Hach-Lange DR 5000 User Manual - Manual (Page 127)

127
Maintenance
12. Switch the instrument on.
13. Reset the Lamp History, see section 6.8.5 on page 119 .
7.2.2 Deuterium lamp (UV) replacement
1. Switch the instrument off.
2. Unplug the power cord.
DANGER
The instrument must remain switched off until the change of
lamp has been completed.
WARNING
Burn Hazard. Wait until the lamp cools down. Contact with the
hot lamp can cause burns.
3. Use a screwdriver to remove the cover from the back of the
instrument (the screws may be slotted or cross-headed).
4. Place the cover and the attached fan carefully beside the
instrument (take special care with the fan cable).
5. Unplug the deuterium lamp ( Figure 8 on page 128 , item 4 ) from
the socket by pushing down on the safety contact.
6. Use a screwdriver to unscrew the two fastening screws
( Figure 8 , item 3 ) (the screws may be slotted or cross-headed)
out of the socket.
7. Holding the lamp socket, lift the deuterium lamp up out of the
lamp compartment (remove the complete unit, including the
cable).
8. Carefully insert the new deuterium lamp into the lamp
compartment.
Important Note: Do not touch the glass envelope on the new lamp.
If it is touched, clean with alcohol.
9. Screw in both fastening screws again until they are finger-tight.
10. Insert the deuterium lamp in the socket so that the safety
contact clicks into place.
11. Use a screwdriver to screw the back cover onto the instrument
again.
12. Plug in power supply again.
13. Switch the instrument on.
14. Reset the Lamp History, see section 6.8.5 on page 119 .