Ashcroft F5401 Handleiding voor installatie en onderhoud - Pagina 4

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4 Labeling on the device

The label with the serial number and type designation is located on the outside of the housing. The materials identifier
is encoded in the type designation.
5

Construction and function

5.1
Overview
1. Connecting rod
3. Sensing diaphragm
5. Lever
7. Pressure transfer liquid
5.2
Description of function
The pressures to be compared act on flexible stainless steel diaphragms on either
side of the sensing capsule. The two diaphragms are mechanically linked by a rigid connecting rod. To compensate
high static pressures, the cavity between the two diaphragms is filled with hydraulic fluid. When pressures are equal
on both diaphragms, they are at zero position. When there is a difference in pressures acting on the two diaphragms,
they are deflected away from the high pressure side, towards the lower pressure side, causing a displacement of the
connecting rod.
A precision mechanism translates the linear displacement of the diaphragm connecting rod to angular movement of
the gauge's dial pointer. The pointer's displacement range of 270
The connecting rod has intermediate flanges on either side, which protects the diaphragms against excess differential
pressure.
When differential pressure exceeds the specified limit, the flange towards the lower pressure side is pressed against
the sealing O-ring on the inside of the sensing capsule. This action isolates the fluid adjacent to the diaphragm
exposed to lower pressure, from the fluid at higher pressure on the other side. This limits the pressure differential
across the lower pressure diaphragm, and equalizes the pressure across the higher pressure diaphragm. Thus both
diaphragms are protected against excess deflection and risks of rupturing. The model F5503-HP is designed for higher
static pressure than the F5503 with stronger pressure chambers and mounting parts.
5.1
Description of components
5.1.1 Scale with pointer
The differential pressure gauge is equipped with a dial face and pointer pursuant to EN 837-3, nominal size 100 mm or
160 mm.
5.1.2 Instrument connection
The instrument connection is located on the underside of the differential pressure gauge and can be a threaded or
flanged similar to DIN EN 61518.
5.1.3 Vent and flushing connection
The vent and flushing connection of each pressure chamber is located on its top side. It is closed by a screwed in G ½
plug.
5.2 Accessories
Please contact the manufacturer regarding special tools and accessories.
6 Transport
6.1
Safety
The differential pressure gauge should be protected against the effects of knocks and impacts. The device should only
be transported in the packaging provided, to protect against glass breakage. The device should only be transported in
a clean condition (free of residues of measuring media).
2. O-Ring, differential overpressure protection
4. Movement
6. Link
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3
1
2
°
corresponds to the full scale differential pressure.
�ASHCROFT"
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