Product specification
© Brüel & Kjær Vibro GmbH / 4 mm ds82x.mc301/ 5.2017 / BPS0135-EN-19 l 1
4 mm Measuring Range
Non-Contacting Displacement Sensor System Series ds821 / Series ds822
Features
Use
• Non-contacting displacement measurement based
on the eddy-current principle
• System length: 5 m or 10 m
• Series ds822 with ATEX approval
• Temperature range displacement sensor:
-55 °C … +180 °C
• Frequency: DC … 10 kHz
• Compact design of the driver housing
(oscillator / demodulator)
• One driver for both system lengths:
system length detected automatically by the driver
• Reduction of spare parts storage
• Easy assembly due to
- self-latching push-pull plug connections
- one mounting adapter for hat-rail or
drill-hole mounting
• Excellent precision and temperature stability
• When ordering a complete displacement sensor
system, the delivery comes with an acceptance test
certificate, including measurement report (factory
calibration).
Relative shaft vibration Eccentricity
Axial shaft position
Speed
Radial shaft position Reciprocating piston drop
Contents Page
Features 1
Use 1
Product description 2
Technical data 4
Versions and order codes 7
Approvals 17
4 mm Measuring range
Non-Contacting Displacement Sensor System Series ds821 / Series ds822
l 2 © Brüel & Kjær Vibro GmbH / 4 mm ds82x.mc301/ 5.2017 / BPS0135-EN-19
EN
Product description
The displacement sensor systems of the ds820 family are based on the non-contacting eddy-current measurement process.
The distance is measured between the tip of the displacement sensor and an electrically conductive surface and as a proportional
voltage signal send to an electronic monitoring system. In the application range of the machine monitoring, this makes it possible
to record the status of rotating shafts.
The eddy-current displacement sensor system consists of the component´s displacement sensor with an integrated cable,
an optional separate connection cable, and the driver electronics (oscillator/demodulator).
The displacement sensor is available as a forward as well as a reverse-side mountable version.
The eddy-current displacement sensor system is available as series ds821 Standard and ds822 ATEX. Each series is available in
system lengths of 5 m and 10 m.
The name of a component is a combination of the series´ name (ds821 or ds822 ATEX) and the component designation
(mc = complete system, ds = displacement sensor, ec = connection cable or od = driver).
Colour coding
The non-contacting displacement sensor systems series ds821 and ds822 are available with various measuring ran-
ges. Each measuring range is identified by a coloured mark at the end of the integrated cable of the displacement
sensor, at the ends of the extension cable and on the driver unit. This makes it easy to identify associated compo-
nents during installation. The colour codes according to measuring range are as follows:
Displacement sensor system 4 mm Series ds821 Standard: 4 mm Series ds822 ATEX:
Complete system (mc) ds821.mc301 ds822.mc301
Displacement sensor (ds) ds821.ds300S ds822.ds300S
Connection cable (ec) ds821.ec30E ds822.ec30E
Driver (oscillator/demodulator) (od) ds821.od130 ds822.od130
Colour code Blue Red
Measuring range 2 mm 4 mm