Ashcroft F5509, Installation And Maintenance Instruction Manual

Page: 10 / 27

Page 10 of 27

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 mains supply before wiring electrical connections.

Install appropriate fuses upstream.
Please refer to type label
for configuration of
connections. Switch 1 Switch 2
8.4 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.
8.4.1 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.

Mount vent plug
Filled Models need to be vented before commissioning
by opening the air valve on the upper side of instrument!
8.4.2 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 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.
Release the pressure on the axle, and remove the adjustment key.