Ashcroft F5509 Handleiding voor installatie- en onderhoudsinstructies - Pagina 3

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Installation and Maintenance Instructions for
F5509/F6509 Differential Pressure Gauges

5. CONSTRUCTION AND FUNCTION

5.1 Overview
1 - Sensing diaphragm
2 - Sealing/spring bellows
3 - Connecting rod
4 - Pointer mechanism
5.2 Description of function
The pressures to be compared, differential pressure, act on
a flexible stainless steel diaphragm, which separates the two
pressure chambers.The diaphragm is mechanically linked by a
rigid connecting rod. When pressures are equal on both sides,
the diaphragm is on zero position. When there is a difference
in pressures the diaphragm is 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° corresponds to the full
scale differential pressure.
5.3 Description of components
5.3.1 Scale with pointer
The differential pressure gauge is equipped with a dial face and
pointer pursuant to DIN 16003, nominal size 100 mm or 160 mm.
5.3.2 Instrument connection
The instrument connection is located on the underside of the
differential pressure gauge and can be male or female threaded
process connection. Distance between ports is 37 mm, please
consider this when selecting a 5 valve manifold.
5.3.3 Vent plug
The vent plug for the housing is located on the top of the
gauge case. If the nipple is pulled out, the housing is vented
and the pressure which has built up in the housing due to the
influence of temperature is discharged. With the plug closed,
protection class IP 66 is achieved.
5.3.4 Rear wall/plug with blow-out capability
The pressure gauge has a plug capable of blowing out on
the rear wall of the housing (Model F5509) or a rear wall
capable of blowing out (Model F6509). These act as a safety
feature pursuant to DIN 16003 and simultaneously allow
for temperature compensation for the housing, via a rubber
membrane
5.4 Accessories
Please contact the manufacturer regarding available special
© Ashcroft Inc. 2018, 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: 203-378-8281, Fax: 203-385-0357, www.ashcroft.com
All sales subject to standard terms and conditions of sale. F5509_gauge_im1.0, Rev. A, 08/18
tools and accessories. (e.g.5 valve manifold).
6 TRANSPORT
6.1 Safety
The 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).
6.2 Transport inspection
The delivery must be checked for completeness and damage
during transport. In the event of damage during transport, the
delivery must not be accepted, or only accepted subject to
reservation of the scope of the damage being recorded and, if
necessary, contact Ashcroft for instructions.
6.3 Storage
The differential pressure gauge must be stored in dry, clean
conditions, within a temperature range of -20 to +80 °C,
protected against direct exposure to sunlight and protected
against impact damage
7 ASSEMBLY/INSTALLATION
7.1 Safety
To ensure safe working during installation and servicing,
suitable shut-off valves must be installed in the plant (see 5.4
Accessories), enabling the device:
• To be depressurized or taken out of operation;
• To be disconnected from the pressure source for repair or
inspection;
• Or to enable function tests of the device to be performed "on
site".
During the works to mount/install the gauge, the plant must be
protected against being switched back on.
7.2 Preparations (requirements for the installation location)
• A check on suitability of the device for the medium to be
measured, the scope of the measurement range and static
pressure and of the protection against special conditions such
as vibration, pulsation and pressure spikes.
• A bracket must be installed to support the pressure gauge if
the mountering process pipe is not able to provide adequate
support.
• The installation location should be chosen such that the
work-spaces for operating personnel are not located to the
rear of the pressure gauge.
7.3 Mounting/Installation
7.3.1 Process connection
The instrument is intended and factory adjusted for vertical
mounting, pressure ports downward. When mounted in other
orientation (max. ± 10°) the pointers' zero position needs to be
adjusted (see 7.4.1 Zero point adjustment).
• Connection to be made by authorized and qualified personnel
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