The Burkert Type 8694 is a compact digital electropneumatic positioner designed for integrated mounting on pneumatically controlled process control valves. The set-point value setting default occurs via a standard 4-20 mA signal and/or via AS-Interface, IO-Link, or Bürkert system bus (büS). A contactless sensor element records the valve spindle position, ensuring wear-free operation. Simple start-up is facilitated by the automatic X.TUNE function and DIP switch settings.

Key Features

• Compact and robust stainless steel design
• Start-up with automatic TUNE function
• Contact-free position sensor
• Integrated pilot air duct in the actuator
• AS-Interface, IO-Link, or Bürkert system bus (büS) communication

General Technical Data

Product Properties	Description
Body Material	PPS, stainless steel
Seal Material	EPDM
Cover Material	PC
Operation	2 operating keys, integrated DIP switch
Configuration Tool	Bürkert Communicator
Commissioning	Automatically by X.TUNE function (automatic adjustment of positioner)
Status Display	Multicoloured LEDs for device and valve status
Communication	AS-Interface, IO-Link, Bürkert system bus (büS) (based on CANopen)

Performance Data	Description
Measurement Principle	Linear: inductive / Rotary: magnetic
Stroke Range	Linear: 3...45 mm / Rotary: 30...180°
Operating Voltage	24 V DC ± 25% (UL: NEC Class 2)
Power Consumption	≤ 3.5 W
Control Medium	Neutral gases, air (quality class according to ISO 8573-1)
Supply Pressure	Low air capacity: 0...7 bar / High air capacity: 3...7 bar
Pilot Air Port	Threaded connection G 1/8, stainless steel
Ambient Temperature	-10...+60 °C
Degree of Protection	IP65/IP67 according to EN 60529, 4X according to NEMA 250 Standard

Materials

No.	Element	Material
1	Cover	PC
2	Seal	EPDM
3	Body casing	Stainless steel
4	Seal	EPDM
5	Screws	Stainless steel
6	Push-in connector / Threaded port G 1/8	POM/stainless steel / Stainless steel
7	Basic housing	PPS
8	M12 plug connector	Stainless steel
9	Screws	Stainless steel

Dimensions

Mounting on ELEMENT control valve Type 23xx / 2103

INFO

Dimensions in mm, unless otherwise stated.

Signal Flow Diagram

Position control loop

Additional software options of the TopControl BASIC positioner Type 8694 (extract):

• X.Tune function for automatic start-up
• Linear characteristic
• Close-tight function
• Reversal of the operating direction of the set-point signal
• Switching between manual and automatic mode
• Digital input
• Device operation via service büS interface and communicator
• Position controller parametrisation
• Programmable stroke range limit
• Limitation of opening/closing time
• Safety position definition
• Signal error detection

Approvals and Conformities

• Explosion Protection: ATEX (II 3D Ex tc IIIC T135 °C Dc / II 3G Ex ec IIC T4 Gc), IECEx (Ex tc IIIC T135 °C Dc / Ex ec IIC T4 Gc)
• North America: cULus Listed (E238179), FM Explosion Protection (Class I, Zone 2, AEx ec IIC T4 Gc)
• Others: China Compulsory Certification (CCC) for hazardous applications in China.