SLDL7520 Magnetic Level Gauge Switch
Introducing our advanced Magnetic Level Gauge Switch, the ultimate solution for measuring liquid levels with precision and ease.
- Product Introduction
Solidat Applied Technologies Ltd. is one of the leading manufacturers and suppliers of sldl7520 magnetic level gauge switch in China, also supports customized service. Please feel free to buy high quality products in stock here and get quotation from our factory. Good service and reasonable price are available.
Introducing our advanced Magnetic Level Gauge Switch, the ultimate solution for measuring liquid levels with precision and ease. Designed to work perfectly with magnetic flap level gauges, this switch delivers stable level detection, accurate alarm output, and automatic monitoring for industrial liquid storage and processing systems.
Features
• Accurate measurement: Our Magnetic Level Gauge Switch provides highly precise measurement readings, ensuring that you get accurate readings every time.
• Easy installation: The installation process of our Magnetic Level Gauge Switch is simple and hassle-free, reducing the need for technical expertise.
• Robust construction: Our Magnetic Level Gauge Switch is built to last, with industrial-grade construction that withstands even the harshest environmental conditions.
• Versatile & Multi-functional Compatibility: Perfectly matched with SOLIDAT SLDL7500 series MagDetect magnetic flap level gauges, supporting both standard local indication and remote transmission models. Compatible with magnetostrictive, guided wave radar and reed switch transmitters, realizing on-site visual display + remote signal output + multi-point alarm control. It adapts to liquid level and interface measurement for multiple media and meets diversified industrial process control needs
Advantages
Cost-effective: Our Magnetic Level Gauge Switch is cost-effective, providing reliable measurements at an affordable price point.
Time-saving: With our Magnetic Level Gauge Switch, you can save time and reduce the need for continuous manual monitoring, allowing you to focus on other essential tasks.
Accurate readings: Our Magnetic Level Gauge Switch ensures that you get accurate readings every time, reducing the risk of errors and inconsistencies.
Applications
Our Magnetic Level Gauge Switch is suitable for a wide range of applications, including:
Our Magnetic Level Gauge Switch, perfectly supporting SLDL7500 series magnetic flap level gauges, is widely applicable for liquid level and interface measurement across multiple industrial scenarios, including:
Water treatment plants: Perfect for measuring liquid levels in water treatment plants, sewage pools and purification tanks, ensuring accurate water treatment and stable system operation.
Chemical & Petrochemical Factories: Provides reliable level and interface measurement for corrosive, high-temperature and high-pressure chemical media. Matches various anti-corrosion gauge materials to ensure safe and efficient production and storage operations.
Food and beverage industry: Ideal for measuring liquid levels in food and beverage processing and storage tanks, ensuring food safety and strict quality control standards.
Power, Papermaking & Metallurgy Industry: Adapts to harsh working conditions of power plant boilers, papermaking pulping tanks and metallurgical storage equipment, realizing stable long-term level monitoring and automatic alarm protection.
Working Principle of Reed Switch (Matched with Magnetic Flap Level Gauge)
The magnetic level gauge switch adopts a high-sensitivity sealed reed switch, which is installed on the outer side of the magnetic flap level gauge main pipe and works based on the magnetic coupling principle, with no direct contact with liquid media and zero mechanical wear.
A permanent magnetic float is equipped inside the magnetic flap level gauge main pipe. When the liquid level rises or falls, the magnetic float moves synchronously with the liquid level. The magnetic field generated by the float's internal magnet penetrates the non-magnetic gauge pipe wall and acts on the preset reed switch.
The reed switch is encapsulated in an inert gas-filled glass tube with two flexible magnetic reeds. When exposed to the float's magnetic field, the two reeds are magnetized and attracted to each other, closing the circuit and outputting a switching signal. When the liquid level changes and the magnetic float moves away from the switch position, the magnetic field disappears, and the reeds rebound automatically to disconnect the circuit, cutting off the signal. Real-time level monitoring and threshold signal triggering are realized through this magnetic on-off cycle, supporting high and low liquid level alarm and interlock control. Cooperated with SLDL7500 series gauges, it can also achieve accurate liquid interface detection for two-phase mixed media, with a minimum interface density difference of only 0.05S.G, realizing precise stratification monitoring.
Wiring Diagram & Wiring Instructions
Our magnetic level gauge switch adopts standard three-wire SPDT (Single Pole Double Throw) output, with universal port definition, compatible with most industrial PLC, alarm buzzers and control systems. The wiring terminals are defined as below:
Terminal 1: Normally Closed (NC): Circuit connected when no magnetic induction; disconnected when liquid level reaches the trigger position.
Terminal 2: Common (COM): Public power supply and signal common terminal, connected to system signal input or power loop.
Terminal 3: Normally Open (NO): Circuit disconnected when no magnetic induction; connected when liquid level reaches the trigger position to output alarm/control signal.
Wiring Specifications & Requirements
Rated working parameters: 220VAC 3A / 24VDC 2.5A, suitable for conventional industrial control loops.
Cable selection: Shielded twisted pair cable is recommended for long-distance wiring to avoid electromagnetic interference.
Protection level: IP67 waterproof and dustproof housing, suitable for indoor and outdoor industrial environments; explosion-proof type Exd II CT6 is optional for chemical flammable and explosive scenarios.
Wiring steps: Open the waterproof junction box, connect cables according to terminal marks, fix the wiring terminals tightly, seal the cable inlet and box cover completely to prevent dust and water ingress.
Compatible Gauge Installation Types: Adaptable to both top-mounted (Type A) and side-mounted (Type B) SLDL7500 magnetic flap level gauges. For side-mounted gauges, the switch is installed on the outer wall of the main cavity; for top-mounted gauges, it is fixed on the outer guide tube, matching the floating stroke of the internal magnetic head to ensure sensitive signal trigger.
High/Low Liquid Level Alarm Configuration Guide
The switch supports flexible customized high-level and low-level alarm settings, which can be matched with single or double switches to realize upper limit over-limit alarm and lower limit shortage alarm, and can be linked with pump start-stop and valve switch control.
1. Low Liquid Level Alarm Configuration
Install the reed switch at the preset low liquid level position of the level gauge. When the liquid level drops to the low threshold, the magnetic float moves to the switch position, the NO terminal closes and outputs a switching signal. The system triggers a low-level alarm to remind operators of liquid shortage and prevent equipment dry running. For interlock control, the signal can be linked to automatic liquid replenishment equipment.
2. High Liquid Level Alarm Configuration
Install another reed switch at the preset high liquid level position. When the liquid level rises to the upper limit threshold, the float magnet triggers the switch to close the circuit and output a signal. The system activates a high-level overflow alarm, and can interlock to stop feeding pumps or close inlet valves to prevent liquid overflow and equipment leakage risks.
3. Dual-Point Interlock Configuration
Equipped with both high and low level switches to form a closed-loop control system: the low-level signal triggers liquid replenishment, and the high-level signal stops feeding, realizing fully automatic constant liquid level control without manual intervention. All alarm thresholds can be freely adjusted according to on-site tank capacity and process requirements. Matched with SLDL7500 series high-precision gauges, the overall measurement accuracy reaches ±2.54mm, ensuring ultra-stable alarm trigger without false triggering or missed triggering.
FAQ (Frequently Asked Questions)
Q1: What media and environments is the magnetic level gauge switch applicable to?
This switch is perfectly compatible with SOLIDAT SLDL7500 series magnetic flap level gauges, applicable to non-magnetic liquid media with a density of 0.3–2.0g/cm³, and supports liquid interface measurement with a minimum density difference of 0.05S.G. It adapts to extreme working conditions of -40℃ to 427℃ and -1~207bar high pressure. The industrial-grade sealed structure resists high temperature, low temperature, humidity and dust. The optional explosion-proof Exd II CT6 model is suitable for flammable and explosive scenarios such as petrochemical and gas storage.
Q2: Will the switch cause measurement errors or wear after long-term operation?
No. The reed switch adopts fully sealed glass tube encapsulation with inert gas protection, featuring no mechanical friction and zero wear during operation. It relies on non-contact magnetic coupling induction without contacting liquid media. It effectively avoids failure caused by corrosion, scaling and mechanical fatigue, ensuring long-term stable and accurate signal output with a service life of more than 8 years under normal working conditions.
Q3: Can the alarm threshold position be adjusted after installation?
Yes. The switch is designed with a movable fixing clamp, which can slide freely up and down along the outer wall of the magnetic flap level gauge. Users can adjust the installation position of the switch according to actual process requirements to change the high/low level alarm threshold at any time. The fixing structure is firm and will not shift due to vibration or liquid fluctuation after positioning.
Q4: What control systems and equipment can the switch be connected to?
The standard SPDT switching signal output is widely compatible with industrial mainstream equipment, including PLC controllers, DCS systems, alarm buzzers, indicator lights, electromagnetic valves, and water/oil pump control cabinets. It supports both AC220V and DC24V working loops, no additional signal converter is required, realizing plug-and-play and simple on-site debugging.
Q5: How to deal with signal delay or no signal triggering failure?
First, check whether the switch installation position is aligned with the floating ball stroke range and whether the fixing is loose. Second, confirm that the on-site environment has no strong magnetic field interference (such as large motors and transformers). Finally, check whether the wiring terminals are loose or the cable is damaged. In most cases, repositioning the switch and eliminating magnetic interference can solve the problem effectively. In addition, ensure the measured medium density meets the 0.3S.G minimum standard of SLDL7500 gauge to avoid abnormal float operation causing signal failure.
Complete Technical Parameters & Matching Specifications
Matched Gauge Model: SOLIDAT SLDL7510 (Local indication type) / SLDL7520 (Remote transmission type)
Measuring Range: Standard 0.3~6m, maximum customizable up to 12m
Adaptable Medium Density: Liquid level minimum density 0.3S.G; interface minimum density difference 0.05S.G
Working Conditions: Process temperature -40℃ ~ 427℃; process pressure -1 ~ 207bar
Overall System Accuracy: ±2.54mm (matched with SLDL7500 series gauge)
Compatible Gauge Materials: 304/304LSS, 316/316LSS, 317SS, 321SS, 347SS, TA2 zirconium alloy, HC-276 Hastelloy, PTFE lining, CPVC, PP and other anti-corrosion materials, adapting to various corrosive media
Process Connection: Supports flange, short pipe and thread connection, consistent with SLDL7500 gauge installation standards
Conclusion
In conclusion, our Magnetic Level Gauge Switch is the ultimate supporting accessory for SOLIDAT SLDL7500 series MagDetect magnetic flap level gauges. It perfectly inherits the gauge's advantages of high temperature resistance, high pressure resistance, corrosion resistance and high precision, realizing integrated functions of on-site visual indication, high/low level automatic alarm and remote signal transmission. With non-contact magnetic induction operation, zero wear, cost-effectiveness and wide applicability, it greatly improves the safety, automation and stability of industrial liquid level monitoring. It is the ideal upgrade solution for petroleum, chemical, power, water treatment and other industrial process control systems. Order now and take advantage of the many benefits that our Magnetic Level Gauge Switch has to offer.
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