To measure air and gas flows accurately and reproducibly, many parameters have to be correct. It is important how the gas flows against the sensor, and thus the positioning of the sensor often decides about the quality of the results.
The solution for flow measurement – even for dusty air and gases. High precision and compact!
• Dumb-bell head (independent from flow direction, easy to clean)
• Flow and temperature signal
• Probe length 100 … 1,000 mm (optional special length)
• Remote sensor (optional)
• Measuring ranges 0 … 1 m/s to 0 … 50 m/s
• Coating optional
• Pressure resistant up to 10 bar
• ATEX gases, zone 2: II 3G Ex ec ic IIC T4 Gc (optional)
• ATEX dust, zone 22: II 3D Ex tc ic IIIC T135°C Dc (optional)
To measure air and gas flows accurately and reproducibly, many parameters have to be correct. It is important how the gas flows against the sensor, and thus the positioning of the sensor often decides about the quality of the results. The gases to be measured also determine the choice of the right sensor. In safety-relevant areas such as the chemical industry the requirement for explosion protection has also to be considered which means that the selection of a suitable sensor is very limited.
| Humidity | Measuring mode: Non-condensing (< 95 % RH) |
| Operating pressure (max.) | Compact version: 0 … 10 bar (overpressure) Remote version: Atmospheric (700 hPa … 1,300 hPa) |
| Display | 4 x Duo-LEDs (green / red / orange) |
| Supply voltage | 24 V AC/DC ± 20 % |
| Current consumption | Typical < 60 mA (max. 170 mA) |
| Analog outputs (wN, TM) | Auto-U/I: 0 … 10 V / 4 … 20 mA (signal characteristic depends on RL) Voltage output: RL ≥ 550 Ω (short-circuit protected) Current output: RL ≤ 500 Ω Change-over hysteresis: 50 Ω CL ≤ 10 nF |
| Electrical connection | Plug-in connector M12 (A-coded), male, 5-pin, screwed |
| Maximum cable length | Voltage interface: 15 m; Current interface: 100 m |
| Mounting position | Arbitrary |
| Minimum immersion depth | 58 mm (< 58 mm on request) |
| Protection type / class | IP67 (sensor head); IP65 (housing) / III or PELV (EN 50178) |
| ATEX category | II 3D Ex tc ic IIIC T135°C Dc II 3G Ex ec ic IIC T4 Gc |
| Probe length | Compact version: 100 … 1000 mm Remote version: 100 / 150 / 350 mm |
| Weight | 400 g max. (without connecting cable) |
| Measuring quantity | Standard flow velocity wN, based on standard conditions 1) Temperature of medium TM |
| Measured medium | Air, nitrogen, other gases on request |
| Measuring range flow wN | 0 … 1 / 2.5 / 5 / 10 / 20 / 35 / 50 m/s |
| Lower detection limit flow wN | 0.06 m/s |
| Measuring range temperature TM | -40 … +85 °C |
| Measuring accuracy | |
| Standard wN | ± (3 % of measured value + [0.4 % of fmr; min. 0.02 m/s]) 1) |
| High precision (optional) wN | ± (1 % of measured value + [0.4 % of fmr; min. 0.02 m/s]) 1) |
| Response time (t90) wN | 3 s (jump from 0 to 5 m/s in air) |
| Temperature gradient wN | ≤ 2 K/min at 5 m/s |
| Temperature TM (wN > 1 m/s) | ± 1 K (10 … 30 °C); ±2 K (remaining measuring range) |
| Operating temperature | |
| Sensor | -40 … +85 °C |
| Electronics | -20 … +70 °C |
| Storage temperature | -40 … +85 °C |
| Material | |
| Housing | Aluminium, anodised |
| Sensor tube | Stainless steel 1.4571 |
| Sensor head | PBT fibre-glass reinforced, stainless steel 1.4571 |
| Protective coating (optional) | Polyurethane derivate / parylene |
| Protective sleeve (ATEX option) | Aluminium, anodised |
| Sensor cable (remote sensor) | (PUR, halogenfree, UL) |
| 1) Standard velocity wN based on standard conditions of 20 °C and 1,013.25 hPa, related to adjustment reference; fmr = final measuring range Subject to technical changes. | |
In many areas the measurement of the flow velocity and / or the volume flow at higher temperatures of up to +350 °C is very important in terms of energy efficiency, quantity detection and plant control.
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