M Note : /n taking the cooling water sample, if the water in auxiliary tank were taken, it is hard , to measure the accurate density. Take the cooling water sample necessarily loosen- ing the cooling water discharge plug. \ (2) At the state of a test paper soaked in the sampled water, after taking the paper out through water agitation, shake off the water. (3) Wait for about 45 sec. till the color change of test paper. A : Note : However, (4) Make | it should not elapse longer than 75 sec, and if it did, the hue would change. the numerical value by comparing the test paper which hue has changed with the color list of label on storage bottle.
; (5) By comparing the hue changed into yellowish green or so with the green color indication of test paper storage bottle, confirm the density. (Then; the density indication must be in i the hue range of 33% to 50%). ( (6) The brown at the middle of test paper and the lower pink color indication represent the additive state for rust prevention, and the proper range is that the meeting numerical value of brown (vertical) and pink color (horizontal) locates in the range of 0.3 to 0.8 at the color list of label on the test paper storage bottle.
(7) In case of less than 0.3, replenish the additive for rust prevention (DCA4), more than 0.8, pour out the cooling water about 50% i Vo of Anti-freeze in winter Ambient Cooling water (%) Anti-freeze (%) Over -10 85 15 -10 80 20 -15 73 27 -20 67 33 -25 60 40 -30 56 44 -40 50 50 Temperature (°C) \ i c NS : , and then readjust the density after refilling with clean fresh water. @ Amount -21- and in case of