Ashcroft GC51 - Industrial Rangeable Pressure Transmitter Manuel d'utilisateur télécharger pdf (Page 4)

WARNING! READ

BEFORE INSTALLATION

1. GENERAL:

A failure resulting in injury or damage may be caused by excessive

overpressure, excessive vibration or pressure pulsation, excessive instru-

ment temperature, corrosion of the pressure containing parts, or other

misuse. Consult Ashcroft Inc., Stratford, Connecticut, USA before in-

stalling if there are any questions or concerns.

2. OVERPRESSURE:

Pressure spikes in excess of the rated overpressure capability of the trans-

ducer may cause irreversible electrical and/or mechanical damage to the

pressure measuring and containing elements.

Fluid hammer and surges can destroy any pressure transducer and must al-

ways be avoided. A pressure snubber should be installed to eliminate the dam-

aging hammer effects. Fluid hammer occurs when a liquid flow is suddenly

stopped, as with quick closing solenoid valves. Surges occur when flow is sud-

denly begun, as when a pump is turned on at full power or a valve is quickly

opened.

Liquid surges are particularly damaging to pressure transducers if the pipe is

originally empty. To avoid damaging surges, fluid lines should remain full (if

possible), pumps should be brought up to power slowly, and valves opened

slowly. To avoid damage from both fluid hammer and surges, a surge chamber

should be installed.

Symptoms of fluid hammer and surge's damaging effects:

• Pressure transducer exhibits an output at zero pressure (large zero offset).

• Pressure transducer output remains constant regardless of pressure

• In severe cases, there will be no output.

FREEZING:

Prohibit freezing of media in pressure port. Unit should be drained (mount in

vertical position with electrical termination upward) to prevent possible over-

pressure damage from frozen media.

3. STATIC ELECTRICAL CHARGES:

Any electrical device may be susceptible to damage when exposed to static

electrical charges. To avoid damage to the transducer observe the following:

• Ground the body of the transducer BEFORE making any electrical connections.

• When disconnecting, remove the ground LAST!

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Ashcroft GC51 - Industrial Rangeable Pressure Transmitter Manuel d'utilisateur Page 4