VA 409

Flow Direction Relay — VA 409

Available on request
Delivery across Russia
Order phone: +7(800)777-18-50

Description

The VA 409 flow relay is used to determine the direction of compressed air and gas flow, especially in looped pipelines.

The VA 409 helps to easily and quickly determine the direction of compressed air flow. Unlike previously used mechanical vane flow relays, the VA 409 quickly detects even minor changes in gas flow direction without any mechanical movements.

Information about the flow direction is transmitted via a potential-free contact (normally closed, max. 60 VDC, 0.5 A) to the VA400/VA420 flow sensor or to an external dispatch system. The direction indication is provided by two LEDs.

When combined into a system with two VA400/VA420 sensors, the device allows for accurate measurement of incoming and outgoing air in looped pipelines.

Advantages

Detects the slightest changes <0.1 nm/s;
No moving parts;
Simple installation under pressure.

Technical Specifications VA 409
Direction detection range	< 0.1 m/s at 20°C and 1000 mbar
Measurement principle	Calorimetric
Sensing element	Pt 30/ Pt 700/ Pt 330
Measuring medium	air, other gases
Operating temperature	probe: 0...50°C housing: -20...70°C
Operating pressure	up to 16 bar
Power supply	24 VDC, 40 mA
Power consumption	max. 80 mA up to 24 VDC
Protection class	IP 54
EMC	according to DIN EN 61326
Electrical connection	2 x M12, 5-pin connectors A and B
2 potential-free contacts	2 x U max. 60 VDC, I max. 0.5 A (normally closed); on request: normally open
Housing material	Polycarbonate
Probe material	material: stainless steel 1.4301, dimensions: 160 mm, Ø 10 mm, sealing ring Ø11.5 mm, other lengths on request
Process connection	G 1/2“
Housing diameter	65 mm
Display	2 LEDs

Connector	Contact Number	Contact Color	Designation (Connector A)	Designation (Connector B)
	Contact 1	brown	GND -VB 0 V	NC
Contact 2	white	Contacts open when flow direction is left to right	Contacts open when flow direction is right to left
Contact 3	blue
Contact 4	black	NC	NC
Contact 5	gray	+24 VDC +VB	NC

Designation	Comment
GND, -VB	Power negative 0 V
+VB	Power positive 12...30 VDC
Contact 2 Contact 3	Normally open contact, opens ≤ 0.1 m/s, max. 60 VDC, 0.5 A
NC	Not connected

Specifications
Overall Drawing
Connection diagram
Applications

Technical Specifications VA 409
Direction detection range	< 0.1 m/s at 20°C and 1000 mbar
Measurement principle	Calorimetric
Sensing element	Pt 30/ Pt 700/ Pt 330
Measuring medium	air, other gases
Operating temperature	probe: 0...50°C housing: -20...70°C
Operating pressure	up to 16 bar
Power supply	24 VDC, 40 mA
Power consumption	max. 80 mA up to 24 VDC
Protection class	IP 54
EMC	according to DIN EN 61326
Electrical connection	2 x M12, 5-pin connectors A and B
2 potential-free contacts	2 x U max. 60 VDC, I max. 0.5 A (normally closed); on request: normally open
Housing material	Polycarbonate
Probe material	material: stainless steel 1.4301, dimensions: 160 mm, Ø 10 mm, sealing ring Ø11.5 mm, other lengths on request
Process connection	G 1/2“
Housing diameter	65 mm
Display	2 LEDs

Connector	Contact Number	Contact Color	Designation (Connector A)	Designation (Connector B)
	Contact 1	brown	GND -VB 0 V	NC
	Contact 2	white	Contacts open when flow direction is left to right	Contacts open when flow direction is right to left
	Contact 3	blue	Contacts open when flow direction is left to right	Contacts open when flow direction is right to left
	Contact 4	black	NC	NC
	Contact 5	gray	+24 VDC +VB	NC

Designation	Comment
GND, -VB	Power negative 0 V
+VB	Power positive 12...30 VDC
Contact 2 Contact 3	Normally open contact, opens ≤ 0.1 m/s, max. 60 VDC, 0.5 A
NC	Not connected