The gas flow rate is measured by high quality laminar mass flow sensor tubes and is displayed on a digital display. The mass flow cell has a very low pressure drop (less than 1 cm of H2O) and a linearity error of less than ±3 % reading (which is much better than the precision expressed as a percentage of full scale used by some manufacturers). The repeatability is better than ±0.5 % per reading. The gas flow rate is regulated by a specially developed proportional needle valve controlled by a microprocessor.
The MASSFLOW gas flow controller can be operated manually with the buttons on the front panel or using remote control. The analogical remote control includes ON/OFF and 0 to 10 V full-scale control of the flow rate. A fully digital control uses RS485 connection.
Programming
Up to 50 pairs of flow rates and times can be programmed. This allows the flow to be switched on and off or the setting of any flow rate for a desired time interval.
Gas volume totaliser
The MASSFLOW gas flow controller generates impulsions after every 5 ml of gas flow. These impulsions can be totaled by a Flow Integrator (cat.no: 4803), measured as a voltage, recorded on a recorder or on a PC (fermentation program FNet). In this way exact volume information can be obtained.
Zero setting
The MASSFLOW gas flow cotroller is equipped with an automatic zero setting which further improves the precision of the gas flow rate reading.
Specifications:
| Gas Flow rates: | 0—5.0 l/min |
|---|---|
| Calibration: | nitrogen/air |
| Accuracy: | ±3 % reading or one digit |
| Repeatability: | ±0.5 % reading or one digit |
| Operating ambience: | 0 to 40 °C |
| Maximum system pressure: | 0.2 MPa |
| Dimensions (not including fitting): | 105 × 80 × 170 mm |
| Weight: | 800 g |
| Connections: | 8 pole cable with two DIN connectors |
| Power supply: | primary 100—240 V / 50—60Hz secondary +12 V / 6 W |