Hach DR 5000 - Manual (Page 122)

122
Maintenance
7.2 Lamp replacement
CAUTION
The UV lamp generates UV light. Do not look directly at an
operating lamp without wearing UV protective eye glasses.
The Lamp compartment is on the left side behind the display and is
provided with ventilation on the back side. The tungsten and
deuterium (UV) lamp are installed in the lamp compartment. On the
back side a fan is installed for cooling of electric components.
The ventilation system operates automatically.
Refer to section 7.2.1 on page 122 , section 7.2.2 on page 123 and
Figure 8 on page 124 for instructions on replacing the tungsten
lamp and deuterium lamp (UV).
7.2.1 Tungsten lamp 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. Push the spring ( Figure 8 on page 124 , item 2 ) up and remove
the tungsten lamp ( Figure 8 , item 1 ) from the lamp
compartment.
6. Unplug plug contact ( Figure 8 , item 7 ) from the tungsten lamp.
Important Note: The lamp should only be held by the lamp socket.
Avoid touching the glass.
7. Push plug contact firmly onto the new tungsten lamp.
8. Insert the tungsten lamp into the lamp compartment. Push the
spring down.
9. Check that the spring and the lamp socket are positioned
correctly.
10. Use a screwdriver to screw the back cover onto the instrument
again.
11. Plug in power supply again.