View Ports

The strongest, most secure sanitary sight glass available, Viewport's mechanically prestressed windows are available in a sanitary clamp design for sight ports in processing applications or inline visual flow indicators.

Unlike some other sight glasses, Viewport sight glasses meet the USP Type 1 standard for pharmaceutical use.

Described as offering the optics of glass and the strength of steel, these glass elements provide a level of safety, and a useful service life, well beyond that provided by conventional tempered glass or plastic in sanitary service. Even at the most extreme temperatures (as high as 536° F) or in overpressure situations, sudden, total failure - that involving leakage or explosive shattering of the glass - essentially never occurs.

 


Standard
Tube OD
d1
Inch/MM
d2
Inch/MM
d3
Inch/MM
S
Inch/MM
PSIG@
536  F
1/2", 3/4"0.98"/
25 mm
0.71"/
18 mm
0.39"/
10 mm
0.39"/
10 mm
230
1", 1 1/2"1.99"/
51 mm
1.61"/
41 mm
0.98"/
25 mm
0.39"/
10 mm
230
2"2.52"/
64 mm
2.05"/
52 mm
1.18"/
30 mm
0.39"/
10 mm
200
2 1/2"3.05"/
78 mm
2.72"/
69 mm
1.38"/
35
0.39"/
10 mm
200
3"3.58"/
91 mm
2.99"/
76 mm
1.57"/
40 mm
0.39"/
10 mm
150
3 1/2"4.17"/
106 mm
3.54"/
90
1.97"/
50 mm
0.39"/
10 mm
150
4"4.69"/
119 mm
4.02"/
102 mm
2.17"/
55 mm
0.47"/
12 mm
150
6"6.57"/
167 mm
5.98"/
152 mm
2.95"/
75 mm
0.63"/
16 mm
90
8"8.56"/
218 mm
7.80"/
198 mm
3.94"/
100 mm
0.71"/
18 mm
90
10"10.55"/
268 mm
9.65"/
245 mm
4.72"/
120 mm
0.79"/
20 mm
90
12"12.56"/
319 mm
11.81"/
300 mm
5.51"/
140 mm
0.87"/
22 mm
80
*Temperature and pressure apply to sight glass only. 

Viewport provides a level of safety and a useful service life, well beyond that provided by conventional tempered glass or plastic used as sight glass windows. Even in the most extreme temperature (to 572ºF using Hastelloy) or overpressure situations, sudden, total failure essentially never occurs. Viewport windows are formed by melting borosilicate glass into a precisely formed metal ring. As the glass cools, it solidifies, preventing the metal ring from contracting back to its theoretical size. The result is a uniform, mechanically prestressed fusion of glass and metal that combines excellent optical characteristics with greatly enhanced physical characteristics. Vital in sanitary service, the Viewport discs have an uninterrupted surface with no crevice to trap bacteria - no epoxies, resins, or glue - a true fusion. The standard surface finish is 10 Ra μ-in (0.25 Ra μm).

Electropolishing available upon request.
 

Viewports are manufactured to fit sanitary clamp connections. With
simple and fast installation with no risk of breakage, this sleek,
compact, one-piece design provides a cleaner look, less bacteria
traps and unsurpassed safety. The Viewport sight glass can
be used as a view port mounted on a ferrule, a “cross” for inline
visual flow indication or as a light port. Many other connection
types are also available, as shown on the reverse side. Materials
available include 2205 Duplex Stainless Steel, Hastelloy®,
Monel® and Inconel®.
Approvals and Technical Data:
- USP Class VI (tested to confirm biocompatibility)
- BPE Compliant and TÜV Approved
- Sight glass fused to metal conforming to DIN7079
- Borosilicate glass to USP Type I and DIN7080
- Standard surface finish of 10 Ra μ-in (0.25μm)
- Material to ASTM/ASME, TÜV and DIN/EN standards
- Certificate of Conformity to EN 10204-3.1B or 3.1A
- Pressure Equipment Directive 97/23/EG