3
Benchtop Features
Models save valuable lab space
ESPEC introduces our expanded Criterion Series. With a
narrower footprint and increased performance, these test
chambers provide an economical and space-saving solution
for cramped labs needing to do a variety of temperature (and
humidity) testing.
All of the Criterion models have a 19.5 inch wide interior,
which is 3.5 inches more than traditional benchtops, yet the
exterior is 20% narrower. The four cubic foot models have the
largest workspace found in a benchtop unit, while maintain-
ing the smallest exterior footprint.
For additional space savings, the refrigeration system ven-
tilates out the top, and utility connections are on the sides,
thus allowing installation directly against a wall. With the elec-
trical system behind the hinged control panel, minimal space
allowance is required on the sides, as well.
Big chamber performance
The extended temperature ranges of the Criterion series
make testing at extreme conditions possible without buying
a larger, stand-alone chamber. Units are available that go as
cold as -70°C.
The four cubic foot models also offer a choice of humidity
control. With a range from 10 to 95%, you can maximize your
testing options. A low humidity system can extend this range
even farther. (See humidity chart on page 7 for details.)
Faster temperature changes
The Criterion series can cycle temperatures at rates up to
5°C/minute without requiring liquid nitrogen. Signicant test
time can be saved, as well as creating added thermal stress
on your samples.
To demonstrate performance, ESPEC uses the international
standard IEC 60068 3-5 measured at the supply air. Tem-
perature cycles are run from hot to cold extremes, and the
middle 80% of the transition is timed to determine perfor-
mance. Your actual cycling results will vary depending on
methodology, including the start and end temperatures, and
the amount of samples loaded.
(°C)
Extreme temperatures possible
150°100°50°0°-50° 200°
BTZ & BTX
all models
BTU & BTL
all models
-70° 180°
-20° 180°
Temperature Comparison
The BTZ & BTX models have extended cold temperature
ranges without requiring liquid nitrogen. The BTU & BTL still
offer sub-freezing testing capability.
The Criterion series has two chamber sizes: 1.5 and 4 cubic
feet. The interior width for both sizes is 19.5 inches. The
exterior footprint for both sizes is the same, just 30" x 33.5".
1.5 cu. ft. 4 cu. ft.
12"
11"
24"
15"
BTZ-175: 5°C/m
BTZ-133: 3.5°C/m
-100
-50
50
100
150
0
-70
180
30 600 90 120 150 180
min.
The Criterion chambers respond quickly to setpoint changes.
The BTZ-175 can save 30 minutes or more per cycle.
Performance Comparison
Temperature Range Comparison
Size Comparison
(13 pages)
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