Brüel & Kjaer Vibro ds822 Serie Manuel page 48

4 mm displacement sensor system series ds822 ATEX
EN
Instructions
4 Installation
Read the safety information in the chapter "Safety" before installation. To assemble the displace-
ment sensor system, proceed in the following order:
4.1 Sensor assembly
4.2 Driver assembly
4.3 Connect the components together
4.4 Start up the displacement sensor system
4.5 Electrical connection
Requirements:
The displacement sensor system is complete (see "Components included in scope of sup-

ply:"on page 10).
The overall length of the measuring system neither exceeds nor falls below the nominal

length.
The required clearances and the width of the measuring track are considered (9.3.2 Prop-

erties of the measuring track and 9.3.3 Required clearances and minimum distances for
displacement sensors).
The sensitivity of the target material is known.

Operation as category 1/2 device
C
If the measuring chain is operated as a category 1/2 device (sensor in zone 0
and driver in zone 1), the conduits between zone 0 and zone 1 (gas-tight
partition!) must be gas-tight and comply with protection class IP 67 (EN 60529).
If an isolating transformer is used the communication link connected to the housing of the driver,
is grounded with a resistance of 10
When used as an IIC equipment the driver must be installed in an ATEX-protective housing
and must be cleaned with a damp cloth only, to avoid static charges on the type plate.
C
To prevent static charging, all sensor cables within zone 0 must be fitted with a
steel protective conduit or steel tube securely connected to the local potential
equalisation (contact resistance ≤ 1 MΩ). If electrostatic charging is possible on
a driver and the measuring chain is conducted on an isolating transformer at
once, the driver has to be protected with an additional housing or has to be
grounded with a resistor  10
The steel protective conduit or steel tube must be galvanically connected to the sensor

housing.
Page 12 of 35
!
AUTION
9
Ω.
!
AUTION
9
Ω.
| Installation
© Brüel & Kjær Vibro C105070.001 / V04

Technical alterations reserved!