ASTM E715-80(2001)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: E 715 – 80 (Reapproved 2001)
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.
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
operations. It is applicable to gravity-convection and forced- ambient and test
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.
4.1.1 Place five calibrated temperature sensors in the un-
2. Classification
loaded water bath with diffuser plate in place and at lowest
2.1 This specification covers the following four types of
position and water level approximately 38 mm (1.5 in.) from
water baths:
the top. Temperature sensors may be platinum resistance
2.1.1 Type IA—A gravity-convection bath having a unifor-
elements or thermistors having a time constant of 2.5 s or less,
mity of temperature not greater than 6 2 % of the differential
or thermocouples made of iron or copper-constantan wire
between ambient and operating temperature.
approximately 0.5 mm (24-gage) in diameter and having a
2.1.2 Type IB—A gravity-convection bath having a unifor-
junction size not larger than 2 mm (0.08 in.). Locate one sensor
mity of temperature not greater than 6 4 % of the differential
in each of the four corners of the bath approximately 50 mm (2
between ambient and operating temperature.
in.) from each wall and midway between the diffuser plate and
2.1.3 Type IIA—A forced-circulation bath having a unifor-
the water surface. Locate the fifth sensor within 25 mm (1 in.)
mity of temperature not greater than 6 1 % of the differential
of the geometric center of the bath. Cover the bath either with
between ambient and operating temperature.
the standard cover used with the bath or a flat sheet of stainless
2.1.4 Type IIB—A forced-circulation bath having a unifor-
steel. If necessary, holes may be made in the cover, in the
mity of temperature not greater than 6 2 % of the differential
proper locations to accommodate the sensors. Rubber stoppers
between ambient and operating temperature.
shall be used to plug the holes in order to minimize vapor loss.
NOTE 1—Uncovered water baths will generally have uniformities
NOTE 2—If calibrated thermocouples are not available, five thermo-
broader by an additional 0.1°C.
couples made from the same spool of wire may be used, provided they
give the same value for temperature when placed adjacent to one another
3. Performance Requirements
in the bath at test temperature.
3.1 The temperature within the bath chamber shall be
4.1.2 Bring the bath to
...