Humidity Controlled STA

Measures weight changes and endothermic or exothermic reactions

STA8122/HUM is an instrument where TG-DTA measurements can be performed in a water vapor atmosphere with a constant relative humidity. In STA8122/HUM, TG-DTA measurements are carried out under a constant water vapor partial pressure. This instrument can provide a complete understanding of the sample’s thermal behavior with regards to different water vapor partial pressure, effective for applications such as hydrolysis of polymers, thermal behavior of hydrates in pharmaceuticals, debinding of ceramics.

STA/HUM Overview

TG-DTA measurements held at a constant temperature while changing the relative humidity measures the absorption ratio with regards to relative humidity useful for the sample’s water absorption property evaluation.

The humidity generator (HUM-1) uses N₂ base gas to create a water vapor containing a humidity controlled gas to be introduced to the TG-DTA. 

Here, the TG-DTA is equipped with a specialized electric furnace that keeps the temperature constant through a circulator to prevent condensation even at high water vapor concentration atmosphere and can perform measurements at a maximum of 80℃ 90% RH atmosphere.

The humidity sensor equipped with a feedback control leads to a stable humidity for longer measurements. Since the relative humidity settings in TG-DTA is integrated in the temperature program, the user can change the relative humidity in each step of the temperature program.

STA/HUM Features

Humidity control
Accurate compensation on horizontal differential triple-coil balance
Compact furnace
Greatly speeds up heating and cooling
Dynamic TG measurement modes
Stepwise isothermal analysis (SIA) method
Constant rate control (CRC) method
Measuring temperature range
Ambient to 1400°C

STA/HUM Specifications

Technique Simultaneous thermal analysis with humidity control
Benefit TG provides information on the weight changes derived from reactions such as dehydration, evaporation, sublimation, desorption, decomposition, adsorption, oxidation, while DTA provides temperature information associated with endo- or exothermic reactions
Technology Horizontal differential thermogravimetric-differential thermal analyzer (TG-DTA)
Attributes Horizontal differential triple-coil balance system which is the mainstream mechanism because the thermal drift which apparent mass change with increasing temperature becomes negligibly small
Dimensions STA 350 (W) x 310 (H) x 669 (D) (mm)
HUM-1 290 (W) x 260 (H) x 350 (D) (mm)
Mass 31 kg (STA), 15 kg (HUM-1)
Power requirements STA 1Ø, AC100-120 V/200-240 V 50/60 Hz 15A
HUM-1 1Ø, AC100 V 50/60 Hz 5A

STA/HUM Application Notes

The following application notes are relevant to this product

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