Measuring probe
Description
The model A2G-FM measuring probe measures air velocities and air flows in ventilation and air-conditioning systems.
The intelligent design makes for a very easy installation in existing ventilation pipes and ducts.
The A2G-FM measuring probe has 4 ... 12 openings (holes) on each side. The differential pressure openings on the front and back side are separated from each other by design and form two pressure chambers. The length of the measuring probe determines the number of openings. According to the differential pressure method, a dynamic overpressure, the so-called pitot pressure, is created at the front of the measuring probe. Inside the measuring probe, the pressures applied to the differential pressure openings are averaged and fed through to the volumetric flow meter via separate hose connections.
The averaging function enables the probe to better correct interfered flow profiles, which occur many times in the air
Measuring probe, model A2G-FM
duct network, and to measure the air flow more accurately compared to a single-point measurement. The unique shape of the probe enables measurement even at very low air velocities of down to 1.0 m/s.
In combination with the model A2G-25 air flow meter, this offers the user a very accurate and cost-effective air flow measuring equipment.
In conjunction with the model A2G-100 PID controller, a highly efficient and very easily adjusted air flow control for ventilation and air-conditioning systems can be provided.
The measuring probe is available in two different versions, depending on the requirements and the installation situation. The version R is used for circular ventilation pipes and the version L for rectangular ventilation ducts.
Special features
- Multipoint-point measurement for averaging to ensure a high accuracy
- Suitable for low air velocities down to 1 m/s
- Very easy to install
- Available in two versions For circular ventilation pipes (version R) For rectangular ventilation ducts (version L)
- For circular ventilation pipes (version R)
- For rectangular ventilation ducts (version L)
Build a A2G-FM for your task
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- ApplicationVolume flow measurement in rectangular ventilation ducts
- Probe length in mm—
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| Model | A2G-FM |
| Product family | A2G |
| Subcategory | Pitot tube probe |
| Pipe diameter | 80 mm |
| Accuracy | 2 % |
| Process connection | Ø 4.8 mm brass with barbs for pipes with inner diameter 4 mmHigh pressure-Low pressure |
| Process temperature | +5…+95 °C |
| Measurement technology | variable_area |
| Wetted parts material | T3015 aluminium, Sheet steel, Polyurethane foam |
| Datasheet languages | EN, DE |
| Version | |
|---|---|
| Version R | For circular ventilation pipes |
| Available in the standard sizes of Ø80 mm…1,500 mm[3 …59in] The diameter of the ventilation pipe in mmcorresponds to the length of the measuring probe. | |
| Version L | For rectangular ventilation ducts |
| 200 …1,500 mm[8 …59in] (in 50 mmincrements [2 in]) Other sizes of measuring probe on request. The depth of the ventilation duct corresponds to the length of the measuring probe. | |
| Accuracy | ±2% |
| Process connection | Ø4.8 mm[0.2 in] brass with barbs for pipes with inner diameter 4 mm[0.2 in] (→ see "Accessories") + High pressure - Low pressure |
| Material | |
| Sensor | T3015 aluminium |
| Mounting plate | Sheet steel |
| Sealing | Polyurethane foam |
| Relative humidity | 0 …95%r.h., non-condensing |
| Permissible medium temperature | 5 …95°C[41 …203 °F] |
| Mounting | Via two screw holes with Ø5.0 mm[0.2 in] Sizes ≥ 350 mm[14 in] have a Ø6.0 mm[0.2 in] bolt, washer and nut attached to the other end of the measuring probe to stabilise the measuring probe. |
| Weight | On request |
| Duct height in mm[in] | Optimum number of measuring probes | Number of T-connectors |
|---|---|---|
| 150 …300 [6 …12] | 1 | 0 |
| 350 …600 [14 …24] | 2 | 2 |
| 700 …900 [28 …35] | 3 | 4 |
| 1,000 …1,200 [39 …47] | 4 | 6 |
| 1,300 …1,500 [51 …59] | 5 | 8 |
| Description | Order number | |
|---|---|---|
| T-connector | 40407383 | |
| Measuring hoses | ||
| PVC hose, inner diameter 4 mm, roll at 25m | 40217841 | |
| Silicone hose, inner diameter 4 mm, roll at 25m | 40208940 |
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