Product Introduction
1. Overview of POS Liquid Level Sensors
POS liquid level sensors provide single-point liquid level detection with NPN or PNP output signals. When the sensor output is off, the output can sink or source up to 200mA, directly driving incandescent indicator lights, audible alarms, relays, etc.Both normally open (n.o.) and normally closed (n.c.) versions are available with M12 thread and cable connection methods.
2. Cleaning Methods for POS Liquid Level Sensors
Choose different cleaning solutions based on the contaminants. The original manufacturer recommends using Freon and alcohol solvents.
Chlorine-based solvents such as trichloroethane are prohibited as they can damage the sensor materials.
3. Compatibility of POS Liquid Level Sensors with Liquid Media
Before use, check whether the target liquid is compatible with Simax crystal glass material.
4. Electrical and Environmental Characteristics of POS Liquid Level Sensors
| Sensor Series | POS187 | POS287 |
| Supply Voltage (Vs) | 12 to 28Vdc | |
| Supply Current (Is) | < 25mA | |
| Output Sink/Source Current (Io) | 200mA | |
| Operating and Storage Temperature | -25 to 100 | -40 to 140 |
| (Media Temperature) | (Media Temperature) | |
| Protection Standard | IP68 (cable version) / IP67 (connector version) | |
5. Mechanical Structure of POS Liquid Level Sensors
| Sensor Series | POS187 | POS287 |
| Cable Type (POSXXX-3XX) | PUR 3 x 0.25mm2, 2m length | |
| Cable Type (POSXXX-4XX) | M12 Connector | |
| Dimensions | See dimension drawing | |
| Thread | G1/2” | |
| Material | . Stainless steel housing / Simax crystal glass sensing element | |
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