Ashcroft F6509 Panduan Petunjuk Pemasangan dan Pemeliharaan - Halaman 4

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Installation and Maintenance Instructions for

F5509/F6509 Differential Pressure Gauges

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.

7.3.2 Electrical connection

• Connection to be undertaken by authorized and qualified

specialist staff only.

• The electrical connection of the device is to be undertaken in

accordance with the relevant regulations of the VDE and the

regulations supplied by the local utilities company

• Disconnect the plant from the main supply before wiring

electrical connections.

• Install appropriate fuses upstream.

Switch 1

All sales subject to standard terms and conditions of sale. F5509_gauge_im1.0, Rev. A, 08/18

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 checked.

7.4.1 Zero point adjustment

The pressure gauges are supplied calibrated at the factory, so

that as a rule there is no need for calibration at the installation

point. For devices with Micrometer pointer (see. order code),

zero pointer adjustment on site is possible. For this, proceed as

follows:

• Equalize pressure in both chambers.

• Check if internal pressure was built up in the case due to

ambient temperature effect. Open valve (position B), wait for

pressure relief and close valve again (position A)

• Lift up on vent plug.

• Use zero pointer adjustment

screw to set the pointer

to zero.

7.4.2 Setting the electric contacts

An adjustable lock is fitted in the front panel of the pressure

gauge. Using the removable adjustment key, the contacts

mounted on the target value indicators can be set to any

point on the range covered by the scale. For reasons relating

to accuracy of switching and the lifetime of mechanical

measurement systems, the switch points should be positioned

between 10% and 90% of the range.

• Place the

adjustment key

on the axle of the

adjustable lock.

• Press the axle

Switch 2

inwards, until the

carrier arm grips

behind the adjuster

pin on the target

value indicator.

• By turning the key,

adjust the target

value indicator to

the desired switch

point.

• Mount vent plug

Filled Models need to be vented before

commissioning by opening the air valve

on the upper side of instrument!