Hach DR 5000 - Manual (Page 26)

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Standard Operations
2. Select Long to change the number of audio signals.
Use the alphanumeric keypad to enter/specify the number of
audio signals (4–25).
Note: A high number of audio signals increases the duration of the
tones and a small number of audio signals reduces the duration of the
tones.
3. Press OK to confirm. The selected number of the audio signals
sounds as a corresponding acoustic signal.
4. Press OK to confirm. The instrument will return to
Instrument Setup.
5.2.5 Lamp Control
The tungsten lamp produces light in the visible spectrum 320 to
1100 nm.
The deuterium lamp (UV-lamp) available produces light in the
ultraviolet spectrum 190 to 360 nm.
In the overlap zone from 320 to 360 nm, either the deuterium lamp
(UV-lamp) or the tungsten lamp can be used for measurements.
The lifetime of the lamps is influenced
• by on-off operation and the length of time in use.
• Typical use is to turn the instrument on for the entire 8–10 hour
shift, and then off until the next day.
Note: In general, avoid on/off cycles of the lamp; this shortens the lamp’s
life span. For maximum life, turn the lamp off only if it will remain off for at
least 4–5 hours.
The lamp switches on automatically
• if a lamp is needed for the selected program
• if the instrument is operating inside the lamp’s spectrum
5.2.5.1 VIS-Lamp and UV-Lamp
1. Press Lamp Control in the Instrument Setup.
2. Select On to switch on the VIS-Lamp and/or UV-Lamp.
3. Select Save: in order to define a time interval for the burning
time of the VIS lamp and/or UV lamp.
4. Press the field below Save to select the lamp burning time.