25H Standard & 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 - 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 accessories - 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
ORDERING INFORMATION
| TYPES | 25 | (2,500 psi) | 25H | (5,000 psi) | ||
| INSTRUMENT CONNECTION SIZES | 02 | 1/4″ NPT | 04 | 1/2″ NPT | ||
| UPPER HOUSING MATERIALS | M | Monel 400 | P | Carpenter 20 | S | 316 Stainless steel |
| DIAPHRAGM MATERIALS | H | Hastelloy C-276 | P | Carpenter 201 | ||
| M | Monel 4001 | S | 316 Stainless steel | |||
| PROCESS CONNECTION SIZES | 02 | 1/4″ NPT | 04 | 1/2″ NPT | ||
| LOWER HOUSING MATERIALS | H | Hastelloy C-276 | P | Carpenter 20 | ||
| M | Monel 400 | S | 316 Stainless steel | |||
| FLUSHING CONNECTIONS | 1F | 1/8″ NPT | 2F | 1/4″ NPT |
NOTE: For process temperature over 212 °F, a capillary or cooling element is recommended. Contact NOSHOK factory to order.
1 When selecting a Monel or Carpenter 20 Diaphragm, the upper and lower housing must be the same material.
