Every magazine or locker will have at least onedirect reading thermometer. It will be located wheremaximum space temperature variations will normallyoccur. It must be installed so it is readily accessible fortaking readings and resetting the index pointers.Special brackets are available to mount thethermometer where it can be protected from accidentaldamage.View A of figure 5-5 shows the internalcomponents of the device. The temperature-sensitiveelement is a single helix low-mass coil (bimetalelement) that fits closely inside the thermometer stem.The bimetal element is carefully sized and aged forlifetime stability and is covered with a fluid to assuregood heat transfer. The fluid also permits maximumspeed of response and reduces pointer oscillationscaused by outside vibrations. The case and stem aremade from stainless steel for strength andanticorrosion protection.View B of figure 5-5 illustrates the dial face of thethermometer. It is 3 inches in diameter. A plasticwindow protects the index pointers. The index resetarm is on the outside of the window and is used to resetthe high-low pointers. Temperature gradations on ourexample are marked off in 20increments. Theapproximate readings on this thermometer are 100F,high; 78F, present; and 55F, low. After you recordthese temperatures, reset the “high” and “low” pointersin line with the “present” pointer. As temperature risesduring the day, the “present” pointer pushes the “high”pointer up the scale. As temperature falls during thenight, the “present” pointer reverses direction andpushes the “low” pointer down the scale. As the suncomes up, the “present” pointer again moves up thescale. Thus, we see three different temperaturereadings. They reflect the temperature variationsthroughout a 24-hour period.The 45spread between the high and low pointersin our example is a bit large. However, it could happen.The reading you must be cautious about is the 100Fhigh. When this occurs, you should turn on themagazine cooling or ventilation system. If thesesystems are not working, you might have to useartificial cooling (fans, blowers). Topside lockers mayrequire cooling with water. Remember, the optimumtemperature should be around 70F.A magazine temperature record card (fig. 5-6) islocated in each magazine and is posted near thethermometer for recording daily magazinetemperatures. These cards are replaced on the first dayof each month. The completed cards are removed fromthe magazine and the temperatures for each month areposted in a permanent log. The magazine temperaturecards must be retained on file for a period of one year.When magazine temperatures are recorded in thepermanent log, temperatures in excess of 100F must5-14POINTERGAUGE DIALPOINTER STEMPROTECTIVE TUBEBIMETALLIC ELEMENTMOUNTINGCASEINDEX RESETMECHANISMINDEXRESET ARMHIGH TEMPERATUREINDEX POINTERPRESENT INDICATINGINDEX POINTERLOW TEMPERATUREINDEX POINTER12014020240FCf05005ABFigure 5-5.—Bimetallic maximum and minimum thermo-meter: A. Internal components; B. Dial face andpointers.DATE MAXIMUMMINIMUMINITIALCOMPARTMENTTHERM. NumberMONTH132456293031MAGAZINE TEMPERATURE RECORD5ND GEN 90 (REV 11-48)P&PO N or Va 11-2-48 99014 (J c 8) 8MFCf05006Figure 5-6.—Magazine Temperature Record Card.
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