Hach-Lange 2100 N IS Laboratory Turbidimeter Basic User Manual - Manual (Page 8)

Figure 5 Indicator lights
1 NTU light 6 CAL? light
2 FNU light 7 UNITS AVG light
3 Lamp light 8 SETUP light
4 Manual Range light 9 S0–S3 lights
5 Auto Range light
Table 2 Light descriptions
Light Description
NTU Illuminated when the instrument is set for NTU unit of measure.
FNU Illuminated when the instrument is set for FNU unit of measure.
Illuminated when the instrument light source is on.
Flashes when there is not sufficient light for measurement.
Table 2 Light descriptions (continued)
Light Description
Manual
Range
Illuminated when the instrument is in manual ranging mode.
Auto
Range
Illuminated when the instrument is in auto ranging mode.
CAL? Turns on during a calibration if the calibration data is not within the
acceptable range.
Flashes when the instrument should be calibrated.
Note: The CAL? light applies when a 25-mm sample cell is used. Ignore the CAL?
light if illuminated during calibration when a smaller sample cell is used. Push
UNITS/Exit to start measurements.
UNITS
AVG
Illuminated when signal averaging is on.
SETUP Illuminated when Setup mode is selected.
S0–S3 Show the current calibration point standard that is in use during
calibration.
Startup
Turn the instrument on
C A U T I O N
Infrared Light Hazard. The infrared light produced by this instrument can cause
eye injury. The infrared light source in this instrument only receives power when
the sample cell cover is closed.
1. Put the instrument on a stable, level surface that is free of vibration.
Do not put in direct sunlight.
2. Make sure that there is air circulation around the instrument. Keep
the back and area below the instrument free of material that could
decrease air flow through the vents.
3. Connect the power cord to the power plug on the back of the
instrument.
8 English