Hach 2100N, Basic User Manual

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Table 2 Light descriptions (continued)
Light Description
Illuminated when the instrument light source is on.
Flashes when there is not sufficient light for measurement.
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 the USEPA filter and a 25-mm sample cell are
used. Ignore the CAL? light if illuminated during calibration when a different filter
or a smaller sample cell is used. Push UNITS/Exit to start measurements.
RATIO Illuminated when Ratio is on.
SIGNAL
AVG
Illuminated when signal averaging is on.
S0–S4 Show the current calibration point standard that is in use during
calibration.
Startup
Turn the instrument on
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.
4. Connect the power cord to a power socket with ground contact.
5. Push the power switch on the back of the instrument to turn the
instrument on.
Turn the keypad sound off (optional)
By default, the instrument makes an audible sound when a key is
pushed. To turn the keypad sound off:
1. Push and hold down the right arrow key for 3 seconds.
2. Use the arrow keys to select 00.
3. Push ENTER .
4. Use the arrow keys to select the sound option:
Option Description
bP on An audible sound is made when a key is pushed.
bP oF No sound is made when a key is pushed.
5. Push ENTER .
Standard operation
Calibrate the turbidimeter with StablCal
®
Standards
Calibrate the turbidimeter before it is used for the first time using the
StablCal
®
sealed vial standards provided. As an alternative, calibration
can be done with recently prepared formazin standards.
Calibrate the turbidimeter at least every 3 months or as specified by the
regulating authority when data is used for USEPA reporting.
The instrument is ready for calibration 60 minutes after start-up. Keep
the instrument on 24 hours a day if the instrument is used regularly.
Note: Unknown results may occur if standards other than the recommended
calibration points are used. The recommended calibration points (< 0.1, 20, 200,
1000 and 4000 NTU) provide the best calibration accuracy. Use of standards other
than StablCal, or user-prepared formazin, may result in less accurate calibrations.
The manufacturer cannot guarantee the performance of the instrument if calibrated
with co-polymer styrenedivinylbenzene beads or other suspensions.
Prepare the StablCal standards
When received and at intervals:
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