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Trang 1STANDARD SPECIFICATIONS
FOR A.S.T.M PARTIAL-IMMERSION THERMOMETER FOR
-20 TO + 150° C., 0 TO +300° F.1 Serial Designation: D 182 - 25 These specificalion!l are i$:!1\Cd under the fixed designation D 18'2; the linal number indicates the year of ori~tinaladoption ns ~tnndanl or, in the case uf l'evi:>ion,
the year of las~ revision
lSSUHD AS TBNTA'rlVI!:, 1923; ADOPTED IN AMBNUI!D f'mtM, 1925
1 These specifications cover a partial-immersion thermometer graduated in either Centigrade or Fahrenheit degrees as specified,
the ranges being -20 to +1S0° C or 0 to +300° F., respectively
2 The purpose of lhcsc specifications is to provide a thcrniom· cter of sufftcient accuracy for general use in determining temperatures
ns required in tests where no standard thermometer is specified and for adoption as a standard where its design is applicable
· · 3 The thermometer shall conform to the following requirements: T\'Pll: Etched ;;tern, gltt~s
LIQUID: Mercury
R ~NG£ AND SuBDIVIsio N: -20 to + 150° C in I • C or 0 to ;-300• F in 2° F ToTAL LBNGTS: 303 to 307 mm (11.94 to l2.ll io.)
S-rnM: Plain front, enamel back, suitable thcrmomclcr tubing Diameter, 6 Lo
7 mm (0.2.36 to 0.275 in.)
Bm.a: Corning normal or Cl!unlly suitable thermometric gl:~ss
Length, 19 to 2S mm (0.75 tu tin.)
Diameter, 5 to 6 rnm (0.196 to 0.236 in.)
DtSTANCll TO -18° C OR 0° J? LINE FROM DOT'fOlof OF BUI.ts: 90 to 100 mrn (3.55
to 3,94 in.),
DtST,t.NC£ ·ro 150° C OR 300° F LINK PROM TOP OP' STIUI: 20 to 35 mm (0 8 to 1.4 in.), FILLING ABOVB M~KCU!n' : Nitrogen gas
ToP FINISH: Glass ring
GRADUATION: All lines, figures and letters clear cut and di11tinct The first and each succeeding s• C or 10• F line to be longer than the remaining lines Gradli· ations to be numbered at each multiple of 10° C or 20° F
htWKRSION: 'fl1e word& "76-mm immersion" on Centigrade tht!rmometers, or
•• 3-in immersion'' on Fahrenheit thermometers and a line around the stem,
75 to 77 rnm (2.96 to 3.04 in.) above the bottom of the bulb, shall be etched
on the thermometer
'Under U1o atandanliU\ti<>n procedure of tl1e Society, th ae apccificnti<lns are untler Lho jncisdicLi<>n
nf theJU:i,1'.M <:.:.m"'iu.ee D·IS ou Tllcrm o mcLc:rs
(911)
Trang 2912 SPECIFICATIONS :FOR PARTIAL-IMMERSION THERMOMETEr<
SPECIAL MARKING: "A.S.T.M.," a serial number and the manufacturer's name
or trade mark shall be etched on the stem
SCALE ERROR: The error at any point of the scale, when the thermometer is standard-ized as provided below, shall not exceecl 0.5° for the Centigrade thermometer
or 1° for the Fahrenheit thermometer
STANDARDIZATION: The thermometer shall be standardized for 76-mm (3-in.) immersion and for the following temperatures of the emergent mercury column These stem temperatures have been chosen as corresponding, on the average, to those like1y to occur in the use of the thermometer
THERMOMETER
READING 50° C (122° F.)
100° C (212° F.)
150° C (302° F.)
MERCURY COLUMN 35° C ( 94° F.) 48° C (!18° F.) 55° C (131 oF.) CAsE: The thermometer shall be supplied in a suitable case on which shall appear the marking: "A.S.T.M -20 to +150° C., 76-mm immersion" or" A.S.T.M
0 to +300° F., 3-in immersion," according to the type of thermometer NoTE.-For the purpose of interpreting these specifications the following definitions apply:
The total length is the over-all length of the finished instrument
The diameter is that measured with a ring gage
The length of the bulb is the distance from the bottom of the bulb to the begin-ning of the enamel backing
The top of the thermometer is the top of the finished instrument