Worldwide Inline Process Control Solutions

Probe Sensors AS16 / AS56

optek AS16-VB-N Single Channel Absorption Probe with Calibration Option

Typical Applications:

  • Cell density in fermentation (AS16-N)
  • Milk/water phase separation (AS56-N)
  • Beverage blending (AS16-F)
  • Beer/water phase separation (AS56-F)

Overview

Models AS16 and AS56 are high precision sensors measuring turbidity (AS16-N and AS56-N) or color (AS16-F and 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.

AS16

The AS16 series offers the high-end range of optek probe sensors. A wide selection of different optical path lengths and insertion depths combined with optional calibration filters and electro-polished stainless steel meet all requirements of the biotechnology industry.

AS56

The AS56, based on the same design as the AS16 with seal-less window construction, is typically used in food and beverage applications. Limited variations allow cost effective measurement (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. The AS16-N and 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). The AS16-F and AS56-F uses a specific wavelength in the visible spectrum to measure color in liquids with little or no turbidity (e.g., beer in water during phase change).

OPL

optek AS16-N Single Channel Absorption Probe

Special optical windows are made from a single crystal sapphire, providing superior resistance to all abrasive and corrosive media. optek‘s superior manufacturing techniques allow mounting the windows without gaskets or glue for lifetime without maintenance. The appropriate choice of the optimal OPL (optical path length = distance between the windows) supports all measurement requirements, i.e., low/high measuring ranges at highest resolution.

NIST-traceable

NIST-traceable calibration accessories (AS16 only) provide absolute measurement confidence.

Top of page

Technical Data

AS16 AS56
Schematic
  1. OPL
  2. Windows
  3. Lamp module
  4. Optics modules (incl. filter)
  5. Detector module

No window gaskets used

Measurement
Measurement principle

1- Channel Absorption of light

Measurement wavelength(s)

AS16-N:730 - 970 nm

AS16-F:430, 550 or 620 nm

AS56-N:730 - 970 nm

AS56-F:430 nm

Detector(s)

1 silicon photodiode (hermetically sealed)

Measuring Range

AS16-N:

any measuring range between

0 - 0.05 to 6 CU

AS16-F:

any measuring range between

0 - 0.05 to 2 CU

(depending on wavelength)

AS56-N:

any measuring range between

0 - 0.05 to 4 CU

AS56-F:

any measuring range between

0 - 0.05 to 1.5 CU

Optical path length

1, 5, 10, 20 or 40 mm

5 or 10 mm

Calibration

CU (concentration units) application specific calibration

Light source

special incandescent tungsten lamp 5.0 V DC, 970 mA

typical life span: 3 to 5 years (25,000 to 40,000 hours)

special incandescent tungsten lamp 5.0 V DC, 450 mA

typical life span: 3 to 5 years (25,000 to 40,000 hours)

Resolution

< ± 0.05 % of respective measuring range

< ± 0.5 % of respective measuring range

Repeatability

< ± 0.5 % of respective measuring range

< ± 1.0 % of respective measuring range

Linearity

< ± 1 % of respective measuring range (specific to application)

< ± 2 % of respective measuring range (specific to application)

Protection

all optical parts have an IP rating of IP65 or higher

Process Adaption
Material

wetted parts: stainless steel 1.4435 (SS 316 L) dF < 1 %, BN2

surface: electro-polished Ra < 0,4 μm

housing: stainless steel 1.4571 (SS 316 Ti)

wetted parts: stainless steel 1.4435 (SS 316 L)

surface: electro-polished Ra < 0,8 μm

housing: stainless steel 1.4571 (SS 316 Ti)

Port connection

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

Port gasket

O-ring 18.64 x 3.53 mm EPDM (FDA / USP Class VI)

Insertion depth

35 mm (1.38 in.) + OPL at a port length of 60 mm (2.36 in.)

135 mm (5.31 in.) + OPL at a port length of 60 mm (2.36 in.)

35 mm (1.38 in.) + OPL at a port length of 60 mm (2.36 in.)

Process pressure

10 mbar to 20 bar (0.15 psi to 290 psi)

10 mbar to 10 bar (0.15 psi to 145 psi)

Windows

Sapphire (seal-less)

Installation accessories
  • weld-in ports
  • Varivent adapter (50.00)
  • clamp adapter (1.5 and 2.0 in.)
  • optek T-pieces DIN 11850 (DN50 - DN100)
  • optek T-pieces OD (BS4821-1) (2.0 - 4.0 in.)
Temperature Ratings
Process temperature

permanent:0 - 100 °C (32 - 212 °F)

peak 60 min/day:0 - 150 °C (32 - 302 °F)

permanent:0 - 90 °C (32 - 194 °F)

peak 60 min/day:0 - 100 °C (32 - 212 °F)

Ambient temperature

operation:0 - 40 °C (32 - 104 °F)

transport:-20 - 70 °C ( -4 - 158 °F)

Calibration
Calibration adapter

none

N/A
Calibration adapter VB

Filter adapter FH03 for calibration filter used for sensor verification

N/A
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.

Top of page

Installation Accessories:


  • Tri-Clamp adapter

  • Varivent adapter

  • Weld-in port 15°

  • Weld-in port 0°

  • T-Piece

Top of page