DOD A-A-54795-1993 WATER TESTING KIT BACTERIOLOGICAL《细菌学的水测试工具》.pdf

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1、e a A-A-54795 = 9999974 OLZLL7b 383 A-A-54795 11 January 1993 COMMERCIAL ITEM DESCRIPTION WATER TESTING KIT, BACTERIOLWICAL The General Services Administration has authorized the use of this Commercial Item Description as a replacement for Military Specification MIL-W-36258D which is cancelled. This

2、 Commercial Item Description covers a bacteriological water analysis kit, suitable for determining the potability of drinking water Salient characteristics: General. analysis kit using the membrane filter technique for determining total coliform in water under field conditions. The water analysis ki

3、t shall include a sanikarians kit, and an incubator that is electrically operated and includes multi-voltage selection. The sanitarians kit shall be designed to vacuum filter water samples through microporous filters. The incubator shall be operable from multi-voltage supply lines that include 12 an

4、d 24 volts DC, and 115 and 230 volts, 50/60 Hz AC. ambient temperatures ranging form -30F to 95OF. The incubator shall have the capacity to simultaneously accommodate 24 test samples that are held in 12 x 50 mm commercial size plastic Petri culture dishes that include media absorbent pads. Shall be

5、a self-contained bacteriological water The incubator shall be operable in Desian and construction. water analysis kit shall conform to Figures 1 and 2. The design and construction of the The complete water analysis kit shall be enclosed in a fiberglass-reinforced plastic carrying case (container) of

6、 such size and weight as to permit hand carrying by one man. The kit shall be provided with an incubator with operating controls, an incubator rack, a filter holder assembly with supporting base, a funnel assembly, a filter support assembly, a vacuum filter flask, repair parts and tools. AMSC N/A FS

7、C 6665 DISTRIBUTION STATEMENT A. distribution is unlimited. Approved for public release; Licensed by Information Handling ServicesA-A-54795 I 9999974 0121177 21T I A-A-54 7 9 5 Q case. The carrying case shall have maximum overall dimensions (without handle) of 15 inches long by 10 inches wide by 10

8、inches high. All corners and edges shall be round. throughout, and shall be capable of withstanding rough handling under field conditions. carrying handle shall be securely mounted on top of the cover . The carrying case shall be provided withaa dufficient number of pull/down corrosion-resisting met

9、al clamps of suitable size and tension to afford a rainproof and slashproof closure. The carrying case shall be so designed that the cover may be opened to a maximum position of 90 without the front end of the case lifting from the surface. A plastic holding device (insert) shall be mounted on the i

10、nside of the cover to hold the following components securely in place: Case shall be moisture and mold-resistant A plastic, collapsible A Sanitarians syringe for cutout wAn. A 4 ounce polyethylene screw cap bottle for cutout *BV1. A graduated sampling cup for cutout *lCn. A package of Endo broth for

11、 cutout IID1*. An 8 ounce polypropylene bottle with phenolformaldehyde screw cap for cutout *%“. As indicated in Figure 1, a pressure-sensitive plate shall be securely mounted on the outside of the carrying case at a position alongside the receptacle. permanently and legibly marked in red with the f

12、ollowing or a similar legend: The plate shall be nCATION: Set voltage selector switch prior to plugging in power cord.w 2 Licensed by Information Handling ServicesI A-A-54795 W 9999974 OL2LL78 L5b W A-A-54 7 9 5 ontrols, The incubator controls shall be Ca able O Incubator c g of maintaining an incub

13、ation within the incubator cavity in ambient temperatures varying from -30F to 95OF. A voltage selector switch shall allow the incubator to operate from 12 and 24 volt DC supply lines, and from 115 and 230 volt 50/60 Hz AC supply lines. As indicated in Figure 1, a control panel shall be mounted in t

14、he carrying case to hold the voltage selector switch, a temperature control dial, a pilot light, and a fuse holder. A male ottwist-lockgo type receptacle shall be mounted on the line cord for the voltage supply. gasket-mounted and recessed, and shall be supplied with a captive cover for protective c

15、overing when not in use. A bellows type thermostat shall be included for the incubator temperature control. The bulb of the thermostat shall include a protective metal shield and shallbe located in the bottom of the incubator cavity. The front and rear of the control panel shall include recesses to

16、house the power line cord and container for holding accessories and repair parts. temperature of 35Oc +. 0.5 c I outside of the carrying case, to accommodate an external The receptacle shall be Incubator rack. conforming to Figure 2 shall be provided for holding Petri culture dishes intended for sim

17、ultaneous incubation. The incubator rack shall have the overall capacity to accommodate 24 12 x 50 mm commercial size Petri culture dishes. The cross wire construction shall form wells to accommodate not less than 48 13 x 100 mm size test tubes in an upright position with the bottom shelf as a suppo

18、rt for the test tube bottoms. The frame, as a minimum dimension, shall be formed from 0.134 inch diameter (No. 10 Birmingham (B.W.) gauge) wire. The cross wires, as a minimum dimension, shall be formed from 0.083 inch diameter (No. 14 B.W. gauge) wire. The wires shall be securely welded or brazed in

19、 position. A square corrosion-resisting wire rack 3 Licensed by Information Handling ServicesA-A-54795 m 9999974 OL2LL79 o92 m A-A- 5 4 7 9 5 Sanitar ianls kit . A sanitarians kit shall be supplied, and shall consist of a metal syringe with a twoLway valve, and a sampling cup. The syringe and sampli

20、ng cup shall conform to Figure 2 and shall be dimensioned to fit into cutouts IrABr and respectively of the carrying case cover insert of Figure 1. The syringe with plunger in the closed position shall be 7-1/2 inches long and shall be fabricated from chrome-plated brass or corrosion-resisting steel

21、. barrel of the syringe shall include legible instructions for using the syringe. A 7-1/2 inch long fluorelastomer tube shall be attached to the inlet of the syringe by means of a luer adapter type termination. The other end of the fluorelastomer shall terminate with a nylon luer-tapered adapter. Th

22、e sampling cup shall be fabricated from corrosion-resisting steel that is .O007 to ,017 inch thick, and shall include graduations indicated in Figure 2. The external surface of the sampling cup shall have a No. 7 commercial mirror finish, The inside surface shall have a satin finish. The sampling cu

23、p shall be used to collect a water test sample, and shall have a capacity of 250 ml. The Filter holder sumort a ssemblv. A filter holder support assembly shall be supplied to vacuum filter the water sample through an inserted microporous disc filter: The attachment of the valved syringe (from the sa

24、nitarians kit) shall provide the vacuum pump action, The filter holder support assembly shall consist of the following: A funnel assembly with a locking ring (see Figure 1. A filter holder assembly with a support base and a removable screen (see Figure i). A beaker type vacuum filter flask (see Figu

25、re 1). 4 Licensed by Information Handling ServicesA-A-54795 m 9999974 OLZLLBO 804 m A-A-54795 The filter holder support assembly shall be designed to be assembled for filtering water samples, in accordance with the following: A microporous filter is placed on the screen of the support base with the

26、grid side of the filter in the I “upr position. The funnel assembly is attached to thefilter holder assembly and locked in place by turning its locking ring to form a leak proof seal. The supporting base of the filter holder assembly is fitted into the vacuum filter flask to form a leakproof seal .

27、The support base of the filter holder assembly shall be sterilizable by the action of formaldehyde bactericidal gas produced by an incomplete combustion of methyl alcohol. formaldehyde bactericidal gas shall be producible in accordance with the following procedure: The The funnel assembly without a

28、microporous filter disc is attached to the filter holder assembly. The wick attached to the filter holder is moistened with methyl alcohol and then ignited. The vacuum filter flask is placed face down over the burning methyl alcohol to produce the bactericidal formaldehyde gas. Funnel ass emblv. cor

29、rosion-resisting steel 100 mi capacity (minimum) funnel, 0.036 inch minimum thick of a general funnel design. The base shall be collared with an aluminum locking ring with nylon plastic rollers (wheels) suitably positioned on the inside. These rollers shall facilitate a twist-type locking action of

30、the locking ring. shall be so designed that turning the locking ring clockwise shall cause the funnel assembly to lock securely in place and afford a leakproof seal. A vacuum of 25-26 inches of mercury in the system shall not drop below 20 inches of mercury within a period of 20 minutes, when tested

31、, as specified in the Quality Assurance Provisions for “Leakage test“ . The funnel assembly shall consist of a The filter support assembly 5 Licensed by Information Handling ServicesA-A-5q795 m 9999974 OLZLLBL 740 m A-A-54 7 9 5 Filter holder assemblv. be fabricated of smooth finish corrosion-resist

32、ing steel and shall consist of a removable screen (100-mesh minimum) assembly and the filter base upon which it shall be centrally positioned as shown in Figure 2. Sumortina ba se. aluinum alloy of sufficient weight to afford stability for the complete filter holder assembly, and shall be in accorda

33、nce with Figure 2. A wick composed of a woven non- asbestos fiber and is l/l-inch nominal width shall be contained in a recess around the top of the base and shall serve to sterilize the filtering components by means of formaldehyde gas (produced by the incomplete combustion of methyl alcohol). Two

34、Buna-N-Rubber O-rings shall be contained in groves around the perimeter ofthe base to afford a complete seal with the vacuum filter flask. outlet evacuator hole of luer taper design shall connect to the bottom inner well of the supporting base. nylon plastic feet shall be provided in a manner to aff

35、ord stability to the supporting base. release grooves on the perimeter to provide assistance in removing the support base from the vacuum filter flask. The filter support assembly shall The supporting base shall be fabricated of An Three or four There shall be two Vacuum f ilter fl ask. The vacuum f

36、ilter flask shall be a corrosion-resisting steel beaker, 0.031 inch thick (No. 22 U.S. Standard gauge) minimum, and shall be not less than 590 ml capacity. The rim of the filter flask shall be so formed that it permits formaldehyde gas sterilization and also forms a leakproof seal with the two O-rin

37、gs on the sides of the supporting base. 6 Licensed by Information Handling ServicesA-A-54795 m 9999974 Ol12LL82 687 m A-A-54 7 9 5 ssories. reDair Darts and toolsL The fllowing shall be furnished with the water testing kit: a Acte One (1) each Forceps, Straight, Flattened Tips, 4-1/2 inches, corrosi

38、on-resisting steel. One (1) each Pencil, Marking, Red for glazed surface marking . One (1) Cord, Electrical, 3-conductor, No. 18AWG, Type SVT or SV with a 3-conductor male plug at one end and a twist lock female receptacle at the other end for mating with the recessed receptacle on the case. One(1)

39、each Container, Plastic, translucent, flexible, containing the following: One (1) each Lamp, indicator, clear, 14.4 volts, G 3-1/2 53, bayonet type. Five (5) each Fuse, cartridge, AGC, 5 amperes, 250 volts. One (1) each Adapter plug, continental. Wrench, Allen for control knobs. Battery adapter, all

40、igator clip assembly. Envelope containing two (2) nylon lockwheels, two (2) No. 4-40 thread by 1/4 inch long flathead screws, two (2) Allen set screws, and one (1) Allen wrench for set screws. Worlanan shiD. defects which detract from its appearance or impair its serviceability . The water testing k

41、it shall be free from Unit. Each (EA). One water testing kit, as specified, constitutes one unit. 7 Licensed by Information Handling ServicesA-A-54795 M 9999974 0323383 513 M A-A-54795 QUALITY ASSURANCE PR OVISIONS. Resnonsibutv for insnection. Unless otherwise specified in the contract or purchase

42、order, the contractor is responsible for the performance of all inspection requirements as specified herein. purchase order, the contractor may use his own 05 any facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Govern

43、ment reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. Except as otherwise specified in the contract or Records. Records of examinations and tests perform

44、ed by or for the contractor shall be maintained by the contractor and made available to the Government upon request, at any time, or from time to time, during the performance of the contract and for a period of three years after delivery of the supplies to which such records relate. Insriect ion, In

45、spection, as used herein, is defined as both examination (such as visual or auditory investigation without the use of special laboratory appliances or procedures) and testing (determination by technical means of physical and chemical properties) of the item. InsDections and testincr. Inspections and

46、 testing shall be conducted on the water testing kit in accordance with commercial practice. conducted in accordance with commercial practice. Tests shall also requirements that include, but shall not be limited to, the following: ODeration Test. Each water testing kit shall be electrically checked

47、to demonstrate its proper operation at each voltage level on the voltage selector switch. Sampling for the inspections and testng shall be be included to determine compliance with specification 8 Licensed by Information Handling ServicesI A-A-54795 9999974 0121184 45T A-A-54 795 Bakaae test. A filte

48、r holder support assembly shall be selected and assembled by securing the supporting base of the filter holder assembly into the vacuum filter flask to form a leakproof seal. shall be connected by a tube to a vacuum pump with a capability of producing a vacuum of 25 inches of mercury. A 0.45 micron

49、pore size filter shall be completely saturated with water and then placed into the filter holder. The vacuum pump connected to the supporting base shall be operated to obtain a vacuum of 25-26 inches of mercury inside the filter holder assembly. After obtaining the 25-26 inches of mercury vacuumatic pressure, the connecting tube shall be clamped to prevent any flow of air through the evacuator hole, and the vacuum pump operation shall then be stopped. After a 20 minute waiting periqd, the vacuum inside the filter holder shall be measured by a suitable instrument. dropped below