The ALHPD Positive Displacement Helical Flow Meters, consists of, two highly accurate cycloid-shaped screw spindles mesh and rotate inside a cylindrical housing with two overlapping holes in the form of a bores by the profile of the spindles. This happens without pulsation and with minimum leakage. A pickup will inductively detect the speed of the spindle pair through the housing via a pole wheel with a high number of gears. The speed of the spindles is absolutely proportional to the volume
Available when using the local display unit ALVTM. The K-factor (calibration factor) of the helical flow meter defines the exact pulse rate per liter. The ALHPD features a turn down ratios of 100:1, for line sizes of ¼ to 1 ½ inches, low pressure drop and used mainly for high pressure and high viscous fluids.
- High accuracy and Wide measuring ranges 1:100, 1:400
- Suitable for pressures up to 400 bar (5800PSIG)
- Low pressure drop compared with other positive displacement meters
- Double pulse rate and reverse-flow detection possible
- Pulsation-free measurement, non-sensitive to pulsating flows
- Resistant to corrosion by advanced materials and bearings
- Low operating noise
- Ex-protection EExiaIICT6 for zone 1
| Flow range |
0.01 to 400 LPM (0.02-105 USGPM) |
| Line size |
8-40mm (¼"-1½") |
| Operating pressure |
up to 400 barg (5800PSIG) |
| Process temperature |
up to150°C (302°F) |
| Body Material |
SS316 Ti/316L |
| Viscosity |
30 up to 1 x 106 centistokes |
| Enclosure rating |
NEMA 4X (IP 65) |
| Accuracy |
±0.25% of actual flow value (from 100 mm²/s up) |
| Repeatability |
±0.10% |
| Housing protection |
IP65; IP67; IP68 |
| Frequency range |
2 up to 4,000 Hz |
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| Working Humidity |
＜90% @ 75 °F |
| Ambient temperature |
-22 to 158 °F (-30 to +70 °C) |
| Supply Voltage |
3-wire, 8-30 VDC controlled, Ex-versions: 12-30 VDC,< 25 mA |
| Output |
pulse, 4-20 mA or RS485 |
| Display |
rate, total, low flow cut-off, battery consumption |
| User parameters |
K-factors, linear correction coefficient, flowrate input signal section points, temperature |
| Housing |
IP 68, aluminum AlMgSiPb, blue anodized |
| Ex-protection |
II 2 G EEx ia IIC T4, BVS 03 ATEX E 205 |
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