Description
Single Channel Absorption Probe
ASD25-N probe for direct installation into bioreactors, pipelines and vessels measuring absorption, cell growth and optical density of various liquid samples under sanitary process environments. The probe is suited for Sterilization In Place (SIP) / and Clean In Place (CIP) procedures.
Used For
- Turbidity (optical density) scale:
- CU (concentration units)
- Absorption based monitoring of:
- cell growth and bacterial fermentation (Biotech, Pharma)
- algae concentration (Biotech, Pharma, food)
Typical Applications
Fermentation
The ASD25-N absorption probe is designed for use in production scale fermenters or bioreactors to precisely measure the growth of microbial or cell cultures as a function of NIR absorption. The extremely durable probe is designed for sanitary bioprocess environments and can be used in CIP / SIP processes.
| ASD25 | ||
|---|---|---|
| Schematic | 
No window gaskets used |
|
| Measurement | ||
| Measurement principle | 1- Channel Absorption of light | |
| Measurement wavelength(s) | 840 – 910 nm | |
| Detector(s) | 1 silicon photodiode (hermetically sealed) | |
| Measuring Range | any measuring range between:
|
|
| Optical path length | 1, 5, 10 or 20 mm | |
| Light source | Hybrid LED (hermetically sealed), 5.4 V DC, 100 mA
typical life span: approx 10 years |
|
| Protection | IP65 | |
| Process Adaption | ||
| Material | wetted parts: stainless steel 1.4435 (SS 316 L) dF < 1 %, BN2
surface: electro-polished Ra < 0,4 μm |
|
| Port connection | OSP25-GS60 (similar Ingold-port)
nominal length:60 and 30 mm diameter:25 mm thread:G1-1/4 in. ISO 228/1 |
|
| Port gasket | O-ring 18.64 x 3.53 mm EPDM (FDA / USP Class VI), others on request | |
| Insertion depth | 35 mm + OPL with port length 60 mm | |
| Process pressure | 10 mbar to 10 bar
(0.15 psi to 145 psi) |
|
| Windows | Sapphire (seal-less) | |
| Installation accessories |
|
|
| Temperature Ratings | ||
| Process temperature | permanent:5 – 65°C (41 – 149°F)
peak (60 min./day):5 – 135 °C (41 – 275 °F) thermal shutdown at approximately 75 °C (167 °F) |
|
| Ambient temperature | operation:0 – 40 °C (32 – 104 °F)
transport:-20 – 70 °C ( -4 – 158 °F) |
|
| Sterilization conditions | Autoclaving not possible | |
| Pressure and temperature ratings specified herein may be subject to limitations – see instruction manual. The appropriate choice of material for all wetted parts is the sole responsibility of the user. Data given are subject to changes without prior notice. | ||
