Product specification
© Bruel & Kjær Vibro GmbH / 2 mm Series ds82x / BPS0138-EN-15 l 1 of 20
2 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)
• Enhanced tip design
• 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 18
2 mm Measuring Range
Non-Contacting Displacement Sensor System Series ds821 / Series ds822
l 2 of 20 © Bruel & Kjær Vibro GmbH / 2 mm Series ds82x / BPS0138-EN-15
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 sur-
face and sent via a proportional voltage signal to a subsequent monitoring system. In the application range of
machine monitoring, this makes it possible to record the status of rotating shafts.
The ECDS system (Eddy Current Displacement Sensor) consists of the components of displacement sensor with an
integrated cable, an optional separate extension cable and the driver (oscillator/demodulator).
The displacement sensor is available as a forward as well as a reverse-side mountable version.
The ECDS system (Eddy Current Displacement Sensor) 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 2 mm Series ds821 Standard: 2 mm Series ds822 ATEX:
Complete system (mc) ds821.mc10x ds822.mc10x
Displacement sensor (ds) ds821.ds10xx ds822.ds10xx
Connection cable (ec) ds821.ec10x ds822.ec10x
Driver (oscillator/demodulator) (od) ds821.od110 ds822.od110
Colour code Blue Red
Measuring range 2 mm 4 mm