ESPEC Quality is more than a word


Stability Test Chamber (CWH)

Overview of Equipment

Complies with ICH stability test guidelines

Simple temperature and humidity testing has long been performed to confirm the quality maintenance properties in R&D and quality control processes for medical supplies, pharmaceuticals, cosmetics, food, packaging material, and more. This system has numerous advantages including ease of operation over long periods of constant use and ease of maintenance.

Guarantees an accuracy of ±1°C/±5% RH
Using new technology, this system supports stability testing (acceleration test) (±1°C/±5% RH at 40°C/75% RH) of the notification of the Ministry of Health, Labour and Welfare.
  • Area temperature and humidity control (Japanese patent no.6258110)
Uses two refrigeration circuits to reduce the risk of failure
This equipment uses two refrigeration circuits to reduce the risk of failure and to maintain operation even if one of the circuits should happen to malfunction.

Please scroll horizontally to look at table below.

Model Temperature &
humidity range
Temperature and humidity
maximum and minimum range
Inside dimensions (mm)
CWH-20A +25 to +40°C /
60 to 75%rh
±1°C / ±5%rh W1850 × H2100 × D2080
CWH-30A W2750 × H2100 × D2080
CWH-40A W2750 × H2100 × D3000


Guarantee of ±1°C/±5% RH accuracy

The temperature and humidity difference in the test chamber is the temperature and humidity maximum and minimum range, and an accuracy of ±2°C/±5% RH is guaranteed for all models. In addition, it clears the severe storage conditions* of ±1°C/±5% RH.

* Storage conditions based on Notification No. 43 of Pharmaceutical Affairs Bureau, 1991 are 40°C ±1°C/75% RH ±5% RH

Area temperature and humidity control (Japanese patent no.6258110)
This equipment utilizes area temperature and humidity control. By controlling the temperature difference settings effected by test area size and ambient temperature, an accurate temperature and humidity distribution within the test area is achieved.
Uses two refrigeration circuits for a stable and reliable operation
This equipment uses two standalone refrigeration circuits to maintain operation even if one circuit should happen to malfunction. In addition, alternating refrigeration circuits can prolong their operation. This provides a secure system prepared for risk.
Two refrigeration circuits
Door lock
Enables security control to prevent the loss of the specimen.
Door lock
E-mail notification
In the event a chamber alarm occurs, the alarm details can be sent to an e-mail address accessible by computer or mobile device.

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