BURKERT 20127653 Type 8697 pneumatic control unit is designed for the decentralised automation of ELEMENT Type 21xx and CLASSIC Type 20xx pneumatic process valves. This specific model features inductive proximity switches (PNP) to record the valve position and an integrated pilot valve to control single-acting actuators. The design of the control unit and the actuator permits an integrated pilot air duct without external piping. As well as the electrical position feedback, the device status is displayed by LEDs on the pneumatic control unit itself. The housing is easy to clean and features proven IP65/IP67 protection and chemically resistant materials for use in hygienic processing in the food, beverage, and pharmaceutical industries.

Combined with Bürkert ELEMENT actuators, the pneumatic actuating system enables spring chamber aeration that avoids actuator chamber contamination from the environment.

Key Features

• Compact design for seamless integration.
• Integrated pilot valve with manual override.
• Integrated pilot air duct in the actuator.
• Automatic end position feedback setting.
• Explosion protection: ATEX II cat. 3G/D and cat. 2G/D approval.

Technical Data

Property	Value
Body Material	PPS
Seal Material	EPDM
Cover Material	PC
Setting valve end position	Automatic (mechanical)
Manual override of pilot valve	Yes
Status display	Coloured LEDs
Operating voltage (Pilot valve)	24 V DC ± 10 %, residual ripple 10 % DC, power consumption 1 W
Position feedback	2x inductive proximity switch (24 V DC), PNP shutter (3-wire) with LEDs
Electrical connection	Cable gland M16 × 1.5 (cable ∅ 4...8 mm) with screw-type terminals
Control medium	Neutral gases, air, quality class according to ISO 8573-1
Supply pressure	3...7 bar
Air capacity	7 lN/min (for aeration and ventilation)
Circuit function	Single-acting
Degree of protection	IP65/IP67 according to EN 60529, 4X according to NEMA 250 standard

Note on Pressure

The supply pressure must be 0.5…1 bar above the minimum required pilot pressure of the valve actuator.

Approvals and Conformities

Explosion Protection (ATEX / IECEx)

• ATEX: BVS 13 ATEX E 087 X (II 3G Ex ec IIC T4 Gc / II 3D Ex tc IIIC T135 °C Dc)
• IECEx: IECEx BVS 13.0097 X (Ex tc IIIC T135 °C Dc / Ex ec IIC T4 Gc)

North America (USA/Canada)

• UL Listed: cULus certificate E238179
• FM (Factory Mutual): Increased Safety for Class I, Zone 2, AEx/Ex ec IIC T4 Gc; Zone 22, AEx/Ex tc IIIC T135 °C Dc hazardous locations.

Material Specifications

No.	Element	Material
1	Cover	PC
2	Seals	EPDM
3	Screws	Stainless steel
4	Push-in connector / Threaded connection G 1/8	POM/Stainless steel / Stainless steel
5	Basic housing	PPS
6	Cable gland	PA

Dimensions

Mounting on ELEMENT process valve Types 21xx

(Dimensions in mm, unless otherwise stated)

Electrical Connection

Cable Gland Variant (M16 × 1.5, screw terminal 1.5 mm²)

Terminal assignment with inductive proximity switch 3-wire 24 V DC PNP:

Terminal	Configuration	External circuit
1	INI + (24 V DC) Supply	+ 24 V DC
2	INI GND Supply	GND
3	INI Top OUT Output 1	Output 1
4	INI Bottom OUT Output 2	Output 2
5	Valve control 0/24 V DC	0/24 V DC ± 10 %
6	Valve control GND	Residual ripple 10 %

Electrical Safety

Risk of electric shock. Before reaching into the device, switch off the power supply and secure to prevent reactivation. Observe applicable accident prevention and safety regulations for electrical equipment.

Pneumatic Connection

Procedure:

1. Connect the control medium to the pilot air port (1) (3...7 bar, oil, water and dust-free instrument air).
2. Attach the exhaust airline or a silencer to the exhaust air port (3).

Exhaust Air Concept

In compliance with degree of protection IP67, an exhaust air line must be installed in the dry area. Keep the adjacent supply pressure always at least 0.5...1 bar above the pressure which is required to move the actuator to its end position.