Description
The QGKJ is a thermal MEMS mass flowmeter for gas with G3/8 thread connection and stainless steel or aluminium body. It is particularly suited to clean, relatively dry gases up to 200 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 20, 50, 100 or 200 slpm. Accuracy ± 1.5 % F.S., response time 20 ms. Outputs 1 … 5 V or 4 … 20 mA in a three-wire circuit and digital I²C, this series has no RS485. Supply 8 … 24 V DC, 50 mA. Connection via five leads: SCL, GND, Vin, Vout, SDA. Display module optional in the order code. Calibration with air at 0 °C and 101.325 kPa.
Body of stainless steel or aluminium alloy, selected in the order code. Process connection G3/8, 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 customizable or optional, no standard version is stated. The reference state is given twice and differently, 0 °C and 20 °C at 101.325 kPa. 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 I²C
- Thread connection G3/8, stainless steel or aluminium
- Shock resistant up to 100 g
- Display module optional