Data Sheet
1259 Process Gauge
FEATURESn PLUS! ™ Performance (option) dampens vibration, shockand pulsation effects; provides liquid-fill performancein a dry gaugenAccuracy complies with ASME B40.100 Grade
2A (±0.5% of span)n Solid front safety case with pressure relief backn 4½˝ dial size
TYPICAL USESn Refineriesn Chemical, petrochemical plants and offshore oil rigs
n Water and wastewater pressure control
n Pulp and papern Mining and metals
n Equipment skids
n Specialized OEM equipment

12594½˝ dial sizeSPECIFICATIONS
Accuracy:±0.5% of span (ASME B40.100, Grade 2A)

Dial Size:

4½˝

Process Connection:¼ NPT Male, ½ NPT MaleRanges:

Vacuum to 20,000 psi

Case Style:

Solid front with pressure relief back

Movement:

Adjustable

Pointer:

Micrometer adjustable, aluminum
Dry Case: Case is not sealed and recommended
for weather protected environment only
Liquid filled or field fillable and Weatherproof: IP66
Hermetically Sealed: IP66
Stem, surface, remote
Liquid fill, throttle screw and pulsation dampener
PLUS! ™ Performance

Weather Protection:

Mounting:
Dampening Options:

KEY BENEFITS• Available with a wide range of diaphragm seals• Available with a large variety of instrument
assemblies

MIN/MAX TEMPERATURE LIMITS
VersionDry

WETTED COMPONENTS
Bourdon Tube

Process Connection

Joints

316L SS

316L SS

WeldedK-Monel® 500

Monel® 400

WeldedNON-WETTED COMPONENTS
CaseRing

WindowPressure Relief
Back

PBT
Polybutylene
terephthalate(Meets UL 94-V-0)

PBT
Polybutylene
terephthalate/polycarbonate(Meets UL 94-V-0)

Glass,
Safety glass,
Acrylic (OPT.)

PBT
Polybutylene
terephthalate(Meets UL 94-V-0)

AmbientProcess

Storage-20 °F to 200 °F -20 °F to 250 °F -40 °F to 250 °F(-29 °C to 93 °C) (-29 °C to 121 °C) (-40 °C to 121 °C)

PLUS! ™

-40 °F to 150 °F(-40 °C to 66 °C)-40 °F to 200 °F(-40 °C to 93 °C)-40 °F to 150 °F(-40 °C to 66 °C)

Glycerin Fill

20 °F to 150 °F(7 °C to 66 °C)

20 °F to 150 °F(7 °C to 66 °C)

0 °F to 150 °F(-18 °C to 66 °C)

Silicone Fill

-40 °F to 150 °F(-40 °C to 66 °C)-40 °F to 200 °F(-40 °C to 93 °C)-40 °F to 150 °F(-40 °C to 66 °C)

Note: Other than discoloration of the dial and hardening of the gasketing that may occur as ambientor process temperatures exceeds 150 °F, non-liquid-filled gauges with standard glass windows, canwithstand continuous operating temperatures up to 250 °F (121 °C). Liquid-filled gauges can withstand200° F (93 °C) but glycerin fill and acrylic window will tend to yellow. Accuracy at temperatures above
or below the reference ambient temperature of 68 °F (20 °C) will be affected by approximately 0.4% per
25 °F. Gauges with welded joints will withstand 750 °F (400 °C), 450 °F (232 °C) with silver brazed
joints for short times without rupture, although other parts of the gauge will be destroyed and calibration
will be lost. For continuous use and for process or ambient temperatures above 250 °F (121 °C),a diaphragm seal or capillary or siphon is recommended.

All specifications are subject to change without notice. All sales subject to standard terms and conditions.
Ashcroft®, DuraVis™, Plus!™ and Trust the Shield® are trademarks of Ashcroft Inc. The following
non-Ashcroft trademarks are the property of their respective owners: Monel®. For more information,
see Ashcroft Brands & Trademarks©2022 Ashcroft Inc. 1279_gauge_ds_RevK_11-02-22

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Data Sheet
1259 Process Gauge
ORDERING CODE

Example:451259451259 - 4½˝ Polybutylene terephthalate case, solid front (Meets UL 94-V-0)

451259SD02L

XC415#Dial Size/Model CodeSystem (tube and process connection)S - 316L Stainless steel tube and process connection

SP - K-Monel® 500 tube, Monel® 400 process connection
Case Design
D - DryD

L - Glycerin liquid filled (IP65)
Process Connection Sizes
02 - ¼ NPT Male

02

04 - ½ NPT Male
Process Connection Location
L - Lower

LOptions (If choosing an option(s) must include an “X”)

X__

SG - Safety glass
LJ - Hermetically sealed
LL - PLUS! ™ Performance
NZ - PLUS! ™ Performance, silicone free (dry gauges)
GV - Silicone filled case
NH - Stainless steel tag wired to case
6B - Cleaned for gaseous, oxygen service
D3 - DuraVis™ Retroreflective Dial (4½˝ and dry case only)
C4 - Traceable calibration certificate

C45G - Attach one accessory to gauge. Applicable to PL02 pressure limiting valve, V01, V02, V03 valves,
1098, 1100, 1198, 2198 siphons, 7001, 7004 needle valves, 1115 capillary, 1106 pulsation dampner,
1112, PD02 pressure snubbers, MDV swivel adapter, 2265 electric warning contact
Range (coding examples only, see range table on page 3 for all standard ranges)
Single Scales
15# - 15 psi

15#

1BR - 1 bar
1KG - 1 kg/cm2
100KP - 100 kPa
Dual Scales
2KG/# - 2 kg inner scale, 30 psi outer scale
When selecting a diaphragm seal or isolation ring, refer to the Min/Max Guide for compatibility with this gauge or scan the QR code to the right.

All specifications are subject to change without notice. All sales subject to standard terms and conditions.
Ashcroft®, DuraVis™, Plus!™ and Trust the Shield® are trademarks of Ashcroft Inc. The following
non-Ashcroft trademarks are the property of their respective owners: Monel®. For more information,
see Ashcroft Brands & Trademarks©2022 Ashcroft Inc. 1279_gauge_ds_RevK_11-02-22

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Data Sheet
1259 Process Gauge

Positive Pressure

CompoundVacuum

STANDARD PRESSURE RANGES
psibarkPa

mPa

kg/cm2

30IMV

N1BR

N100KP

N1MP

N1KG
N1/0.6KG–

N1/0.6BR

N100/60KP

0.1/0.06MP

V/15#

––––

–

N1/1.5BR

N100/150KP

N0.1/0.15MP

N1/1.5KG

V/30#

––––

–

N1/3BR

N100/300KP

N0.1/0.3MP

N1/3KG

V/60#

–––

–
N1/5KG–

N1/5BR

N100/500KP

N0.1/0.5MP

V/100#–––––

N1/9BR

N100/900KP

N0.1/0.9MP

N1/9KG

15#

1BR

100KP

0.1MP

1KG

20#

–––––

1.6BR

160KP

0.16MP

1.6KG

30#

–––––

2.5BR

250KP

0.25MP

2.5KG

60#

4BR

400KP

0.4MP

4KG

–

6BR

600KP

0.6MP

6KG

100#

––––

120#

–––––

10BR

1000KP

1MP

10KG

160#

––––

200#

–––––

16BR

1600KP

1.6MP

16KG

300#–––––

25BR

2500KP

2.5MP

25KG

400#

––––500#

––––

600#

40BR

4000KP

4MP

40KG

800#–––––

60BR

6000KP

6MP

60KG

1000#––––

1500#

100BR

10000KP

10MP

100KG

2000#––––
160KG–160BR

16000KP

16MP

3000#–––––

250BR

25000KP

25MP

250KG

4000#––––

5000#

––––

6000#

400BR

40000KP

40MP

400KG

8000#–––––

600BR

60000KP

60MP

600KG

10000#––––

15000#

1000BR

100000KP

100MP

1000KG

20000#----All specifications are subject to change without notice. All sales subject to standard terms and conditions.
Ashcroft®, DuraVis™, Plus!™ and Trust the Shield® are trademarks of Ashcroft Inc. The following
non-Ashcroft trademarks are the property of their respective owners: Monel®. For more information,
see Ashcroft Brands & Trademarks©2022 Ashcroft Inc. 1279_gauge_ds_RevK_11-02-22

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Data Sheet
1259 Process Gauge

DIMENSIONSFor reference only, consult Ashcroft for specific dimensional drawings

Dia. 5.37
BOLT CIRCLE

3.36

Dia. 5.81

Dia. 5.19

0.24
3X Dia.

2.63
3.98

0.62
ACROSS FLATS½ OR ¼ NPT

1.53

All specifications are subject to change without notice. All sales subject to standard terms and conditions.
Ashcroft®, DuraVis™, Plus!™ and Trust the Shield® are trademarks of Ashcroft Inc. The following
non-Ashcroft trademarks are the property of their respective owners: Monel®. For more information,
see Ashcroft Brands & Trademarks©2022 Ashcroft Inc. 1279_gauge_ds_RevK_11-02-22

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