Espec – Criterion Benchtop Chambers

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. Some models use 115V power, meaning no special power hook-ups. 

• Lowest temperature: -20 or -70°C (-4 or -94°F) 

• Highest temperature: 180°C (354°F) 

• Humidity range: 10 to 95% RH 

• Chamber size: 1.5 or 4 cubic feet 

• Touch-screen Watlow F4T programmer with Ethernet access 

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. 

ESPEC can add safety options for testing lithium-ion batteries or other products. See the options tab for a list or the Battery brochure below. 

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 Criterion chambers. The humidity subsystems are designed for reliability, convenience, and performance: 

• The steam generator allows expanded humidity 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. 

Key Features

• High performance and quiet operation (65 dBa) 

• Space-saving footprint, designed for flush installation to wall 

• Stainless steel exterior 

• Full thermal break around doorframe 

• One 50mm (2”) diameter cable port on left, with flexible silicone plug 

• Three levels of overheat protection, plus overcool protection 

• Easy lift-off service panels, electrical access on left 

• Detachable eight-foot power cord with plug 

• Humidity models include direct water supply connection for continuous operation (supply tank optional) 

• ETL listed electrical panel conforming to UL 508A 

Touch-screen programmer/controller with Ethernet 

• Watlow F4T with touch-screen and Ethernet port standard 

• Save 40 profiles with up to 50 steps each (ramp, soak, jump, auto-start, end) 

• One event relay for external device control, plus specimen power interlock relay for safety 

• ESPEC exclusive options include: Web Controller for full remote access; Chamber Connect software for basic data logging and monitoring. USB and RS-485 ports available, as well. 

Technical Specifications

Model	BTZ-133	BTZ-175	BTZ-175E	BTU-133	BTL-433	BTX-475	BTZ-475	BTU-433
Temperature range	-70 to 180°C			-20 to 180°C		-70 to 180°C		-20 to 180°C
Change rate (per IEC 60068 3-5)	3.5°C/m heat-up 3°C/m cool down	5°C/m heat-up 5°C/m cool-down		2°C/m heat-up 1.6°C/m cool-down	1.5°C/m heat-up 1.2°C/m cool-down	2.75°C/m heat-up 2.5°C/m cool-down		1.5°C/m heat-up 1.2°C/m cool-down
Temperature fluctuation	±0.5°C per IEC 60068 3-5
Temperature gradient	±1.5°C (up to 100°C) per IEC 60068 3-6

AccuEyeBoardInOut