With high pressure to an accurate measuring result.
The KRAL flow meters OMH series were especially designed to handle high pressures of up to 420 bar that can occur in the field of mechanical engineering, at test benches and in hydraulic applications.
Large flow ranges usually require large pipe cross sections and are therefore bulky flow metering devices. Due to the compact measuring element, the OMH series fits into a small housing and offers the significant advantage of being compact and lightweight in this pressure class, even for high flow rates.
The pressure resistance is provided by a very rigid housing, maintaining the compact dimensions, and at the same time the proven precision of the KRAL flow meters, even at extreme pressure levels.
| Technical data | OMH-013 | OMH-020 | OMH-032 | OMH-052 | OMH-068 | OMH-0100 | |
|---|---|---|---|---|---|---|---|
| Nominal diameter | DN [inch] | 1/2 | 3/4 | 1 | 1 1/2 | 2 | 4 |
| Total length with threaded flange G | [mm] | 150 | 185 | 255 | 320 | 385 | 500 |
| Weight with threaded flange G | [Kg] | 7 | 12 | 29 | 55 | 81 | 150 |
| Flow rate I/h | Qmax | 900 | 2,700 | 9,000 | 31,500 | 63,000 | 180,000 |
| Qnom | 600 | 1,800 | 6,000 | 21,000 | 42,000 | 120,000 | |
| Qmin | 6 | 18 | 60 | 210 | 420 | 1,200 | |
| Flow rate I/min | Qmax | 15 | 45 | 150 | 525 | 1,050 | 3,000 |
| Qnom | 10 | 30 | 100 | 350 | 700 | 2,000 | |
| Qmin | 0.1 | 0.3 | 1.0 | 3.5 | 7.0 | 20 | |
| Max. pressure | [bar] | 420 | 420 | 420 | 420 | 420 | 250 |
| Temperature | [°C] | -20 to +200 | -20 to +200 | -20 to +200 | -20 to +200 | -20 to +200 | -20 to +200 |
| Viscosity | [mm²/s] | 1 to 1×106 | 1 to 1×106 | 1 to 1×106 | 1 to 1×106 | 1 to 1×106 | 1 to 1×106 |
| Precision | of measurement value | ±0.1 % | ±0.1 % | ±0.1 % | ±0.1 % | ±0.1 % | ±0.1 % |
| Repeatability | ±0.01 % | ±0.01 % | ±0.01 % | ±0.01 % | ±0.01 % | ±0.01 % | |
| K-factor | K2 [P/I] | 2,432 | 1,280 | 468 | 142 | 79.6 | 33.6 |
| K3 [P/I] | 7,296 | 2,560 | 1,014 | 302 | 167 | 57.6 | |
| K4 [P/I] | 7,296 | 2,560 | 1,014 | 302 | 167 | 87.6 | |
| Frequency | f2 at Qnom [Hz] | 405 | 640 | 780 | 828 | 929 | 1,120 |
| f3 at Qnom [Hz] | 1,216 | 1,280 | 1,690 | 1,760 | 1,949 | 1,920 | |
| f4 at Qnom [Hz] | 1,216 | 1,280 | 1,690 | 1,762 | 1,948 | 2,920 | |
