Endress+Hauser CUE25 Specifications
Technical Information
Turbimax CUE25 / CUE26
Handheld turbidimeter for field measurement
Application
Turbimax CUE25 / CUE26 are compact handheld meters for
the measurement of turbidity in the field. They are suitable for
the following fields of application
• Drinking water
•Process water
•Wastewater
TI397C/07/en/07.06
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Your benefits
• Rugged carrying case containing everything needed
– battery pack
– calibration standards
– manual
• Waterproof case provides use in any wet environment
• Versions with white light source and infrared light source
available
• Auto ranging 0.01 to 1100 NTU / FNU
• Simple calibration procedures
• Reusable calibration standards
• Long-life batteries
Function and system design
Measuring principle Turbidity measurement
For turbidity measurement a light beam is sent through the medium and is diverted from its original direction
by optically denser particels, e.g. solid matter particles.
Measuring methods 90° WL scattered light method
The measurement uses the standardised 90° scattered light method acc. to U.S. EPA 180.1.
The turbidity of the medium is determined by the amount of scattered light. The transmitted white light beam
is scattered by the solid matter particles in the medium. The scattered beams are detected by scattered light
receivers which are arranged at an angle of 90° to the white light source.
90° NIR scattered light method
The measurement uses the standardized 90° scattered light method acc. to ISO 7027 / EN 27027.
The turbidity of the medium is determined by the amount of scattered light. The transmitted light beam with
a wavelength in the near-infrared range is scattered by the solid matter particles in the medium. The scattered
beams are detected by scattered light receivers which are arranged at an angle of 90° to the infrared light
source.
Turbimax CUE25 / CUE26
90° scattered light method
Functions IR or white light measurement
The Turbimax is available as infrared version, CUE25, to meet the design criteria specified in ISO 7027 and
DIN 27027. The white light version, CUE26, meets the design criteria on turbidity measurement specified by
the US EPA 180.1. Both versions have long life lamps.
Auto ranging 0.01 to 1100 NTU
Turbimax CUE25/26 senses the turbidity level of a sample and automatically adjusts to the appropriate
measuring range.
Simple calibration procedures
Calibration initiated with the push of a button ensures accurate readings.
Reusable calibration standards
The calibration standards allow quick and easy calibration across all ranges without the need to mix Formazin.
The standards have a minimum shelf life of 12 months.
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2 Endress+Hauser
Turbimax CUE25 / CUE26
Measuring system The measuring system comprises:
• Turbimax CUE25 / CUE26 turbidimeter
• Sample cuvette with light shield cap
• Indexing ring
1
2
3
v
4
Turbimax CUE25 system (example)
Black light shield
1
Indexing ring
2
Sample cuvette
3
Input
Measured variables Turbidity
Measuring range 0.01 to 1100 NTU/FNU
Power supply
Batteries 4 AAA alkaline batteries
(over 5000 tests)
Supply voltage 4 x 1.5 V
4
5
6
6
Optical well
Display
Touch pad
5
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Performance characteristic
Response time < 14 s
Reference temperature 25 °C (77 °F)
Resolution 0.01 NTU below 100 NTU
0.1 NTU in the range 100.0 to 999.9 NTU
1.0 NTU in the range 1000 to 1100 NTU
Maximum measured error
Repeatability ±2 % of reading
Endress+Hauser 3
0 to 500 NTU: ±2 % of reading or 0.01 NTU
500 to 1100 NTU: ±3 % of reading
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