SQ4 series safety leak sensors detect leaks and thereby curb danger resulting from them. The two-part design, consisting of the sensor and the mounting bracket, simplifies installation. The sensor itself incorporates two-stage detection: a detection unit at the front of the sensor issues a warning if it comes into contact with liquid, whereas if the detection unit in the center of the sensor becomes immersed, the leak is considered critical and the sensor initiates an emergency stop.
SQ4 series safety leak sensors detect leaks and thereby curb danger resulting from them. The two-part design, consisting of the sensor and the mounting bracket, simplifies installation. The sensor itself incorporates two-stage detection: a detection unit at the front of the sensor issues a warning if it comes into contact with liquid, whereas if the detection unit in the center of the sensor becomes immersed, the leak is considered critical and the sensor initiates an emergency stop. To provide utmost flexibility, a chemically resistant version is also available. Up to 4 safety liquid leak sensors can be connected to the SQ4-C11 controller.
Characteristics:
Accessories:
| Type | Water | Liquids | |
|---|---|---|---|
| Part no. | NPN | SQ4-A21-N | SQ4-A22-N |
| PNP | SQ4-A21-P | SQ4-A22-P | |
| Sensor type | Leakage sensor | ||
| Safety category | Category 1, PLc, SIL1 (with SQ4C11 controller: category 4, Ple, SIL3) | ||
| Tolerable liquids | Water | Sulfuric acid, ammonia, Galden, Fluorinert, fluorine, etc. | |
| Supply voltage | 12 to 24V DC ±10% | ||
| Output | PNP / NPN transistor, max. 50mA | ||
| Response time | 10ms | ||
| Emitting element | Infrared LED | ||
| Degree of protection | IP65/IP67 (IEC) | ||
| Rated current consumption | Max. 30mA | ||
| Ambient temperature | -10 to +55°C | ||
| Material | Polypropylene | PFA | |
| Dimensions (ØxH) | 35.8 x 18.7mm | ||
| Connection method | Cable: 2m | ||
| Weight | 45g | ||
| Part no. | SQ4-C11 |
|---|---|
| Sensor type | Controller |
| Safety category | Category 4, PLe, SIL3 |
| Response time | Max. 20ms (limited by the sensor) |
| Supply voltage | 24V DC +10/-15% |
| Control outputs | OSSD1 and OSSD2 (2x PNP or 2x NPN transistor, switchable), max. 200mA |
| Functions | Interlock, lockout, cancel test / external monitoring, safety input, etc. |
| Rated current consumption | Max. 200mA |
| Degree of protection | IP20 (IEC) |
| Ambient temperature | -10 to +55°C |
| Material | PC / ABS |
| Connection method | Connector (sensors), terminal block |
| Dimensions (HxWxD) | 100 x 48 x 66mm |
| Weight | 170g |
 |
| Leakage monitoring during wafer production |
