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RS232 PORT

The 2020 Turbidimeter may be interfaced with any IBM compatible computer

using an Interface cable (Code 1772). The meter may also be interfaced with an

RS-232 serial printer, using an appropriate cable and setting the printer

configuration to the output below.
Output: RS232 compatible, asynchronous serial, 9600 baud, no parity, 8 data bits,

1 stop bit.
Computer Connection: RS232-(1772) interface connection, 8 pin mDIN/9 pin F

D-submin.
Pin out:

RS-232 TxD

RS-232 RxD

4, 6, 8

digital ground

Содержание 2020

Страница 1: ......

Страница 2: ...ured 8 9 GENERAL OPERATING INFORMATION Overview 10 11 The Keypad 12 The Display 12 Turbidity Tubes 13 14 CALIBRATION Standard Solutions 15 Calibration Procedure 16 ANALYSIS PROCEDURES WITH THE 2020 Selecting the EPA Mode 17 Turbidity Measurement 18 Preparation of Turbidity Free Water 19 20 Dilution Procedures 21 Testing Tips 21 TROUBLESHOOTING GUIDE 22 RS232 PORT 23 MAINTENANCE OF THE 2020 Replaci...

Страница 3: ...sult in personal injury or damage to the instrument The 2020 Turbidimeter should not be stored or used in a wet or corrosive environment Care should be taken to prevent water from wet turbidity tubes from entering the turbidimeter light chamber NEVER PUT WET TUBES IN THE TURBIDIMETER SAFETY PRECAUTIONS Read the label on all reagent containers Some labels include precautionary notices and first aid...

Страница 4: ... Not required Automatic Shut Off 2 minutes Lamp Tungsten Filament bulb approximate life 800 hours Sample 15 mL in capped tube Sample Chamber Accepts 25mm diameter flat bottomed tubes capped Power source Battery Operation 9 Volt Alkaline Line Operation 120V 50Hz 220V 60Hz with supplied adapter Size L X W X H 8 5 x 16 2 x 6 7 cm 3 4 X 6 4 X 2 6 inches Shipping Weight Meter only 11 oz 312g Kit 3 lb 7...

Страница 5: ... 0943 Syringe 0598 Filter holder 1103 6 Membrane Filters 0 45 micron pkg of 6 5115PS Deionized Water 6195 H Formazin Turbidity Standard 4000 NTU EPA COMPLIANCE This instrument meets or exceeds EPA design specifications for NPDWR and NPDES turbidity monitoring programs as specified by the USEPA method 180 1 There is also a compliance reading mode which rounds the reading to meet EPA reporting requi...

Страница 6: ...CE COMPLIANCE The 2020 Turbidimeter has been independently tested and has earned the European CE Mark of compliance for electromagnetic compatibility and safety 6 ...

Страница 7: ...s may become concentrated and settle out as a sludge that will damage equipment and cause foaming In cooling water systems particles can interfere with corrosion inhibitors Water clarity is improved with fluid particle separation processes such as sedimentation coagulation and filtration In swimming pools cloudy water is a common problem The usual causes for poor water clarity are corrosion improp...

Страница 8: ...thod Comparative methods are used in shallow water and determine turbidity by matching the turbidity of a water sample to a standard of known turbidity either with a target at the bottom of a tube or with a turbidity comparator In the deeper waters of lakes ponds rivers and estuaries the Secchi disk is often used to measure turbidity The Secchi disk is a disk about eight inches in diameter that is...

Страница 9: ... the tube and results were reported numerically as Jackson Turbidity Units JTU The lowest turbidity that can be determined with this method is 25 Nephelometric Turbidity Units NTU Since the EPA s Surface Water Treatment requirements state that finish water from municipal treatment plants will have a turbidity less than 1 NTU indirect methods were developed to measure turbidity Turbidimeters are th...

Страница 10: ... a sealed keypad The microprocessor enables auto ranging over the full range of 0 to 1100 NTU and provides direct digital readout with a resolution of 0 01 NTU for the lowest range The optics feature a tungsten bulb light source with a life expectancy of 800 hours The light is detected by a silicon photo diode The 2020 is supplied with a 9 volt alkaline battery and an AC power adapter A RS 232 ser...

Страница 11: ...11 ...

Страница 12: ...THE KEYPAD 12 ...

Страница 13: ...s in the glass After a tube has been filled and capped it should be held by the cap and the outside surface should be wiped with a clean lint free absorbent cloth until it is dry and smudge free Handling the tube only by the cap will avoid problems from fingerprints Always set the clean tube aside on a clean surface that will not contaminate the tube Variability in the geometry and quality of the ...

Страница 14: ...erent readings on the same sample in low turbidity water If greater accuracy is required such as for Drinking Water requirements the tubes supplied with the 2020 should be individually calibrated This procedure is important for reading below 10 NTU but is probably not needed for samples above 10 NTU 14 ...

Страница 15: ...hin 1 if the following precautions are observed u The standards will remain stable for up to 4 years prior to opening if stored between 10 and 40 C u Once the seal of the bottle is broken the stability of the standard is only guaranteed for 1 year if stored between 10 and 40 C u Never pour any unused or used standard back into the primary standard bottle u Do not open the bottle in a dusty or dirt...

Страница 16: ...CALIBRATION PROCEDURE 16 ...

Страница 17: ...ating mode displays the measured turbidity to the full resolution of the meter The EPA mode displays the measured turbidity rounded to the reporting requirements of the EPA and Standard Methods compliance monitoring programs This greatly simplifies the reporting requirements by eliminating the need for the user to manually round off the results according to EPA specifications The EPA requires thes...

Страница 18: ...TURBIDITY MEASUREMENT 18 ...

Страница 19: ...y free water The filter filter holder and syringe must be conditioned by forcing at least two syringes full of deionized water through the filtering apparatus to remove foreign matter The first and second rinses should be discarded Turbidity free water as prepared below may be stored in the dark at room temperature in a clean glass bottle with a screw cap and used as required The storage container...

Страница 20: ...re that no holes or cracks are present Depending on the nature of the unfiltered water it is possible to prepare a liter or more of turbidity free water using a single filter The membrane filter may be stored in the holder indefinitely and used as required 20 ...

Страница 21: ...after collection 3 Discard tubes that are badly scratched 4 Gently mix sample by inverting before taking a reading but avoid introducing air bubbles 5 Turbidity readings will be affected by electric fields around motors 6 Carbon in the sample will absorb light and cause low readings 7 Observe shelf life recommendations for turbidity standards 8 The turbidimeter should be placed on a surface free f...

Страница 22: ... Verify with another meter Check other meter calibrations Check tube alignment Re align tube Check sample tubes for dirt and scratches Check clean and or replace if necessary Check to see if internal meter components are wet Always dry tubes before inserting Examine chamber for visible moisture Contact LaMotte for Return Authorization Return for calibration check Very low battery Change battery Ov...

Страница 23: ...rfaced with an RS 232 serial printer using an appropriate cable and setting the printer configuration to the output below Output RS232 compatible asynchronous serial 9600 baud no parity 8 data bits 1 stop bit Computer Connection RS232 1772 interface connection 8 pin mDIN 9 pin F D submin Pin out 5 RS 232 TxD 3 RS 232 RxD 4 6 8 digital ground 23 ...

Страница 24: ...nd disconnect the battery from the polarized plug 3 Carefully connect the new battery to the polarized plug and insert it into the compartment 4 Close the battery compartment lid REPLACING THE LAMP The tungsten lamp included with the model 2020 has a life of approximately 800 hours If the display becomes unstable when using LaMotte AMCOTM standards call LaMotte Company for a return authorization n...

Страница 25: ...5 17 99 61799 ...

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