1.1.1 The Tag Closed Tester shall consist of the test cup, lid with ignition source, and liquid bath conforming to the following requirements:
1.1.2 Test Cup, of brass or other nonrusting metal of equivalent heat conductivity, conforming to dimensional requirements prescribed in Fig. A1.1.
1.1.3 Lid:
1.1.3.1 The lid comprises a circle of nonrusting metal with a rim projecting downward about 15.9 mm (5/8 in.), a slide shutter, a device which simultaneously opens the shutter and depresses the ignition source, and a slanting collar in which the cup-temperature measuring device ferrule is inserted. Fig. A1.2 gives a diagram of the upper surface of the lid, showing dimensions and positions of the three holes opened and closed by the shutter, and the size and position of the opening for the cup temperature measuring device.
1.1.3.2 The rim shall fit the collar of the liquid bath with a clearance not exceeding 0.4 mm (0.002 in.) and shall be slotted in such a manner as to press the lid firmly down on the top of the cup when the latter is in place in the bath. When this requirement is not met, the vertical position of the cup in the bath shall be suitably adjusted, as by placing a thin ring of metal under the flange of the cup.
1.1.3.3 The shutter shall be of such size and shape that it covers the three openings in the lid when in the closed position and uncovers them completely when in the open position. The nozzle of the flame-exposure device, when used, shall conform to the dimensions given in Table A1.1. The ignition source device shall be designed and constructed so that opening the shutter depresses the tip to a point approximately 2 mm (0.08 in.) to the right of the horizontal center of the middle opening of the lid (refer to lower part of Fig. A1.3). This will bring the ignition source to the approximate center of the opening. The plane of the underside of the lid shall be between the top and bottom of the tip of the ignition source when the latter is fully depressed.
1.1.3.4 The collar for the cup-temperature measuring device ferrule shall be set at an angle that permits placement of the temperature measuring device with its bulb approximately in the horizontal center of the cup, at a depth prescribed in Table A1.1.
1.1.4 Liquid Bath, conforming to the limiting or minimum dimension shown in Fig. A1.3. It shall be of brass, copper, or other noncorroding metal of substantial construction. Sheet metal of about No. 20 B&S gage (0.812 mm) is satisfactory. It may, if desired, be lagged with heat-insulating material to facilitate control of temperature.
1.1.5 Heater, of any type (electric, gas, alcohol, and so forth) capable of controlling temperature as required in Section 9. An external electric heater, controlled by a variable voltage transformer, is recommended.
1.1.6 Bath Stand - For electric heating, any type of stand may be used. For alcohol lamp or gas burner, a stand, as illustrated in Fig. 1, to protect the ignition source from air currents (unless tests can be made in a draft-free room) is required.
