Thanks for buying and using themodelSX751 pH/ORP/Conductivity/DO Meter (the following called “meter”inshort).

Before using this meter, please read the operationmanualcarefully in order to help use and maintain it correctly. On the basis of improving instrument of performance constantly, we reserve the right of changing the contentof this manual and accessoriesin case of not notifying in advance.

This meter is a perfect combination with the most advanced electronictechnology, sensortechnologyand software design. The meter can measure the parameters ofpH,ORP, conductivity, TDS, salinity, resistivity, DO and temperature for high accuracy water solution.It is the bestportablewater analysis meter with the highest performance and the lowest cost. It is suitable for thetradesuch as theminingindustry, power plant, water treatment projectsand environmental protection, etc., especially has more extensive application in the field andspot test.

Builtin microprocessor chip,beautifulappearance, multifunctionaland easy to use, this meter has the following prominentfeatures:

1.1.Multiparametermeter, equipped withpHelectrode,ORP Electrode,conductivity electrode, temperature electrode,DO electrode, when connect the electrode to the meter, the meter can automatically know the electrode, easy to use.

1.2.Builtin microprocessor chip.. Itsfeatures up to automatic calibration, automatic temperature compensation,data storage,auto power off, low voltage indication,function setting andautomatic selfdiagnose etc.

1.3.Adopts digital filter and step slipping technology toinligentlyimprove meters response speed and resultaccuracy.

1.4.Automatically recognize 13 kinds ofpHstandardbuffer solution. User can choose anyone fromthreeseries of buffersolutions: Europe &U.S.A. series, NIST series,China series.

1.5.High purified water and ammonia added purified water pH measuring mode can be set up, for this two specialpHmeasuring modes, besides the general slope temperature compensation, also added function of nonlinearity solution temperature compensation to make measurement more accurate, especially suitable for the fields of electric power and petrochemical etc.

1.6.Adopts advanced automatic frequency convertible and voltageregulationtechnology to enlarge themeasuringrange of conductivity electrodewhichconstantK=1to 10 times. It can meet measuring accuracyrequirement for range within 0 to 200mS/cmby using only onepoint calibration. It is the particular onepoint calibration functionfor this meter.

1.7.Automatically recognize 8 kinds of conductivity standard solution. User can choose anyone fromtwoseries ofstandardsolutions: Europe &USAseries andCHINAseries.

1.8.Automatically selectconductivity measuring range, the meterwill dononlinearity temperature compensationtest for purified andhigh purifiedwater less than 10uS/cm,which greatly improve the measuringaccuracy. It is especially suitable foruse in fields of electric power, microelectronics and medicine.

1.9.Equips new type of DO electrode with temperature and salinity sensor which hasfunction of automatic temperature compensation and automatic salinity compensationas well as manual Atmosphericpressure compensation insidemeter, easy to use, accurate to measure.

1.10. PProgramtype DO electrode has special electrode calibration cap. Only needs 3 to 5 minutes for electrode polarization. Electrodeadopts combinationdiaphragmcap which very convenient to use.EachDOelectrodeequipswith three spare diaphragms caps.

1.11. Meters circuit board adopts SMT filmcovering technology to improve meters production reliability.

1.12. Meter has the back light LCD display monitor.

1.13. Dustproof and waterproof meter meets IP57 rating.