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Principle
The principle of Reflex Level Gauges is
based on the difference in the refractive
indices of liquid and vapour. The liquid
column is contained within the recess of the
liquid chamber behind the sight glass which
is clamped to the gauge body. The sight
glass has prismatic right angled grooves on
the side facing the liquid and vapour space.
Light rays entering from outside the gauge
are either
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Specificaitons
- C/C Distance: Upto 3000mm; single
piece liquid chamber.
- Materials: Carbon steel and stainless
steel as standard; others on request.
- Glass: Toughened borosilicatc
- Connections: Flanged, screwed or
socket weld.
- Gauge Valve: Auto-shut-off ball check,
off-set pattern, bolted or screwed
bonnet.
- Drain Valve: Gate or Needle type
- Packing: Grafoil*/ PTFE
- Fasteners: ASTM A-193 Gr. B7 / A-194
Gr. 2H.
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absorbed or reflected depending upon whether
they enter the liquid or vapour space. When
the ray of light encounters the surface of
one of the grooves in the vapour space, it
is reflected to the opposite surface of the
grooves and from there, totally reflected
back to the direction of observation.
Thus, vapour space appears as silvery
white. When the light ray encounters the
surface of the grooves in the liquid space,
it is totally absorbed, thereby making the
liquid behind the glass appear black.
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- Options:
- Anti-frost extension for low
temperature service.
- Heating / Cooling arrangements.
Applications
- Saturated steam: Upto 464 psig (32
bar)
- Other media: Upto 3190 psig (220 bar)
at 7520 F (4000 C)
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