In potentially explosive atmospheres, the monitoring of air flows is of great importance. For this purpose we have developed the flow monitors NLSW®45-3 Ex and NLSW®75-A Ex certified in combination with the F3.x Ex probes. Both devices meet the requirements for air monitoring in ATEX zones 2 and 1.
Depending on the output signal requirement, either a flow monitor (NLSW®45-3 Ex) or a flow meter with relative analog output (0-10 V, 4-20 mA) and relay output (NLSW®75-A Ex) is used.
The evaluation unit and the Zener barriers included in the scope of delivery are installed outside the hazardous area. The sensors are mounted inside the hazardous area and have a standard cable length of 2.5 m. On request, the cable at the sensor can be extended up to 30 m.