Seven Steps to Selecta Pressure Gauge
Pressure Gauge Options
BULLETIN G703/08 7.5M BP
Ashcroft Inc., 250 East Main Street, Stratford, CT 06614 USATel:
203-378-8281 Fax: 203-385-0408email: [email protected]
www.ashcroft.com
All specifications are subject to change without notice.All
sales subject to standard terms and conditions. Ashcroft Inc.
2007
4. MEDIA / WETTED PARTSThe wetted parts of the pressure gauge,
the Bourdon tube and socket must be compatible with the process
media. If not compatible with the wetted parts of the gauge,
corrosion will occur. Corrosion of gauge wetted parts will
eventually cause gauge failure and possibly safety issues. When the
gaugewetted parts are not compatible with the process media, a
diaphragm should be considered.
7. PRESSURE RANGESASME B40.100 recommends that normal operating
pressure be confined to 25%-75% of the scale. If pulsation is
present in the process, maximum operating gauge pressure should not
exceed 50% of the full-scale range. CONCLUSIONTo properly select a
pressure gauge, consider the gauge process, range, environment,
accuracy, dial size, connection and mounting requirements.
3. CASE STYLE / MATERIALEnvironmental considerations include
ambient temperature, air-borne particulate, condensation, humidity,
water and chemicals, all of which can affect gauge performance.
Ambient temperature may affect the accuracy and integrity of the
gauge. Gauges are available either temperature compensated or
non-temperature compensated. Ambient conditions may require that
the gauge be isolated from temperature extremes. When required, the
gauge should be isolated fromtemperature extremes with a flexible
line assembly.When ambient conditions are corrosive, contain a
large number of particulate or if the gauge will be exposed to a
wet or humid environment like humidity, wash-downs or rain, specify
a gauge that is weatherproof/hermetically sealed or liquid
filled.
1. ACCURACYFor a mechanical pressure gauge, accuracy is defined
as a percentage of the full-scale range. While requirements differ
from one industry to another, the following are general guidelines:
Test Gauges and Standards: 0.25% through 0.10% full scale
accuracies. Critical Processes: 0.5% full scale accuracy. General
Industrial Processes: 1.0% accuracy. Less Critical Commercial Uses:
2.0% accuracy.
Refer to ASME B40.100 or the DIN specifications for more
information on accuracy.
2. DIAL SIZEPressure gauge dial sizes range from 112 to 16
diameters. Generally, readability requirements, space limitations
and required gauge accuracy determine dial size. Accuracies of
0.25% or 0.5% generally have dial sizes of 412 or larger since more
dial graduations are required.
5. CONNECTION SIZEGauges are available with a variety of
connections including NPT, DIN, JIS, BSP & SAE. Process
pressure gauges with 412 dial sizes or larger are most often
supplied with a 12 NPT connection to best support the gauge.
Factors to consider when selecting a pressure gauge connection
include process pressures, gauge size and weight, space
limitations, leak integrity, and past experience.
6. CONNECTION LOCATIONConsider the following mounting options
when selecting a pressure gauge: Stem mount lower connect
Wall/surface mount lower connect Panel mount back connect U-clamp
flush mount back connect, for panel mounting Front flange flush
mount back connect, for panel mounting
TEST
GAUG
ES
1008
S
GENE
RAL
SERV
ICE
SPEC
IAL
SERV
ICE
1005
/100
0SE
RIES
1009
(41 / 2
,6)
1009
(21 / 2
,31 / 2
)
PROC
ESS
GAUG
ES
CODE DESCRIPTION PRESSURE GAUGE TYPE
STAINLESS STEEL CASE INDUSTRIAL GAUGESTEST & PROCESS GAUGES
COMMERCIAL GAUGES
NOTES: The options listed above are only a partial listing. For
other options on these or other pressure instruments please call
the factory for availability.(1) Available on 40mm and 50mm.(2)
Excludes type 1259.
Not all variations available for each size, connection, range in
a specific gauge, model/type; minimums may apply
XLL PLUS! PerformanceXSF FlutterGuard STDXNP Nickel Plated
SocketXBF WaII mounting bracketXFW Back flangeXFF Front flangeXUC
U-clamp STDXLJ Dry liquid-fillable gaugeXOS Overload stop STD STD
STD(1)
(2)
XVS Underload stop STD STD STD(1)
XTS Throttle screwXT(2) Throttle plug STDXS4 Slotted link
movement (decrease)XRJ Slotted link (increase)XAP Adjustable
pointerXMP Micrometer pointer STD STD STDXSH Red set hand
stationaryXEO Red set hand adjustableXEP Maximum pointerXEQ Minimum
pointerXPD Plastic window STD STD(1) STD STD STD STD STD STDXSG
Safety glassXMG Metric version gaugeXDA Dial markingXNN Paper
tagXNH Stainless steel tagXAB Absolute pressureXAJ 12% optional
accuracy STDXAN 1% optional accuracy STD STD STDXRA Retard scaleXWN
White dial STD STD STD STD STD STD STD STD STDXBD Black dialX6B
Oxygen-cleaned gauges (gaseous)XTB Tip bleedXED High and low
electric contactsXEE Double high-electric contactsXEF Double
low-electric contactsXEG Electric contacts off at low or
high and in-betweenXGV Silicone-filled gaugeXGX
Halocarbon-filled gaugeXCH Carrying handleXC4 Calibration Chart
1490
/149
5SE
RIES
1008
A/30
05/3
005P
1007
P
1005
/100
0SE
RIES
1100
1T
3-2-3%
2-1-2% 1.0%
0.25%0.5%
0.05
%Sp
an
0.10
%Sp
an
0.25
%Sp
an
0.5%
Span
1%Sp
an
1%at
0,2%
3/4
scal
e,5%
last
1/4
scal
e
2%,1
%,2
%
1.5%
Span
1.6%
Span
2%Sp
an
2%at
setp
oint
2.5%
Span
3%,2
%,3
%
3%up
scal
e,5%
dow
nsca
le
3.5%
5%Sp
an
23m
m
11 4
Inch
es
11 2
Inch
es,4
0m
m
2.0
Inch
es,5
0mm
2.5
Inch
es,6
3mm
3In
ches
3.5
Inch
es
4In
ches
,100
mm
4.5
Inch
es
6In
ches
,160
mm
8.5
Inch
es
12In
ches
Open
Fron
t
Solid
Fron
t
Ther
mos
etor
Ther
mop
last
icCa
se
Alum
inum
Stai
nles
sSt
eel
Blac
kM
etal
Alum
inum
Bron
ze/B
rass
Bery
llium
Copp
er/B
rass
Stee
l
316
Stai
nles
sSt
eel/C
arbo
nSt
eelS
ocke
t
316
Stai
nles
sSt
eel
Stai
nles
sSt
eel
Mon
el
Inco
nel
1 8NP
T
1 4NP
T
1 2NP
T
1 4Hi
ghPr
essu
re
Tri-C
lam
pTy
pe
Low
er
Back
In-L
ine
Inch
esof
Wat
er-i
ncl.
IWva
cuum
and
com
poun
d
0-60
0PS
I(in
clud
ing
vacu
um&
com
poun
d)
0-10
00PS
I(in
clud
ing
vacu
um&
com
poun
d)
0-60
00PS
I(in
clud
ing
vacu
um&
com
poun
d)
0-70
00PS
I(in
clud
ing
vacu
um&
com
poun
d)
0-10
,000
PSI(
incl
udin
gva
cuum
&co
mpo
und)
0-15
,000
PSI(
incl
udin
gva
cuum
&co
mpo
und)
0-20
,000
PSI(
incl
udin
gva
cuum
&co
mpo
und)
0-30
,000
PSI(
incl
udin
gva
cuum
&co
mpo
und)
0-1
00,0
00PS
I(in
clud
ing
vacu
um&
com
poun
d)
Abso
lute
0-1
IWID
to50
IWD
0-5
PSID
to15
0PS
ID
0-5
PSID
to10
0PS
ID
0-1
PSID
to60
PSID
0-1I
WD
to25
IWD
2089208620841084108212791377137924621259T5500T65001008S10091109101010171220
1020S10381339
1150H1122118711881189149014951125
1125A550355091127112811301131113211331134103210361001T1005
1005P1005S1000
1007P1008A2071A3005
3005P12MFX/15MFX12DDG/15DDG
23DDG40DDG/50DDG
ACCURACY
Seven Steps to Pressure Gauge Selection
DIAL SIZE CASESTYLE MATERIAL RANGEPROCESS MEDIA
(GAUGE WETTED PARTS)CONNECTION
SIZECONNECTION
LOCATION
MODELNUMBER
DIFF
EREN
TIAL
GAUG
ESCO
MM
ERCI
ALGA
UGES
STAI
NLES
SST
EEL
CASE
&IN
DUST
RIAL
GAUG
ESPR
OCES
SGA
UGES
TEST
GAUG
ES
SANITARYGAUGES
NOTE: Some model numbers may not be available in all sizes,
ranges and connections.
PRODUCTCATEGORY
BULLETIN G7
Ashcroft Inc., 250 East Main Street, Stratford, CT 06614 USATel:
203-378-8281 Fax: 203-385-0408email: [email protected]
www.ashcroft.com
All specifications are subject to change without notice.All
sales subject to standard terms and conditions. Ashcroft Inc.
2007
