| Criterion Temperature & Humidity Benchtop Chambers Our largest benchtop humidity chamber The Criterion temperature/humidity chamber series provides an economical and space-saving solution for a variety of testing requirements. The chamber's interior size is 3.5 inches wider than traditional benchtops, yet the exterior is 20% narrower. The BTL-433 model uses 115V power, meaning no special power hook-ups. - Lowest temperature: -20 or -70°C （-4 or -100°F）
- Highest temperature: 180°C （354°F）
- Humidity range: 10 to 95% RH
- Chamber size: 4 cubic feet
- Fully programmable with Watlow F4 controller
The four cubic foot workspace is the largest to be found in a benchtop unit, while requiring less footprint than even smaller comparable chambers. The vertical configuration saves bench space, plus the refrigeration’s ventilation design allows installation against a wall for even more space savings. 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. 
HONGZHAN Expertise in Humidity Control Controlling humidity in a small environmental chamber can be especially challenging. HONGZHAN expertise in humidity control brings inligent design that is carefully integrated into the Criterion chambers. The humidity subsystems are designed for reliability, convenience, and performance: - An external steam generator allows expanded range and is easy to maintain.
- A separate de-humidification coil improves low humidity control and range.
- Wet-bulb humidity sensor is a “primary measurement method” for accuracy. It is also economical, easy to maintain, and reliable because it has no risk of failure due to over-saturation. （Read why analog is preferred over digital.）
- Direct water supply connection is standard, with options for water filtering and recirculating water tank.
Features - 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
- 115V main power for BTL--433 model
- High performance and quiet operation （65 dBa）
- Easy lift-off service panels
WATLOW F4 PROGRAMMER/CONTROLLER - Popular PID controller for test chambers
- Stores 40 different profiles （total 256 steps）
- Step types include: ramp, soak, jump/repeat, auto-start, and end
- RS-232C Modbus interface （free standard software）
Criterion Temperature & Humidity Benchtop Model Comparison | Model / Link | Interior Dimensions
（W x D x H） | Interior Volume | Temperature Range | Humidity Control | Change Rate
（heat/cool） | Notes | | | | | | | | | | HBTL-433 | 19.6" x 15" x 23.6" | 4 cu. ft. | -20 to 180°C | Yes | up to 1.5°C/min. | | | HBTX-475 | 19.6" x 15" x 23.6" | 4 cu. ft. | -70 to 180°C | Yes | up to 2.75°C/min. | | | Click model number for details, including metric & english units. | HBTL-433 Specifications | Item | Value | | Specifications are for reference only. Please contact HONGZHAN for detailed information. | | Product Family | Criterion Temperature & Humidity Benchtop | | Interior Volume | 4 cu. ft.
110 Liters | | Interior Dimensions （W x D x H） | 19.6" x 15" x 23.6"
500 x 380 x 600 mm | | Exterior Dimensions （W x D x H） | 29" x 34" x 46"
740 x 850 x 1150 mm | | Temperature Range | -20 to 180°C
-4 to 354°F | | Humidity Range （see chart for detail） | 10% - 95% RH |  | Average Change Rate
（rates lower with 50Hz power） | 1.5°C/min heat & 1.2°C/min cool
（empty） | | Power | 115V, 16A max. | | Temperature Fluctuation （at control sensor） | ±0.5 | | Humidity Fluctuation （at control sensor） | ±5 | | “Price Rank” （Comparing to other models in this product category.
Lower Number = Lower Price） | #5 out of 19 | HBTX-475
Specifications | Item | Value | | Specifications are for reference only. Please contact HONGZHAN for detailed information. | | Product Family | Criterion Temperature & Humidity Benchtop | | Interior Volume | 4 cu. ft.
113 Liters | | Interior Dimensions （W x D x H） | 19.6" x 15" x 23.6"
500 x 380 x 600 mm | | Exterior Dimensions （W x D x H） | 29" x 34" x 46"
740 x 850 x 1150 mm | | Temperature Range | -70 to 180°C
-100 to 354°F | | Humidity Range （see chart for detail） | 10% - 95% RH |  | 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 | | Humidity Fluctuation （at control sensor） | ±5 | | “Price Rank” （Comparing to other models in this product category.
Lower Number = Lower Price） | #12 out of 19 ranked | |
