ASTM D182 − 25 Specification for ASTM Thermometer (Withdrawn 1939)

STANDARD SPECIFICATIONS

FOR

. A.S.T.M. PARTIAL-IMMERSION THERMOMETER FOR
GENERAL USE,
-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 SuBDIVIsioN: -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 apccificntin
nf theJU:i,1'.M . <:.:.m"'iu.ee D·IS ou TllcrmomcLc:rs.

(911)

912 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 AVERAGE TEMPERATURE OF EMERGENT
READING MERCURY COLUMN

50° C. (122° F.) 35° C. ( 94° F.)
100° C. (212° F.) 48° C. (!18° F.)
150° C. (302° 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 begin-

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
ning of the enamel backing.
The top of the thermometer is the top of the finished instrument.