Differential pressure measuring and switching device (flow guards) for explosive areas which is suitable for differential pressure, overpressure and underpressure measurements in heat transfer oil systems and hot water systems. The operating principle of the system is identical in all three applications.
The flow guards comprise of a differental pressure transducer, e.g. measuring orifice, the differential pressure measuring ans switching device and corresponding shut-off fittings.
| General points: | |
| Measuring ranges: | 0 ... 400 mbar to 0 ... 6 bar |
| Rated pressure of the measuring system: | 25 bar |
| Max. stat. operating pressure: | depending on the measuring range (see order table) |
| Max. pressure load: | one-sided over-pressure-proof up to the rated pressure of the measuring system resistance to under-pressure on the (+) and (-) side |
| approved temperatures for use in explosive areas | |
| Authorized ambient temperatures: | -10°C ≤ Tamb ≤ 60°C |
| Max. approved medium temperature in the device: | 60°C |
| Max. approved surface temperature: | T70°C |
| Type of protection: | IP 65 acc. to DIN EN 60529 |
| Installation position: | Pressure connections below |
| Measuring accuracy: | ± 2.5 % of the upper range value |
| Zero-point adjustment: | Arranged in the front panel of the scale |
| Switch points | |
| Contact output: | 1 or 2 micro-switches, 1-pole changeover contact |
| Switch point setting: | After opening and removing the bayonet ring, can be set to the reference csale via the front pane; smallest settable value approx. 5% of the end value of the measuring range |
| Switch point reproducibility: | Corresponds to the measuring accuracy |
| Switch hysteresis: | approx. 2.5% of the upper range value |
| Load data / contacts for use in explosive areas | |
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Highest values per electricity circuit: |
Ui = 30 V |
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Connections |
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Electrical connections |
Cable connection socket |
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Pressure connection |
Inner thread G 1/4, cutting ring screw connections pipes 6, 8, 10, 12 mm made of brass, steel or chr omium nickel steel Connection spigot G1/4 B DIN EN 837 |
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Measuring system |
Pressure spring measuring membrane system, membranes made of fabric-reinforced |
Pressure chamber:
Aluminium GkAlSi10(Mg), painted black
Measuring membrane:
Inner parts in contact with mediums:
Casing/bayonet ring:
Front pane:
Weight:
