OpenHumidistat: Humidity-controlled experiments for everyone

HardwareX

Sissi de Beer¹  Lars B. Veldscholte² 

[1] Materials MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands;;Sustainable Polymer Chemistry Group, Department of Molecules &

关键词: Humidity;    Controller;    Electronics;    Pneumatics;    PID;   

DOI  :  

来源: DOAJ

【 摘 要 】

Humidity control is a crucial element for a wide variety of experiments. Yet, often naive methods are used that do not yield stable regulation of the humidity, are slow, or are inflexible. PID-based electropneumatic humidistats solve these problems, but commercial devices are not widespread, typically proprietary and/or prohibitively expensive. Here we describe OpenHumidistat: a free and open-source humidistat for laboratory-scale humidity control that is affordable (€500) and easy to build. The design is based around mixing a humid and dry air flow in varying proportions, using proportional solenoid valves and flow sensors to control flow rates. The mixed flow is led into a measurement chamber, which contains a humidity sensor to provide feedback to the controller, to achieve closed-loop humidity control.

【 授权许可】

Unknown