Ashcroft T5500 Kurulum ve Bakım Talimatları - Sayfa 4

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Ashcroft T5500 Kurulum ve Bakım Talimatları

Installation and Maintenance Instructions for

T5500 and T6500 Pressure Gauges

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 the occurrence of

irritating delays.

• 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.

7.4 Starting up

The precondition for start-up is proper installation of all

electrical feed lines and metering pipes. All connecting lines

must be laid such 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 ex works, so

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

installation point. For devices with Micrometer pointer (see.

order code), zero point adjustment on site is possible. For this,

proceed as follows:

• Depressurize the pressure metering pipe.

• 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)

• Open the bayonet ring and

remove ring and window.

• Hold the pointer in place

while turning the screw, until

the pointer (after releasing

again) has the correct

position.

• Close the case again and pay attention to correct fit of

window, gasket and bayonet ring.

Liquid filled gauges must be demounted

before the zero point adjustment can be done

(on a horizontal area to prevent leaking).

All sales subject to standard terms and conditions of sale. T5500-6500_gauge_im_RevB_(008-10263)_01-02-19

7.4.2 Use under arctic condition

Pressure gauges with XQC option are designed for ambient

temperature range from -70 °C to 70°C. The vent valve must

be pulled out and open (position B). This vents the case to

atmospheric pressure and avoids wrong indication due to

pressure build up internally or pressure build up in the cause

that can induce fill leakage.

7.5 Subsequent relocation of the gauge (by the customer)

Recommendation: Do not remove the

pressure gauge from one metering point and

fit it in a different place, as there is a risk

of the measuring media being mixed, with

unforeseeable chemical reactions.

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 and the plant secured against

being switched on again.

8.2 Check on function, 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.

9 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.