Type 8691

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1.

General technical data

1.1. Control head Type 8691

Product properties

Dimensions

Further information can be found in chapter “4. Dimensions” on page 8.

Material

Body

PPS, stainless steel

Seal

EPDM

Cover

PC

Operation

Operating keys

2

Service interface

Connected to PC via USB connection

Configuration tool

Bürkert Communicator

Commissioning

Setting valve end position

Through automatic or manual teach function

Manual operation of pilot valve

Yes

Status display

Display of device and valve status

High-power LEDs (colours individually adjustable)

Communication

Fieldbus

AS-Interface, IO-Link

Digital

Bürkert system bus (büS) (based on CANopen)

Performance data

Functional overview

Further information can be found in chapter “1.6. Functional overview Type 8691" on page 6.

Position sensor

Analogue position sensor

Inductive (contactless) with self-adjusting switching points (PNP) (NPN on request)

Stroke range for linear actuator

Valve spindle

2.5…45 mm

Electrical data

Electrical connection

Multipole version

M12, 8-pin resp. 4- or 5-pin according to device version

(see “5. Device/Process connections” on page 9)

Cable gland version

M16 × 1.5 (terminal range 5…10 mm)

With screw terminals for cable cross sections 0.14…1.5 mm²

Pneumatic data

Control medium

Neutral gases, air, quality class according to ISO 8573 - 1

Dust content

Class 7 (< 40 µm particle size)

Particle density

Class 5 (< 10 mg/m3)

Pressure dew point

Class 3 (<- 20 °C)

Oil content

Class X (< 25 mg/m3)

Air supply filter

Exchangeable

Mesh size

~0.1 mm

Supply pressure

3…7 bar 1.)

Pilot air port

Threaded connection G ⅛, stainless steel

Positioning system

Circuit function

Single and double-acting

Air capacity

250 l

N/min (for aeration and ventilation)

(Q

Nn value according to definition at pressure drop from 7 to 6 bar abs)

Actuator series/size

Type 21xx, actuator Ø 70/90/130/225 mm