BURKERT 20032688 (Type 8652 AirLINE) is an 8-slot modular pneumatic valve island configured for process automation in control cabinets. Fitted with an AirLINE Quick anodised aluminium base plate, this unit provides 8 valve slots equipped with dual 3/2-way normally closed solenoid valves (Circuit Function C), yielding 16 independently controlled pneumatic valve functions. Process connections feature push-in D10 mm brass supply ports (port 1) and push-in D6 mm brass working ports (ports 2 and 4). Integrated check valves in exhaust ducts 3 (R) and 5 (S) prevent unintentional actuator movement caused by backpressure spikes, while integrated pneumatic HotSwap functionality at port 1 (P) enables individual valve replacement during ongoing plant operation without pressure interruption.

Communication is handled by an integrated PROFIBUS DPV1 interface module via a 9-pin Sub-D connector. Diagnostic parameters and valve switching states are visualised directly on the built-in LC display in clear text and standardized symbols, and transmitted cyclically to the higher-level PLC. The valve island is rated for continuous operation (100% duty cycle) across an operating pressure range of vacuum to 10 bar (-1.00 bar to 10.00 bar), with an auxiliary pilot air supply requirement of 3 bar to 10 bar.

Technical Specifications

Parameter	Specification
Type	8652 AirLINE
Article number (Ident number)	20032688
Number of valve slots	8 slots (11 mm station width each)
Installed valve functions	16 (8 slots × dual 3/2-way CF-C)
Body material	Polyamide (PA)
Seal materials	NBR and PUR
AirLINE Quick adapter plate	Anodised aluminium
Supply connection (port 1)	Push-in fitting D10 mm, nickel-plated brass
Working ports (ports 2 and 4)	Push-in fitting D6 mm, nickel-plated brass
Auxiliary pilot air	Internal supply
Intermediate feed modules	0 (none required for 8-slot configuration)
Operating pressure range	Vacuum to 10 bar (-1.00 bar to 10.00 bar)
Auxiliary pilot pressure range	3 bar to 10 bar
Nominal flow rate QNn (air)	310 l/min (measured at +20 °C, 6 bar inlet, 1 bar Δp; approx. 3% flow reduction with HotSwap)
Operating medium	Compressed dry air (lubricated or oil-free), neutral gases
Compressed air quality	ISO 8573-1:2010, Class 7.4.4 (5 µm filtration recommended)
Operating voltage	24 V DC (±10%, residual ripple 1 Vss)
Power per valve coil	0.7 W nominal (0.175 W after electronic power reduction)
Current per valve coil	29 mA nominal (10 mA after electronic power reduction)
Digital inputs	0 (without DI electronic module)
Degree of protection	IP20 (bare) / IP65 (installed with AirLINE Quick in closed control cabinet)
Ambient operating temperature	-10 °C to +55 °C
Fluid / medium temperature	-10 °C to +55 °C
Storage temperature	-20 °C to +60 °C
Duty cycle	Continuous operation (100% ED)
Protection class	III according to DIN EN 61140, VDE 0140

AirLINE Quick Adapter Plate

AirLINE Quick allows direct mechanical and pneumatic installation onto the control cabinet floor or wall, eliminating bulkhead feedthrough fittings. All pneumatic connections for supply air, exhaust air, and working lines pass through the cabinet base plate.

• Floor and wall cut-out mounting eliminates individual hose pass-throughs
• Anodised aluminium adapter plate construction
• Nickel-plated brass push-in fittings: D10 mm for supply/exhaust, D6 mm for working lines 2 and 4
• Ingress protection reaches IP65 when mounted in a suitable closed control cabinet

Valve Configuration and Circuit Functions

Article 20032688 is configured with 8 valve slots, each populated with a Type 6534 dual 3/2-way servo-controlled solenoid valve in Circuit Function C (normally closed). Each valve module operates with latching manual override (spring return) and 11 mm width per station.

Position	Circuit Function	Description	QNn (Air)	Switching Time Opening	Switching Time Closing
Slot 1 to 8	2 × 3/2-way CF-C	Dual 3/2-way solenoid valve, servo-controlled, normally closed, with manual override	270 l/min	15 ms	15 ms

Integrated exhaust check valves in ports 3 and 5 prevent back-venting into unpressurised actuator chambers when adjacent valves discharge. The integrated pneumatic HotSwap function at port 1 incorporates a shut-off mechanism that permits individual valve removal under working pressure while the remaining 7 valve stations continue running.

Dimensions and Mounting

Dimensions for 4-, 8-, and 12-slot configurations according to Type 8652 technical documentation (all dimensions in mm):

Configuration	A (mm)	B (mm)	C	m	n
4-slot	66	—	4 × M5	3	1
8-slot (20032688)	35	111	8 × M5	7	2
12-slot	77	154	10 × M5	11	3

The assembly can alternatively be mounted on standard DIN rails (EN 50022, 35 × 7.5 mm or 35 × 15 mm). When installing inside a control cabinet, clearance to the front edge and rear wall must be maintained.

Control Cabinet Clearance for Hot Swap

To enable unimpeded replacement of valve modules under HotSwap operation, observe the minimum clearance to the front edge of the control cabinet specified in the Type 8652 operating manual. Ensure adequate spacing between the cabinet rear wall and the mounting plate for cable routing and air line radius.

Electrical and Fieldbus Connections

The valve island utilizes separate power supplies for the electronic communication/display circuits and the pneumatic valve coils to permit emergency shutdown of valve outputs without disrupting fieldbus communication.

Electronics and Display Power Supply (5-Pin Spring Terminal)

Pin	Colour	Assignment
1	Red	24 V DC
2	White	CAN_H (büS connection)
3	Green	Shielding
4	Blue	CAN_L (büS connection)
5	Black	GND (0 V DC)

Permissible conductor cross-section is ≤ 1.5 mm².

Pneumatic Valve Power Supply (2-Pin Spring Terminal)

Clip	Colour	Assignment
1	Red	AUX 24 V DC
2	Black	GND (0 V DC)

PROFIBUS DPV1 Fieldbus Interface (Sub-D 9-Pin)

Pin	Signal	Description
1	Shielding	Cable shield / ground
2	M24	24 V ground return (optional)
3	RxD/TxD-P	Receive / Transmit data positive (B-line)
4	CNTR-P	Control signal P (repeater direction control, optional)
5	DGND	Data ground (0 V)
6	+5 V	+5 V DC termination power supply
7	+24 V	24 V DC power supply (optional)
8	RxD/TxD-N	Receive / Transmit data negative (A-line)
9	CNTR-N	Control signal N (optional)

Diagnostic Display and Monitoring

The built-in LC display shows diagnostic notifications in plain text and symbols. Operating status, error codes, and channel states can be evaluated at the cabinet floor without external configuration tools, while cyclical diagnostics are reported via PROFIBUS DPV1 to the process controller.

Explosion Protection and Hazardous Area Guidelines

Article 20032688 complies with explosion protection standards for equipment category 3 in Zone 2 (gas) and Zone 22 (dust):

Standard / Authority	Marking	Certificate Number
ATEX	II 3G Ex ec IIC Gc II 3D Ex tc IIIC Dc	BVS 20 ATEX E 031 U
IECEx	Ex ec IIC Gc Ex tc IIIC Dc	IECEx BVS 20.0024 U
CCC	Certified for hazardous areas in China	GB/T 3836 series
cURus HazLoc	Class I, Zone 2, AEx ec IIC Gc / Ex ec IIC Gc U Class II, Zone 22, AEx tc IIIC Dc / Ex tc IIIC Dc U Class I, Division 2, Groups A, B, C, D Class II, III, Division 2, Groups F, G	E-file certification

Hazardous Area Operating Restrictions

• In potentially explosive atmospheres, the 24 V DC power supply, SIA connections, and digital input terminals must only be connected or disconnected when completely de-energised.
• The pneumatic HotSwap function must not be used while a potentially explosive atmosphere is present. Valve replacement under pressure is permitted only when test equipment verifies that no hazardous atmosphere exists.
• For type of protection "ec", install inside an enclosure meeting EN/IEC 60079-0 and EN/IEC 60079-7 with minimum IP54 ingress protection.
• For type of protection "tc", install inside an enclosure meeting EN/IEC 60079-0 and EN/IEC 60079-31 with minimum IP6X ingress protection.
• Transient protection must limit voltage surges to a maximum of 140% of the nominal peak supply voltage.

Replacement Valves and Accessories

Individual valve slices on the 8652 island are replaceable as spare parts. For article 20032688, replacement valves correspond to Type 6534:

Circuit Function	Orifice	QNn (Air)	Pressure Range	Voltage	Replacement Valve Part No.	Spare Part Set Part No.
2 × 3/2-way CF-C (installed)	4 mm	270 l/min	Vac. to 10 bar	24 V DC	301374	296031
2 × 3/2-way CF-D	4 mm	310 l/min	Vac. to 10 bar	24 V DC	301375	296032
5/2-way CF-H	4 mm	290 l/min	Vac. to 10 bar	24 V DC	301376	296033
5/2-way impulse CF-Z	4 mm	290 l/min	Vac. to 10 bar	24 V DC	301377	296034
5/3-way CF-L (closed mid)	4 mm	275 l/min	Vac. to 10 bar	24 V DC	301380	296036
5/3-way CF-M (pressurised mid)	4 mm	300 l/min	Vac. to 10 bar	24 V DC	301379	296035
5/3-way CF-N (exhausted mid)	4 mm	300 l/min	Vac. to 10 bar	24 V DC	301381	296039
Dummy valve plate	—	—	—	—	335779	327614

AirLINE Quick Fastening and Height Adapters

Description	Quantity	Article Number
Screw set M5 × 10 A2 DIN 6912 (base fastening)	10 pcs	308661
Height adapter for 8-fold base (without intermediate feed)	1 pc	754960
Retaining plate for 8-fold base (cabinet exterior)	1 pc	60005566
Blind plate for 8-fold base	1 pc	754965
5-pin spring-loaded terminal (electronics/display)	1 pc	920180
2-pin spring-loaded terminal (valve supply AUX 24 V)	1 pc	920442