Immersion probes for process measuring technology
These Hellma transmission probes are, amongst other things, suitable for special application conditions in process monitoring at high temperatures and pressures.
These probes have a monolithic probe head made of quartz glass SUPRASIL® 300. By using a total reflection prism, the light beam passes through the sample only once, as with a cuvette measurement. The stray light is minimised.
Product info 661.790-NIR, 661.792-NIR without flange
| Typ | 661.790 NIR; 661.792 NIR |
| Sensing head material | Quartz glass SUPRASIL® 3000 |
| Probe barrel material | Stainless steel 1.4571 (316 Ti) or Material 2.4602 (Hastelloy® C-22) |
| Flannge | without |
| Sealing of sensing head | Perfluoroelastomer FFKM (ASTM D1418) Fluoropolymer PTFE (ASTM D1600) |
| Outer-Ø | 20 oder 25 mm |
| Total length (incl. SMA socket) | 353 mm |
| Max. immersion depth | 240 mm |
| Typical transmission | NIR: > 40 % in air at 1,500 nm |
| Max. pressure | 35 bar |
| Max. temperature | 260 °C |
| Optic fibre | Firmly installed, can be changed at Hellma NIR 400 nm – 2,300 nm (25,000 cm-1 – 4,348 cm-1 UV/Vis and UV/Vis low solarisation upon request. |
| Optic fibre connections | Sockets for FSMA Type 905 |
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Product info 661.793-NIR with flange
| Type | 661.793 NIR |
| Sensing head material | Quartz glass SUPRASIL® 300 |
| Probe barrel material | Stainless steel 1.4571 (316 Ti) or Material 2.4602 (Hastelloy® C-22) |
| Flange | DIN 25 / PN 40 Form A* |
| Sealing of sensing head | Perfluoroelastomer FFKM (ASTM D1418) Fluoropolymer PTFE (ASTM D1600 |
| Outer-Ø | 25 mm |
| Total length (incl. SMA socket) | 353 mm |
| Max. immersion depth | 200 mm |
| Typical transmission | NIR: > 40 % in air at 1,500 nm |
| Max. pressure | 35 bar (at max. 100° C)* |
| Max. temperature | 260 °C (at max. 25 bar)* |
| Optic fibre | Firmly installed, can be changed at Hellma NIR 400 nm – 2,300 nm (25,000 cm-1 – 4,348 cm-1) |
| Optic fibre connections | Sockets for FSMA Type 905 |
* according to EN-1092-1
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