Hongnuo (shenyang) General Machinery Co., Ltd. is one of the most reliable manufacturers and suppliers of magnetic float level sensor in China. Welcome to buy high quality magnetic float level sensor at competitive price from our factory. We also accept customized orders.
Parameter Overview
| Parameter | Value |
|---|---|
| Power supply | DC16–30V |
| Output | 4-20mA (analog) |
| Load | ≤500Ω (at 4-20mA) |
| Measurement accuracy | ±5mm |
| Long-term drift | ±5mm |
| Measuring range | 150 / 200 / 250 / 350 / 500 / 750 / 1000mm (selectable) |
More details please check "Specifications".
Level switch vs Level sensor – what's the difference?
| Feature | HNL10-A (Level Switch) | HNL20-A (Level Sensor) |
|---|---|---|
| Output | On/off switch (NO/NC) | 4-20mA analog (continuous) |
| What you know | "Level is high" or "Level is low" | "Level is at XX mm" – exact position |
| PLC input needed | Digital input | Analog input (4-20mA) |
| Accuracy | - | ±5mm |
| Remote monitoring | No – just local switching | Yes – wire it to a panel meter, PLC, or SCADA |
| Best for | Alarm only | Continuous monitoring, pump control, inventory tracking |
Just need an alarm when the tank is full or empty? Use HNL10-A.
Need to know the exact level at all times? Use HNL20-A.
Key features
1. Continuous measurement, not point-only
Know exactly where the liquid level is at any moment. 4-20mA output gives you real-time data for control or display.
2. Two float options
| Float | Material | Best for |
|---|---|---|
| NBR | NBR rubber | Oil, hydraulic fluid, lubricants |
| 304 | Stainless steel | Water, mild chemicals |
3. Level-only or level + temperature
Option 1: 4-20mA = level only.
Option 2: 4-20mA for level + an additional output for temperature. Two measurements, one sensor.
Where to use it
Machine tool oil tanks
Hydraulic oil level monitoring. 4-20mA to PLC or panel meter. Know when oil is low before the pump sucks air. NBR float for oil compatibility.
Hydraulic power units
Continuous level monitoring on hydraulic reservoirs. Float follows oil level at all times. No more daily dipstick checks – read it from the control room.
Pump stations / water tanks
Water level monitoring for pump control or SCADA. 304 stainless float for clean water applications. 4-20mA signal gives you actual level, not just high/low alarms.
4-20mA level sensor for continuous tank monitoring. Float options: NBR for oil, 304 for water. Range up to 1000mm. Tell us your tank size and media – we will quote the right model.
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HNL20-A Liquid Level and Temperature Integrated Sensor Parameters |
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Specific Parameters |
Value / Description |
|
Measurement Principle |
The HNL20-A level/temperature integrated sensor incorporates a Hall effect magnetic sensor, while an external magnetic float monitors the liquid level as it rises or falls. It can continuously measure the liquid level and is available with either an NBR oil-based float or a stainless steel float, making it suitable for various media. |
|
Product Type |
Liquid level sensor |
|
Float Type |
NBR float (for oil) |
|
Measurement Range |
0-1000mm, Customization |
|
Measurement Accuracy |
±5mm, Customization |
|
Outputs |
4-20mA,1-5V |
|
Power Supply |
24VDC |
|
Operating Temperature |
-20-80℃ |
|
Material |
304 Stainless steel |
|
Process Connection |
Threaded, Flange |
|
Electrical Connection |
Hessmann, M12 Connector |
|
Protection Level |
IP67 |
|
Certificate |
CE certified |
