Ashcroft DG25 General Purpose Digital Gauge Manual de usuario descargar pdf (Pagina 3)

(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 dam-

aging effects:

• Digital Gauge exhibits large zero offset.

• Digital Gauge pressure display remains

constant regardless of pressure

• Error code is displayed on screen.

FREEZING:

Prohibit freezing of media in pressure port.

Unit should be drained. (Mount in vertical po-

sition to prevent possible overpressure

damage from frozen media.)

3. INSTALLATION:

This procedure requires the use of a 1

1

⁄16˝

(27mm) hex wrench for tightening the in-

strument to the process connection. Apply

Teflon tape or a suitable sealing compound

to NPT threads of the gauge. Take using the

wrench, tighten 1 turn beyond hand-tight

or until a leak-proof seal has been

achieved.

Caution: Tightening the product by

grasping or putting a tool on the plastic

housing can cause permanent damage to

the product.

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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 in-

strument temperature, corrosion of the pres-

sure containing parts, or other misuse.

Consult Ashcroft Inc. Stratford, Connecticut,

USA before installing if there are any ques-

tions or concerns.

2. OVERPRESSURE:

Pressure spikes in excess of the rated over-

pressure capability of the gauge may cause

irreversible electrical and/or mechanical

damage to the pressure measuring and con-

taining elements. Fluid hammer and surges

can destroy any pressure transducer and

must always be avoided. A pressure snubber

should be installed to eliminate the damaging

hammer effects. Fluid hammer occurs when

a liquid flow is suddenly stopped, as with

quick closing solenoid valves. Surges occur

when flow is suddenly begun, as when a

pump is turned on at full power or a valve is

quickly opened.

PRESSURE SURGES:

Surges are particularly damaging to pressure

gauges if the pipe is originally empty. To avoid

pressure surges, fluid lines should remain full

DG25 I&M Rev. #2_I&M006 10197 7/30/12 11:41 AM Page 3

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