OMA-300-CM, a process color monitor by high resolution diode array spectroscopy. Providing tristimulus analysis using the visible spectrum from 340 nm to 720 nm. The results of the analysis can be displayed on screen and sent to the analog outputs, or further processed to provide a single number such as the APHA value computed in accordance with ASTM method D5386-93. This method converts CIE tristimulus color measurement of light transmitted through near-clear liquid samples to equivalent visual color rating (Hazen or APHA). Process monitoring in the low 0-30 APHA range is feasible due to the multi wavelength nature of the measurements. Also offering higher reproducibility and accuracy in color measurements conforming with the following methods: Saybolt (D-156), Platinum – Cobalt (D-1209) and Dyed Aviation Gasoline (D-2392).

Principle of operation

A diode array spectrophotometer measures the total transmitted light through the flow cell, the measurements are converted, by the analyzer’s CPU, to CIE X Y Z tristimulus color. These values are converted, if required, to the yellowness index or any other color standard.

Verification

Verification of analyzer’s performance is carried out by the manufacturer prior to shipment. The absorbance values of a solution of platinum – cobalt must fall within a limit as specified by the ASTM method. The user will use a filter to simulate these measurement in the field and to confirm analyzer’s performance.    

The OMA-300-CM process analyzer is offered either as a general purpose or purged (explosion-proof) to comply with hazardous area classification. All measurements are continuous. The analyzer utilizes fiber optics to transmit light to and from the flow cell. Industry standard 4-20mA output signals are available and easily re-scaled. User friendly interface, no calibration required.