Aluminum
Fluid Level Sight Glasses
GN 744
GN 744

GN 744

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Specification
Information

Body: Aluminum, turned, with with matte shot-blast finish
Prismatic reflector: Transparent plastic
Sealing ring: Nitrile rubber (Perbunan)

GN 744 fluid level sight glasses with prismatic reflector expand the range and usage of oil level sight glasses. With the cats-eye prism effect on the oil color, oil viscosity not-with-standing, the view is quite clear. The real advantage of the prism effect is when over-filling, under-filling and poor lighting situations arise. Should not be used in applications where viewing of alcohol level is required.
Fluid level sight glasses can also be used on pressurized tanks. The data on pressure and vacuum tests is available upon request.
The O-ring is housed in the same aluminum body as the GN 743 oil level sight glasses.
The sealing is achieved with an O-ring on the periphery and not on the face edge of the glass. Leak tightness is therefore not effected by axial pressures.
The seal is put in a groove in the housing and it can therefore not be lost, In addition, this groove prevents the seal from being extruded when the sight glass is tightened. The location of the seal also allows the use of a softer elastomer which guarantees better and easier sealing.
Maximum heat resistance: 100°C (212°F). 
Note: When mounting fluid level sight glasses on walls of less than 4mm (.157") thick, use mounting nut part series GN 543.1.

See our Technical Section for pipe thread size details and pressure ratings.
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Metric Thread Table

Dimensions in:

millimeters
(inches)

Part
Number
d1
d2
Thread
d3
l1
l2
s
Max Pressure,
psi @ 70°F
14
(.55)
M20 x 1.5
26
(1.02)
8.5
(.33)
7.5
(.30)
23
(.91)
200
18
(.71)
M26 x 1.5
32
(1.26)
9
(.35)
8
(.31)
30
(1.18)
200
M27 x 1.5
24
(.94)
M33 x 1.5
40
(1.57)
11
(.43)
8.5
(.33)
36
(1.42)
50
BSPP Parallel Thread Table

Dimensions in:

millimeters
(inches)

Part
Number
d1
d2
Pipe Thread
d3
l1
l2
s
Max Pressure,
psi @ 70°F
14
(.55)
G 1/2"
26
(.24)
8.5
(.33)
7.5
(.30)
23
(.91)
200
18
(.71)
G 3/4"
32
(1.26)
9
(.35)
8
(.31)
30
(1.18)
200
24
(.94)
G 1"
40
(1.57)
11
(.43)
8.5
(.33)
36
(1.42)
50