108
8020216/19YN/V3-0/2020-12| SICK
O P E R A T I N G I N S T R U C T I O N S | DUSTHUNTER SP100 Ex-3K
Subject to change without notice
12
MAINTENANCE
12.7
Maintenance activities for MCUDH Ex control unit
12.7.1
Replacing the button cell in the control unit
Replacement criterion: As required.
Ex-condition:
Replacement can be carried out in the Ex-area when the absence
of an explosive atmosphere has been verified with a gas warning
device.
Take suitable measures to prevent dust from entering the control
unit enclosure when the door is open.
Work steps:
1
Disconnect the entire device (control unit and sender/receiver unit) from the power
supply.
2
Make sure that the environment allows the door of the control unit to be opened and
open it after the waiting time has elapsed.
3
Remove the old button cell on the circuit board. Insert a new button cell with adapter
ring
into the holder. Observe the installation direction of the button cell. The circuit
board is marked accordingly at this point.
4
Close the control unit door again.
5
Put the complete device back into operation (switch on voltage and check measured and
status values, set date and time).
Fig. 61: Replacing the MCUDH Ex-3K button cell
WARNING:
Risk of explosion when using an unspecified button cell
There is a risk of explosion when a different type of button cell is used.
▸
Only use button cell type BR1632A with adapter ring (
MCUDH Ex-3K / MCU control unit”, page 133
Button cell of the
MCUDH Ex-3K control unit