Saunders & Weeks (Bristol) Ltd Vacuum & Temperature Instrumentation - click here for text version.
   
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Safety Pattern

Intended Service
Where the pressure medium is a volatile gas, such as oxygen or acetylene, a safety pattern gauge should be used, where the gaseous medium is not volatile, such as air or nitrogen, and the pressure is greater than 25 bar the Fig. 90 gauge (safety pattern) should be used. The essence of this type of gauge is safety.
Safety Pattern Gauge
 
Normal Sizes 60, 80, 100, 150, 200 and 250mm
Accuracy Class For 63mm: ± 1.6% Maximum Scale Value
For 80 to 250mm: ± 1.0% Maximum Scale Value
EN 837:1998
Design EN 837:1998
Scale Ranges -1 to 1000 bar or equivalent other units of pressure or vacuum
Working Pressure
Steady 3/4 of full scale value
Fluctuating 2/3 of full scale value
Short time Full scale value
Operating Temperature
Ambient TMIN –25 to TMAX +60 ºC
Medium TMAX +60 ºC
Temperature Error
Additional error when temperature of the pressure element deviates from +20 ºC
Rising Temperature +0.3%/10 ºC
Falling temperature -0.3%/10 ºC
Percentage of the true scale value
  STANDARD FEATURES
Pressure Connections
Radial or back entry
Material Brass
Pressure Element
Material Phosphor Bronze up to 40 Bar, Stainless Steel from 40 to 1000 Bar
Movement
Material Brass with Nickel Silver pinions and arbors.
Dial Aluminium with black lettering on white. With Pointer stop pin
Pointer Black aluminium pointer
Case Steel
Window Clear plastic or laminated safety glass
Optional Extras Stainless Steel casing, Stainless Steel wetted Parts, Monel wetted parts, Oxygen Service
 
   
Saunders & Weeks (Bristol) Ltd, 265-267 Church Road, Redfield, Bristol BS5 9HU, United Kingdom