Tham khảo tài liệu 'central boiler plants episode 1 part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | TM 5-650 to the boiler. For the most satisfactory performance especially in large steam distribution systems it is recommended that both morpholine and cyclohexylamine be used in a 75 25 or 50 50 ratio of morpholine cyclohexylamine. When using a mixture of amines the minimum pH point must be determined locally through on-site chemical analysis of the condensate throughout the system. 5 Procedure. a Rinse three of the combination mixing tubes with the sample to be tested. Fill them to the first mark 5 ml with the sample wipe dry and place in the holes back of the three slots in the Taylor base. The two outside tubes act as blanks to eliminate the effect of color and turbidity on the sample. b To the middle tube add ml of Cresol Red. Taylor R-1003K-D . c Remove the tube from the base and mix thoroughly using a clean stirring rod. Replace the tube in the middle hole. d Place the Cresol Red pH slide comparator pH to on the base so that one of the white lines on the slide is directly above the line on the base. e Make comparison with the standards by holding the comparator toward a window or perferably placing it on the shelf in front of the Taylor Dalite lamp. Do not use fluorescent light. f If the color of the middle tube does not match the color of either of the standards or lies between the colors of the two standards move the slide to the right or left as required until the next line on the slide is directly above the line on the base. g If the color of the middle tube exactly matches one of the standards read the pH value directly from the slide. If however the color of the sample lies between the colors of two consecutive standards the pH is taken as an average of the two. h Never consider a match with the lowest or highest standard as an accurate determination. The actual pH may be beyond the range of the indicator. i Should a match appear to be likely with the lowest or highest pH color standard on the slide repeat the test using a fresh sample and
