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  Fluid Instrumentation
Borosilicate gauge glasses - Circular sight glasses
made from borosilicate glass “extra-hard”
 
 
From our standard range
Glass Permiss. PB**) bar Gasket
Diameter mm Thickness mm O. D. mm I. D. mm Thickness mm
31,75 12,7 175 *) *) *)
40 12 50 42 30 1,5
45 10 40 47 32 1,5
45 12 50 47 32 1,5
50 10 25 52 35 1,5
50 12 40 52 35 1,5
60 10 16 62 45 1,5
60 12 25 62 45 1,5
60 15 40 62 45 1,5
63 10 16 65 48 2
63 12 25 65 48 2
63 15 40 65 48 2
70 12 25 72 55 2
80 12 16 82 65 2
80 15 25 82 65 2
80 20 40 82 65 2
90 10 10 92 75 2
100 10 8 102 80 2
100 15 16 102 80 2
100 20 25 102 80 2
100 25 40 102 80 2
110 20 25 112 90 2
120 10 8 122 100 2
125 15 10 127 100 2
125 20 16 127 100 2
125 25 25 127 100 2
150 15 8 152 125 2
150 20 10 152 125 2
150 25 16 152 125 2
150 30 25 152 125 2
170 15 8 172 140 2
175 20 10 177 150 2
175 25 16 177 150 2
175 30 25 177 150 2
200 20 8 202 175 2
 
■Dimensions not in DIN 7080 or OeNORM M7353
*) Gasket set and micas for high-pressure steam gauges
**) PB=working pressure (gauge)
 
Technical datas

Material:
Borosilicate glass, thermally prestressed, optically tested, properties as laid down in DIN and OeNORM.
Extract from the OeNORM: “Chemical
pre-stressing of glasses is not permissible.
For safety reasons soda-lime glasses may not be used.”
Resistance to bending strain:
.160 N/mm2
Mean coefficient of linear expansion:
α20/300 .4.5 .10–6 . K–1, tested to DIN 52328.

Transition temperature:
tg=550.°C, tested to DIN 52324.

Chemical resistance
Alkali resistance:
alkali class 2, tested to ISO 675.
Water resistance:
hydrolytic class 1, tested ISO 719.
Acid resistance:
acid class 1, tested to DIN 12116.
moulded – ground – polished – thermally pre-stressed
Temperature resistance:
suitable for temperatures from –273°C to +300°C, size 31.75/12.7 up to 356.°C
 
 
Calculation of the correct glass thickness
 
All measurements in mm
 
KLINGER Package unit:
Sight glasses are packed in individual cardboard boxes. In addition to the glass, each package contains a KLINGER sealing gasket and cushion gasket and forms a complete unit ready for installation. Handy, shock-proof package.
 
Standards
We manufacture reflex and transparent glasses in series acc. to the following standards:
OeNORM M 7353 (Austrian Standard)
DIN 7080 (German Standard)
BS 3463 (British Standard Institution).
JIS 8211 (Japanese Industrial Standard)
At request we supply circular sight glasses in any desired dimension.
 
Dimensionals tolerances:
Glass DIN 7080 KLINGER
Ø OeNORM M 7353 house standard
31,75 mm ±.0,13 mm
to 125 mm ±.0,5 mm ±.0,5 mm
150 to 200 mm ±.0,8 mm ±.0,5 mm
Glass thickness
12,7 mm ±.0,05 mm
10 bis 20 mm ±.0,5 mm ±.0,5 mm
above 20 mm ±.0,8 mm ±.0,5 mm