NOSHOK, Inc. - Type 25/25H Standard and Elevated Pressure, Non-Replaceable Diaphragm Seals

Designed to isolate the pressure measuring instrument from corrosive or viscous process media
Utilize an all welded, all metallic housing design to eliminate potential leak paths
For use with gauges with dial sizes of 2-1/2" and smaller, and pressure ranges no less than 100 psig
Housing and diaphragm offered in a variety of materials to suit most applications
A flushing port is available to clean wetted areas and prevent process media build up

Request Information

Unit of Measure

Items	25-02S-S-02S 1/4" National Pipe Thread (NPT) Instrument Connection, 316 Stainless Steel, 1/4" National Pipe Thread (NPT) Process Connection, 316 Stainless Steel Type 25 Seal with 316 Stainless Steel Diaphragm	25-02S-S-02S-1F 1/4" National Pipe Thread (NPT) Instrument Connection, 316 Stainless Steel, 1/4" National Pipe Thread (NPT) Process Connection, 316 Stainless Steel, 1/8" National Pipe Thread (NPT) Flushing Connection Type 25 Seal with 316 Stainless Steel Diaphragm	25-02S-S-04S 1/4" National Pipe Thread (NPT) Instrument Connection, 316 Stainless Steel, 1/2" National Pipe Thread (NPT) Process Connection, 316 Stainless Steel Type 25 Seal with 316 Stainless Steel Diaphragm	25H-02S-S-02S 1/4" National Pipe Thread (NPT) Instrument Connection, 316 Stainless Steel, 1/4" National Pipe Thread (NPT) Process Connection, 316 Stainless Steel Type 25H Seal with 316 Stainless Steel Diaphragm
Description	N/A Designed to isolate the pressure measuring instrument from corrosive or viscous process media Utilize an all welded, all metallic housing design to eliminate potential leak paths For use with gauges with dial sizes of 2-1/2" and smaller, and pressure ranges no less than 100 psig Housing and diaphragm offered in a variety of materials to suit most applications A flushing port is available to clean wetted areas and prevent process media build up
Type	N/A Diaphragm Seal
Style	N/A Non-Replaceable Diaphragm Seal
Instrument Connection Size	N/A 1/4 in
Upper Housing Material	N/A 316 Stainless Steel
Diaphragm Material	N/A 316 Stainless Steel
Process Connection Size	N/A 1/4 in	N/A 1/4 in	N/A 1/2 in	N/A 1/4 in
Flushing Connection Size	N/A	N/A 1/8 in	N/A	N/A
Flushing Connection Type	N/A	N/A National Pipe Thread (NPT)	N/A	N/A
Process Connection	N/A National Pipe Thread (NPT)
Seal Type	N/A Threaded with welded diaphragm
Lower Housing Connection Size	N/A 1/4 in1/2 in3/4 in1 in1-1/4 in1-1/2 in
Lower Housing Connection Type	N/A National Pipe Thread (NPT)
Lower Housing Flushing Port	N/A Optional 1/8" NPT and 1/4" NPT
Instrument Type	N/A Gauges, Transducers, Switches
Instrument Gauge Size	N/A 2-1/2 in
Pressure [Min] for Gauges 2-1/2 in. Size	N/A 0 to 100 psig
Pressure [Min] for Transducers	N/A 0 to 60 psig
Pressure [Min] for Switches	N/A 0 to 60 psig
Pressure [Max] for Gauges 2-1/2 in. Size	N/A 0 to 2,500 psig
Pressure [Max] for Transducers	N/A 0 to 2,500 psig
Pressure [Max] for Switches	N/A 0 to 2,500 psig
Upper Housing Type	N/A Non-Continuous Duty
Diaphragm Size	N/A 1.28 in
Diaphragm Displacement	N/A 400 mm³
O-Ring Temperature Limits for Nitrile Butadiene Rubber (NBR) Material	N/A -40 to 250 ºF
O-Ring Temperature Limits for Polytetrafluoroethylene (PTFE) Material	N/A -400 to 400 ºF
O-Ring Temperature Limits for Fluorocarbon (FKM) Material	N/A -10 to 400 ºF
Diaphragm Pressure Limits for Polytetrafluoroethylene (PTFE) Material	N/A 2,000 psi
Diaphragm Pressure Limits for Fluorocarbon (FKM) Material	N/A 2,000 psi
Diaphragm Temperature Limits for Polytetrafluoroethylene (PTFE) Material	N/A -40 to 400 ºF
Diaphragm Temperature Limits for Fluorocarbon (FKM) Material	N/A -10 to 400 ºF
Note for Diaphragm Pressure and Temperature Limits	N/A Metallic diaphragms determined by pressure range of seal type, restricted to temperature range of fill fluid.
Maximum Pressure Limits for Glass Transition Temperature (Tg), Tetoron Cotton (TC) Bottom Housing Material	N/A 200 psi
Maximum Pressure Limits for Polyvinylidene Fluoride (PVDF) Bottom Housing Material	N/A 200 psi
Maximum Pressure Limits for Polyvinyl Chloride (PVC) Bottom Housing Material	N/A 80 psi125 psi200 psi
Maximum Pressure Limits for Polypropylene (PP) Bottom Housing Material	N/A 200 psi
Maximum Temperature Limits for Glass Transition Temperature (Tg), Tetoron Cotton (TC) Bottom Housing Material	N/A 150 ºF
Maximum Temperature Limits for Polyvinylidene Fluoride (PVDF) Bottom Housing Material	N/A 180 ºF
Maximum Temperature Limits for Polyvinyl Chloride (PVC) Bottom Housing Material	N/A 74 ºF125 ºF150 ºF
Maximum Temperature Limits for Polypropylene (PP) Bottom Housing Material	N/A 140 ºF
Note for Maximum Pressure and Temperature Limits Bottom Housing Material	N/A Metallic lower housings determined by pressure range of seal type, restricted to temperature range of fill fluid.
Instrument Connection Type	N/A National Pipe Thread (NPT)
Warranty	N/A 1 yr
Application	N/A Water and wastewater Oil and gas Petrochemical Chemical processing Industrial automation Marine Agriculture Steel fabrication Mud pumping Pulp and paper Pneumatic
Additional Information	N/A Consider instrument size, pressure range, media composition, ambient and operating temperature, and maximum working pressure when selecting Capillaries and cooling elements are available for elevated process temperatures, see options & accessories below Fill fluid must be compatible with process media; i.e. Glycerin may become volatile in conjunction with a strong oxidizing agent such as chlorine, forms of oxygen or peroxide and nitric acids
Prop 65 Warnings	N/A WARNING: This product can expose you to chemicals including Nickel, which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov
Limitations Which Apply Are	N/A These units must be operated within the catalogued environmental and application parameters. Determination of failure will be made by NOSHOK, Inc.'s equipment and personnel or a certified test facility specializing in this type of evaluation. Gauge failures determined to be caused by over-range, incompatibility with environment or product media and abuse will not be considered under this warranty. NOSHOK, Inc. will, at its discretion, repair or replace the working parts of the damaged gauge without cost to the customer. In keeping with and for purposes of product and/or manufacturing process improvements, NOSHOK, Inc. reserves the right to make design changes without prior notice.
Cooling Elements	N/A 1/4" NPT x 1/4" NPT Cooling Element (1/4" NPT x 1/4" NPT-CE) 1/2" NPT x 1/2" NPT Cooling Element (1/2" NPT x 1/2" NPT-CE) Works in combination with diaphragm seal to isolate instrument from high media temperatures Recommended for process temperatures above 212 ºF Requires direct mounted system Effective temperature reductions of 200 ºF depending upon ambient conditions High > 212 ºF process temperature, low < -40 ºF process temperature All Stainless Steel construction
Diaphragm Seal Fill Options	N/A Glycerin (GY) Not recommended for use in vacuum applications.) Silicone (SL) Halocarbon® (HL) Neobee M20 (NB) Mineral Oil (MO) Propylene Glycol (PG)
Distribution Manifolds	N/A NOSHOK's Distribution Manifolds connect multiple instruments to one diaphragm seal, eliminating multiple connections that lead to possible leak paths.
Plain and Armored Capillaries	N/A 5 ft. SS Armored Flexible Capillary, 1/4" NPT (AC-02-02-5) per ft. adder (AC-02-02-#) 5 ft. SS Armored Flexible Capillary, 1/2" NPT (AC-04-04-5) per ft. adder (AC-04-04-#) Stainless Steel capillaries available with or without Stainless Steel armor Protects the instrument from high or low process temperatures Allows remote mounting of pressure instrument(s) Select the shortest capillary length possible, as changes in ambient temperature conditions may significantly affect the accuracy and response time of the instrument Standard length 5', others available Installation on analog gauges requires a gauge support and gauge adaptor, or other surface mounting provisions Any level difference between the instrument and the seal will result in a pressure indication error; make sure to compensate for the level difference during calibration of the diaphragm seal assembly if the level difference is known Filling options for capillaries Silicone - specify to 10 or 20 feet (SL-C) Halocarbon® - specify to 10 or 20 feet (HL-C)
Stock	N/A Yes