Ashcroft F5509, Installation And Maintenance Instruction Manual

Page: 9 / 27

Page 9 of 27
7.3 Storage
The differential pressure gauge must be stored in dry, clean conditions, within a temperature range of -20 to +70 °C,
protected against direct exposure to sunlight and protected against impact damage.
8 Assembly/Installation
8.1 Safety
To ensure safe working during installation and servicing, suitable shut-off valves must be installed in the plant (see 6.4
Accessories), enabling the device:

To be depressurized or taken out of operation;

To be disconnected from the pressure source for repair or check within the relevant plant;

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.
8.2 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 mounting 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.
8.3 Mounting/Installation
8.3.1 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 8.4.1 Zero point adjustment).

Connection to be made by authorized and qualified personnel only.

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 process piping must be depressurized.

The process pipe must be installed on an incline so that:
- for fluid measurement, no air pockets are created
- for gas measurement, no water pockets are created
If the necessary incline is not achieved, then at suitable points water separators or air separators must be
installed.

The pressure process pipe must be kept as short as possible and installed without sharp bends, to avoid a
delayed response time.

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.

If water is used as the measurement medium, the device must be frost-protected.
Safety notice: Only mount using the correct open-jawed wrench, and do not twist the device itself.
8.3.2 Electrical connection
Take note of the electrical data in the EU design type test certification and the locally-applicable regulations
and guidelines for installing and operating electrical plant in explosion risk areas (e.g. EN 60079-14,
EN 60079-17 etc.).