Hach-Lange 2100 AN Laboratory Turbidimeter User Manual - Manual (Page 14)

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 SETUP. The SETUP light turns on.
2. Use the arrow keys to select 00.
3. Push ENTER.
4. Use the arrow keys to select the sound option:
Option Description
BEEP ON An audible sound is made when a key is pushed.
BEEP OFF No sound is made when a key is pushed.
5. Push ENTER.
6. Push SETUP.
Set the date and time
1. Push SETUP. The SETUP light turns on.
2. Use the arrow keys to select an option:
Option Description
05 Sets the hours and minutes (HH-MM).
06 Sets the month and day (MM-DD).
07 Sets the year (YY).
3. Push ENTER.
4. Use the arrow keys to change the value.
5. Push ENTER.
6. Push SETUP.
Show the current time (optional)
1. Push SETUP. The SETUP light turns on.
2. Use the arrow keys to select 08.
3. Push ENTER. The current time is shown on the display (HH-MM-
SS).
4. Push SETUP.
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. Refer to
Calibrate the turbidimeter with formazin standards on page 40.
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, 4000 and 7500 NTU) provide the best calibration accuracy. Use of standards
other than StablCal, or user-prepared formazin, may result in less accurate
12 English