ALV08/12/16: Valve Cluster for Multi-Chamber Measurements

The Aero-Laser instruments AL4021 and AL2021 can be connected by a valve cluster to several gas sources, like test chambers, gas sample flasks or the Micro-Chamber µCTE. There are three versions available with 8, 12 or 16 input ports. This allows automated measurements according to industrial standards, e.g. for formaldehyde: EN 717-1 or ASTM 6007. Each chamber is connected to the rear panel of the valve cluster by a PFA line. If measurements at elevated temperatures are planned, heated hose coupling should be used to prevent condensation of moisture inside the lines.

Front view of an ALV12 valve cluster. It is available with 8, 12 or 16 separate input channels. The currently open valve is displayed on the front panel.

The valves opening times are programmed either by an extension to our data logger software SqeezeDat or using the AutoSequence editor on the front panel of the gas analyzer. Both programs run a programmable valve sequence and store a unique valve-ID together with the acquired data. The order of valves and the individual opening times can be set freely according to the needs of the user.

Typical sequence for a setup of 8 test chambers with 1 hour sampling time per chamber.
Setup with an ALV08 valve cluster and a microchamber µ-CTE. The microchamber is connected to the AL4021 via the ALV08 and a T-piece with zero trap (not visible) to adapt the gas flow of the µ-CTE (max. 150mL/min) to the AL4021 (1L/min).