testo 6448 – flow transmitter for flexible pipe dimensions
For compressed air for flexible pipe dimensions (DN40 - DN300)
- Can be installed under pressure
- Measures flow velocity (m/s) in the measuring range 0...80 m/s or 160 m/s, consumption measurement in Nm³ and median temperature in °C.
- Several measurement sites can be covered by one sensor
The mobile compressed air flow transmitter testo 6448 is used for the determination, monitoring, control and reporting of compressed air consumption and thus for the determination of leakage in compressed air systems, as well as consumption-based cost allocation and peak load management.
- Can be installed under pressure
- Measures flow velocity (m/s) in the measuring range 0...80 m/s or 160 m/s, consumption measurement in Nm³ and median temperature in °C.
- The backstop and ball valve ensure quick and safe installation and de-installation of the compressed air sensor on site. This means that several sites can be covered by one sensor.
- Maximum flexibility thanks to different signal outputs:
- Analog output 4 to 20 mA (4-wire)
- Pulse output
- 2 binary outputs (parameterizable: consumption- or volume flow-dependent, opening, closing, hysteresis, window)
The probe is optimized for easy, safe and quick installation and can be used for measurements on different pipe diameters. An optimal drilling clamp enables precise positioning of the sensor without the need for welding.
The respective supply line may remain under pressure when installing this drill clamp or during maintenance / replacement of the sensor (normal operating conditions). A ball valve allows the compressed air line to be closed securely and airtight when removing the sensor and when reinstalling it.
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| Selectable units | m/s |
|---|---|
| Measuring range1 | 0 to 160 m/s |
| Accuracy | ±3% of meas. value ±3 % of fsv (at room temperature) |
| Sensor | Thermal, glass-coated ceramic sensor (calorimetric measurement procedure) |
| Response time | < 0.1 sec (for damping parameter = 0), delayable via operating menu (0 to 1 sec) |
| (Norm) volume flow | |
| Selectable units | m3/h, m3/min, m3 |
| Measuring range1 | Maximum measuring range of volume flow is dependent on inner pipe diameter (see page 3) |
| Temperature | |
| Unit | °C |
| Measuring range | 0 to +60 °C / 32 °F to +140 °F |
| Inputs and outputs Analog outputs | |
| Output type | 4 to 20 mA (4-wire) freely scalable between zero and measuring range end |
| Load | max. 500 Ω |
| Further outputs | |
| Pulse output | Pulse speed freely settable in 1 m3 steps |
| Switch output | 2 switch outputs, parameterizable (consumption or volume flow-dependent, NC, NO, hysteresis, window), loadable with max. 20 to 30 VDC or 250 mA each, switch status is displayed via 2 LEDs |
| Supply Voltage supply | 19 to 30 V DC |
| Current consumption | <100mA |
| Connection | M12 x 1 plug, loadable up to 250 mA, short-circuit-proof (synchronized), reverse-polarity-proof, overload-proof |
| Material housing | PBT-GF 20, PC (APEC), Makrolon, V2A (1.4301), Viton |
| Weight | 850 g |
| Display | |
| Display | 4-figure alphanumerical display, two operating buttons, operating menu, LED (4 x green for phys. units, 3 x yellow for display x 1,000 or switch status) |
| Operation | |
| Parameterization | 2 operating buttons |
| Miscellaneous | |
| Protection class | IP 65/III |
| EMC | according to guideline 89/336 EEC |
| Media contact | V2A (1.4301), PEEK, polyester, Viton, anodized aluminum, glass-coated ceramics |
| Standard reference | Calculation of volume flow due to manual input possibility of temperature, humidity and pressure. Work settings: 15 °C, 1013.25 hPa, 0%RH |
| Humidity (sensor) | rel. humidity < 90%RH |
| Operating temperature (housing) | 0 to +60 °C (+32 to +140 °F) |
| Storage temperature | -25 to +85 °C (-13 to +185 °F) |
| Measurement medium | Compressed air, with special calibration also CO2 or N2 |
| Process pressure | PN 16 (max 16bar/232psi) |
| Pressure tightness/ pipe clamp | 16 bar (max.) for DN40-DN200; 10 bar (max.) for DN250 |
| Air quality | ISO 8573: recommended classes 1-4-1 |
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cabling
695 SKU 0699 33935 meter long connection cable with screw thread M12 and loose ends.
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Power supplies for Hygrotest
2 590 SKU 0554 1748Power supply 220 V - 24 V DC, for Hygrotest. Input: 110 ... 240 VDC. Output: 24 VDC/350 mA.
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Power supply unit (DIN rail mounting)
3 150 SKU 0554 1749Mesh thread for DIN rail. Input: 85 ... 264 VAC | 110 ... 300 VDC. Output: 24 VDC/2.5 A.
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