ASTM E715-80(2006)

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Designation: E715 – 80 (Reapproved 2006)
Standard Specification for
Gravity-Convection and Forced-Circulation Water Baths
This standard is issued under the fixed designation E715; 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 (´) 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.
2. Classification
4.1.1 Place five calibrated temperature sensors in the un-
2.1 This specification covers the following four types of
loaded water bath with diffuser plate in place and at lowest
water baths:
position and water level approximately 38 mm (1.5 in.) from
2.1.1 Type IA—A gravity-convection bath having a unifor-
the top. Temperature sensors may be platinum resistance
mity of temperature not greater than 62 % of the differential
elements or thermistors having a time constant of 2.5 s or less,
between ambient and operating temperature.
or thermocouples made of iron or copper-constantan wire
2.1.2 Type IB—A gravity-convection bath having a unifor-
approximately 0.5 mm (24-gauge) in diameter and having a
mity of temperature not greater than 64 % of the differential
junction size not larger than 2 mm (0.08 in.). Locate one sensor
between ambient and operating temperature.
in each of the four corners of the bath approximately 50 mm (2
2.1.3 Type IIA—A forced-circulation bath having a unifor-
in.) from each wall and midway between the diffuser plate and
mity of temperature not greater than 61 % of the differential
the water surface. Locate the fifth sensor within 25 mm (1 in.)
between ambient and operating temperature.
of the geometric center of the bath. Cover the bath either with
2.1.4 Type IIB—A forced-circulation bath having a unifor-
the standard cover used with the bath or a flat sheet of stainless
mity of temperature not greater than 62 % of the differential
steel. If necessary, holes may be made in the cover, in the
between ambient and operating temperature.
proper locations to accommodate the sensors. Rubber stoppers
NOTE 1—Uncovered water baths will generally have uniformities shall be used to plug the holes in order to minimize vapor loss.
broader by an additional 0.1°C.
NOTE 2—If calibrated thermocouples are not available, five thermo-
couples made from the same spool of wire may be used, provided they
3. Performance Requirements
give the same value for temperature when placed adjacent to one another
3.1 The temperature within the bath chamber shall be
in the bath at test temperature.
controllable by an automatic device and shall be uniform
4.1.2 Bring the bath to the desir
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