ASTM E715-80(1996)e1

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
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e1
Designation: E 715 – 80 (Reapproved 1996)
Standard Specification for
Gravity-Convection And Forced-Circulation Water Baths
This standard is issued under the fixed designation E 715; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
e NOTE—Keywords were added editorially in January 1997.
TABLE 1 Performance Requirements for Baths
1. Scope
Type Type Type Type
1.1 This specification covers the performance requirements
Characteristic
IA IB IIA IIB
for general-purpose water baths ordinarily used in testing
Uniformity (differential between 24 1 2
ambient and test
operations. It is applicable to gravity-convection and forced-
temperature), 6 %
circulation water baths operating in the range from 5°C above
Maximum time constant, min 26 26 20 20
ambient to 100°C and having a water volume up to 100 L.
1.2 This specification covers unloaded, covered water baths.
loaded water bath with diffuser plate in place and at lowest
2. Classification
position and water level approximately 38 mm (1.5 in.) from
2.1 This specification covers the following four types of
the top. Temperature sensors may be platinum resistance
water baths:
elements or thermistors having a time constant of 2.5 s or less,
2.1.1 Type IA—A gravity-convection bath having a unifor-
or thermocouples made of iron or copper-constantan wire
mity of temperature not greater than 6 2 % of the differential
approximately 0.5 mm (24-gage) in diameter and having a
between ambient and operating temperature.
junction size not larger than 2 mm (0.08 in.). Locate one sensor
2.1.2 Type IB—A gravity-convection bath having a unifor-
in each of the four corners of the bath approximately 50 mm (2
mity of temperature not greater than 6 4 % of the differential
in.) from each wall and midway between the diffuser plate and
between ambient and operating temperature.
the water surface. Locate the fifth sensor within 25 mm (1 in.)
2.1.3 Type IIA—A forced-circulation bath having a unifor-
of the geometric center of the bath. Cover the bath either with
mity of temperature not greater than 6 1 % of the differential
the standard cover used with the bath or a flat sheet of stainless
between ambient and operating temperature.
steel. If necessary, holes may be made in the cover, in the
2.1.4 Type IIB—A forced-circulation bath having a unifor-
proper locations to accommodate the sensors. Rubber stoppers
mity of temperature not greater than 6 2 % of the differential
shall be used to plug the holes in order to minimize vapor loss.
between ambient and operating temperature.
NOTE 2—If calibrated thermocouples are not available, five thermo-
NOTE 1—Uncovered water baths will generally have uniformities
couples made from the same spool of wire may be used, provided they
broader by an additional 0.1°C.
give the same value for temperature when placed adjacent to one another
in the bath at test temperature.
3. Performance Requirements
4.1.2 Bring the bath to the desired temperature and allow it
3.1 The temperature within the bath cham
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