Hanna Instruments LP 2000-11 User Manual

Instruction Manual
LP2000-11
Precision Bench
Turbidity Meter
with PC Communication
www.hannainst.com
Dear Customer, Thank you for choosing a Hanna Product. Please read this instruction
manual carefully before using the instrument. It will provide you with the necessary information for the correct use of the instrument, as well as a precise idea of its versatility.
If you need additional technical information, do not hesitate to e-mail us at tech@hannainst.com.
These instruments are 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.
LP2000-11 is supplied with:
Glass cuvet with cap
• AMCO-EPA-1 turbidity calibration solutions (HI 93703-0 @0 FTU and HI 93703-10 @10 FTU), 30 mL each
12 Vdc power adapter and instruction manual
Note: Save all packing material until you are sure that the instrument
functions correctly. Any defective item must be returned in its original packaging with the supplied accessories.
TABLE OF CONTENTS
Preliminary Examination ............................................................. 3
General Description ..................................................................... 3
Principle of Operation ................................................................. 4
Specifications.............................................................................. 5
Functional Description ................................................................. 6
Operational Guide ...................................................................... 7
Power Connection ........................................................ 7
Measurement Procedure ...................................................... 7
Storing samples in memory ................................................ 10
Clearing Logged Data........................................................ 10
Viewing Logged Data ........................................................ 11
Date and Time setup ......................................................... 11
Error Codes ....................................................................... 12
Ensure Accurate Measurements ........................................... 13
Sources of Interference ....................................................... 14
Calibration............................................................................... 14
Calibration Procedure ........................................................ 14
Viewing Calibration Date ................................................... 16
Ensure Accurate Calibration ................................................ 17
Standard Suspension ........................................................ 17
RS 232 Connection ................................................................... 18
Accessories ................................................................................ 18
Warranty................................................................................. 19
LP2000-11 turbidity meter is a bench top, microprocessor-based instrument used to determine the turbidity of water and wastewater. The meter covers a 0-1000 FTU range in two scales: 0.00 to 50.00 FTU and 50 to 1000 FTU. The autoranging feature sets the appropriate range for the measurement. The serial interface is supported connecting any available serial port on your PC and a 5-pin socket on the meter. Note: LP2000-11 has been designed according to the ISO 7027
International Standard, consequently the turbidity measurement units are expressed in FTU (Formazine Turbidity Unit). FTU is identical to the other internationally recognized unit NTU (Nephelometric Turbidity Unit).
LP2000-11 is housed in a rugged and lightweight case, with an easy-to-read LCD.
The meter is simply to use. All operations can be carried out with only five keys and troubleshooting functions can be performed with displayed error code guides. A positive-locking system guarantees that the cuvet is firmly placed in the cell. The keypad is water-resistant
and can be wiped with a moist cloth for quick cleanups. Two or three points calibration (0, 10, 500 FTU*) can be easily
performed using available standards.
* 1 FTU = 1 NTU
32
CUVET
LIGHT
D
In addition, LP2000-11 automatically stores the last calibration date, that may be retrieved by a single key touch.
10 FTU* was chosen as the standard calibration point because its value best fits the water turbidity measurements in a wide range of applications, from drinking water to wastewater treatment.
Hanna uses the primary standard AMCO-AEPA-1 to avoid all formazine­related problems. In fact formazine is a toxic, unstable substance, which requires particular care. Its standards have to be prepared only a few minutes before performing the calibration, and cannot be reused because of their short life.
Hanna standards are extremely stable, can be reused, and last up to six months, if free from contaminations.
LP2000-11 can be used with both standards.
As noted above, 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
LP2000-11 has been designed to perform measurements according to the ISO 7027 International Standards.
The instrument works by passing a beam of infrared light through a vial containing the sample to be measured.
The light source is a High Emission Infrared LED with a wavelength peaking at 890 nm, which reduces interferences caused by colored samples to a minimum.
DETECTOR
IR LED
EMITTED LIGHT (890 nm)
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.
90° SCATTERE
LIGHT
SPECIFICATIONS
Range 0.00 to 50.00 FTU*
50 to 1000 FTU*
Resolution 0.01 / 1 FTU* Accuracy (@ 20°C/68°F) ±0.5 FTU*
±5% of reading (whichever greater)
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 power 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* 1 FTU = 1 NTU
54
FUNCTIONAL DESCRIPTION
OPERATIONAL GUIDE
POWER CONNECTION
Plug the supplied 12 Vdc adapter into the proper instrument socket and 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 the ON/OFF key.
The meter will carry out a self-test by displaying a full set of figures.
1. Measurement cell
2. STO/VIW key, to store sample after reading and view log memory
3. READ/DATE key, to perform measurements and display (toggle) current date/time
4. ALT key, to activate the ALT functions (orange keys)
5. GLP/CAL key, to display (toggle) last calibration date/time and enter the calibration mode
6. ON/OFF/CLR key to switch the meter ON and OFF, and clear log memory
7. Secondary LCD (displays the year when date is on the primary level, the sample index when storing a value or viewing the log memory)
8. Primary LCD (Liquid Crystal Display)
i. 5-pin RS232 connector
ii. Power supply socket
When the LCD displays “- - --” the meter is ready to take measure­ments.
Fill a clean cuvet up to 0.5 cm (one quarter inch) from its rim with the thoroughly agitated sample.
1/4“
0.5 cm
Allow sufficient time for bubbles to escape before securing the cap.
Note: Do not overtighten the cap.
76
Note: Wipe the cuvet thoroughly with HI93703-70 or a lint-free tissue before
inserting it into the measurement cell. The cuvet must be completely free of fingerprints and other oil or dirt, par­ticularly in the area where the light goes through (approx. the bottom 2 cm/1").
Place the cuvet into the cell and check that the notch on the cap is positioned securely into the groove.
• The mark on the cuvet cap should point towards the keyboard.
• Even though LP2000-11 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 = LP2000-11 reading (exceeding 40 FTU)
E.g.: LP2000-11 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 = LP2000-11 reading of the diluted solution
E.g. If Tn = 27
Ta = 27 x 100 mL / 15 mL = 180 FTU*
Press the READ key and the LCD will display a blinking “SIP” (Sam­pling in Process). The turbidity value will appear after approxi­mately 20 seconds.
Note: Any sample above 1000 FTU* will show out of range by blinking “1000”.
* 1 FTU = 1 NTU
98
STORING SAMPLES IN MEMORY
VIEWING LOGGED DATA
After taking a reading, press the STO button. The last sample read will be stored in memory and the display will also show on the bottom right hand corner the reference number of the stored sample.
Note: When the maximum number of
samples has been reached (500), the display will show "FULL". This is a warn­ing that you will be overwriting the oldest sample recorded. To store the current sample, press the STO button again and this will overwrite the oldest sample in the memory. All samples are shifted and sample number one is always the oldest sample.
CLEARING LOGGED DATA
Press the ALT & CLR but­tons. The display will show "CLR" for confirmation. Press ALT & CLR again to clear memory or any other key to abort the opera­tion.
Press the ALT & VIEW but­tons. The last stored sample will be displayed.
Press the right arrow to scroll between turbidity value, date and time sample was taken.
Press the UP/DOWN arrows to scroll between samples taken.
Press ALT & VIEW buttons again to exit this mode.
DATE AND TIME SETUP
VIEWING:
Press ALT & DATE to toggle between date and time.
SETTING:
Press and hold ALT & DATE for 3-4 seconds.
ALL SAMPLES PREVIOUSLY STORED WILL BE ERASED FROM MEMORY!
Press UP/DOWN arrows to cor­rect and set the year.
1110
Press right arrow to scroll to month and day, use UP/DOWN to set.
Press right arrow again to scroll to time, use UP/DOWN to set.
Internal Bus error*
err5
Press right arrow again to save and exit date and time setup.
Note: Press ALT & DATE to leave this mode without saving.
ERROR CODES
Every time the meter is switched on, the Real Time Clock and EEPROM are tested, and if an error is found the corresponding error code will be displayed. The list of error codes is as follows:
NO cover error (check cuvet position)
Calibration error
(check calibration standard value)
cap
err1
err2
RTC (Real Time Clock) error *
EEPROM error*
err3
Low LED Voltage*
* Contact the nearest HANNA Customer Service Center.
ENSURE ACCURATE MEASUREMENTS
• Each time the cuvet is used, tighten the cap to the same degree.
• Discard the sample immediately after reading to prevent perma­nent clouding of the glass.
• All glassware used to contain the standards and the samples should be kept clean, washed with HI93703-50 cleaning solution and rinsed with HI93703-0 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 the 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.
• It is recommended to calibrate the meter by using the supplied HI93703-10 (10 FTU* standard), at least monthly or more frequently for greater accuracy.
• Before inserting cuvets 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 (approx. the bottom 2cm / 3/4”).
Serial communication error*
err4
If you experience any problems in taking measurements, please contact your dealer or the nearest Hanna Customer Service Center.
1312
SOURCES OF INTERFERENCE
• The presence of floating debris and coarse sediments which may settle out rapidly will give false readings.
• The infrared light source of LP2000-11 turbidity meter complies with the ISO 7027 International Standard and can effectively minimize errors due to colored dissolved substances. This effect, called “True Color”, is a common interference for most commercially available instruments operating in the range of visible light.
• Air bubbles and the effect of vibrations that disturb the surface of the sample may produce false results and should be avoided.
• Dirty, scratched, or etched glassware could also affect readings.
Place the 0.00 FTU standard in the cuvet holder.
Press CAL; SIP and CL will start blinking.
CALIBRATION
To check the date of last calibration, simply press the GLP key. Press again to toggle between date and time.
To make sure that the meter is calibrated, take a measurement of a standard solution.
The instrument can be calibrated at two or three points and a monthly calibration is recommended.
CALIBRATION PROCEDURE
Turn the meter on and wait for the display to show "----".
Press the ALT & CAL buttons. The "CAL" message will blink on the display for 3 seconds. The meter then enters the calibration mode, displaying "0.00" and prompting the user to insert the 0.00 FTU standard.
If “ERR1” appears on the LCD, please check the standard solution.
After approximately 30 seconds the meter will display “10.00”, prompting the user to place the 10.00 FTU standard solution in the cuvet holder.
Place the 10.00 FTU standard in the holder and press CAL. SIP and CL will start blinking.
After approximately 30 seconds the meter will display 500, asking the user to place the 500 FTU standard solution in the cuvet holder.
Note: At this point the user can save the two-point calibration setup and leave the calibration mode by pressing ALT & CAL buttons.
err1
1514
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 LCD will
display "----". Now the instrument is calibrated and ready
for use.
Note: If "ERR1" is displayed, the calibration data is maintained.
ENSURE ACCURATE CALIBRATION
The procedure below should be carefully followed during testing and
calibration:
All glassware that comes into contact with standards should be kept clean. Wash it with HI93703-50 cleaning solution and rinse it with HI93703-0 or turbidity free water.
Rinse the cuvet twice with 5 ml of the liquid to be tested. This procedure removes the effect of any previous liquid and any dust or objects that may be inside. Gently pour the liquid down the side of the vial to reduce air bubbles (no mixing is required when HI93703-0 and HI93703-
10 AMCO-AEPA-1 standards are used).
Before inserting the cuvet into the instrument, wipe it with HI 93703­70 or a soft, lint-free tissue. Handle vials so that no fingerprints can
get on the areas where light passes (approx. bottom 2 cm/1") .
STANDARD SUSPENSION
VIEWING CALIBRATION DATE
To display the last calibration time and date, press the GLP button. If
display shows "FS", the instrument has factory calibration settings loaded and no date will be displayed.
VIEWING FIRMWARE VERSION
To display the firmware version, turn the meter on, then press and hold the ON/OFF key for approximately 10 seconds.
Presently, there are only two recognized primary standards: AMCO-AEPA­1 and formazine. Hanna supplies LP2000-11 with the AMCO-AEPA-1 which has a much longer shelf life at all concentrations (approx. 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. On the other hand, formazine is a toxic substance, generated by a carcinogen, with poor stability (particles flocculate and settle quickly). Low concentrations change value within a few days or hours after dilution. The consistency of LP2000-11 readings by using both standards has been separately established by Advanced Polymer Systems and Hanna Instruments. Additional documentation about the formazine standard and more complex calibration procedures is available upon request.
1716
RS232 CONNECTION
WARRANTY
To communicate with the instrument through the HI92000 software, simply use HI920011 (optional) cable to connect the 9-pin serial port of an IBM compatible computer and the 5 pin connector of the meter. A connected meter will fully maintain its functionality, being able to perform data transfer while the meter is operating.
Note: RS232 communication is not allowed while calibrating the meter.
ACCESSORIES
HI 710005 12 Vdc / 115 Vac power adapter, US plug HI 710006 12 Vdc / 230 Vac power adapter, European plug HI 731318 Tissue for wiping the cuvets (4 pcs) HI 731321 Glass cuvet (4 pcs) HI 93703-0 0 FTU* AMCO-AEPA-1 calibration solution
(30 mL)
HI 93703-05 500 FTU* AMCO-AEPA-1 calibration solution
(30 mL)
HI 93703-10 10 FTU* AMCO-AEPA-1 calibration solution
(30 mL)
HI 93703-50 Cuvet cleaning solution (230 mL) HI 92000 Windows® compatible software HI 920011 PC connection serial cable (5 to 9-pin)
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.
Hanna Instruments reserves the right to modify the design, construc­tion and appearance of its products without advance notice.
* 1 FTU = 1 NTU
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 24VAC or 60VDC. To avoid damages or burns, do not perform any measurement in microwave ovens.
1918
SALES AND TECHNICAL SERVICE CONTACTS
Australia:
Tel. (03) 9769.0666 • Fax (03) 9769.0699
China:
Tel. (10) 88570068 • Fax (10) 88570060
Egypt:
Tel. & Fax (02) 2758.683
Germany:
Tel. (07851) 9129-0 • Fax (07851) 9129-99
Greece:
Tel. (210) 823.5192 • Fax (210) 884.0210
Indonesia:
Tel. (21) 4584.2941 • Fax (21) 4584.2942
Japan:
Tel. (03) 3258.9565 • Fax (03) 3258.9567
Korea:
Tel. (02) 2278.5147 • Fax (02) 2264.1729
Malaysia:
Tel. (603) 5638.9940 • Fax (603) 5638.9829
Singapore:
Tel. 6296.7118 • Fax 6291.6906
South Africa:
Tel. (011) 615.6076 • Fax (011) 615.8582
Taiwan:
Tel. 886.2.2739.3014 • Fax 886.2.2739.2983
Thailand:
Tel. 66.2619.0708 • Fax 66.2619.0061
United Kingdom:
Tel. (01525) 850.855 • Fax (01525) 853.668
USA:
Tel. (401) 765.7500 • Fax (401) 765.7575
For e-mail contacts and complete list of Sales and Technical offices, please see www.hannainst.com
20
MANLP2000-11 11/05
Loading...