Description
The QGKC is a thermal MEMS mass flowmeter for small gas flows with a four-digit LED display, in the bores DN3 and DN8. It is particularly suited to clean, dry gases where the mass flow is to be measured directly without temperature or pressure compensation; it is calibrated for one gas chosen in the order code.
Thermal MEMS chip, the gas carries heat away from the sensor, which gives the mass flow directly. Full scale 2, 3, 4 or 5 SLPM on DN3 and 10 … 50 SLPM on DN8, turndown 100:1. Accuracy ± (1.5 + 0.2 F.S.) %, read as 1.5 % of reading plus 0.2 % of full scale, repeatability 0.25 %, response time 10 ms. Outputs RS485 or RS232 and linear 0.5 … 4.5 V. Supply 8 … 24 V DC, 50 mA. Connection via five-pin socket.
Process connection BSPT 1/4 (R1/4) or, on DN3, a 4, 6 or 8 mm push-in fitting. Working pressure 0.5 MPa maximum, pressure loss at full scale 100 Pa (DN3) or 600 Pa (DN8). Operating temperature -10 … +55 °C, humidity below 95 % RH without icing or condensation. Body material, protection grade and explosion protection are not stated. A declaration of conformity is not documented in the datasheet. Before sizing, note: the 50 SLPM full scale is in the parameter table but has no order code. For oxygen and hydrogen there is no statement on suitability or ignition protection. Pin assignment and mating connector of the socket are not documented.
Advantages at a glance
- Direct mass flow measurement without temperature or pressure compensation
- Turndown 100:1
- Repeatability 0.25 %
- Response time 10 ms, 20 … 1000 ms on request
- Four-digit LED display for instantaneous and totalized flow
- RS485 or RS232 plus analogue output 0.5 … 4.5 V
- Highest and lowest value since power-up recorded
- Calibration for one of seven gases selectable
- Compact, 55 … 77 g