Variant 1 - Thermal mass flow¶
Thermal mass flow measurement principle (order code: PCD-S-Fxx)
In this measurement technique, a heating element is placed between two temperature sensitive resistors. Due to a gas flow, the temperature profile is moved towards one of the resistors, which can be measured and evaluated.
Sensor features:
| Important: When using the PCD's to measure differential pressure and the reference 0 point is daisy chained via multiple PCD's, then please only use the Variant 2 - Membrane sensors and not the Variant 1 - Thermal mass flow flow sensors. The flow sensor leaks per design and as of such is not designed for this application. |
|---|
The PCD can be connected also directly to a PC using an AC3001 / AC3001-XD cable.
Further accessories can be found in the Accessories.
| PCD-S-Fxx | Sensor | Thermal mass flow |
|---|---|---|
| Leak rate | <180 µl/min | |
| Accuracy1 | ±1 % full scale | |
| Long term stability | 0.1 % full scale /year | |
| Zero point compensation2 | Automatic (1 x per measurement interval) | |
| Temperature compensation | Yes | |
| Ambient pressure compensation | Automatic | |
| Pressure resistance | 5 bar (Burst pressure) | |
| PCD-S-Mxx | Sensor | Membrane |
| Leak rate | 0 µl/min | |
| Accuracy3 | ±1 % full scale | |
| Long term stability4 | ±2 %FSS/year for ±25 Pa probe ±1 %FSS/year for ±50 Pa probe ±0.5 %FSS/year for ±100 Pa probe ±0.25 %FSS/year for ±250 Pa and ±500 Pa probes |
|
| Zero point compensation5 | Manual | |
| Temperature compensation | Yes | |
| Ambient pressure compensation | Not necessary | |
| Pressure resistance | 0.7 bar (Burst pressure) | |
| All | Range of application (pressure) | ±25/50/100/250/500 Pa |
| Range of application (temperature) | -20…80 °C | |
| Range of application (humidity) | 0…95 %rh (non-condensing) | |
| Diameter | 32 mm | |
| Length | 87 mm | |
| Housing material | Polycarbonate, anthracite | |
| Weight | 60 g |
1 Incl. reproducibility, hysteresis error, non-linearity and position sensitivity; at 23 °C ±3 K ambient temperature
2 For detailed considerations, please see the function overview.
3 Incl. reproducibility, hysteresis error, non-linearity and position sensitivity; at 23 °C ±3 K ambient temperature and directly after a zero point compensation
4 Highly reducible by a zero point compensation
5 For detailed considerations, please see the function overview.