AF56-F Color Sensor

Single Channel Color Sensor

AF56-F is a high quality sensor for direct installation into pipelines measuring visible (VIS) light absorption of various liquid samples at a specific wavelength of 430 nm. The optical path length (OPL) can be individually configured to meet the process control requirements.

Used For

  • Color scale:
    • CU (concentration units)
  • Color monitoring
    • of CIP processes
    • for interface detection in beverage production

The AF56-F is a precision color sensor which is designed for inline operation. Using light in the visible range (VIS) at 430 nm the AF56-F is used to measure color or color changes. A light reduction based on an increased intensity of the color is precisely detected.


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

Fast and accurate color measurement or color changes
Immediate detection of color changes to verify product quality
  1. Sensor Body
  2. Windows
  3. Filter
  4. Measurement detector
  5. Optics module
  6. Lamp module
Measurement principle

1- Channel Absorption of light

Measurement wavelength(s)

AF56-F:430 nm


1 silicon photodiode (hermetically sealed)

Measuring Range

any measuring range between

AF56-F:0 - 0.5 to 2 CU

Optical path length

1 - 200mm


Abs.: 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)


< ± 0.5 % 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

Sensor Body

Stainless steel 1.4435 (SS 316L), 1.4539, 1.4571 (SS 316Ti), 1.4462, Titanium 3.7035 (Grade 2), Hastelloy 2.4602 (C22), Plastic TFM4215, PVC, ... others on request

Line size

1/8 in. to 6 in. (DN 6 to DN 150), ... others on request

Process connection

Flanges (ASME, DIN, JIS), Clamps (TC, ISO, DIN), Female Threads (NPT, DIN), Sanitary Threads (DIN 11851), Tube Ends (DIN, ISO, OD), Varivent, ... others on request

Process pressure

10 mbar to 100 bar (0.15 psi to 1450 psi) - higher on request depending on process connection, materials and design


1-Pyrex®, 2-Sapphire, 3-Sapphire Biotech

Window gaskets

Silicone (FDA), Viton® (FDA), EPDM (FDA / USP Class VI), Kalrez® 4079, ... others on request

Temperature Ratings
Process temperature

permanent:0 – 100 °C (32 – 212 °F)

peak (15 min/day):0 – 120 °C (32 – 248 °F)

Process Temperature

permanent:0 – 60 °C (32 – 140 °F)

peak (15 min/day):0 – 80 °C (32 – 176 °F)

Ambient temperature

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.

x56 Series Product Information

Visit our documentation page to view a complete list of translated documents.