four digit nixie tube) displays
the real-time liquid level value in digital mode |
| Lead length from ultra pure ceramic electrode to secondary instrument: | ≤200m |
| Isolated output: | 0～10mA（RL＜1kΩ＝，4～20mA（RL＜500Ω）（linear） |
| Alarm output contact capacity: | AC220V, 1A;
Four groups of normally open and normally closed contacts (two positions for upper and lower limits) are available, with special requirements. Six groups of normally open contacts can be provided and five groups and four groups of different combinations (three upper and three lower, three upper and two lower, two upper and three lower, three up per and one lower, one upper and three lower) can be carried out |
| Power supply time of DC battery in the unit | ≥1H |
| Working power supply: | AC220V±10%，50Hz±1Hz |
| Working conditions of the instrument: | ambient temperature：-10℃～+45℃；relative humidity：≤85% |
| Instrument opening size: | 152+1×76+1 or 152+1×152+1mm |
| External dimension of instrument: | Vertical type：80×160×150mm（width×height×length）
Square Shape：160×160×150mm（width×height×length） Horizontal type：160×80×300mm（width×height×length） Wall mounted：173×225×80mm（width×height×length） |
How does an electrode level gauge measure liquid levels, and what makes it different from other sensors?
The electrode level gauge detects liquid level based on the difference in electrical conductivity between liquid and air/steam. When electrodes are immersed in liquid, they complete an electrical circuit, sending a signal to the display or control system. Compared with ultrasonic or radar sensors, electrode liquid level sensors are simpler, cost-effective, and ideal for conductive liquids such as water, boiler water, and chemical solutions. Non-contact technologies may suit corrosive or high-temperature media but are generally more expensive.
How do I choose the right electrode liquid level sensor for my tank or boiler application?
Selecting the appropriate electrode level gauge involves:
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Measurement range & electrode count: More electrodes allow finer resolution.
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Tank/boiler dimensions & mounting: Side-mounted sensors are ideal for retrofits.
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Medium type: Choose corrosion-resistant electrode materials for chemical liquids.
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Output signal: Standard 4–20 mA for PLC/DCS integration, optional 0–10 mA or relay alarms.
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Safety: Explosion-proof electrode level sensors are required for flammable or hazardous environments.
| Application | Recommended Sensor | Key Features |
|---|---|---|
| Boiler water | Boiler-specific electrode level gauge | Steam/water phase detection, LED indicators, alarms |
| Water tank | Standard electrode liquid level sensor | Multi-point measurement, 4–20 mA output, side mount |
| Chemical tank | Explosion-proof electrode level sensor | Corrosion-resistant, anti-interference, certified housing |
Can electrode liquid level sensors operate in high-temperature or corrosive conditions?
Yes. Explosion-proof and high-temperature electrode level gauges are available. Electrode materials like stainless steel, Hastelloy, or titanium can resist corrosion. High-performance insulation ensures accurate measurement in challenging environments. For high-temperature or chemical media, ceramic electrodes or specialized housing designs are recommended, ensuring long-term reliability.
What is the measurement accuracy and reliability of an electrode level gauge?
Typical accuracy is ±5–10 mm, depending on electrode spacing and installation. Reliability factors include medium conductivity, electrode spacing, turbulence, and electrical interference. Advanced models feature automatic water resistance tracking, strong anti-interference design, and fault tolerance to maintain stable and accurate readings in boilers, water tanks, or chemical tanks.
| Factor | Impact | Mitigation |
|---|---|---|
| Low conductivity | Weak signal, possible misreading | Use higher voltage or sensitive electronics |
| Foam or vapor | False electrode contact | Proper electrode type and mounting |
| Electrical interference | False alarms | Shielding and filtering circuits |
What output and integration options are available for electrode level sensors?
Electrode level gauges offer flexible output options:
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Analog: 4–20 mA standard for PLC/DCS/SCADA integration
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0–10 mA or 0–5 V for specialized control systems
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Relay contacts for alarms or interlocks
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Optional digital communication for smart instrumentation
This allows seamless integration into monitoring and process control systems while maintaining real-time accuracy.
What OEM / ODM customization services are offered for electrode level sensors?
We provide full OEM and ODM services for electrode liquid level sensors, including:
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Custom measurement ranges, number of electrodes, probe length, and spacing
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Material selection for corrosive, high-temperature, or specialized media
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Standard or explosion-proof enclosures for hazardous environments
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Output customization: 4–20 mA, 0–10 mA, relay, or alarm logic
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Display and panel configuration: LED/LCD, analog + digital display, remote monitoring
Our factory supports prototype development and batch production, ensuring stable performance, high reliability, and full technical support across all industrial applications.
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