Description
HAWK Diaphragm Pressure Gauge use a diaphragm as its sensing element which can be welded or bonded or clamped to the upper and lower housing. The diaphragm deflects upward or downward when subjecting or releasing to pressure. This variation is converted into the rotary motion of the pointer by a movement and a connecting rod. It is a alternative to a liquid filled actuated system (pressure gauge and diaphragm seal assembly). HAWK type 81L diaphragm process gauges with phenolic case are widely used for petrochemical and chemical processing industries. There is a solid wall between pressure sensing element and the window. This design provides better safety for monitoring the gauges in the event of the gauge failure.
Typical Applications
- Petrochemical and chemical processing
- Offshore oil platforms & gas industries
- Industrial OEM equipment
- Power generating stations
- Food processing plants
- Energy and water treatment plants
Specifications
PRESSURE LIMIT
Steady: 100%*full scale value
Pulsation: 90%*full scale value
Sudden: 130%*full scale value
The appropriate operating range falls in the middle half of the gauge (25% to 75% of full scale). If you choose the unsuitable range, the fatigue of bourdon tube may be resulted. HAWK Supplies a wide selection of range from vacuum to 25 bar including compound range. Special design for high over-pressure (5 times), but max 25 bar is available on request.
TEMPERATURE LIMIT
Ambient: -40 to 80°C (Dry), -10 to 65°C (Liquid Filled).
Media: max 125°C-SS (Standard), 300°C (Optional).
TEMPERATURE EFFECT
Accuracy of measurement will be effected by the temperature change. This inaccuracy may as high as ±0.8% for 10°C temperature change.
LIQUID FILLED
Liquid filling of the diaphragm gauge is available.
DIAL SIZE
4 1/2″ (115mm).
CASE & RING
Phenol, bezel ring threaded with a gasket.
SOCKET
316 Stainless Steel.
MOVEMENT
Stainless steel movement with overload and underload stops – Standard, Dampened movement on request.
SENSING ELEMENT
Diaphragm.
WINDOW
Tempered safety glass – Standard,
Polycarbonate or Laminated safety glass – Option.
BOLTS
Stainless Steel.
UPPER HOUSING MATERIAL
SS316, SS304, SS316L, SS316 with PTFE Coating, SS316 with Titanium Coating.
DIAPHRAGM MATERIAL
SS316L, SS316L with Hastelloy C Foil, SS316L with Monel Foil, SS316L with Tantalum Foil, SS316L with PTFE Coating, SS316L with PTFE Coating/Tantalum Foil, SS316L with Titanium Coating, SS316L with PTFE Lining (Foil), SS316L with Titanium Coating and PTFE Foil, Steel, Steel with Nickel Plated.
LOWER HOUSING MATERIAL
SS316, SS316L, SS304, Inconel, Monel, Titanium, Tantalum, SS316 with PTFE Coating, SS316 with Titanium Coating, SS316 with PTFE Lining, Hastelloy C/PTFE(ETFE) Coating.
GASKET
Telfon – Standard, Viton, Buna N.
POINTER
Anodized aluminum with black finish.
ACCURACY
±1.5% of span – Standard,
±1.0% of span – Option.
ZERO-ADJUSTMENT
Micro-adjustable pointer.
SCALE
PSI, kPa, Mpa, bar, kg/cm2, inHg, cmHg, torr, mmHg, mmH2O, mbar, inH2O, oz./in2 (single or dual scale).
CONNECTION
Thread or Flange/Double Flange.
MOUNTING
Stem and surface mounting.
WEATHERPROOF
NEMA 3/3X(IP54) – Standard,
NEMA 4/4X(IP65) – Option.
