TM    5-6630-215-12 Table  3-1.  Operator  Preventive  Maintenance  Checks  and  Services  -  Continued NOTE: Within  designated  interval,  these  checks  are  to  be  performed  in  the  order  listed. 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 3-8 B  -  Before D - During A - After W - Weekly CHLORIDE TEST KIT (LOW RANGE)  (fig. 2-14) Case Insert Lab-ware Instructions Chloride  Titrant (Silver  Nitrate) Chloride Indicator Powder   Pillows HARDNESS, TEST KIT (fig. 2-18) Case Insert Lab-ware Instructions Buffer Solution - Hardness  #1 Manver  Hardness Indicator  - Hardness  #2 Titration Solution - Hardness  #3 Potassium  Hydrox- ide  Solution Calver  II,  Powder Pillows SULFATE, TEST KIT (fig. 2-19) Case Insert Instructions Lab-ware Alcohol,  Isopropyl Standard  Barium Chloride   Reagent Visual  Inspection  of: 1 - Cases, fittings & inserts for function. Patch or re- place. 2 - Lab-ware. Broken units are to be replaced. 3 - Shelf life. If expired, re- tain for identification only. Replace. 4 - Containers for leakage and function. Clean up, tighten caps. Replace. M  -  Monthly 1 - Less than the quantity of any type of reagent list- ed  in  Appendix  C,  required to perform function; or, not of effective shelf life. 2 - Leakage of any contain- er is evident (until cleaned up  and  replaced). 3 - Lab-ware is broken or missing to the extent that accurate measurement cannot  be  made. 4  -  Environmental  exposure has been such that contain- ers or contents are unre- liable.