All-Quartz Immersion Probes
All-quartz immersion probesfrom Hellma have a probe head made of SUPRASIL® 300 quartz that is fused to a quartz tube, forming a leakproof seal. For this reason, these probes are particularly useful for transmission measurements in corrosive solutions, where the use of metal probes is not practical. Applicable in sub zero environment down to – 180 °C due to vacuum jack.
The collimated light beam passes the solution to be measured only once, equivalent to a measurement in a cell. The use of a deflecting prism with two fully reflective surfaces leads to very low values for stray light
Product info 661.302
| Type | 661.302-UV 661.302-NIR 661.302-UVS |
| Probe head material | Quarzglas SUPRASIL® 300 |
| Barrel material | Quartz |
| Probe head seal | directly fused |
| Outside Ø probe head | 15 mm |
| Outside Ø quartz barrel | 18 mm |
| Total length | approx. 270 mm (10 mm light path) |
| Max. immersion depth | 200 mm (bei 10 mm light path) |
| Light path | 1 mm, 2 mm, 5 mm, 10 mm, 20 mm, 50 mm |
| Typ. transmission | UV/Vis ca. 40 % in air above 300 nm NIR ca. 40 % in air above 400 nm |
| Max. pressure | 6 bar |
| Max. temperature | 150 °C |
| Fibre-optic cables | Built-in and only replaceable by manufacturer UV/Vis–2 m* 240 nm –1100 nm (41.667 cm-1–9.100 cm-1) NIR–2 m* 400 nm– 2.300 nm (25.000 cm-1– 4.348 cm-1) UV/Vis–low solarisation–2 m* 190 nm–1100 nm (52.632-1–9.100 cm-1) |
| Upgrade for lowest temperatures: | modification to 661.060 with vacuum jack down to -180 °C |
* Fibre-optic cables available in various lengths.
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Product info 661.500
| Type | 661.500 |
| Probe head material | Quartz SUPRASIL® 300 |
| Barrel material | Quartz |
| Probe head seal | directly fused |
| Outside Ø probe head | 15.5 mm |
| Outside Ø quartz barrel | Taper NS 19 /35 |
| Total length | approx. 200 mm (10 mm light path) |
| Max. immersion depth | 130 mm (10 mm light path) |
| Light path | 1 mm, 2 mm, 5 mm, 10 mm, 20 mm, 50 mm |
| Typ. Transmission | UV/Vis ca. 40 % in air above 300 nm NIR ca. 40 % in air above 400 nm |
| Max. pressure | 6 bar / 0.5 bar for vacuum application |
| Max. temperature | 150 °C |
| Fibre-optic cables | Not included, available separately for UV/Vis and NIR ranges see chapter 3.3.1 and 3.3.3). |
| Upgrade for lowest temperatures: | modification to 661.060 with vacuum jack down to -180 °C |
* Fibre-optic cables available in various lengths.
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