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PRESSURE GAUGE
INSTALLATION,
OPERATION AND
MAINTENANCE

I&M008-10098-5/02 (250-1353-L) Rev
...
1
Range
...
2
Temperature
...
3
Media
...
4
Oxidizing media
...
5
Pulsation/Vibration
...
6
Gauge fills
...
7
Mounting
...
0
Temperature
2
...
4
2
...
4
2
...
4
2
...
4
2
...
5
2
...
5
3
...
1
Installation Location
...
2
Gauge reuse
...
3
Tightening of gauge
...
4
Process isolation
...
5
Surface mounting
...
6
Flush mounting
...
0
Operation
4
...
5
4
...
5
4
...
5
4
...
5
4
...
5
4
...
5
5
...
5
6
...
6
6
...
7
7
...
1
General
...
2
Installation
...
3
Operation
...
4
Maintenance
...
5
Failures
...
0
Dampening Devices
8
...
8
8
...
8
8
...
8
8
...
8
8
...
8
8
...
8
9
...
1
Pressure Instrument Testing Equipment
...
2
Tools & Tool Kits
...
3
Kits to Convert a Dry Gauge to a Liquid Filled or
...
9
9
...
10
Appendix
Type 1188 Bellows Gauge Calibration Procedure
...
12
Type 1009 Calibration Procedure (Pressure-Previous Style)
...
14
Type 1279 & 1379 I&M Liquid Fill Conversion Instruction
...
17-18
1
...

Chemiquip® is a registered trademark of Chemiquip Products Co
...


3

Glycerin satisfies most applications
...

Silicone filled gauges have a broader service range: –
40/250°F
...
Pointer motion will be
slowed at the low end of the low end of these temperature
ranges
...
7 Mounting – Users should predetermine how the gauge
will be mounted in service: stem (pipe), wall (surface) or panel
(flush)
...
See Section 3
...
0 SELECTION & APPLICATION
Users should become familiar with ASME B40
...
That document –
containing valuable information regarding gauge construction,
accuracy, safety, selection and testing – may be ordered from:
ASME International
Three Park Avenue
New York, N
...
10016-5990
800-843-2763 (US/Canada)
001-800-843-2763 (Mexico)
973-882-1170 outside North America
email: infocentral@asme
...
asme
...
0 TEMPERATURE
2
...

At very low temperatures, standard gauges may exhibit slow
pointer response
...
5% per 100°F
...
Unigauge models 21⁄2˝ and 31⁄2˝ 1009 and
1008S liquid filled gauges can withstand 200°F but glycerin
fill and the acrylic window of Duragauge® gauges will tend to
yellow
...

Low pressure, liquid filled Types 1008 and 1009 gauges may
have some downscale errors caused by liquid fill expansion
...
To do this the gauge must be
installed in the vertical position
...
For expected
long term service below –20°F (–30°C) Duragauge® and 41⁄ 2˝
1009 gauges should be hermetically sealed and specially
lubricated; add “H” to the product code for hermetic sealing
...
Standard Duralife®
gauges may be used to –50°F (–45°C) without modification
...
2 Accuracy – Heat and cold affect accuracy of indication
...
5% of full scale
change for every 40°F change from 75°F
...
Above 250°F there may exist very significant errors in
indication
...
3 Steam service – In order to prevent live steam from
entering the Bourdon tube, a siphon filled with water should
be installed between the gauge and the process line
...
If
freezing of the condensate in the loop of the siphon is a possibility, a diaphragm seal should be used to isolate the
gauge from the process steam
...
Super heated steam should have enough piping or
capillary line ahead of the siphon to maintain liquid water in
the siphon loop
...
4 Hot or very cold media – A five foot capillary line assembly will bring most hot or cold process media within the recommended gauge ambient temperature range
...
Improper application can be detrimental to the
gauge, causing failure and possible personal injury, property
damage or death
...
Additional information is available from Ashcroft Inc
...
1 Range – The range of the instrument should be approximately twice the maximum operating pressure
...
Too high a range may yield insufficient resolution for the application
...
2 Temperature – Refer to Section 2 of this manual for
important information concerning temperature related limitations of pressure gauges, both dry and liquid filled
...
3 Media – The material of the process sensing element must
be compatible with the process media
...

1
...
Gauges for oxygen service should be ordered to variation X6B and will carry the
ASME required dial marking “USE NO OIL” in red letters
...
They will be cleaned but carry no
dial marking
...

1
...

One exception to this is high frequency pulsation which is
difficult to detect
...
These applications should be
addressed with a liquid filled gauge, or in extreme cases, a
remotely mounted liquid filled gauge connected with a length
of capillary line
...
The Ashcroft 1106
pulsation dampener and 1112 snubber are auxiliary devices
which dampen pulsation with less tendency to plug
...
6 Gauge fills
...


4

750°F (400°C) the customers should use their own small
diameter piping to avoid possible corrosion of the stainless steel
...
) The capillary and gauge must be
cleaned for oxygen service
...

2
...
Diaphragm seals are offered in a wide variety
of designs and corrosion resistant materials to accommodate almost any application and most connections
...
ashcroft
...

2
...
Gauges
equipped with polysulfone windows will withstand more autoclave cycles than those equipped with polycarbonate windows
...
Gauge cases should be
vented to atmosphere (removing the rubber fill/safety plug if
necessary) before autoclaving to prevent the plastic window
from cracking or excessively distorting
...


4
...
1 Frequency of inspection – This is quite subjective and
depends upon the severity of the service and how critical the
accuracy of the indicated pressure is
...
Annual inspections, or even less frequent schedules, are often employed in non-critical applications
...
2 In-service inspection – If the accuracy of the gauge
cannot be checked in place, the user can at least look for (a)
erratic or random pointer motion; (b) readings that are suspect – especially indications of pressure when the user
believes the true pressure is 0 psig
...

4
...
Even if the gauge is not showing any symptoms of
abnormal performance, the user may want to establish a frequency of bench type inspection
...
4 When to recalibrate – This depends on the criticality of
the application
...
5% beyond specification, the user must
decide whether it’s worth the time and expense to bring the
gauge back into specification
...
25% test gauge is found to be 0
...

4
...

4
...


3
...
1 Location – Whenever possible, gauges should be located to minimize the effects of vibration, extreme ambient temperatures and moisture
...
) are preferred
...

3
...
100 recommends that
gauges not be moved indiscriminately from one application
to another
...
This will also minimize the possibility of a
reaction with previous media
...
3 Tightening of gauge – Torque should never be applied
to the gauge case
...

NPT threads require the use of a suitable thread sealant,
such as pipe dope or teflon tape, and must be tightened very
securely to ensure a leak tight seal
...
Always apply torque only to the wrench flats on the
lower seal housing when installing filled, diaphragm seal
assemblies or removing same from process lines
...
4 Process isolation – A shut-off valve should be installed
between the gauge and the process in order to be able to
isolate the gauge for inspection or replacement without shutting down the process
...
5 Surface mounting – Also known as wall mounting
...
The gauge case
mounting feet, if applicable, will ensure clearance between the
pressure relieving back and the mounting surface
...
6 Flush mounting – Also known as panel mounting
...
ashcroft
...
0 GAUGE REPLACEMENT
It is recommended that the user stock one complete
Ashcroft® instrument for every ten (or fraction thereof) of that
instrument type in service
...
Gauges in this category include
the following:
a
...
It is
possible the Bourdon tube has suffered thinning of its
walls by corrosion
...
Gauges that exhibit a zero shift greater than 25%
...

c
...

d
...

e
...


5

f
...

g
...

h
...

NOTE: ASME B40
...
This policy is prudent in that
it encourages the user to procure a new gauge, properly tailored by specification, to each application that arises
...
100 recommends that known pressure (based on the reading from the pressure standard used)
be applied to the gauge under test
...
The practice of aligning the pointer of the
gauge under test with a dial graduation and then reading the
error from the master gauge (“reverse reading”) can result in
inconsistent and misleading data and should NOT be used
...
Plotting
the individual errors (Figure 1) makes it possible to visualize
the total gauge characteristic
...
“Rap” means lightly tapping the gauge before reading to remove friction as
described in ASME B40
...

Referring to Figure 1, several classes of error may be seen:
Zero – An error which is approximately equal over the entire
scale
...
0 ACCURACY: PROCEDURES/DEFINITIONS
Accuracy inspection – Readings at approximately five
points equally spaced over the dial should be taken, both
upscale and downscale, before and after lightly rapping the
gauge to remove friction
...

Equipment – A finely regulated pressure supply will be required
...
The gauge under test should be positioned as it will
be in service to eliminate positional errors due to gravity
...
1

INDICATED VALUE (PSI)
True Value –
PSI
0
40
80
120
160
200

Increasing –
Without RAP
–
...
8
+
...
4
–
...
4

Increasing –
With RAP
0
+1
...
5
–1
...
5
+
...
4
+1
...
2
+
...
6
+
...
1
+1
...
6
+
...
4

ERROR (% OF FULL SCALE)
True Value –
Increasing –
% of Range
Without RAP
0
–
...
40
40
+
...
20
80
–
...
20

Increasing –
With RAP
0
+
...
25
–
...
25
+
...
20
+
...
60
+
...
30
+
...
55
+
...
30
+
...
20

1
...
5

■

Error (% of Full Scale)

▲

●

◆
■
●
▲

◆
■

0
...
5

▲

▲ upscale – without rap

●

● upscale – with rap

◆
■

◆ downscale – without rap
■ downscale – with rap

–1
...
This error may often be corrected by simply
repositioning the pointer
...

Span – A span error exists when the error at full scale pressure is different from the error at zero pressure
...
Most Ashcroft
gauges are equipped with an internal, adjusting mechanism
with which the user can correct any span errors which have
developed in service
...
The Ashcroft Duragauge®
pressure gauge is equipped with a rotary movement feature
which permits the user to minimize this class of error
...
g
...

Hysteresis – Some Bourdon tubes have a material property
known as hysteresis
...
This
class of error can not be eliminated by adjusting the gauge
movement or dial position
...
Possible causes of friction are burrs or foreign material
in the movement gearing, “bound” linkages between the
movement and the bourdon tube, or an improperly tensioned
hairspring
...

6
...
Many times
gauges are simply “off zero” and a simple pointer adjustment
using the micrometer pointer is adequate
...
Remove ring, window and, if solid front case, the rear
closure assembly
...
Pressurize the gauge once to full scale and back to zero
...
Refer to Figure 2 (Ashcroft System Assembly w/Rotary
Gear Movement) for a view of a typical Ashcroft rotary
system assembly with component parts identified
...
2A ASHCROFT TYPE 1259 SYSTEM ASSEMBLY

TIP

HAIRSPRING
LINK

MOVEMENT

BACKPLATE
SOCKET

Figure 2A for link configuration of Type 1259 gauge
...
Adjust the micrometer pointer so that it rests at the true
zero position
...

e
...
With open front gauges, ideal span (270
degrees) will exist when at full scale pressure the pointer
rests exactly at the 6:00 o’clock position
...
If the span has shifted significantly (span error greater
than 10%), the gauge should be replaced because there
may be some partial corrosion inside the Bourdon tube
which could lead to ultimate failure
...
25%, loosen the lower link screw and move
the lower end of the link toward the movement to
increase span or away to decrease span
...
004 inch will change the span by approximately 1%
...

g
...
Even
though the gauge is accurate at zero and full scale, it
may be inaccurate at the midpoint
...
For corrections to linearity with the Type 1259
FIG
...
2 ASHCROFT SYSTEM ASSEMBLY W/ROTARY GEAR MOVEMENT

SEGMENT
TIP

LINK

BACKPLATE

BOURDEN TUBE

To increase pointer indication
at mid-scale, use a pliers to
open the link
...


PINION

gauges refer to Figure 2B
...
Rotating the movement one degree will change this error by approximately
0
...
Rotating the movement often affects span and it
should be subsequently rechecked and readjusted if necessary according to step 6
...
1f
...
While recalibrating the gauge, the friction error – difference in readings taken with and without rap – should be

ROTARY MOVEMENT

SOCKET

7

noted
...
If the friction error is excessive, the movement should be replaced
...
The
hairspring torque,or tension, must be adequate without
being excessive
...

NOTES:
1 For operation of test gauge external zero
reset, refer to page 17
...


7
...
Process
media build-up on the process side of the diaphragm can
also require seal cleaning or replacement
...


WARNING: All seal components should be selected
considering process and ambient operating conditions to
prevent misapplication
...


8
...
1 General – Some type of dampening device should be
used whenever the pressure gauge may be exposed to
repetitive pressure fluctuations that are fairly rapid, high in
magnitude and especially when transitory pressure spikes
exceeding the gauge range are present (as with starting and
stopping action of valves and pumps)
...
The dampener reduces the magnitude of the pressure pulse thus
extending the life of the Bourdon tube and movement
...
If the orifice is very small the pointer may indicate the
average service pressure, with little or no indication of the
time varying component of the process pressure
...
g
...

Highly viscous media and media that tend to periodically
harden (e
...
, asphalt) require a diaphragm seal be fitted to
the gauge
...

8
...
They have the advantage of fitting completely within the gauge socket and come in three
types: (a) a screwed-in type which permits easy removal for
cleaning or replacement; (b) a pressed in, non-threaded
design and (c) a pressed in, threaded design which provides
a highly restrictive, helical flow path
...

8
...
Unlike a simple throttle screw/plug, this device has a self-cleaning action in that
the pin moves up and down under the influence of pressure
fluctuations
...
4 Ashcroft Pressure Snubber – The heart of the Type
1112 pressure snubber is a thick porous metal filter disc
...

8
...
These
devices, in the event of plugging, can easily be opened to
allow the pressure fluid to clear away the obstruction
...
6 Chemiquip® Pressure Limiting Valves – Model PLV255, PLV-2550, PLV-5460, PLV-5500 and PLV-6430, available with and without built-in snubbers, automatically “shut
off” at adjustable preset values of pressure to protect the
gauge from damage to overpressure
...
0 DIAPHRAGM SEALS
7
...
The
space between the diaphragm and the instrument’s pressure
sensing element is solidly filled with a suitable liquid
...
When diaphragm seals are used with pressure
gauges, an additional 0
...

Used in a variety of process applications where corrosives,
slurries or viscous fluids may be encountered, the diaphragm
seal affords protection to the instrument where:
• The process fluid being measured would normally clog
the pressure element
...

• The process fluid might freeze due to changes in ambient
temperature and damage the element
...
2 Installation – Refer to bulletin OH-1 for information
regarding (a) seal configurations; (b) filling fluids; (c) temperature range of filling fluids; (d) diaphragm material pressure
and temperature limits; (e) bottom housing material pressure
and temperature limits; (f) pressure rating of seal assembly;
(g) accuracy/temperature errors of seal assembly; (h)
diaphragm seal displacement
...

It is imperative that the pressure instrument/diaphragm seal
assembly be properly filled prior to being placed in service
...
Refer to section
3
...

7
...

Should the pressure instrument fail, or be removed accidentally or deliberately, the diaphragm will seat against a matching surface preventing damage to the diaphragm or leakage
of the process fluid
...
4 Maintenance – Clamp type diaphragm seals – Types
100, 200 and 300 – allow for replacement of the diaphragm
or diaphragm capsule, if that ever becomes necessary
...
With all three types the clamping arrangement allows
field disassembly to permit cleaning of the seal interior
...


9
...
ashcroft
...
1 Pressure Instrument Testing Equipment
Type 1305D Deadweight Tester
Type 1327D Pressure Gauge Comparator
Type 1327CM “Precision” Gauge Comparator
9
...
3 Kits to Convert a Dry Gauge to a Liquid Filled or
Weather Proof Case Gauge
Type 1280 conversion kit for 41⁄2˝ lower connect
1279/1379
Type 1283 conversion kit for 41⁄2˝ back connect
1279/1379
Type 1284 conversion kit for 6˝ lower & back connect

TYPE 1105
TOOL KIT

TYPE 3220
HAND JACK SET

9

9
...


Pointer Puller Screw/Pin(2)(3)(4)

112A381-01

Pointer Puller Body(2)(3)(4)

292A133-01

Pointer Staker

188A101-01

(2)(4)

Span Wrench(2)(5) (to adjust span)

266A137-01

Ring Wrench 31⁄2˝(1)(5) (for ring removal) (35 1009)

266B134-01

Ring Wrench 21⁄2˝(1)(5) (for ring removal) (25 1009)

266B135-01

Nest 21⁄2˝ & 31⁄2˝(1)(5) (to hold gauge for ring removal) (25/35 1009)

266B136-01

Ring Removal Tool

(25 1009)

101B221-02

Ring Removal Tool(6) (35 1009)

101B221-01

Nest 21⁄2˝(6) (to hold gauge for ring removal) (25 1009)

101B220-02

Nest 31⁄2˝(6) (to hold gauge for ring removal) (35 1009)

101B220-01

(6)

Type 1230 throttle plug insertion (1⁄4 NPT) for 1009 Duralife®)

1230

Type 1231 throttle plug insertion ( ⁄2 NPT) for 1009 Duralife (body only)
Tool to open orifice on push-in throttle plug
(1)
(2)
(3)
(4)
(5)
(6)

1231
101A206-01

®

1

Formerly 1206T Tool Kit
...

Both parts must be purchased together
...

Previous design only
...


RING WRENCH
266B134-01

RING REMOVAL TOOL
101B221-01
NEST
101B220-02

RING REMOVAL TOOL
101B221-02

NEST
266B136-01

POINTER STAKER
188A101-01

POINTER PULLER
SCREW/PIN 112A381-01
and

RING
WRENCH
266B135-01

POINTER PULLER BODY
292A133-01

NEST
101B220-01

SPAN WRENCH
266A137-01

10

ASHCROFT® Type 1188 Bellows Gauge
Calibration Procedure

CALIBRATION & TROUBLE
CORRECTION DIAGRAM

RANGE SPAN ADJUSTMENT

RANGE TOO SHORT
Adjust slide “S” inward

POINTER JUMPING

STICKY PARTS
Clean all bearings
and gear teeth

RANGE TOO LONG
Adjust slide “S” outward

NOTE: After adjusting range span, set both movement stops
...
Set the overload stop so that the pointer will pass
the maximum range approximately 5˝
...


LOOSE HAIRSPRING
Remove backlash by
disengaging pinion &
rotate to tighten

COUNTER BALANCE
RUBBING
Bend if necessary to
clear socket in travel

SLUGGISH MOVEMENT

TIGHT HAIRSPRING
Loosen by disengaging pinion & rotate
NON LINEAR

NON LINEAR
FIRST 3RD
...


ADJ
...
ANGLE OF PULL
BY DECREASING ANGLE “A”

NOTE: To increase or decrease angle “A,“ bend tip inward or outward as
required
...
This can be corrected by cutting off one end off the link “E”
decreasing its length, or makin a new length from
...
phos
...

Caution: When reproducing link end, follow figure 44 very closely
...

OVERLOAD
STOP

REF: Replacing System Bellows
After assembling bellows to the gauge socket securely, subject system to 30 psi for five minutes, allowing bellows to travel approximately 1/8˝ against the overload stop
...


UNDERLOAD
STOP

SLIDE AND LINK (angle “A”)
Enlarged view of slide and link

60°

E (LINK)


...
, 250 E
...
, Stratford, CT 06614-5145, Tel: 203-378-8281, Fax: 203-385-0499, www
...
com
All sales subject to standard terms and conditions of sale
...
Remove ring, window and gasket pointer
...
recheck accuracy at 15 and 25˝ Hg vac
...


2
...


16
...


3
...


Figure 2 –

4
...

5
...
mark on the flange
...
Release vacuum fully
...
Note agreement of pointer to zero mark on flange
...
If span is high or low, turn span block as shown in
Figure 1
...

Span Block

For models produced prior to
September 2008 for 21⁄2˝ version and
December 2008 for 31⁄2˝ version
...


0
Increase

Decrease

7/64 Open
End Wrench

9
...

10
...

11
...

12
...
and note accuracy of indication
...

13
...

14
...


© 2010 Ashcroft Inc
...
ashcroft
...
I&M008-10077 9/01 AMR 05/10

12

ASHCROFT® Previous Type 1009 Duralife®
Calibration Procedure – Pressure Range

Step 1
...


Step 5
...

Step 6
...
If not, remove pointer
and dial and return to step 1, Figure 4
...
Go to mid-scale pressure…rotate dial until midscale mark is aligned with pointer, Figure 4
...
Tighten dials screws and stake on pointer
...
Check zero and full scale
...

Notes: See page 10 for any tools required to calibrate
...

Back of gauge will have a date code sticker
...
Go to full scale pressure…rotate span block with
tool until pointer rests at 6 o’clock
...
Go to zero pressure (9 o’clock)…if pointer has not
moved away from start point, go to Step 4
...

Step 4
...


Figure 4 –

Mid Scale Mark

Full Scale Mark

Dial Screws
Zero Box

© 2010 Ashcroft Inc
...
ashcroft
...
I&M008-10077 9/01 AMR 05/10

13

ASHCROFT® Current Type 1009 Duralife®
Calibration Procedure – Pressure and
Vacuum Range
Calibration – 1009 Duralife® Gauge –
Inspect gauge for accuracy
...
If this is not adequate and inspection shows that
the gauge warrants recalibration to correct zero, span
and/or linearity errors, proceed as follows:
Remove ring, window, and gasket using Ashcroft Ring
Removal Tools P/N 101B220-02 and 101B221-02 for 2½”
gauges and 101B220-01 and 101B221-01 for 3½” gauges
...
Vent to 0 pressure and check pointer position in the
zero box
...

Clockwise rotation moves pointer clockwise, counterclockwise rotation moves the pointer counterclockwise
...
Repeat step 1 and 2 until 0 and 25 inches of Hg are
within gauge tolerance
...
Apply 15 inches Hg vacuum
...
If not loosen the dial screw
and rotate dial left or right to adjust midpoint
...

6
...

7
...

Re-assemble window and ring to gauge:
a
...
Align the tabs of
the window with the tabs of the case front
...

b If safety glass is used, reinstall window, gasket, and
ring
...

Note: Tighten ring: Apply 120-200inlb of torque
...
Warning: over tightening of safety glass may induce cracking
...
Adjust pointer with a slotted screwdriver until it is in the
center of the zero box
...

2
...
If error exceeds 1% rotate
the black span adjustment device with a #0 square
drive bit
...

3
...
If not, repeat step 1 and 2
4
...

5
...
If not
loosen the dial screw and rotate dial left or right to
adjust midpoint
...

6
...

Vacuum Range –
1
...
This is often all that is
required it correct calibration issues
...
Apply 25 inches Hg vacuum
...


Notes: See page 10 for any tools required to calibrate
...

Back of gauge will have a date code sticker
...
, 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: 203-378-8281, Fax: 203-385-0499, www
...
com
All sales subject to standard terms and conditions of sale
...
101A202-01 101A203-01

1280

1283

1284

1
1
1
1
2
1
1
1
1

1
1
2(1-LC:1-BC)
2(1-LC:1-BC)
2
1
1
1
–

QUANTITY INCLUDED

ACRYLIC WINDOW
FRONT O-RING
DIAPHRAGM(1)
REAR COVER
COVER SCREWS
THROTTLE SCREWS
GARTER SPRING
FILL IDENTIFICATION
THREADED RING
TOP FILL PLUG

1
1
1
1
4
2
–
1
–
–

1
1
1
1
4
2
1
1
–
–

1
1
1
1
2
1
1
1
1

1
...
Consult factory for part number
...
12 psi

...

Liquid-filled gauges can withstand 200°F (93°C) but glycerin fill and acrylic window will
tend to yellow
...
4% per 25°F
...
For
continuous use and for process or ambient temperatures above 250°F (121°C), a
diaphragm seal or capillary or siphon is recommended
...
Unscrew front threaded ring (turn CCW)
...
For range
spans 60 psi and under, shift pointer down
scale by the amount shown in the table
...

2
...

Assemble window in gauge
...
Moisten face of threaded ring with silicone oil
or silicone grease where ring bears up against
window
...
See instructions on
reverse side for applying proper torque to ring
to establish desired squeeze on O-ring seal
...
4)
...

4
...

Note: Disregard Step Nos
...

When converting a 45-1379 with the top fill
hole configuration, p/n 256A176-01 fill plug is
required and must be ordered separately
...
Filling Procedures:
a
...
Tipping of the
gauge is necessary so fluid will flow into

© 2015 Ashcroft Inc
...
ashcroft
...
All rights reserved
...
Pour in fill liquid to
within about 1⁄16 inch of rear seal lip
...

Remove 3⁄8 inch block and pour in liquid
until level is about 1⁄16 inch below rear sealing lip
...
, as in Step No
...
Then fill the
rear of the gauge
...

b
...
) Place gauge face
down and insert a 1⁄8 inch diameter tube,
connected to a vacuum pump, through the
12 o’clock position hole in the rear, solid
front portion of the case (see Fig
...

Evacuate the air from the front dial cavity
while pouring in the fill fluid through the
case back
...
When the dial cavity is solidly
filled, remove the tubing and continue to
pour the fill fluid to within 1⁄16 inch BELOW
the O-ring channel lip
...
For reference,
amount of fill is approximately
400 ml
...
(41⁄2˝ GA
...
or 16 fluid oz
...

c
...

6
...

For back connection gauges see instructions
on reverse side
...
2/4)
...
For 1279:
Assemble rear cover and six self tapping
screws in a criss-cross pattern and torque to
12 in lbs
...
)
For 1379:
- Thread rear ring and torque to 200 in lbs
- Install stainless steel back cover using
two screws
...

(±2 in lbs
...
Assemble throttle screw to threaded hole in
socket
...

9
...

10
...
Include enclosed instruction sheet inside
carton
...
Change type number on carton label to:
(1) Hermetically Sealed – 1279(*)SH
...

*Bourdon Tube System Code
Glycerin or silicone should not be used in applications involving Oxygen, Chlorine, Nitric Acid,
Hydrogen Peroxide or other strong oxidizing
agents, because of danger of spontaneous chemical reaction, ignition or explosion
...
Products with this fill can be
ordered from factory
...
Consult the factory
before filling with any other fluid
...
2
REAR COVER

Garter Spring & Diaphragm Assembly
(Back Connection Gauge Only)

DIAPHRAGM

A
...

B
...

C
...

Diaphragm O-ring must be completely in socketshank grove
...
Place garter spring over cone as shown and slide
onto diaphragm in socket grove
E
...

Front Ring Assembly (All Gauges)
A
...

B
...
Use 1⁄2˝ drive extension and torque ring to 200 in
...
3

Fig
...
4

Alternate Method
A
...
Mark case and ring
...
Turn ring another 100 to 120 degrees (slightly
less than 1⁄2 turn) using the ring wrench and 1⁄2˝
drive socket wrench or place the blunt end of a
wooden or plastic dowel against a ring lug and
tap with a hammer
...
5

A
...

B
...

The vacuum will displace the air with fluid
...
When the dial cavity is solidly filled, remove the
tubing and continue to pour the fill fluid to within
1
⁄16 ˝ below the o-ring channel lip, as shown
...
When converting a 45-1379 with the top fill hole
configuration, p/n 256A176-01 fill plug is
required and must be ordered separately
...

Hg for plain glass and safety glass
...
, 250 East Main Street, Stratford, CT 06614 USA, Tel: 203-378-8281, Fax 203-385-0402 www
...
com
All sales subject to standard terms and conditions of sale
...
I&M008-10090 (84B276) Rev 10/15

16

VACUUM
PUMP

ASHCROFT® Type 1082 Test Gauge
Calibration Procedure – Pressure Range

INSTRUCTIONS FOR USE OF EXTERNAL
EASY ZERO™ ADJUST FEATURE*

Fig
...
LOOSEN RING-LOCKING SCREW A
...
OBTAIN REQUIRED ADJUSTMENT BY
ROTATING KNOB B CLOCKWISE OR
COUNTER-CLOCKWISE
...
TIGHTEN SCREW A DOWN ON KNOB B
...


ADDITIONAL
CALIBRATION INSTRUCTIONS
1) “Standards shall have nominal errors no greater than
1
⁄4 of these permitted for the gauge being tested
...
(i
...
Do not use a
400psi standard to test a 15psi gauge
...
At each test point the
gauge shall be
...
”
(Ref: ASME B40
...
2
...
1)
4) To read gauge indication, move eye over red pointer
tip at OD of printed dial until red reflection in mirror
band is no longer visible, and then read the pointer
position in reference to the dial
...
, 250 E
...
, Stratford, CT 06614-5145, Tel: 203-378-8281, Fax: 203-385-0499, www
...
com
All sales subject to standard terms and conditions of sale
...
THE FLOW CHART BELOW OUTLINES THE
RECOMMENDED CALIBRATION PROCEDURE

Fig
...
2 <1
...
5%
COARSE
SPAN

<0
...
2%

CHECK
ACCURACY

GO TO
0%

<0
...
2%

CHECK
ACCURACY

COARSE
SPAN

>1
...
2<1
...
5%

<0
...
2<1
...
5%

<0
...
004 IN
...
1%)
–TIGHTEN TWO SCREWS

TEMPERATURE
COMPENSATOR
< – LESS THAN
> – GREATER THAN

MICROSPAN
ADJUSTMENT
–TIGHTEN SCREW TO
INCREASE SPAN
1 TURN – APPROX
...
5mm hex
Ball end wrench or
screwdriver required
...
, 250 E
...
, Stratford, CT 06614-5145, Tel: 203-378-8281, Fax: 203-385-0499, www
...
com
All sales subject to standard terms and conditions of sale
...
,
250 East Main Street
Stratford, CT 06614-5145
U
...
A
...
com
www
...
com
I&M008-10098-5/02 (250-1353-L) Rev
...
ashcroft

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