General Industrial Compressed Air Flow Sensor — SS 20.261
Спецификация SS 20.261
Available on request
Delivery across Russia
Order phone: +7(800)777-18-50
Description
The SS 20.261 flow sensor operates on the principle of a wire thermal anemometer. Therefore, its use in pressurized systems has no significant limitations. The flow sensor measures the gas flow velocity, normalized to standard conditions, regardless of the pressure level (up to 10 bar). The device has two analog output signals 4..20 mA: for temperature and for normalized flow velocity (from 0 m/s to 40, 60, or 90 m/s). The measured normalized flow velocity can be easily converted to volumetric flow (see the table in the specification).
Thanks to the measurement principle of the sensitive element, the sensor can measure over a wide range of velocities from 0.2 to 90 m/s. The flow meter is designed to measure flow rates up to 74,000 Nm3/h in pipes from DN 25 to DN 600. The ability to detect even small gas flows allows this flow meter to be used for leak detection.
Upon customer request, a high-precision calibration of the sensor confirmed by an ISO certificate can be performed. SCHMIDT Technology carries out calibration on a special setup and can be repeated upon customer request.
Advantages
- Direct measurement of velocity normalized to standard conditions up to 90 m/s without additional compensatory calculations for pressure or temperature;
- No moving parts and maintenance-free;
- Integrated temperature measurement;
- High-precision calibration with ISO calibration certificate (optional);
- Compact design and easy installation;
- Protection against ejection (in case of operation under pressure);
- Suitable for pipes from DN 25 to DN 600;
- LED indication;
- Overpressure up to 10 bar.
- Specifications
- Overall Drawing
- Connection diagram
- Applications
| Technical Specifications SS 20.261 | |
| Measured parameter | speed wN, normalized to standard conditions (TN = 20 °C, pN = 101325 Pa) |
| Measured media | air, nitrogen, other gases on request (except flammable gases) |
| Speed measurement ranges | 0 … 40 / 60 / 90 m/s |
| Min. measurable value | 0.2 m/s |
| Accuracy in basic version | ±5% of measured value + 0.4% of measurement range |
| Accuracy in precision version | ±3% of measured value + 0.4% of measurement range |
| Reproducibility wN | ±1.5% of measured value |
| Response time t90 | 3 s (step from 0 to 5 m/s) |
| Temperature gradient | 8 K/min at 5 m/s |
| Temperature measurement range | -20…+85 °C |
| Temperature measurement accuracy | ± 1 K at wN > 2 m/s |
| Probe operating temperature | -20 … +85 °C |
| Electronics operating temperature | 0 … 70 °C |
| Housing material | PBT plastic, fiberglass reinforced |
| Probe material | stainless steel 1.4571 |
| Sensitive element material | ceramic, glass-passivated |
| Compression fitting material | brass |
| Cable material | PVC |
| Process connection | compression fitting, G½ external thread |
| Medium | gas without condensate (up to 95% relative humidity) |
| Output signals | 2 x 4 … 20 mA, RL ≤ 300 Ohm, CL ≤ 10 nF |
| Maximum cable length | 100 m |
| Indication | two LEDs |
| Power supply | 24 VDC ± 10 %, 60 mA |
| Start-up time | about 10 s after power on |
| Electrical connection | cable outlet, 4-wire, length 2 m, with stripped ends |
| Probe length | 200 / 350 mm |
| Installation error | ± 3° to flow direction |
| Spatial orientation | arbitrary (except downward flow with speed wN < 2 m/s) |
| Protection class | IP 65 |
|
Wire Color |
Designation |
Function |
|
Brown (BR) |
Power |
Operating voltage: +UB |
|
White (WH) |
GND |
Operating voltage: Ground |
|
Yellow (YE) |
Analog wN |
Output signal: Speed |
|
Green (GR) |
Analog TM |
Output signal: Ambient temperature |
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