Thermal Flow Switch for monitoring of flow rate of air and gases.
- Patented sensor head (dumb-bell head):
- Largely independent from flow direction
- Easy to clean (free of undercuts)
- Dirt-resistant
- Probe length 100 … 500 mm
- Measuring ranges 0 … 1 m/s to 0 … 20 m/s
- Visual indication of switching and operating status
- Potentiometer (pre-programmed as option)
- Increased resistance to media with optional coating
- Exhaust air monitoring system
- Filter monitoring
- Fume cupboards
- Clean room and Pharma
- Ventilation and Air conditioning
- Semiconductor process equipment
Accessories
Connection technology
| Description | Article-Number |
|---|---|
| Power supply unit: output 24 V / 1A DC, supply voltage 115/230 V AC (strip terminal) | 535 282 |
Mounting and fixing technology
| Description | Article-Number |
|---|---|
| Mounting flange, galvanized steel | 301 048 |
| Wall mounting flange, stainless steel, PTFE clamp ring | 520 181 |
| Compression fitting, stainless steel, G½, atmospheric pressure | 532 160 |
| Compression fitting, brass, G½, atmospheric pressure | 517 206 |
| Compression fitting, stainless steel, G½, max. 10 bar, with protection against pressure losses | 524 919 |
| Compression fitting, brass, G½, max. 10 bar, with protection against pressure losses | 524 891 |
| Welding sleeve, steel, G½, according to EN 10241, 5 pieces | 524 916 |
| Welding sleeve, stainless steel, G½, according to EN 10241, 2 pieces | 524 882 |
Miscellaneous
| Description | Article-Number |
|---|---|
| Clip-on bars for protection of sensor head against mechanical impacts, stainless steel | 531 026 |
| Attachable 2-wires-clip for protection of sensor head against mechanical impacts, stainless steel, H2O2-resistant | 559 124 |
| Technical data | |
|---|---|
| Measuring quantity | Standard flow velocity wN based on standard conditions 1) |
| Measured medium | Air or nitrogen, other gases on request |
| Measuring range wN | 0 … 1 / 2.5 / 10 / 20 m/s |
| Lower detection limit wN | 0.06 m/s |
| Threshold wN | 5 … 95 % of measurement range (min. 0.1 m/s) |
| Threshold setting wN | Potentiometer (270°)>br>Optionally pre-programmed by factory (potentiometer deactivated) |
| Measuring accuracy | |
| Switching hysteresis wN | ±5 % of threshold value; min. 0.1 m/s |
| Setting switching threshold wN | Potentiometer (270°); optionally fix pre-programmed |
| Threshold pre-programmed wN | ±3 % of measuring value + 0.1 m/s 2) |
| Response time (t90) wN | 3 s (jump of wN from 0 to 5 m/s in air) |
| Switch-on delay | 20 s |
| Temperature gradient wN | < 2 K/min (at wN = 5 m/s in air) |
| Operating temperature | |
| Sensor | -20 … +85 °C |
| Electronics | -20 … +70 °C |
| Storage temperature | -20 … +85 °C |
| Material | |
| Enclosure | PBT (glass-fibre reinforced) |
| Sensor tube | Stainless steel 1.4571 |
| Sensor head | PBT (glass-fibre reinforced), stainless steel 1.4571 |
| Protective coating (optional) | Polyurethane derivative |
| Sensor cable | PVC |
| General data | |
| Humidity | Measuring mode: Non-condensing (< 95 % RH) |
| Operating pressure (max.) | 0 … 10 bar (overpressure) |
| Display | LED green: Operating status; LED red: Switching status / sensor defective |
| Supply voltage | 24 V DC ± 20 % |
| Current consumption | Typical 40 mA (max. 70 mA, without signal current of relais output) |
| Switching output | Semiconductor relais; max. 30 V / 100 mA / 300 mW RON,max = 25 Ω |
| Electrical connection | Non-detachable cable, 4 wires, length 2 m, with ferrules |
| Maximum cable length | 100 m max. |
| Mounting position | Arbitrary |
| Minimum immersion depth | 58 mm (< 58 mm on request) |
| Protection type | Sensor probe: IP67; Enclosure: IP65 (with installed rubber plug) |
| Protection class | III (SELV or PELV) |
| MTTF value (per 01.01.2011) | > 50 years |
| Probe length L | 100/200/350/500 mm |
| Weight | Approx. 100 g (L = 350 mm) |
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