Design
ASME B40.100 & EN 837-1
Sizes
2½”, 4” & 6” (63, 100 and 160 mm)
Accuracy class
2½”: ± 2/1/2% of span (ASME B40.100 Grade A)
4” & 6”: ± 1.0% of span (ASME B40.100 Grade 1A)
Ranges
Vacuum / Compound to 200 psi (16 bar)
Pressure from 0/15 psi (1 bar) to 0/15,000 psi (1,000 bar) – 2½”, 4”
Pressure from 0/10 (0.6 bar) to 0/20,000 psi (1,600 bar) – 6” or other equivalent units of pressure or vacuum
Working pressure
2½”: Steady: ¾ scale value
Fluctuating: 2/3 full-scale value
Short time: full-scale value
4” & 6”: Steady: full-scale value
Fluctuating: 0.9x full-scale value
Short time: 1.3x full-scale value
Operating temperature
Ambient: -40°F to +140°F (-40°C to +60°C) – dry
-4°F to +140°F (-20°C to +60°C) – glycerine-flled

-40°F to +140°F (-40°C to +60°C) – silicone-flled
Medium: +392°F (+200°C) maximum – dry
+212°F (+100°C) maximum – liquid-flled
Temperature
Additional error when temperature changes from reference temperature of 68°F (20°C) ±0.4% of span for every 18°F (10°K) rising or falling.
Weather protection
Weather tight (NEMA 4X / IP65)
Pressure connection
Material: 316L stainless steel
Lower mount (LM) or lower back mount (LBM)
Center back mount (CBM) for 2½” size ¼” NPT or ½” NPT (other connections available)
Bourdon tube
Material: 316 stainless steel
> 1,000 psi (100 bar): C-shape
< 1,500 psi (100 bar): helical
Movement
Stainless steel
Dial
 White aluminum with black lettering; 2½” with stop pin

Pointer

Black aluminum, adjustable
* 304 Stainless steel
2½”- with pressure relief/fill plug on top of case
4” and 6”- with blow out plug on back of case and fill plug on top of case
* For pressure ranges < 300 psi, case has compensating valve/fll plug to vent case pressure
Bezel ring
Stainless steel, bayonet-type
Window
Polycarbonate (2½”) and Safety Glass (4” & 6”) with Buna-N gasket
Case fill
Glycerine 99.7% – Type 233.50

Optional extras
* Other pressure connections
* Restrictors for applications with high dynamic pressure pulsations
* Monel wetted parts (Type 26X.50), not available in 6” LBM
* Front flange, SS (CBM and LBM only)
* Rear flange, SS
* 316 SS case material
* U-clamp mounting, SS (not available on 4½”)
* Silicone or Halocarbon case flling
* Non-adjustable pointer
* Red drag pointer or mark pointer
* Safety glass window
* Custom dial layout
* Other pressure scales available: bar, kPa, MPa, kg/cm² and dual scales
* Integral alarm contacts or transmitters
* For size 4 ½” please see date sheet 23X.40 4.5