Ashcroft 1082 설치, 운영 및 유지보수 매뉴얼 - 페이지 5
{카테고리_이름} Ashcroft 1082에 대한 설치, 운영 및 유지보수 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. Ashcroft 1082 20 페이지. Pressure gauge
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1.0 SELECTION & APPLICATION
Users should become familiar with ASME
B40.1 (Gauges – Pressure Indicating Dial
Type – Elastic Element) before specifying
pressure measuring instruments. That docu-
ment – containing valuable information
regarding gauge construction, accuracy, safety,
selection and testing – may be ordered from:
ASME International
Three Park Avenue
New York, N.Y. 10016-5990
800-843-2763 (US/Canada)
95-800-843-2763 (Mexico)
973-882-1167 outside North America
Email: [email protected]
WARNING: To prevent misapplication, pres-
sure gauges should be selected considering
media and ambient operating conditions.
Improper application can be detrimental to the
gauge, causing failure and possible personal
injury, property damage or death. The infor-
mation contained in this manual is offered as
a guide in making the proper selection of a
pressure gauge. Additional information is
available from Ashcroft Inc.
The following is a highlight of some of the more
important considerations:
1.1 Range – The range of the instrument
should be approximately twice the maximum
operating pressure. Too low a range may
result in (a) low fatigue life of the elastic ele-
ment due to high operating stress and (b) sus-
ceptibility to overpressure set due to pressure
transients that exceed the normal operating
pressure. Too high a range may yield insuffi-
cient resolution for the application.
1.2 Temperature – Refer to page 6 of this
manual for important information concerning
temperature related limitations of pressure
gauges, both dry and liquid filled.
1.3 Media – The material of the process sensing
element must be compatible with the process
media. Use of a dia-phragm seal with the gauge
is recommended for process media that (a) are
corrosive to the process sensing element; (b)
contain heavy particulates (slurries) or (c) are
very viscous including those that harden at
room temperature.
1.4 Oxidizing media – Gauges for direct use
on oxidizing media should be specially
cleaned. Gauges for oxygen service should be
ordered to variation X6B and will carry the
ASME required dial marking "USE NO OIL"
in red letters. Gauges for direct use on other
oxidizing media may be ordered to variation
X6W. They will be cleaned but carry no dial
marking. Plus!
®
gauges or Halocarbon filled
gauge or diaphragm fill is required for use
with oxidizing media; order variation XCF.
1.5 Pulsation/Vibration – Pressure pulsation
can be dampened by several mechanisms; the
patented PLUS! Performance gauge will han-
dle the vast majority of applications. One
exception to this is high frequency pulsation
which is difficult to detect. The only indication
may be an upscale zero shift due to movement
wear. These applications should be addressed
with a liquid filled gauge, or in extreme cases,
a remotely mounted liquid filled gauge con-
nected with a length of capillary line. The
small diameter of the capillary provides excel-
lent dampening, but can be plugged. The
Ashcroft 1106 pulsation dampener and 112
snubber are auxiliary devices which dampen
pulsation with less tendency to plug.
1.6 Gauge fills. – Once it has been determined
that a liquid filled gauge is in order, the next
step is selecting the type of fill. Glycerin sat-
isfies most applications. While being the least
expensive fill, its usable temperature range is
20/250°F. Silicone filled gauges have a
broader service range: –40/250°F. Oxidizing
media require the use of Halocarbon, with a
service range of –50/250°F. Pointer motion
will be slowed at the low end of the low end of
these temperature ranges.
1.7 Mounting – Users should predetermine
how the gauge will be mounted in service:
stem (pipe), wall (surface) or panel (flush).
Ashcroft wall or panel mounting kits should be
ordered with the gauge. See paragraph 3
Installation.
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