| Operation of Infrared Moisture Balance |
| 1.0 OBJECTIVE 1.1 To lay down the procedure for operation of Infrared Moisture Balance in laboratory. 2.0 SCOPE 2.1 This SOP is applicable for operation of Infrared Moisture Balance. 3.0 RESPONSIBILITY 3.1 QC – Chemist / Officer / Executive 4.0 ACCOUNTABILITY 4.1 Head-QC To read this GTP click here Limit Test for Iron. 5.0 PROCEDURE 5.1 Clean the instrument from outside using clean dry cloth. 5.2 Select MODE, UNIT, TEMPERATURE, TIMER/END PT., PRINT INTERVAL, MEMORY STORE STATUS, AUTO PRINT to suit a particular drying test. 5.3 Though moisture balance can be used with sample weight of 0.005 g and above, it is always recommended to use sample of sufficient weight (at least 2g) for batter accuracy and repeatability of test results. If an accuracy of 0.5% is needed, use at least 5g sample and for 0.1% accuracy at least 15-20g. Sample with lower weight may result in lesser accuracy and repeatability. 5.4 Spread the sample evenly on the pan to make sample heating uniform and also to get better results. 5.5 Do not use a sample that could make a dangerous chemical reaction and cause an explosion or poisonous gas, when the sample is dried. 5.6 Do not use samples which contain volatiles substances, as it will result in incorrect results. 5.7 Do not allow testing samples to absorb moisture from the atmosphere. If required maintain samples at constant temperature. 5.8 When testing samples repeatedly, user must ensure to put samples on a sample pan, which is at room temperature. Placing samples on a hot sample pan may give wrong results in qc, as some moisture may be lost even before the test is begin. 5.9 While doing multiple testing, it is recommended to wait till the temperature of the heating chamber is cooled down to room temperature for better accuracy. 5.10 Ensure to avoid external disturbances like air conditioners or any vibration producing equipment’s from affecting the results. 5.11 Keep sample pan on the pan holder. To read this SOP click here SOP for Entry And Exit Of Staff And Visitors. 5.12 Press tare key to make weight reading zero. 5.13 Put sample on the pan. 5.14 Close the heating chamber. 5.15 Press start/stop key. 5.16 Calibration: 5.16.1 Take disodium tartrate and operate the instrument at 105ºC ± 2ºC for 15 minutes. 5.16.2 Note down the reading from the scale and record in the format in quality control. 5.16.3 Repeat the observation three times and record in the format and the reading should lay between 15.50% to 15.70%. 5.16.4 Calibration Frequency: Every three Month. |