Description
The QGKE is a thermal flow sensor for gas with a colour display that turns by 180° and two switch outputs. It is particularly suited to dry air and nitrogen where instantaneous value, total and limits are needed on the device.
Thermal mass flow measurement, the gas stream carries heat away from the heated sensor, one flow direction. Rated flow 2 … 500, 5 … 1000 or 10 … 2000 L/min by size. Display accuracy ± 3 % F.S. ± 1 digit, analogue accuracy ± 5 % F.S., repeatability ± 1 % F.S. ± 1 digit, response time ≤ 100 ms. Outputs: two open-collector switch outputs, NPN or PNP, 125 mA maximum, short-circuit protected, with differential, window, cumulative flow and cumulative pulse modes, plus 1 … 5 V, 4 … 20 mA or RS485. Supply 12 … 24 V DC ± 10 %, ≤ 50 mA. Connection via six-core PVC cable Ø 4 mm.
Plastic housing, process connection Rc1/2, G1/2, Rc3/4, G3/4, G1, R1 or G1-1/2 by size. Working pressure 0 … 1.0 MPa, pressure resistance 1.5 MPa. Medium and ambient temperature 0 … +50 °C without dew or ice. Protection grade IP40. The EMC standards IEC 61000-6-2 and IEC 61000-6-4 are named; a declaration of conformity is not documented in the datasheet. Before sizing, note: the 3000 and 6000 L/min sizes appear only in the order code and the dimension drawings, no technical data exist for them. Whether NPN or PNP applies cannot be read unambiguously from the datasheet. The core assignment changes with the output version, so a cable does not fit every version.
Advantages at a glance
- Colour display, turns by 180°
- Shows instantaneous flow, total and percentage of range
- Two switch outputs with window, differential and cumulative modes
- Analogue 1 … 5 V or 4 … 20 mA, alternatively RS485
- Repeatability ± 1 % F.S. ± 1 digit
- Working pressure up to 1.0 MPa, pressure resistance 1.5 MPa
- EMC to IEC 61000-6-2 and IEC 61000-6-4