AS16-F Color Probe

Single Channel VIS Absorption Probe

The AS16-F is a high precision absorption probe for direct installation into pipelines and vessels measuring visible (VIS) light absorption in liquid samples. Wavelength and optical path length can be individually configured to meet the process control requirements with the highest accuracy.

Used For

  • Color scale:
    • CU (concentration units)
  • Color control
    • for beer / water phase separation

Inline color measurement in demanding process conditions
No sampling or by-pass installation needed

Fast and accurate color measurements
Immediate detection of color changes to verify product quality

Hygienic probe design (3-A)
For pipe and vessel installation

Different wavelength modules available
Application optimized configuration

Optional validation accessories
Easy on-site / on-demand verification

The AS16-F is a precision absorption probe, which is designed for direct installation into pipelines and vessels and provides accurate concentration measurements with remarkable repeatability, linearity and resolution. A wide selection of different optical path lengths and insertion depths are available combined with optional calibration filters. The AS16-F uses a specific wavelength in the visible (VIS) spectrum to measure color in liquids with little or no turbidity.

Additionally, NIST-traceable calibration accessories provide absolute measurement confidence.

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

No window gaskets used

Measurement principle

1- Channel Absorption of light

Measurement wavelength(s)

AS16-F:430, 550 or 620 nm


1 silicon photodiode (hermetically sealed)

Measuring Range


any measuring range between

0 - 0.05 to 2 CU

(depending on wavelength)

Optical path length

1, 5, 10, 20 or 40 mm


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)


< ± 0.05 % of respective measuring range


< ± 0.5 % of respective measuring range


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


all optical parts have an IP rating of IP65 or higher

Process Adaption

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)

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.)

Process pressure

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


Sapphire (seal-less)

Installation accessories
  • weld-in ports
  • Varivent adapter (50.00)
  • clamp adapter (1.5 and 2.0 in.)
Temperature Ratings
Process temperature

permanent:0 - 100 °C (32 - 212 °F)

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

Ambient temperature

operation:0 - 40 °C (32 - 104 °F)

transport:-20 - 70 °C ( -4 - 158 °F)

Calibration adapter


Calibration adapter VB

Filter adapter FH03 for calibration filter used for sensor verification

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.

C4000 - C8000 Product Information

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