SISCO ultrasonic level switch provides precision presence/absence sensing for opaque or transparent targets. Its ultrasonic level sensor uses advanced signal processing to ignore acoustic interference, while the NPN switching output ensures easy integration. The robust stainless-steel design guarantees long-term reliability in demanding environments without contact with the measured medium.
Dual-Mode Detection and Flexible Control
- This ultrasonic level switch offers two operating modes and straightforward field adjustments to match various point-level applications.
- Set a single detection threshold anywhere within the 5-500 mm range; when the target arrives, the NPN output changes state immediately.
- Define two separate distance limits to create a window zone – the output stays active for any object between these two points.
- An adjustable hysteresis (deadband) is available to eliminate output chatter when the measured level fluctuates near the switching boundaries.
- Switch between normally open and normally closed logic by simple wiring, and use the push-button with a bi-colour LED for quick on-site teaching and status verification.
High-Precision Measurement and Stable Output
- Achieve 0.5mm resolution and 0.3% repeatability of full scale, capturing even minor level changes with confidence.
- Built-in temperature compensation automatically corrects for sound-speed drift caused by ambient thermal variations, keeping readings stable across the operating range.
- Non-contact sensing eliminates mechanical wear and prevents contamination, making the sensor suitable for corrosive, sticky, or opaque media.
- The rugged 304 stainless-steel housing (M18, IP65) withstands harsh industrial environments, while optional analog outputs (4-20mA / 0-10V) or RS485 communication enable easy integration with PLCs.
Applications
SISCO ultrasonic level switch with NPN output and 5- 500 mm range is widely used for liquid level control, tank overfill prevention, pump dry-run protection, and presence/absence detection in automated industrial systems.
Liquid Level Detection
Machine Level Monitoring
Tank Overflow Prevention
Wastewater Collection
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| Model | SISCO-LS-M18Q-N |
| Detection Range | 5- 500 mm |
| Range of Regulation | 5- 500 mm |
| Dead Zone | 0- 5 mm |
| Standard Test Board | 100×100mm |
| Angle Sensor | 7° |
| Frequency | Approximately 200kHz |
| Response Delay | 50ms |
| Operating Voltage | 10~30V DC, 10% VPP |
| Protection Circuit | Anti-reverse Protection, Instantaneous Overvoltage Protection |
| No-Load Current | ≤25mA |
| Load | Voltage Output:> 1 kΩ |
| Output Mode | Switching Output (NPN, NO/NC Selectable) |
| Resolution | 0.5mm |
| Repeatability | 0.3% Full Scale |
| Temperature Drift | ≤2% of Full Scale (Built-in Temperature Compensation) |
| Linearity | <1% |
| Operating Temperature | -20°C ~ +45°C |
| Storage Temperature | -20°C ~ +50°C |
| Electromagnetic Compatibility | GB/T 17626.2-2006, GB/T 17626.4-2008 |
| Class of Protection | IP65 |
| Housing Material | 304 Stainless Steel |
| Line Length | 2m PVC Oil-resistant Composite Cable |
Dimensions (unit: mm)
Wiring Method
Packing List
- 1× SensorÂ
- 1× Mounting Bracket (Stainless Steel)
- 2× Installation Screws
Q1: Can the detection range of this ultrasonic level switch be adjusted within the 5- 500 mm span?
A1: Yes. This ultrasonic level switch allows you to set any detection point within the 5- 500 mm range via the push-button. You can choose single-point or two-point window mode for flexible level control.
Q2: How do I connect the NPN output of this ultrasonic level switch to my PLC?
A2: The NPN switching output sinks current to ground when activated. Connect the blue wire to DC-, the black wire to your PLC input, and the brown wire to DC+ (10- 30V DC). The output can be set to normally open or normally closed by wiring.
Q3: Does temperature affect this 5-500mm ultrasonic level switch?
A3: No. The sensor features built?in temperature compensation that automatically corrects for sound-speed drift caused by ambient temperature variations. This ensures stable and reliable detection across the full operating temperature range.
Tips: How to set up this 5-500mm ultrasonic level switch?
- One-button teach-in allows instant distance setting within the 5- 500 mm range – simply place the target at the desired position and press the S key for 3 seconds.
- Dual-mode flexibility supports both single-point and two-point window settings, adapting to various level monitoring needs without external software.
- Bi-colour LED indicator provides real-time feedback during setup, showing teaching progress and confirming successful configuration.
- NPN output with field-selectable NO/NC logic eliminates the need for additional relay modules, simplifying wiring and integration.
- Built-in temperature compensation ensures the configured detection point remains stable across ambient temperature changes, reducing recalibration frequency.
Thank you for buying industrial test and measurement equipment on SISCO.com, all products sold by SISCO and the partner cover a 12 months warranty, effective from the date of receiving the products.
What is covered?
SISCO is responsible for providing free spare parts, and free technical support to assist the customer to repair the defective products until the problem is solved.
What is not covered?
- Product purchased from anyone other than a SISCO store or a SISCO authorized reseller.
- Expendable parts.
- Routine cleaning or normal cosmetic and mechanical wear.
- Damage from misuse, abuse or neglect.
- Damage from use of parts other than SISCO approved.
- Damage from use outside the product’s usage or storage parameters.
- Damage from use of parts not sold by SISCO.
- Damage from modification or incorporation into other products.
- Damage from repair or replacement of warranted parts by a service provider other than a SISCO authorized service provider.
- Damage caused by the application environment not meeting the product usage requirements and the failure to perform preventive maintenance.
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