AF26 Chlorine Dioxide Analyzer with a flange sensor body

Chlorine Dioxide analyzer mounted on a TFMC flow cell

AF26 absorption sensor mounted on a varivent housing typically used in breweries

AF26 lamp and detector assemblies not mounted on a flow cell

AF26 Chlorine Dioxide Gas monitor mounted on a z-body

AF26 lamp and detector assemblies without a sensor body

AF26 VIS/NIR Sensor

Dual Channel VIS/NIR Absorption Sensor

The AF26 is a high precision dual channel color sensor for inline operation; the secondary wavelength is designed to compensate the desired light absorbance measurement from any undesired light scattering influence, such as suspended solids, gas bubbles, immiscible fluids or window fouling. The AF26 sensor’s output can be correlated to almost any color scale including APHA and Hazen.

Used For

Color scales:
- APHA / HAZEN / Pt/Co color
- AOCS (Method Cc 13b-45) color
- ASTM (D1500) color
- EBC color
- ASBC color
- Gardner (ASTM D1544) color
- ICUMSA color
- KLETT color
- Reference Base Unit (RBU, color)
- Saybolt (ASTM D 156, D 6045) color
Concentration control of
- chlorine and chlorine dioxide (gas and liquid)
- of metal ions (Iron, Chromium, Copper, Nickel, Cobalt, Manganese, etc. ) in Plating industry
Drinking water treatment (APHA color)
Colored waste water monitoring (e.g., Textile industry)

Features

Benefits

Configurable dual channel color sensor with 2 wavelengths

Flexibility to measure a broad range of products for turbidity compensated color measurement

High performance sensor for broad range of applications

Measurement can be expressed in any color scale, e.g., APHA, Saybolt, ASTM, ICUMSA, EBC, Gardner etc.

Available for installations in hazardous areas

Complies with IECEx, ATEX, FM

NIST-traceable validation accessories

Easy on-site / on-demand verification

Different wavelength modules available

Application optimized configuration

The AF26 is a high precision dual channel sensor which is designed for inline operation. The dual channel AF26 sensor provides accurate absorption measurements with remarkable repeatability, linearity and resolution. The AF26 sensor’s output can be correlated to almost any color scale including APHA and Hazen. Selected combinations of optical filters make it possible to focus on specific wavelengths ensuring suitable adaptation to the application. Typically, one of the two measured wavelengths is used as a reference channel, where it can be used to prevent the influence of particulate, gas bubbles and lamp aging. Additionally, NIST-traceable calibration accessories provide absolute measurement confidence.

AF26
Schematic	Sensor Body Windows Beam splitter Filter A Measurement detector A Filter B Measurement detector B Optics module Lamp module
Measurement
Measurement principle	2- Channel Absorption of light
Measurement wavelength(s)	385/430, 385/550, 385/620, 400/550, 400/620, 420/700, 430/525, 430/620, 430/700, 460/620, 470/620, 470/700, 525/620, 525/700, 550/800, 620/800, 660/750, 670/550, 670/750, 1000/800 nm, others on request
Detector(s)	2 silicon photodiodes (hermetically sealed)
Measuring Range	any measuring range between 0 - 0.05 to 3 CU (dependent on filter used) (contact product specialist for application specific ranges)
Optical path length	1 - 1000 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)
Resolution	< ± 0.05 % of respective measuring range
Repeatability	< ± 0.5 % of respective measuring range
Linearity	< ± 1 % of respective measuring range (specific to application)
Protection	all optical parts have an IP rating of IP65 or higher
Sensor Body
Material	Stainless steel 1.4435 (SS 316L), 1.4539 (904 L), 1.4571 (SS 316Ti), 1.4462 (318 LN), Titanium 3.7035 (Grade 2), Hastelloy 2.4602 (C22), ... others on request
Line size	1/8 in. to 6 in. (DN 6 to DN 150), ... others on request
Process connection	Flanges (ASME, DIN, EN, JIS), Clamps (TC, ISO, DIN), Female Threads (NPT, DIN), Sanitary Threads (DIN 11851), Tube Ends (DIN, ISO, OD),DIN 11864-1/-2/-3 (DIN, ISO, OD), ... others on request
Process pressure	0 - 100 bar (0 - 1450 psi) - higher on request depending on process connection, materials and design
Windows	1-Pyrex®, 2-Sapphire, 3-Sapphire Biotech
Window gaskets	Silicone (FDA, USP Class VI), Viton® (FDA, USP Class VI), Viton® - FEP (FDA, USP Class VI), EPDM (FDA, USP Class VI), Kalrez® 6230 (FDA, USP Class VI), Kalrez® 4079, ... others on request
Temperature Ratings
Process temperature	permanent: 0 - 120 °C ( 32 - 248 °F) peak 15 min/day: 0 - 150 °C ( 32 - 302 °F)
Process temperature OPTION HT	permanent: -30 - 240 °C (-22 - 464 °F) peak 15 min/day: -30 - 260 °C (-22 - 500 °F)
Process temperature OPTION EX	permanent: -30 - 120 °C (-22 - 248 °F) peak 15 min/day: -30 - 150 °C (-22 - 302 °F)
Process temperature OPTION EX-HT	permanent: -30 - 240 °C (-22 - 464 °F) peak 15 min/day: -30 - 260 °C (-22 - 500 °F)
Ambient temperature	permanent: 0 - 40 °C ( 32 - 104 °F) operation: -30 - 40 °C (-22 - 104 °F) with options HT / EX / EX-HT transport: -20 - 70 °C ( -4 - 158 °F)
Explosion Proof
Ex-proof	none
Ex-proof OPTION EX (EN-D)	Sensor assembly in ex-proof version accor. ATEX (EN-D)
Ex-proof OPTION EX (FM-D)	Sensor assembly in ex-proof version accor. FM (FM-D)
Calibration
Calibration adapter	none
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.