Description
The QSKJ is a mechanical in-line piston flow switch with a scale in L/min on the body. It is particularly suited to liquids and gases in industrial automation, machinery, air compression, refrigeration and air conditioning.
A magnetic piston on a spring is displaced by the flow, and the magnet closes a reed contact outside the wetted part. Setting range in four order fields: 0.6 … 8, 1 … 15, 2 … 25 and 27 … 70 L/min. Scale on the body 1 … 13 L/min, marked H2O 20 °C. Accuracy 5 % of the total range, hysteresis at least 0.6 L/min. Output dry reed contact, normally open, one or two switch points, switching capacity 24 V DC / 250 V AC, 100 mA. Supply 24 V DC ± 20 % or 230 V AC ± 15 % by order code, status LED on DC only. Connection M12, four pins.
Housing in POM (10 bar), anodised aluminium (50 bar) or stainless steel (100 bar), piston POM, spring stainless steel, seal NBR. Process connection female thread G1/4 to G1. Pressure loss 0.3 bar at 25 L/min, medium temperature ≤ 90 °C, protection IP67. A declaration of conformity is not documented in the datasheet. Before sizing, note: The parameter table gives 40 L/min as maximum flow for every model, including the 27 … 70 L/min range. The scale is valid for water at 20 °C only; for other media the switching point has to be checked against a known flow. The parameter table gives 50 bar for every model; the housing material decides, and the plastic version holds 10 bar.
Advantages at a glance
- Scale in L/min directly on the body
- Mechanical principle with reed contact outside the medium
- Accuracy 5 % of the total range
- Housing in POM, aluminium or stainless steel
- One or two switch points
- Supply 24 V DC or 230 V AC
- For liquids and gases
- Protection IP67