User manual EUTECH INSTRUMENTS WATERPROOF C401 COLORIMETER

[. . . ] Instruction Manual C401/301/201/102/101 Portable Colorimeter 68X357704 Rev. 0 08/04 Technology Made Easy . . . Preface This manual functions in two ways: first as a step by step guide to help you operate the waterproof C401/301/201/102/101 Colorimeter; second, it serves as a handy reference guide. It contains basic instructions that you must follow during the operation, care and maintenance of the instrument. The safety protection provided by this equipment may be impaired if it is used in a manner not described in this manual. [. . . ] 2. 5. 2 Sample Measurement Due to the nature of the test method, concentrations less than 5 ppm Cyanuric Acid are not detectable. Do not leave the sample with added reagent into the vial for more than few minutes after measurement. The test will cause the build up of a cloudy layer on the inside wall of the vial. It is important to thoroughly clean the vial after use to remove this layer because subsequent test results may be affected. 2. 5. 3 Interferences Sample Turbidity: Turbid samples should be filtered prior to analysis. 2. 5. 4 Accuracy Check / User Calibration A stock solution of 1000ppm Cyanuric Acid may be produced by dissolving exactly 1g of Cyanuric Acid in 1 litre of de-ionised water (check the purity of the Cyanuric acid being used; if less than 100%, adjust the amount used accordingly). The stock solution may then be diluted to give a Cyanuric Acid standard. To do this take a portion of the stock solution and make up to 1 litre using de-ionised water (for example, 50ml of stock solution will produce a 50ppm standard). To check the accuracy of the meter: Prepare a standard in the range 20-80 ppm (it is advisable to check a standard at near the concentration usually tested for using the meter). Use this standard in place of the sample water in the above test method. The result obtained should be approximately the value of the standard used (please refer to instrument's specifications for data on meter precision and accuracy). To re-calibrate the meter: All instruments are factory calibrated and user calibration is not recommended. However, if a Cyanuric Acid standard can 17 Measurement: Cyanuric Acid C401/301/201/102/101 be accurately prepared, or measured by a different method or instrument of higher precision and accuracy, then a Cyanuric Acid standard in the 6675 ppm range can be used. 2. 5. 5 Chemistry Cyanuric Acid is commonly used to stabilize the chlorine present in swimming pool water. With correct pool maintenance, Cyanuric Acid build-up is uncommon; however, if correct maintenance is not carried out, the levels may build up until potentially harmful. In the test method, the Cyanuric acid reacts with the sachet reagent, in a conditioned sample, to produce a suspended turbidity. The amount of turbidity produced is proportional to the concentration of Cyanuric Acid. The amount of 525nm light absorbed/scattered by the turbidity is accurately measured by the meter and then converted into the Cyanuric Acid concentration. 18 Measurement: pH C401/301/201/102/101 2. 6 · pH (5. 9-8. 2 pH units) For water and wastewater (Phenol Red Method) Switch the meter on by pressing the ON/OFF key. The meter will read [STbY] indicating it is in stand-by mode, waiting for either blanking or measurement. READ ENTER 1. 3. 4. Select a clean and dry vial, un-screw the cap and fill with sample water to the line on the vial. Ensure the outside of the vial is clean, dry and absent of any marks or finger-prints. Gently place the vial fully into the sample well of the instrument, whilst aligning the mark on the vial with the mark on the meter. [. . . ] The absorbance of the calibration standard is outside the range allowed for the selected calibration point. Corrective Actions Ensure sample value is within the measurement range as listed in the Specification table in Section 7. Ensure sample value is within the measurement range as listed in the Specification table in Section 7. UR *ERR0 Ensure that blanking is done before the chemical reagent is added. Replace calibration standard with a known accurate value and recalibrate. Ensure the vial is fully snapped in the sample well. *ERR1 *ERR2 *ERR3 Lamp Failure. [. . . ]