Description
The QSKP is a mechanical in-line paddle flow switch with a through-bore body in which body, process connection, connecting rod and paddle are all stainless steel. It is particularly suited to liquids and gases in industrial automation, machinery, air compression, refrigeration and air conditioning.
A spring-loaded paddle sits in the through bore; the flow deflects it and a linkage operates a microswitch. Setting range fixed by the model, twelve models from six bores DN15 to DN50 with two paddles A and B each, from 4.2 … 18 L/min to 50 … 150 L/min, fine setting by a knob. Repeatability ± 2.5 of the total range, without a per cent sign in the datasheet; an accuracy is not documented; hysteresis 2 … 8 L/min by model, measured with water at 20 °C. Output microswitch, normally open and normally closed, switching capacity 250 V AC, 3 A. Connection via screw terminals, numbered 3, 1 and 2 in the wiring diagram.
All four wetted parts in stainless steel, seal NBR, outer housing ABS. Process connection female thread R1/2, R3/4, R1, R1¼, R1½ or R2 at both ends. Pressure rating 16 bar, medium temperature 90 °C, ambient -25 … +120 °C, protection IP33. A declaration of conformity is not documented in the datasheet. Before sizing, note: For DN15 with paddle A the table gives 4.2 … 18 L/min, the same as DN20, and this has to be settled with an enquiry for DN15. The IP67 case shown in the photograph has no order field. The medium limit of 90 °C governs, not the higher ambient limit.
Advantages at a glance
- All wetted parts in stainless steel
- Twelve models from DN15 to DN50
- Switching point set by a knob
- Hysteresis documented for every model
- SPDT contact 250 V AC, 3 A
- Mechanical and electrical parts completely separated
- Four mounting positions permitted
- Same female thread at both ends