Description
The QSKQ is a mechanical in-line paddle flow switch with wetted parts and terminal enclosure in stainless steel for sizes DN20 to DN40. It is particularly suited to liquids and gases in industrial automation, machinery, cooling, fire protection and petrochemicals.
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, eight models from four bores with two paddles A and B each, from 4.2 … 18 L/min to 25 … 111 L/min, fine setting by a knob. Repeatability ± 2.5 % of the total range; an accuracy is not documented; hysteresis 2 … 7 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.
Body, process connection, connecting rod and paddle in stainless steel, terminal enclosure in stainless steel. Process connection taper thread R3/4, R1, R1¼ or R1½ at both ends. Pressure rating 100 bar, pressure loss 0.08 bar at maximum flow, medium temperature 250 °C, protection IP67. An Ex marking is not given in the datasheet. A declaration of conformity is not documented in the datasheet. Before sizing, note: Type of protection, temperature class and certificate are not documented, so explosion protection is not substantiated. An ambient temperature is not documented. Neither a thread size nor a gland is given for the cable entry.
Advantages at a glance
- Wetted parts and enclosure in stainless steel
- Pressure rating 100 bar
- Medium temperature up to 250 °C
- Protection IP67
- Repeatability ± 2.5 % of the total range
- Switching point set by a knob
- SPDT contact 250 V AC, 3 A
- Low pressure loss 0.08 bar
- Four mounting positions permitted