Product Guarantees FAQ
Introduction
Designed with magnetically actuated reed contacts, this multi-point float level switch offers 1~4 switch channels and dual NO/NC contact modes, enabling multi-position threshold control for liquid media. The contact load is rated at maximum 230V AC 70VA and DC 50W, with dedicated 24VDC 150mA parameters for explosion-proof variants.
The device supports a medium density threshold of ρ≥0.5 g/cm³. Users can select standard Φ19 guide tube & Φ75 float or customized smaller Φ14 guide tube / Φ52 float; the maximum overall length can extend to 3000 mm. Wetted components support a full range of anti-corrosion materials from stainless steel and titanium to plastic PVDF/PTFE, adapting to diverse chemical working conditions.
With a wide ambient temperature range of -30 ℃ to 75 ℃ and process pressure up to 4.0 MPa, the IP65 coated cast aluminum housing guarantees stable outdoor and indoor installation. Multiple process connection forms including flange, thread and bracket are reserved. Optional Ex d II C T4~T6Gb explosion-proof certification allows installation in flammable and explosive process areas, widely applied for fixed-point level interlock and alarm control of industrial storage vessels.
Technical Data
Below lists full specifications of this reed contact multi-point level switch, covering electrical parameters, dimension options, material selection, pressure & temperature ratings and installation forms for model selection reference.
| Item | Specifications |
|
Principle |
Magnetically controlled reed contacts |
|
Switches |
1...4 |
|
Switch status |
Normal open (NO), Normal closed (NC) |
|
Float action |
Upward control, Downward control |
|
Contact capacity |
Max.230V AC70VA, DC50W (for EX-proof 24VDC 150mA) |
|
Medium density |
ρ≥0.5g/cm³ |
|
Process temperature |
Max.120℃ |
|
Process pressure |
0...4.0MPa (Depending on mounting type and float-type, material) |
|
Wetted material |
304, 316L, Titanium, PVC, PP, PVDF/PTFE |
|
L max. |
3000mm |
|
IP code |
IP65 |
|
Housing material |
Cast aluminium (coated) |
|
Process connection |
Flange, Thread, Bracket |
|
Ambient temperature |
-30...75℃ |
|
Guide tube |
Φ 19mm standard (optional Φ 14mm) |
|
Float |
Φ 75mm standard (optional Φ 52mm) |
|
Electrical connection |
M20*1.5F (standard) 1/2NPT-F 3/4NPT-F |
|
Explosion-proof |
Exdb II CT4...T6Gb (optional) |
Features
This multi-point level switch adopts mature magnetic reed contact working principle, delivering stable and repeatable liquid level detection for industrial tank systems. With simple mechanical structure and no complex electronic circuits, it effectively avoids signal interference and ensures long-term reliable operation under diversified working conditions.
- Multi-point Adjustable Control
Supporting 1 to 4 switch points configuration and optional NO/NC contact modes, this single unit realizes multi-position liquid level alarm and interlock control. It supports both upward and downward level detection, fully meeting high-low level protection, pump start-stop and overflow prevention requirements.
- Superior Anti-interference & Load Resistance
Different from ordinary mechanical and electronic level switches, the reed contact structure features fast response, longer service life and strong load impact resistance. With stable contact capacity up to 230V AC 70VA / DC 50W (24VDC 150mA for explosion-proof type), it adapts to various industrial control circuits without signal drift.
- Wide Compatibility for Diverse Working Conditions
It works stably within -30℃~75℃ ambient temperature, 0~4.0MPa pressure and up to 120℃ medium temperature, suitable for liquid media with density ≥0.5g/cm³. Multiple wetted material options including 304, 316L, Titanium, PVC, PP and PVDF/PTFE cover common corrosive and non-corrosive fluids.
- Flexible Customization & Installation
Standard and optional sizes are available (Φ14/Φ19 guide tube, Φ52/Φ75 float), with a maximum measuring length of 3000mm. Flange, thread and bracket connection methods support flexible installation for various tank structures.
- Durable & Explosion-proof Optional Design
Equipped with coated cast aluminum housing and IP65 protection grade, the switch resists dust and moisture. Optional Ex db II C T4~T6Gb explosion-proof certification enables safe deployment in hazardous flammable and explosive industrial areas.
- Maintenance-free Operation
Featuring purely mechanical magnetic induction detection with no wearable electronic components, it requires no routine maintenance, greatly reducing on-site operation costs and downtime risks.
Product Applications
Multiple magnetic reed switches are mounted inside a non-magnetic guide tube. Hollow floats with built-in permanent magnets slide along the tube and move up and down with liquid buoyancy.
When the float approaches a reed switch, magnetic force closes the contacts and outputs an ON signal. As the float moves away, the contacts open to send an OFF signal. This structure enables multi-point switch output for level alarm and remote control.
Equipped with multi-point switch outputs, optional explosion-proof structure and multiple anti-corrosion materials, this level switch serves limit alarm and pump interlock control in the following scenarios:
- LNG storage tanks: Multi-point level monitoring + overflow & dry-pump protection for hazardous zones
- Pharma & food workshops: Sanitary material options for feeding pump automatic control and overflow prevention
- Sluices & reservoirs: Water level threshold signals to automate gate opening/closing
- Water & sewage plants: Auto start-stop of water pumps for clean water and sewage pools
- Chemical workshops: Corrosion-resistant wetted parts for reactor tank level interlock
- Oil depots: High/low level safety interlock for oil storage tanks
- General industrial tanks: Customizable multi-point limit protection for conventional liquid vessels
Product Guarantees
We adhere to strict manufacturing standards and full-range quality inspection for all multi-point level switches. Each product is fully tested for contact stability, pressure resistance, tightness and electrical performance before shipment, and optional explosion-proof versions pass extra safety verification to ensure reliable operation in flammable environments.
We use a wide range of high-grade corrosion-resistant materials for wetted components to adapt to various industrial liquids, while the cast aluminium housing with IP65 protection works steadily under complex ambient conditions. Featuring a purely mechanical magnetic reed structure, this switch has outstanding load impact resistance and long service life, maintaining consistent performance for multi-point level control tasks.
A 12-month warranty is provided against manufacturing defects, covering free repair and replacement for qualified faulty products. In addition, our team offers professional remote technical support for product selection, installation and daily operation for all customers.
FAQ
Q1: What working principle does this multi-point level switch adopt?
A1: It relies on magnetic induction between float-mounted permanent magnets and internal reed switches inside the non-magnetic guide tube. The float rises and falls with liquid buoyancy, triggering contact on/off actions to output discrete switch signals for level alarm and interlock control.
Q2: How many level switch points can be customized on one unit? Are NO and NC contacts available?
A2: A single switch supports 1 to 4 independent detection points, with both normally open (NO) and normally closed (NC) contact modes optional. Upward or downward trigger control can be set on demand to match high/low level protection logic.
Q3: Is there a minimum requirement for measured liquid density?
A3: The applicable medium density is ρ≥0.5 g/cm³. Liquids with insufficient density cannot lift the float normally and will lead to abnormal detection.
Q4: What wetted material options are available to cope with corrosive media?
A4: Wetted components support 304, 316L, Titanium, PVC, PP, PVDF and PTFE multiple materials, covering ordinary water, weak acid, weak alkali and various chemical corrosive liquids.
Q5: Does this level switch support explosion-proof installation in hazardous areas?
A5: The standard version is non-explosion-proof; an optional Ex db II CT4~T6Gb explosion-proof model is supplied, specially designed for flammable and explosive storage tanks and chemical workshop sites.
Q6: What are the optional sizes for guide tube and float? What is the maximum insertion length?
A6: Standard guide tube Φ19mm / float Φ75mm, alternatively Φ14mm guide tube and Φ52mm float are available. The maximum overall effective length L can reach 3000mm, meeting deep tank installation needs.
Q7: What is the rated contact load of the reed switch?
A7: Max. 230V AC 70VA, DC 50W for standard type; the explosion-proof variant adopts dedicated 24VDC 150mA contact parameters to match intrinsic safety requirements.
Q8: Does this float level switch require regular on-site maintenance?
A8: It adopts fully mechanical magnetic trigger structure with no internal electronic components prone to wear. No routine maintenance is needed after installation, effectively reducing long-term operation costs.
Q9: What installation connection modes can I choose?
A9: Flange, thread and bracket three installation forms are optional, compatible with vertical mounting on various storage tanks, reaction kettles and water pools.
Q10: What warranty and technical support can you provide?
A10: We provide a 12-month limited warranty starting from delivery date; free repair or replacement will be offered for faults caused by manufacturing defects. We supply exclusive remote technical guidance for model selection, installation and wiring debugging throughout the whole service cycle.
Share your working conditions and requirements, and we will offer professional solutions.
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