VA 409 – Direction switch for compressed air and gas systems
The VA 409 thermal direction switch with direction indicator is used to detect the flow direction of compressed air and gases, particularly in ring mains.
The VA 409 with direction indicator detects the flow direction of compressed air quickly and reliably. Compared with previous mechanical paddle switches, the VA 409 quickly detects even the slightest changes in the flow direction without any mechanical movement.
The direction information, in the form of a potential-free contact (normally closed, max. 60 VDC, 0.5 A), is transmitted to the VA 500 / VA 520 consumption sensors or to a separate building management system (BMS). Two light-emitting diodes indicate the flow direction.
When used in conjunction with two VA 500 / VA 520 consumption sensors, incoming and outgoing compressed air in ring mains can be measured with precision.
