Hongnuo (shenyang) General Machinery Co., Ltd. is one of the most reliable manufacturers and suppliers of digital liquid level sensor in China. Welcome to buy high quality digital liquid level sensor at competitive price from our factory. We also accept customized orders.
HNL20-A vs HNL20-B – what's the difference?
| Feature | HNL20-A | HNL20-B |
|---|---|---|
| Output | 4-20mA only | 4 switch + 2 analog OR RS485 |
| Level measurement | Continuous | Continuous |
| Temperature | Not available | Yes – analog or switch output |
| Display | None | LED digital display |
| Output config | Fixed | PNP/NPN selectable, NO/NC switchable |
| Measuring range | Fixed when ordering | 0-2m adjustable in the field |
| Housing | 304 stainless steel | POM engineering plastic |
| Protection | IP65 | IP67 |
Need simple 4-20mA level signal? HNL20-A.
Need level + temperature + switch outputs + display? HNL20-B.
Specs at a glance
| Parameter | Value |
|---|---|
| Power supply | DC18–30V |
| Measuring range | 0–2m (field adjustable) |
| Measurement accuracy | 10mm (default) or 5mm |
| Level output | Switch + analog (configurable) |
| Temperature output | Switch + analog (configurable) |
| Switch outputs | Up to 4 (PNP/NPN, NO/NC selectable) |
| Analog outputs | Up to 2 (4-20mA / 0-20mA / 0-10V) |
Why Is HNL20-B Different?
|
Feature |
HNL10-A | HNL10-B | HNL20-A | HNL20-B |
|---|---|---|---|---|
| Level output | Switch (NO/NC) | Switch (NO/NC) | 4-20mA | Switch + Analog + RS485 |
| Temperature | No | Yes (switch/PT100/K) | No | Yes (switch + analog) |
| Number of outputs | 1 | 2 | 1 | Up to 6 (4 switch + 2 analog) |
| Output config | Fixed | Fixed | Fixed | PNP/NPN selectable, NO/NC switchable |
| Display | No | No | No | LED digital display |
| Range | Fixed | Fixed | Fixed | 0-2m field adjustable |
| Protection | - | IP65 | IP65 | IP67 |
| Mounting | Thread only | Thread/flange | Thread/flange | Thread only (flexible display rotation) |
One sensor does what used to take three.
- One mounting hole
- Two measurements (level + temperature)
- Up to six outputs (4 switches + 2 analogs)
- One display for local reading
- One cable to your PLC
Where to use it
Hydraulic power units
Level + oil temperature monitoring from one installation point. Switch outputs for low-level and over-temp alarms. Analog outputs for continuous reading on control panel display.
Machine tool coolant tanks
Coolant level monitoring + temperature alarm. One sensor replaces two separate instruments. Saves tank openings, saves installation time.
Lube oil reservoirs
Continuous level + oil temperature for predictive maintenance. RS485 output connects directly to PLC. Track trends – catch problems before they cause downtime.
Chemical mixing vessels
Level + temperature in agitation tanks. Multiple switch outputs for high-high/low-low level alarms. Analog outputs for process control loop.
Wastewater sumps
Submersible level monitoring. IP67 rated. 4-20mA output to SCADA, switch output to pump starter. One sensor does both.
Level + temperature. One sensor. Up to 4 switch + 2 analog outputs. Fill in your tank depth, media type, and control requirements – we will configure and quote the right model.
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HNL20-B Integrated Liquid Level and Temperature Sensor Parameters |
|
|
Specific Parameters |
Value / Description |
|
Measurement Principle |
The HNL20-B integrated level/temperature sensor can output multiple signals simultaneously, meeting the monitoring needs of different locations for level and temperature. It also reduces the number of openings in the user's enclosure, and its simplified, miniaturized design and aesthetically pleasing appearance allow for flexible installation to meet different equipment upgrade requirements. |
|
Product Type |
Liquid level sensor |
|
Float Type |
NBR float (for oil), 304 float (for water) |
|
Measurement Range |
0-1000mm, Customization |
|
Measurement Accuracy |
±5mm, Customization |
|
Outputs |
4-20mA, 1-5V, RS485 |
|
Power Supply |
24VDC |
|
Operating Temperature |
-20-80℃ |
|
Material |
304 Stainless steel |
|
Process Connection |
Threaded, Flange |
|
Electrical Connection |
M12 Connector |
|
Protection Level |
IP67 |
|
Certificate |
CE certified |
