Ashcroft 5503 Series Руководство по установке и обслуживанию - Страница 4

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Ashcroft 5503 Series Руководство по установке и обслуживанию

Installation and Maintenance Instructions for

5503 Differential Pressure Gauges

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 undertaken by authorized and qualified

staff specialist 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 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.

• 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

Take note of the electrical data in the EU design type test cer-

tification and the locally-applicable regulations and

guidelines for installing and

operating electrical plant in explosion risk areas

(e.g. EN 60079-14, EN 50281-1-2 etc.).

• Connection to be undertaken by authorized and qualified

staff specialist 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 equipment from the power supply before

wiring electrical connections.

• Install appropriate fuses upstream.

All sales subject to standard terms and conditions of sale. 5503_gauge_i&m_RevA_07-18-19

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

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 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.

Please refer

to the label

for configuration

of connections.

Filled Models need to be vented before

commissioning by opening the air valve on the

upper side of instrument!