Criterion Temperature Benchtop Chambers
Temperature chamber models designed to save lab space
The Criterion temperature chamber series provides an economical and space-saving solution for a variety of temperature testing requirements. The chamber's interior size is 3.5 inches wider than traditional benchtops, yet the exterior is 20% narrower. The BTZ-133 chamber uses 115V power, meaning no special power hook-ups.

Lowest temperature: -20, -35, or -70°C （-4, -35, or -100°F）
Highest temperature: 180°C （354°F）
Chamber sizes: 1.5 or 4 cubic feet
Fully programmable with Watlow F4 controller
The extended temperature ranges of the Criterion series make testing at extreme conditions possible without buying a larger, stand alone chamber. Two chamber sizes are available, as well.

The programmer includes a temperature alarm as just one part of ESPEC's three-tiered over-temperature protection system. A thermal fuse and a user-set independent limit are also included. In addition, a specimen power terminal allows the user to safely operate powered equipment inside or with the chamber.

The conditioning components are laid out in a vertical configuration to save bench space.
The Criterion chambers respond quickly to setpoint changes. The BTZ-175 can

Features
High performance and quiet operation （65 dBa）
Space-saving footprint, designed for flush installation to wall
Stainless steel exterior and durable thermoformed plastic door
Full thermal break around doorframe
One 50mm （2"） diameter cable port on left, with flexible silicone plug
Three levels of overheat protection
Detachable eight-foot power cord with plug
WATLOW F4 PROGRAMMER/CONTROLLER
Popular PID controller for test chambers
Stores 40 different profiles （total 256 steps）
Step types include: ramp, soak, jump, auto-start, and end
RS-232C Modbus interface （free standard software）
Criterion Temperature Benchtop Model Comparison

Model / Link Interior Dimensions
（W x D x H） Interior Volume Temperature Range Humidity Control Change Rate
（heat/cool） Notes
      
HBTU-133 19.6" x 11" x 12" 1.5 cu. ft. -35 to 180°C No up to 1.5°C/min. 
HBTZ-133 19.6" x 11" x 12" 1.5 cu. ft. -70 to 180°C No up to 3.5°C/min. 
HBTZ-175 19.6" x 11" x 12" 1.5 cu. ft. -70 to 180°C No up to 5°C/min. 
HBTZ-175E 19.6" x 11" x 12" 1.5 cu. ft. -70 to 180°C No up to 5°C/min. 230V 50Hz export model
HBTU-433 19.6" x 15" x 23.6" 4 cu. ft. -20 to 180°C No up to 1.5°C/min. Also available with humidity control
HBTZ-475 19.6" x 15" x 23.6" 4 cu. ft. -70 to 180°C No up to 2.75°C/min. Also available with humidity control
Click model number for details, including metric & english units.

HBTU-133
1.5 Cubic Foot Criterion Benchtop
Specifications
Item Value
Specifications are for reference only. Please contact ESPEC for detailed information.
Product Family Criterion Temperature Benchtop
Interior Volume  1.5 cu. ft.
42 Liters
Interior Dimensions （W x D x H） 19.6" x 11" x 12"
500 x 280 x 300 mm
Exterior Dimensions （W x D x H） 29" x 34" x 33"
740 x 850 x 840 mm
Temperature Range -35 to 180°C
-31 to 354°F
Average Change Rate
（rates lower with 50Hz power） 1.5°C/min heat & 1.2°C/min cool
 （-15 to 160°C empty chamber, per IEC 60068 3-5, at supply sensor） 
Power  120V 11A max 
Maximum Sound Level （1 meter away） 65 dBA
“Price Rank”
（Comparing to other models in this product category.
Lower Number = Lower Price）
 #1 out of 19 ranked

HBTZ-133
1.5 Cubic Foot Criterion Benchtop
Specifications
Item Value
Specifications are for reference only. Please contact ESPEC for detailed information.
Product Family Criterion Temperature Benchtop
Interior Volume  1.5 cu. ft.
42 Liters
Interior Dimensions （W x D x H） 19.6" x 11" x 12"
500 x 280 x 300 mm
Exterior Dimensions （W x D x H） 29" x 33.3" x 33"
740 x 850 x 840 mm
Temperature Range -70 to 180°C
-100 to 354°F
Average Change Rate
（rates lower with 50Hz power） 3.5°C/min heat & 3°C/min cool
-45 to 155°C （Empty） 
Power  115V 16A max 
Maximum Sound Level （1 meter away） 65 dBA
Temperature Fluctuation （at control sensor） ±0.5
“Price Rank”
（Comparing to other models in this product category.
Lower Number = Lower Price）
 #2 out of 19 ranked

HBTZ-175
1.5 Cubic Foot Criterion Benchtop
Specifications
Item Value
Specifications are for reference only. Please contact ESPEC for detailed information.
Product Family Criterion Temperature Benchtop
Interior Volume  1.5 cu. ft.
42 Liters
Interior Dimensions （W x D x H） 19.6" x 11" x 12"
500 x 280 x 300 mm
Exterior Dimensions （W x D x H） 29" x 33.3" x 33"
740 x 850 x 840 mm
Temperature Range -70 to 180°C
-100 to 354°F
Average Change Rate
（rates lower with 50Hz power） 5°C/min
-45 to 155°C （Empty） 
Power  208/230V 1ph 12A max 
Maximum Sound Level （1 meter away） 65 dBA
Temperature Fluctuation （at control sensor） ±0.5
“Price Rank”
（Comparing to other models in this product category.
Lower Number = Lower Price）
 #3 out of 19 ranked

HBTZ-175E
1.5 Cubic Foot Criterion Benchtop （50Hz）
Specifications
Item Value
Specifications are for reference only. Please contact ESPEC for detailed information.
Product Family Criterion Temperature Benchtop
Interior Volume  1.5 cu. ft.
42 Liters
Interior Dimensions （W x D x H） 19.6" x 11" x 12"
500 x 280 x 300 mm
Exterior Dimensions （W x D x H） 29" x 33.3" x 34"
740 x 850 x 865 mm
Temperature Range -70 to 180°C
-100 to 354°F
Average Change Rate
（rates lower with 50Hz power） 5°C/min
-45 to 155°C （Empty） 
Power  230V 1ph 50Hz 12A max 
Maximum Sound Level （1 meter away） 65 dBA
Temperature Fluctuation （at control sensor） ±0.5°C
Temperature Gradient （Uniformity, empty） ±2°C below 100°C
Notes 230V 50Hz export model
“Price Rank”
（Comparing to other models in this product category.
Lower Number = Lower Price）
 #3 out of 19 ranked

HBTU-433
4 Cubic Foot Criterion Benchtop
Specifications
Item Value
Specifications are for reference only. Please contact ESPEC for detailed information.
Product Family Criterion Temperature Benchtop
Interior Volume  4 cu. ft.
113 Liters
Interior Dimensions （W x D x H） 19.6" x 15" x 23.6"
498 x 380 x 600 mm
Exterior Dimensions （W x D x H） 29" x 33.35" x 45.6"
737 x 847 x 1159 mm
Temperature Range -20 to 180°C
-4 to 354°F
Average Change Rate
（rates lower with 50Hz power） 1.5°C/min heat & 1.2°C/min cool
 （Empty） 
Power  120V 
Notes Also available with humidity control
“Price Rank”
（Comparing to other models in this product category.
Lower Number = Lower Price）
 #4 out of 19 ranked

HBTZ-475
4 Cubic Foot Criterion Benchtop
Specifications
Item Value
Specifications are for reference only. Please contact ESPEC for detailed information.
Product Family Criterion Temperature Benchtop
Interior Volume  4 cu. ft.
113 Liters
Interior Dimensions （W x D x H） 19.6" x 15" x 23.6"
498 x 380 x 600 mm
Exterior Dimensions （W x D x H） 29" x 33.35" x 45.6"
737 x 847 x 1159 mm
Temperature Range -70 to 180°C
-100 to 354°F
Average Change Rate
（rates lower with 50Hz power） 2.75°C/min heat & 2.5°C/min cool
 （Empty） 
Power  208/230V 1ph 12A max 
Temperature Fluctuation （at control sensor） ±0.5
Notes Also available with humidity control
“Price Rank”
（Comparing to other models in this product category.
Lower Number = Lower Price）
 #8 out of 19 ranked