Description
The QSKC is a calorimetric flow switch with probe and housing in stainless steel and no moving parts in the medium. It is particularly suited to water, cutting fluid, lubricating oil and air, to pump dry-running protection and to low-flow alarms.
A heated and an unheated resistor in the probe sense the flow velocity. Setting range: 1 … 150 cm/s water, 3 … 300 cm/s oil, 20 … 2000 cm/s air, by potentiometer. Accuracy and repeatability of the switching point are not documented. Output PNP, NPN or relay (SPDT), switching current ≤ 400 mA or ≤ 4 A (relay). Supply 24 V DC ± 20 %, no-load current ≤ 80 mA, response time 1 … 13 s, typically 2 s. Connection via side-mounted M12 × 1 plug or 2 m of cable.
Probe and housing in stainless steel, weight 0.4 kg. Process connection G1/2, G1/4, R1/2 or R1/4 male or M18 × 1.5 female. Pressure rating 100 bar, medium temperature -20 … +80 °C, protection IP67. A declaration of conformity is not documented in the datasheet. Before sizing, note: The setting range is a flow velocity; the flow rate depends on the pipe bore. Data block and order code disagree on the supply; only 24 V DC can be ordered, and a 230 V AC version has to be confirmed first. The pressure of the installed assembly is set by the accessory; the conventional stainless tee is rated 40 bar.
Advantages at a glance
- Housing and probe entirely in stainless steel
- Calorimetric principle with no moving parts
- Settable for water, oil and air
- Output PNP, NPN or SPDT relay
- Pressure rating 100 bar at the switch
- Protection IP67
- LED row with six LEDs for switching state and velocity trend