Insertion flow meter for compressed air and gases — VA 420
Спецификация VA 420
Available on request
Delivery across Russia
Order phone: +7(800)777-18-50
Description
The VA 420 insertion flow meters use a proven thermal anemometric measurement principle. The heated sensor is cooled by the airflow passing by it. The degree of cooling, which serves as an indicator of flow, directly depends on the mass of the passing gas. For this reason, no additional measurement of temperature and pressure is required. The compact design of the sensor allows it to be used for monitoring any compressed air systems: from compressors to very small devices (diameters from 1/4 to 2 inches). For diameters larger than DN50, it is better to use VA 400 sensors. In addition to compressed air, the VA 420 flow meter can also measure the flow of other gases such as nitrogen, oxygen, CO2, etc. The sensor installation can be done quickly and without special effort. A separate advantage is the removable measuring part. It can be easily dismantled for calibration or cleaning without removing the entire insertion section.
Advantages
- Simple installation;
- Choice of measurement units: m³/h, m³/min, l/min, l/s, kg/h, kg/min, kg/s, cfm;
- Compressed air counter up to 1,999,999,999 m³, resettable from the display;
- Analog output 4...20 mA, pulse output (galvanically isolated);
- High measurement accuracy, including at low flow rates (ideal for leak detection);
- Negligible pressure loss;
- Thermal anemometric measurement principle, no additional pressure and temperature measurement required, no moving parts;
- Gas type configurable via software (nitrogen, oxygen, CO2, nitric oxide, argon).
ATTENTION, currently the device is discontinued, the modern improved model is — VA 520
- Technical Specifications
- Overall Drawing
- Connection diagram
- Applications
| Technical Specifications VA 420 | |
| Measurable Parameters | m³/h, l/min (1000 mbar, 20° C) for compressed air. Nm³/h, Nl/min (1013 mbar, 0°C) for gases |
| Configurable from Display | m³/h, m³/min, l/min, l/s, ft/min, cfm, m/s, kg/h, kg/min |
| Measurement Principle | Thermoanemometric |
| Sensing Element | Two silicon plates |
| Measurable Medium | Air, gases |
| Gases Configurable via Software | Air, nitrogen, argon, nitric oxide, CO2, oxygen |
| Measurement Range | See specification |
| Accuracy | ± 1.5% of measured value ± 0.05% FSV. On request: special 5-point calibration with ISO certificate |
| Operating Temperature | -30...80 °C |
| Operating Pressure | Up to 16 bar Optionally up to 40 |
| Analog Output | 4...20 mA for m³/h or l/min |
| Pulse Output | 1 pulse per m³ or l, galvanic isolation |
| PC Connection | SDI interface |
| Power Supply | 24 VDC ± 15 % |
| Load | < 500 Ω |
| Housing | Polycarbonate |
| Sensor Probe | Stainless steel, 1.4301 or 1.4404 |
| Connection Thread | R 1/4“, R 1/2“, R 3/4“, R 1“, R 1 1/4“, R 1 1/2“, R 2“ external thread Flanges according to DIN EN 1092-1 standard, with groove or tongue on request |
Version with threaded connection:
Version with flange connection:
|
Connector A |
Connector B |
 |
 |
| Contact Number | Contact Color | Function (Connector A) |
Function (Connector B) |
| Contact 1 | brown |
NC (SDI) |
NC (SDI) |
| Contact 2 | white | -VB | NC |
| Contact 3 | blue | +VB | NC |
| Contact 4 | black |
I+ |
Pulse isolated |
| Contact 5 | gray | NC | Pulse isolated |
|
Designation |
Comment |
|
-VB |
Power supply negative 0 V |
|
+VB |
Power supply positive 12...30 VDC |
|
I + |
Current signal 4..20 mA – flow rate |
|
Pulse |
Pulse output for accumulated |
|
NC |
Do not connect to power or ground. |
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