Description
The QGKH is a thermal MEMS mass flowmeter for gas with R3/4 thread connection and stainless steel body. It is particularly suited to clean, relatively dry gases up to 1000 slpm; it is calibrated for one gas chosen in the order code.
Thermal MEMS chip as a solid-state sensing element without thin membrane; the mass flow is measured directly, no temperature or pressure compensation is needed. Full scales 300, 500, 600, 800 or 1000 slpm. Accuracy ± 1.5 % F.S., response time 20 ms. Outputs 1 … 5 V or 4 … 20 mA in a three-wire circuit and RS485 with Modbus or I²C. Supply 8 … 24 V DC, 50 mA. Connection via M12 × 1 connector. OLED display with two of the output versions only. Calibration with air at 0 °C and 101.325 kPa.
Body of stainless steel, aluminium alloy on request. Process connection R3/4, working pressure 0.8 MPa maximum. Medium temperature -10 … +65 °C, ambient temperature -25 … +85 °C, humidity 0 … 100 % RH. Protection grade IP40. Explosion protection is not documented. A declaration of conformity is not documented in the datasheet. Before sizing, note: flow range, maximum pressure, process connection and response time are marked customized or optional, no standard version is stated. The flow figures are standard litres at 0 °C, while the order code writes L/min without a reference. For oxygen and hydrogen there is no statement on suitability or ignition protection.
Advantages at a glance
- Direct mass flow measurement without temperature or pressure compensation
- Solid-state sensor without membrane, resists clogging and pressure shock
- Withstands condensation, humidity 0 … 100 % RH
- Response time 20 ms
- Analogue 1 … 5 V or 4 … 20 mA, digital RS485 Modbus or I²C
- Thread connection R3/4, stainless steel
- Shock resistant up to 100 g
- M12 × 1 connector