Ashcroft DPS09 Инструкция по установке и обслуживанию - Страница 6

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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, the electrical connections

isolated from the mains supply, 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.

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Check on display.

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Check on function, in conjunction with downstream components.

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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.

9.2 Conduct in the event of faults

All defective of faulty devices must be taken out of service. If a repair is required, the device must be sent directly to

our Repairs Department. We request that all returns of devices are agreed with our Service Department.

9.3 Fault table

Possible situations indicating a fault:

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Jerky or random movement of the pointer

Pointer does not set to zero for pressure less display

Bent or loose pointer

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Cracked window

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Leaks when the device is filled

Damage to housing

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Indications that the measurement system seal is imperfect (discoloration to dial display or of filling liquid)

In these instances, replacement of the pressure gauge is always required.

9.4 Conduct following fault rectification

See Chapter 7.3 Mounting/Installation

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