Hach Lange 2100AN Basic User Manual Download

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Option

Description

Sets the month and day (MM-DD).

Sets the year (YY).

Push

ENTER

Use the arrow keys to change the value.

Push

ENTER

Push

SETUP

Show the current time (optional)

Push

SETUP

. The SETUP light turns on.

Use the arrow keys to select 08.

Push

ENTER

. The current time is shown on the display (HH-MM-

SS).

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.
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
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:

Clean the exterior surface of the StablCal vials with laboratory glass
cleaning detergent.

Rinse the vials with distilled or deionized water.

Dry the vials with a lint-free cloth.

Note: Never shake or invert the < 0.1 NTU standard. If the standard has been
mixed or shaken, do not move the vial for 15 minutes or more before using.
Note: Do not remove the caps from the sealed vials.

Make sure that the StablCal standards are at ambient instrument
temperature before use (and no greater than 40 °C (104 °F)).
Mix the standards before use:

Open the case lid. Remove the < 0.1 NTU standard from the plastic
case.

Leave the other standards in the case. Close the case lid.

Shake the case vigorously for at least 10 seconds.

Let the standards stand with no movement for 3–5 minutes before
use.

Calibration notes

• Make sure that the instrument is in the same ambient conditions as

where it is used.

• Make sure that the standards are at the same ambient temperature as

the instrument before use.

• Use only the provided silicone oil. This silicone oil has the same

refractive index as the vial glass and masks minor glass differences
and scratches.

• Store the oiling cloth in a plastic storage bag to keep the cloth clean.
• If power is lost during calibration, the new calibration data is lost and

the last calibration data is used. To exit a calibration and not save the
new values, push

UNITS/Exit

• In Calibration mode, automatic range and signal averaging on are

selected. When calibration is completed, all operational modes go
back to the last settings.

• All nephelometric (turbidity units of measure) calibrations are done at

the same time.

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