CHECKS WITH ASSISTANCE

Operator Preventive Maintenance Checks and Services - Cont - TM-5-6630-215-12_165

TM-5-6630-215-12 Alarm-Monitor Group (AMG) OA-9431/F88-9(V) CAGEC 97403 Manual
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TM 5-6630-215-12 3-4. CHECKS WITH ASSISTANCE. a. General. If a medical facility, testing laboratory, or other military unit which may have cobalt chloride solution and neodymium chloride solution, is convenient, the following two checks will cer- tify the accuracy of the spectrophotometer. b. Instrument Linearity Check. To determine if your instrument is giving a linear response and to insure that the instrument’s optical system is functioning properly, the following procedure may be used. (1) Fill a clean 50 ml graduate cylinder to the 25.0 mark with cobalt chloride solution. Fill the graduated cylinder to a final volume of 50.0 ml with demineralized water. (2) Repeat step 1 using 20, 15, and 5 ml of cobalt chloride solution and filling each graduated cylinder to a final volume of 50 ml with demineralized water. (3) Insert the % transmittance - absorbance meter scale in the meter and adjust the wavelength dial to 510 nm. (4) Fill a sample cell with demineralized water, place it in the cell holder and set the meter to read 100% T or O absorbance. (5) Place the sample prepared in step (1) in the cell holder and read the absorbance value from the meter scale. (6) Repeat step (5) using the dilutions prepared in step (2). (7) Graph the results on linear paper, plotting the ml chloride solution used for each sample versus the absorbance obtained in figure 3-1. NOTE The results should be a straight line passing through zero as shown by plot A on the graph (fig 3-1). Deviations from a straight line such as plot B may be caused by stray light due to light leakage, optical imperfections or improper optical alignment and maintenance. Turn improper perform- ing instruments in for a replacement. c. Instrument Wavelength Accuracy Check. The wavelength setting on your DR/2 spectrophotometer may be checked in the manner. of cobalt reading dial following (1) Turn the spectrophotometer on and adjust the wavelength dial to 575 nm. Insert the % transmittance - absorbance meter scale in the meter. (2) Fill a sample cell with neodymium chloride solution and place it in the sample cell holder. 3-12

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