Hanna Instruments LP 2000 User Manual

Instruction Manual

LP 2000

Precision Bench

Turbidity Meter

www.hannainst.com

Dear Customer,
Thank you for choosing a HANNA instruments® product.
Please read the instruction manual carefully before using the instru-

ment, to have all the necessary information for a correct use.
If you need additional technical information, do not hesitate to e-mail

us at [e-mail]
This instrument is in compliance with the directives.

PRELIMINARY EXAMINATION

Remove the instrument from the packing material and examine it to
make sure that no damage has occurred during shipping. If there is
any damage, notify your dealer immediately.

LP 2000 is supplied complete with:

• Glass cuvet with cap

• Calibration solutions (HI 93703-0 AMCO-EPA-1 @0 FTU and
HI 93703-10 AMCO-EPA-1 @10 FTU), 30 mL each

• 12 Vdc power adapter and instructions

Note: Save all packing material until you are sure that the instrument

functions correctly. Any damaged or defective item must be
returned in its original packaging with the supplied accessories.

TABLE OF CONTENTS

PRELIMINARY EXAMINATION ...................................................... 3

GENERAL DESCRIPTION .............................................................. 3

MEASURE UNITS ....................................................................... 4

PRINCIPLE OF OPERATION ......................................................... 4

FUNCTIONAL DESCRIPTION ........................................................ 5

SPECIFICATIONS......................................................................... 6

OPERATIONAL GUIDE ................................................................. 7

CALIBRATION ........................................................................... 10

LCD AND ERROR CODES ........................................................... 13

ACCESSORIES ........................................................................... 14

WARRANTY .............................................................................. 14

CE DECLARATION OF CONFORMITY............................................ 15

GENERAL DESCRIPTION

LP 2000 is a bench microprocessor-based meter used to determine
the turbidity of water and wastewater. The meter covers the 0 to
1000 FTU* range with 0.01 resolution from 0.00 to 50.00 FTU* and
in single digits from 50 to 1000 FTU*. It also auto-ranges between
the two scales.

Note: LP 2000 has been designed according to the ISO 7027

International Standard. The turbidity measurement unit
is FTU (Formazine Turbidity Unit), which is identical to
NTU (Nephelometric Turbidity Unit).

The meter is housed in a rugged and lightweight case, with an easy­to-read LCD.

The meter is simple to use: all operations can be carried out with only
four keys and troubleshooting functions can be performed with error
codes on the display. An exclusive positive-locking system guarantees
that the cuvette is firmly placed in the cell. The keypad is water­resistant and can be wiped clean.

Calibration at 10 FTU* can be easily performed using the supplied
standard. In addition, LP 2000 is the first bench turbidity meter
that allows the storage and retrieval of the last calibration date.

10 FTU* was chosen as the calibration point because its value best
fits the water turbidity measurements in a wide range of applications,
from drinking water to wastewater treatment.

* 1 FTU = 1 NTU

32

MEASURE UNITS

CUVET

LIGHT

D

Hanna Instruments uses the primary standard AMCO-AEPA-1 to
avoid all formazine-related problems. Formazine is a toxic, unstable
substance, which requires particular care. Calibration requiring formazine
standards must be preformed immediately after preparation of the
standards. Formazine standards may not be reused because of their
short life. LP 2000 standards are extremely stable and have a shelf
life of up to six months. Uncontaminated standards may be reused.
LP 2000 can be used with both AMCO-AEPA and formazine stan­dards.

FTU is equal to the NTU. However, other known measurements
include: Jackson Turbidity Unit or JTU (based on the old method of
Jackson's candle), and Silica Unit in mg/L of SiO2. See the conversion
table below for these units:

JTU FTU/NTU SiO2 (mg/L)

JTU 1 19 2.5

FTU /NTU 0.053 1 0.13

SiO2 (mg / L) 0.4 7.5 1

PRINCIPLE OF OPERATION

FUNCTIONAL DESCRIPTION

1) Cuvette holder

2) Dual level LCD (Liquid Crystal Display)

3) ON/OFF key, to switch the meter ON and OFF

4) CAL key, to enter calibration mode

5) READ/, to perform measurements, and set the day and
month of the last calibration

6) DATE/ , to display the last calibration date, and select the



month or day of the last calibration

LP 2000 has been designed to perform measurements according to
the ISO 7027 International Standards.

The instrument functions by passing a beam of infrared light through
a vial containing the sample being measured.

The light source is a High Emission Infrared LED with a wavelength
peaking at 890 nm, which reduces interference caused by colored
samples to a minimum.

A sensor, positioned at 90° with respect to the direction of light,
detects the amount of light scattered by the undissolved particles
present in the sample. The microprocessor converts such readings into
FTU values.

DETECTOR

IR LED

EMITTED LIGHT (890 nm)

* 1 FTU = 1 NTU

90° SCATTERE

LIGHT

i) Socket for 12 Vdc power adapter

54

SPECIFICATIONS

LP 2000

Range 0.00 to 50.00 FTU*

50 to 1000 FTU*

Resolution 0.01 / 1 FTU*
Accuracy ±0.5 FTU* or ±5%

(@ 20°C/68°F) (whichever greater)
Typical EMC Deviation 0.2 FTU*
Calibration 3 points (0, 10 and 500 FTU*)
Light Source High-emission infrared LED
Light Source Life Life of the instrument
Light Detector Silicon photocell
Power Supply 12 Vdc adapter (included)
Environment 0 to 50°C (32 to 122°F);

RH max 95% non-condensing

Dimensions 230 x 170 x 70 mm

(9.1 x 6.7 x 2.7")

Weight 600 g (1.3 lb.)

* 1 FTU = 1 NTU

OPERATIONAL GUIDE

POWER CONNECTION

Plug the supplied 12 Vdc adapter into the DC socket (see page 5).
Plug the adapter to the mains.

Note: Insure the main line is fuse protected.
Note: Always turn the meter off before unplugging it to ensure no

data is lost.

MEASUREMENT PROCEDURE

• Turn the meter on by pressing ON/OFF.

• The meter will first perform an LCD self

diagnostic test by displaying a full set of
figures. It will then switch to the measure­ment mode.

• When the LCD displays “----”, the meter is

ready.

• Fill a clean cuvette up to 0.5 cm (1/4’’)

from its rim with the thoroughly agitated
sample.

• Allow sufficient time for bubbles to escape

before securing the cap.

Note: Do not overtighten the cap.

• Wipe the cuvette thoroughly with

a lint-free tissue (HI 93703-70)
before inserting the cuvette into
the measurement cell. The cuvette
must be completely free of finger
marks, oil or dirt, especially in the
area where the light passes
through, i.e. approximately the
bottom 2 cm (3/4” inch) of the
cuvette.

• Place the cuvette into the holder

and check that the notch on the
cap is positioned securely into the
groove.

76

• The mark on the cuvette cap should point
towards the keyboard.

• Press the READ/ key and the LCD will display an intermittent
“SIP” (Sampling In Process).

• The turbidity value will appear after ap­proximately half a minute.

• Though LP 2000 covers a wide turbidity range, highly accurate
readings exceeding 40 FTU require dilution as recommended by
the Standard Methods.

Use the formula below to calculate the amount of HI 93703-0 or
turbidity-free water needed for accurate dilution.
The total volume = 100 mL.

Vos = 3000 / T

where:

Vos = volume of original sample (mL) to be added to HI 93703-0

to obtain the total diluted volume of 100 mL.

T = LP 2000 reading (exceeding 40 FTU)

E.g.: LP 2000 reading = 200 FTU

3000 / 200 = 15 mL (Vos)
15 mL (Vos)+85 mL (HI 93703-0) = 100 mL

At this point, take a sample of this diluted solution and measure its
turbidity.

The correct turbidity value of the original sample is derived by:

Ta= Tn x 100 mL / Vos

where:

Ta = actual turbidity value of the original sample
Tn = LP 2000 reading of the diluted solution

E.g. If Tn = 27

Ta = 27 x 10 0 mL / 15 mL = 180 FTU

TIPS TO OBTAIN BEST ACCURACY

• Each time the cuvette is used, tighten the cap to the same

degree.

• Discard the sample immediately after the reading is taken to

prevent permanent clouding of the glass.

• All glassware used to contain the standards and the samples
should be kept clean, washed with HI 93703-50 cleaning
solution and rinsed with HI 93703-0 or turbidity-free water.

• Samples should be collected in clean glass or plastic bottles with
appropriate stoppers. Analysis should be performed shortly after.
If the sample requires storage, it should be kept in a cool dark
place. Stored samples should be restored to room temperature
prior to analysis. Samples may not be stored for longer than 24
hours.

• To obtain a representative sample, gently and thoroughly, stir
the solution. To prevent air bubbles from forming do not shake or
let the solution settle prior to sampling.

• Monthly calibration of the meter, using HI 93703-10 @ 10 FTU
standard is recommended.

• Before inserting cuvettes into the instru­ment, wipe them with HI 93703-70 or a
soft, lint-free tissue. Handle vials so that
no fingerprints are left on the areas where
light passes through, i.e. the bottom 2 cm
(3/4”) of the cuvette.

If you experience any problems in taking measurements, please
contact your dealer or the nearest Hanna Customer Service Depart­ment.

SOURCES OF INTERFERENCE

• The presence of floating debris and coarse sediments which may
settle rapidly will give false readings.

• The infrared light source of LP 2000 can effectively minimize
errors due to colored substances found dissolved in solution. This
“True Color” effect is the most common interference found in
commercial instruments operating in the visible light range.

• Air bubbles and the effect of vibrations that disturb the surface of
the sample may produce false results.

• Dirty, scratched, or etched glassware will also affect readings.

98

CALIBRATION

Calibration is recommended at least once a month. You can verify the
instrument calibration by comparing the display reading against the
supplied standard solution at 10 FTU. To check the date of the last
calibration, simply hold the DATE/ key down for a few seconds.

CALIBRATION PROCEDURE

• Turn the meter on and wait for the display

to show "----".

• Press the CAL key once. "CAL" will blink on the display for approx.

6 seconds, allowing for confirmation.

• While "CAL" is still blinking, press CAL again (otherwise, it exits

this mode). "CL" will appear on the lower part of the display.

• The date of calibration may now be edited

by simply pressing the DATE/ key. The
default parameter, which is the month
segment found on the left, will blink. To
scroll to the correct number, press the
READ/s key. To toggle between month
and the day display segments, press the
DATE/ key. The day segment can also
be edited with the READ/s key.

• To confirm the displayed values and to proceed, press CAL once

more. An intermittent "ZERO" will appear on the LCD.

• Using the HI 93703-0 bottle containing
the ZERO FTU Standard (or turbidity-free
water), fill the measurement cuvette and
secure the cap.

Note: To minimize error caused by the cu-

vette, it is recommended to use the
same cuvette for calibration and mea­surement.

• Insert cuvette into the holder.

• Press CAL. An intermittent “SIP” indicates that the instrument is
being calibrated.

• After approximately 1 minute, the instru­ment will ask for the HI 93703-10
standard solution @ 10 FTU by display­ing “10.0”.

• Refill the cuvette with the HI 93703-10
AMCO-AEPA-1 standard at 10 FTU and
place it into the measurement cell

• After the second calibration point (10

FTU) has been accepted, the meter will
display “500”, asking for the 500 FTU
solution to be placed in the cuvet holder.

Note: At this point the user can exit the calibration mode and save

the two-point calibration by pressing READ.

To perform a three-point calibration, place the 500 FTU standard
solution in the cuvet holder.

• Press CAL: “SIP” and “CL” will start
blinking.

• After approximately 30 seconds, the dis­play will show "----".

Now the meter is calibrated and ready for use.

1110

TIPS TO OBTAIN ACCURATE CALIBRATION

• All glassware that comes into contact with standards should be
kept clean. Wash with HI 93703-50 cleaning solution and rinse
with HI 93703-0 or turbidity free water.

• Rinse the cuvette twice with 5 mL of the sample, to remove any
previous liquid, dust or foreign matter that may be present.
Gently pour the liquid down the side of the vial to reduce air
bubbles (no mixing is required when Hanna standards are used).

• Before inserting the vial into the meter,
wipe it clean with HI93703-70 or a soft,
lint-free tissue. Handle vials so that no
fingerprints are left on the areas where
light passes through (bottom 2 cm).

STANDARD SUSPENSION

Presently, there are only two recognized primary standards: AMCO-AEPA-1
(available through Hanna) and formazine. LP 2000 works with both
solutions.

AMCO-AEPA-1 has a much longer shelf life at all concentrations
(approximately six months, if free from contamination). In addition,
no special handling or disposal is required and a much higher
stability of suspended particles has been observed.

Formazine is highly toxic and is generated by a known carcinogen,
with poor stability (particles settle quickly). Lower concentrations
change value quickly after dilution.

The consistency of LP 2000 readings by using both standards has
been separately established by Advanced Polymer Systems and
Hanna Instruments. Additional documentation about the formazine
standard and other calibration procedures is available upon request.

VIEWING THE CALIBRATION DATE

• Turn the meter on and wait for the
display to show "----".

LCD AND ERROR CODES

LP 2000 displays several different codes and messages to help the
user to operate the meter more efficiently.

This indicates that the meter is in a ready
state and measurement or calibration can be
performed.

This indicates that the calibration mode is
active. If the CAL key is not pressed within 6
seconds, the meter will automatically revert
back to the measurement mode.

This indicates that the calibration date setting
mode is active.

This indicates that a 0 FTU standard calibra­tion solution is required.

This indicates that a 10 FTU standard calibra­tion solution is required.

This indicates that a 500 FTU standard cali­bration solution is required.

This blinking SIP (Sample In Progress) mes­sage indicates that the instrument is being
calibrated.

This shows the last calibration date (MM.DD).

• Press and hold the DATE/ key. The month and day of last
calibration ("MM.DD") appear while the key is held down.

Note: The displayed date is the date that was input by the user at

the beginning of the last calibration.

This indicates that the sample is being ana­lyzed.

This indicates that an error occurred during
calibration (e.g. a wrong standard was used).
Repeat the calibration with fresh standards.

1312

ACCESSORIES

HI 710005 12 Vdc / 115 Vac voltage adapter, US plug
HI 710006 12 Vdc / 230 Vac voltage adapter, European plug
HI 731318 Tissue for wiping cuvettes ( 4pcs)
HI 731321 Glass cuvet (4 pcs)
HI 731325 Cap for cuvette (4 pcs)
HI 93703-0 Calibration solution AMCO-AEPA-1 @0 FTU, 30 mL
HI 93703-05 Cal. solution AMCO-AEPA-1 @500 FTU, 30 mL
HI 93703-10 Calibration solution AMCO-AEPA-1 @10 FTU, 30 mL
HI 93703-50 Cuvette cleaning solution, 230 mL

WARRANTY

All Hanna Instruments meters are warranted for two years
against defects in workmanship and materials when used for their
intended purpose and maintained according to instructions. This
warranty is limited to repair or replacement free of charge.

Damage due to accident, misuse, tampering or lack of prescribed
maintenance are not covered.

If service is required, contact the dealer from whom you purchased the
instrument. If under warranty, report the model number, date of
purchase, serial number and the nature of the failure. If the repair
is not covered by the warranty, you will be notified of the charges
incurred. If the instrument is to be returned to Hanna Instruments,
first obtain a Returned Goods Authorization number from the Cus­tomer Service department and then send it with shipping costs
prepaid. When shipping any instrument, make sure it is properly
packaged for complete protection.

CE DECLARATION OF CONFORMITY

All rights are reserved. Reproduction in whole or in part is
prohibited without the written consent of the copyright owner.

Hanna Instruments reserves the right to modify the design, con­struction and appearance of its products without advance notice.

Recommendations for Users

Before using this product, make sure that it is entirely suitable for the environment in which it is used.

Operation of this instrument in residential area could cause unacceptable interferences to radio and TV
equipments, requiring the operator to take all necessary steps to correct interferences.

Any variation introduced by the user to the supplied equipment may degrade the instrument's EMC
performance. To avoid electrical shock, do not use this instrument when voltages at the measurement
surface exceed 24 Vac or 60 Vdc.

To avoid injury or damage to the meter, do not perform any measurement in microwave ovens.

SALES AND TECHNICAL SERVICE CONTACTS

Australia:

Tel. [phone] • Fax [phone]

China:

Tel. [phone] • Fax [phone]

Egypt:

Tel. & Fax [phone]

Germany:

Tel. [phone] • Fax [phone]

Greece:

Tel. [phone] • Fax [phone]

Indonesia:

Tel. [phone] • Fax [phone]

Japan:

Tel. [phone] • Fax [phone]

Korea:

Tel. [phone] • Fax [phone]

Malaysia:

Tel. [phone] • Fax [phone]

Singapore:

Tel. [phone] • Fax [phone]

South Africa:

Tel. [phone] • Fax [phone]

Taiwan:

Tel. [phone] • Fax [phone]

Thailand:

Tel. [phone] • Fax [phone]

United Kingdom:

Tel. [phone] • Fax [phone]

USA:

Tel. [phone] • Fax [phone]

For e-mail contacts and complete list of Sales and
Technical offices, please see www.hannainst.com

MANLP2000R2 11/05