Criterion Temperature & Humidity Benchtop Chambers

Our largest benchtop humidity chamber


4 cu. ft. Temperature/Humidity chamber

BTL-433 with optional window


Adding to our popular Criterion benchtop series, ESPEC introduces the BTL-433 humidity chamber with the same quality features and expanded capabilities. 

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 extended temperature and humidity ranges make testing at more extreme conditions possible.

The vertical configuration saves bench space, plus the refrigeration’s ventilation design allows installation against a wall for even more space savings.

BTL Interior

ESPEC Expertise in Humidity Control

Controlling humidity in a small environmental chamber can be especially challenging. ESPEC expertise in humidity control brings intelligent design that is carefully integrated into the BTL-433. 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.

  Compare Benchtop Models Side-by-side comparison of up to three models.

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 with detachable eight-foot power cord
  • 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, auto-start, and end
  • RS-232C Modbus interface (free standard software)

Criterion Temperature & Humidity Benchtop Model Comparison

Clear Filters

Model / Link Interior Dimensions
(W x D x H)
Interior Volume Temperature Range Humidity Control Notes
BTL-433 19.6" x 15" x 23.6" 4 cu. ft. -20 to 180°C Yes
Click model number for details, including metric & english units.

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