Models AS56 are high precision sensors measuring turbidity (AS56-N) or color (AS56-F) for use in various industries. The sensors are designed for inline operation and provide accurate concentration measurements with remarkable repeatability, linearity and resolution.
The AS56, based on the same design as the AS16 has wetted parts made from electro-polished stainless steel and a seal-less window construction. It is typically used in food and beverage applications to allow cost-effective measurements (e.g., phase separation).
NIR-Absorption (Turbidity) VIS-Absorption (Color)
A special tungsten lamp produces a constant light beam that passes through the process medium. The attenuation of the light intensity, caused by absorption and/or scattering by dissolved and undissolved substances, is detected by a sealed silicon photodiode. AS56-N uses light from 730 - 970 nm to measure solids concentration independent from color or color changes (e.g., yeast concentration in beer during tank draining).
AS56-F uses a specific wavelength of 430 nm in the visible spectrum to measure color in liquids with little or no turbidity (e.g., beer in water during phase change).
Special optical windows are made from a single crystal sapphire, providing superior resistance to all abrasive and corrosive media. optek superior manufacturing techniques allow mounting the windows without gaskets or glue for a lifetime without maintenance. The appropriate choice of the optimum OPL (optical path length = distance between the windows) supports all measurement requirements, i.e., low/high measuring ranges at highest resolution.
No window gaskets used
1- Channel Absorption of light
AS56-N:730 - 970 nm
1 silicon photodiode (hermetically sealed)
any measuring range between
0 - 0.05 to 4 CU
any measuring range between
0 - 0.05 to 1.5 CU
|Optical path length||
5 or 10 mm
CU (concentration units) application specific calibration
special incandescent tungsten lamp 5.0 V DC, 450 mA
typical life span: 3 to 5 years (25,000 to 40,000 hours)
< ± 0.5 % of respective measuring range
< ± 1.0 % of respective measuring range
< ± 2 % of respective measuring range (specific to application)
all optical parts have an IP rating of IP65 or higher
wetted parts: stainless steel 1.4435 (SS 316 L)
surface: electro-polished Ra < 0,8 μm
housing: stainless steel 1.4571 (SS 316 Ti)
thread G1-1/4 in., ISO 228/1 for port AS25 (similar Ingold-port)
diameter: 25 mm ( D= 25 H7)
O-ring groove for 30 mm and for 60 mm port length
O-ring 18.64 x 3.53 mm EPDM (FDA / USP Class VI)
35 mm (1.38 in.) + OPL at a port length of 60 mm (2.36 in.)
10 mbar to 10 bar (0.15 psi to 145 psi)
permanent:0 - 90 °C (32 - 194 °F)
peak 60 min/day:0 - 100 °C (32 - 212 °F)
operation:0 - 40 °C (32 - 104 °F)
transport:-20 - 70 °C ( -4 - 158 °F)
|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.|