S pe c t r a l S e n s o r s by C a r l Ze i s s

I n -lin e A n a ly s is o f t h e c o n c e n t r a t io n o ff la v o u r e d m in e r a l w a t e r s
INT R ODUC T ION

F or a few years now mineral waters have been flavoured
with additives in order to modify the tas te.
T hes e additives , the likes of ”Lemon” for Mineral
Waters , are dis s olved in alcohol and are added to themineral water in strongly diluted form (approx. 1:1000).
T he desired concentration is determined by subjective”tas ting” and then releas ed to the filling facilities . An
evaluation of samples taken before and during the filling
process can provide objective measures of theconcentration of the additives in the final product.
C hemical tes ts on production s amples repres ented
another approach to the problem.
In-line monitoring of the current concentration of theadditives in the production s tream by means ofimmersion probes or flow-though cells provides thepos s ibility of direct proces s control. T hus it is pos s ible
to increas e the continuity of the concentration in the final F igure 1: In-line monitoringproducts.

T HE ME T HOD
T he concentrated flavour additives dissolved in alcohol
generate typical abs orbance in the UV s pectral range.
T he example s hows a real s ample (mineral water‘lemon’) and a dilution s eries of this s ample. (F igure 2)
A tolerance window is s pecified to enable the proces scontrol adjus tment of the added concentration.

F igure 2: S ample〒164‑0011
東京都中野区中央4‑4‑5第一小林ビル
Tel: 03‑5328‑2858 Fax: 03‑5328‑2859

Spectral Sensors by Carl Zeiss

THE SYSTEM
The diode-array spectrometer system MCS551UV based on the established Zeiss MCS polychromator technology
provides spectral information in the UV range with a resolution of 0.8 nm / pixel.
The system is controlled by a PC, different interface types (RS422, 4-20 mA loops or trigger I/O ports) can be applied.
Systems can be cascaded and controlled via one host PC to take measurements in different streams.
THE SOFTWAREThe DM1 software (LabView generated) runs under Windows NT. The process monitoring programme provides a results
display of up to 4 measuring channels. The concentration of the additives in the stream can be displayed as digital
readouts of the current values and/or in form of trend charts. Storage of the results and data transfer via an analog
output are possible.
Digitally controlled devices like e.g. valves or shutters used to switch product or reference streams can be included in
the automated signal processing.

THE BENEFITS♦ Fast and continuous measurement♦ Short analysis and response time
♦ Established and proved system and method♦ High reliability, low maintenance♦ Easy to use software♦ Detailed spectral information available at high speed♦ Fibre optics allow flexibility in installation and location of the system

SYSTEM SPECIFICATIONS
Wavelength range
Wavelength resolution
Wavelength reproducibility
PC interface
Distance between PC and system
Analog output (4-20 mA)
Optical fibres
Housing

Carl Zeiss
Spectral Sensors

200-620 nm (optional 190-1020nm and/or 900-1700 nm)
0.8 nm/diode (2.4 nm Rayleigh)< 0.005 nm
RS 422up to 80m with standard cable
up to 2500m with waveguide transmission
4 channels (standard)quartz, 600 µm core, SMA connector
Max. distance 10 m
19” rack
19” protective housing

D-07740 Jena
Telefon:(03641)64 33 85
Telefax:(03641)64 33 11
E-Mail:info.spektralsensorik@zeiss.de
Internet:
http:\\www.zeiss.de