VACUUBRAND DVR 4S - Manual (Page 16)

page 16 of 20
Documents are only to be used and distributed completely and unchanged. It is strictly the users´ responsibility to check
carefully the validity of this document with respect to his product. manual-no.: 99 90 72 / 13/08/2005
Technical data of the power supply unit:
Approval: II 2 G EEx ia IIC T5
Type: BVE 9V
PTB 98 ATEX 2206
U
N
= 9 V
I
N
= 23 mA
U
0
= 11.1 V
I
0
= 28.8 mA
P
0
= 79.8 mW
C
0
= 1.9 µF
L
0
= 25 mH
The user can replace the sealed power supply unit of vacuum gauges DVR 3 / DVR 4 / DVR 4S within the
hazardous area of category 2 (according to the approvals of power supply unit and vacuum gauge).
Warning: The power supply unit of the DVR 4S must only be replaced in hazardous areas with the current
loop disconnected.
Note: Some of the components on the printed circuit board are sensitive to electrostatic discharge.
Do not touch components. Ground printed circuit board and person replacing power supply unit suitably.
Attention: Use only genuine power supply unit BVE 9V. When using other power supply units the approval
for use in explosive atmosphere is void!
The power supply unit must not be charged or connected to an external voltage.
Replacement of power supply unit
➨ Remove the power supply unit from the hous-
ing rear part.
➨ Remove the two contact springs and insert the
springs into the new power supply unit.
➨ Insert the new power supply unit in the hous-
ing rear part.
☞ When reassembling the vacuum gauge, make
sure that the switch pad, the printed circuit
board and the form seal (only DVR 4 / DVR 4S)
are positioned correctly.
➨ Carefully screw both parts of the housing to-
gether.
☞ Only DVR 4S: Disconnect the current loop.
➨ Unscrew the four countersunk head screws at
the rear side of the housing by using a Phillips
screw driver.
➨ Open the housing carefully.
power supply
unit
contact spring
switch pad
printed circuit board
form seal (only DVR 4 / DVR 4S)