Humidity Chambers

ICH Stability Chambers - Temperature and Humidity Controlled

SP Scientific Reach-in Temperature Humidity Controlled Stability Chambers are constructed entirely from Stainless Steel, inside and out. The Temperature Humidity models are fully ICH compatible and have a range of 2°C to 70°C + 2°C uniformity throughout the chamber and 20% to 96% RH + 5%.


Hotpack 33HR



  • Stainless Steel interior and exterior
  • Accurate temperature control
  • Microprocessor based PID controls
  • StabilityPLUS™ Airflow
  • Solid door as standard


Hotpack models 33HR and 33HA are high quality, high performance Temperature and Humidity Controlled Stability Chambers, built to exceed the exacting standards required by such regulatory bodies as ICH, TAPPI and MIL Spec.

The Temperature and Humidity controlled Stability Chambers are constructed from 304 Stainless Steel, with the exterior surface painted as extra protection. The interior is unpainted allowing easy cleaning and draining when used in high humidity conditions. Each unit is supplied with 4 solid stainless steel shelves which locate into 4 pilasters, and these serve to hold the shelves rigid and bear the load of the samples being tested. There are 19 available shelf positions to allow high density testing if required. The Hotpack 33HR Temperature and Humidity Controlled Chamber has refrigeration and an operating temperature range of 2°C to 70°C, while the Hotpack 33AR Temperature and Humidity Controlled Chambers no refrigeration and operates between 35°C and 70°C. A full performance envelope is shown below.

A microprocessor based PID controller allows extremely accurate temperature and humidity performance and ensures that the chamber performs well within the specified test limits. The controller also has user settable over- and under- temperature and humidity limits and audible/visual alarm systems which alert the user to events such as power interruptions or out-of-specification excursions.

The key to uniformity in any Temperature and Humidity Controlled Stability Chamber is the airflow, which ensures all parts of the chamber are constantly supplied with conditioned air at the correct temperature and humidity. The Stability PLUS™ design ensures there are no hot or cold spots anywhere in the chamber, which would destroy the critical balance of temperature and humidity. Also the gentle nature of the airflow ensures that all test areas are fully conditioned, regardless of chamber loading.

A wide range of optional accessories is available for the Temperature and Humidity Controlled Stability Chambers including access ports, PC interfaces, dehumidifiers and chart recorders.




Specifications: Hotpack 33HR & 33HA

  33HR 33HA
Chamber Volume 33 cu ft 
934 Liters
33 cu ft 
934 Liters
Chamber Dimensions 33”w x 27”d x 60”h 
84cm x 69cm x 152cm
33”w x 27”d x 60”h 
84cm x 69cm x 152cm
External Dimensions 41”w x 35”d x 90”h 
104cm x 89cm x 229cm
41”w x 35”d x 90”h 
104cm x 89cm x 229cm
Temperature range 2°C to 70°C 35°C to 70°C
Control Resolution 0.1°C 0.1°C
Humidity range 20% - 96% RH 20% - 96% RH
Control Resolution 0.1°C 0.1°C
Uniformity at 37°C + 1°C + 1°C
Heat-up time: Amb - 37°C 7 minutes 7 minutes
Heat-up time: 10°C - 50°C 22 minutes -
Recovery time at 37°C** 1.25 minutes 1.25 minutes
No. of shelves supplied 4 4
Max no. of shelves 19 19
Shelf area (each) 6 sq ft (0.5 sq M) 6 sq ft (0.5 sq M)
Electrical Services 220V, 1Ph, 50/60Hz 
2.0kW, 16A
220V, 1Ph, 50/60Hz 
2.0kW, 16A
Shipping Weight 1,600 lbs; 727 Kg 1,200 lbs; 545 Kg

Typical Performance Envelope for a Temperature and Humidity Controlled reach-in Chamber:


 Hotpack 33HR    Hotpack 33HA

ControLyo® Technology

Control Nucleation - On Demand

Featured Product

LyoCapsule 7-Vial Freeze Dryer

LyoModelling Calculator

LMC Icon

New LyoTool to 

model a freeze-drying cycle 

Request a Quote

Interested in learning more about our products?

Our Lyo Tools

LyoTools Circles


Our Lyo Tools include the Dictionary, the Conversion Calculator and the Vapor Pressure Chart.

"The technical information on your website, and the free lyo seminars you offer are a testament to your expertise.  The resources are truly invaluable and appreciated."

Actual Client Testimonial


About Our Trusted Brands