Some systems also have additional fan speed controllers if the fans are mains powered. The control system also displays parameters such as air change rate and pressure, and incorporates an alarm system. Any other electrical devices such as interlock electromagnets or lights are also controlled by this system.
Some control panels are integrated into the isolator whereas it is common with flexible film types to have a separate control box located at the front under the work surface. Fans may be 24 VDC, PWM or analogue (0-10 VDC) controlled, or 230 VAC.
The control panel is connected to the main circuit board which sends speed control signals to the fans and houses the sensors to drive the digital displays.
Firstly, they are low voltage and inherently safe, but can control almost any type of fan including 24 VDC , PWM or analogue (0-10 VDC) controlled, or 230 VAC. Secondly they can control the isolator pressure and ACR fully automatically, so no setting up is required. Thirdly, the systems can carry out a fully automatic pressure holding test and be linked to VHP (vaporised hydrogen peroxide) decontamination generators (such as Bioquell Clarus and Steris).
All our circuit boards are also fitted with an RS232 socket which can be used for wireless data logging etc.