Installation and Maintenance Instructions for
F5504 Differential Pressure Gauges
© Ashcroft Inc. 2022, 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. F5504_gauge_i&m_008-10299_RevA_05-02-22
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• Use only with the mechanical process connection
provided – regarding the configuration, see order
code on the device type label, with a matching
threaded seal.
• When connecting the device, the pipes must be
depressurized.
• The pressure metering pipe must be laid inclined in such
a way that, for example, for measurements of fluids no air
pockets can form, and for measurements of gases no water
pockets. If the necessary incline is not achieved, then at
suitable points water separators or air separators must be
installed.
• The pressure metering pipe must be kept as short as possible
and laid without sharp bends, to avoid delays.
• The instruments pressure ports are marked by “+” and “-”
symbols:
“+” port must be connected to the higher pressure
“-” port must be connected to the lower pressure.
• With liquid measurement media, the pressurized connection
pipe must be degassed, since any gas bubble inclusions result
in measurement error.
7.4 Starting up
The precondition for start-up is proper installation of all
electrical feed lines and metering pipes. All connecting lines
must be installed so that no mechanical forces can act on the
device. Before start-up, the seal on the pressurized connection
line must be leak checked.
7.4.1 Zero point adjustment
The differential pressure gauge is factory adjusted therefore in
normal case adjustment during installation is not necessary. On
this devices zero point adjustment on site is possible. For this,
proceed as follows:
• Equalize pressure in both chambers.
• Disassemble screw plug
• Use zero point adjustment screw to set the pointer to zero.
• Mount screw plug
Filled Models need to be vented before
commissioning by opening the air valve on the upper
side of instrument!
8 SERVICING
The device is maintenance-free. However, to ensure reliable
operation and a long lifetime for the device, we recommend
that it is checked regularly.
8.1 Safety
When undertaking servicing work on the device, the pressure
lines must be depressurized, the electrical connections
isolated, and secured against being switched back on.
8.2 Gauge performance and recalibration
The check on function and recalibration is carried out at regular
intervals, depending on the application. The precise testing
cycles should be adjusted in line with the operating conditions
and ambient conditions. In the event of various device
components interacting, the operating instructions for all other
devices should also be taken into account.
• Check on display.
• Check on function, in conjunction with downstream components.
• Check of pressurized connection pipes for seal condition.
8.3 Cleaning and maintenance
Cleaning is carried out using a non-aggressive cleaning agent,
with the ventilation valve closed and respecting the protection
category of the device.
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FAULTS
9.1 Safety
Defective or faulty pressure gauges put the operational safety
and process safety of the plant at risk, and can lead to a risk or
injury to persons, the environment or the plant.
9.2 In the event of failure
All defective or faulty devices must be taken out of service.
If a repair is required, the device must be sent directly to our
Repairs Department. Please contact your Ashcroft distributor
or Ashcroft directly for complete instructions.
9.3 Indications of failure
• Jerky or random movement of the pointer
• Pointer does not set to zero with pressure applied to both
sides
• Indications that the measurement system seal
(diaphragm)
has been breached
(discoloration to dial display or of filling
liquid)
• Bent or loose pointer
• Cracked window
• Leaks when the device is filled
• Damage to housing
In these instances, repair or replacement of the pressure gauge
is always required.
10 REMOVAL, DISPOSAL
