Oblong Sight Glass
Type 633 — Oblong Sight Glass
D-ended sight glass fitting · PN 2.5
Select the size, materials and mounting version for your application.
Technical data
Pressure and glass
- Pressure rating
- 2.5 bar (PN 2.5); higher pressures on request
- Soda-lime-silicate glass
- DIN 8903 · up to 100°C
- Borosilicate glass
- DIN 7081 · up to 243°C
- View width
- 50 mm
Frames, bolts and seals
- Base frame · 25 mm
- 1.4404 / 1.4571 / 1.4435 / 1.4462 / ST37 / H2
- Top frame · 15 mm
- 1.4301 / 1.4404 / ST37 / H2
- Bolts
- DIN 912 A2-70 or A4-70
- Seals
- EPDM, Reinz AFM 34 or PTFE; others on request
The datasheet lists the seals as FDA compliant. Base-frame APZ DIN EN 10204-3.1 documentation is available on demand.
Dimensions and mounting
| Size | A (mm) | B (mm) | View height (mm) | View width (mm) | M10 bolts | Glass dimensions (mm) |
|---|---|---|---|---|---|---|
| 1 | 266 | 116 | 200 | 50 | 8 | 70/10 × 220 |
| 2 | 341 | 116 | 275 | 50 | 10 | 70/10 × 295 |
| 3 | 416 | 116 | 350 | 50 | 12 | 70/10 × 370 |
| 4 | 491 | 116 | 425 | 50 | 14 | 70/10 × 445 |
| 5 | 566 | 116 | 500 | 50 | 16 | 70/10 × 520 |
| 6 | 641 | 116 | 575 | 50 | 18 | 70/10 × 595 |
| 8 | 791 | 116 | 725 | 50 | 22 | 70/10 × 745 |
After welding, check the seal area of the base flange and adjust it if uneven.
Ordering information
Choose your options to build an enquiry reference.
This enquiry reference summarises your selections; it is not a manufacturer part number. Quantity is entered on the quote-request page.
For higher pressures or other seals, include your requirements with the quote request.
Specifications are general selection guidance. Confirm materials, connection standards, operating temperature and pressure with Sightflow before placing an order.