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Additional information on pH and ORP (MP-6 and MP-6p models)

D.1.5 Temperature compensation

pH sensor glass changes sensitivity slightly with temperature. When the solution is

further from pH 7, this effect increases. For example, a pH of 11 at 40 ºC is off by

0.2 units. The MP series meter senses the sensor cup temperature and

compensates the reading.

D.2 Oxidation Reduction Potential/Redox (ORP)

D.2.1 ORP as an indicator

ORP measures the ratio of oxidizing activity to reducing activity in a solution. It is

the potential of a solution to give up electrons (to oxidize other things) or gain

electrons (reduce).

Similar to acidity and alkalinity, one aspect increases at the expense of the other.

Therefore, a single voltage is called the Oxidation-Reduction Potential, and a

positive voltage shows a solution that wants to steal electrons (an oxidizing agent).

For example, chlorinated water shows a positive ORP value.

D.2.2 ORP units

ORP is measured in millivolts, with no correction for solution temperature. Like pH,

it is not a measurement of concentration directly, but of activity level. In a solution of

only one active component, ORP indicates concentration. Also, similar to pH, a very

dilute solution takes time to accumulate a readable charge.

D.2.3 ORP sensor

An ORP sensor uses a small platinum surface to accumulate charge without

reacting chemically. That charge is measured relative to the solution, so the

solution “ground” voltage comes from a reference junction.

Figure 10

shows the

platinum button in a glass sleeve. The same reference is used for both the pH and

the ORP sensors. Both pH and ORP indicates 0 for a neutral solution. Calibration at

zero corrects the error in the reference junction.

A zero calibration solution for ORP is not practical, so the MP series meters use the

offset value determined during calibration to 7 in pH calibration (pH 7 = 0 mV).

Sensitivity of the ORP surface is fixed so there is no gain adjustment.

D.2.4 Sources of error

Sources of error are similar to pH. Even though the platinum surface does not

break like the glass pH surface, its protective glass sleeve can be broken. A surface

film will slow the response time and diminish sensitivity.

Содержание MP-4

Страница 2: ...2 ...

Страница 3: ...6 and MP 6p models 18 3 10 Measure pH MP 6 and MP 6p models 18 3 11 Select a solution 19 3 11 1 Temperature compensation 19 3 12 Change the user selected temperature compensation factor 20 3 12 1 Disable temperature compensation 20 3 13 Change the user selected conductivity TDS ratio 20 3 14 Settings 21 3 14 1 Store a value in the memory 21 3 14 2 View the memory recall 22 3 14 3 Clear all records...

Страница 4: ...resistivity TDS sensor 38 5 4 2 Clean the pH ORP sensor 39 Section 6 Troubleshooting 41 Section 7 Contact Information 43 Section 8 Replacement parts and accessories 45 8 1 Replacement parts 45 8 2 Accessories 45 8 3 Consumables 45 8 4 Recommended cleaning consumables 46 Section 9 Limited Warranty 47 Appendix A Temperature compensation 49 A 1 Compensation to 25 ºC 49 A 2 Changes in temperature comp...

Страница 5: ...models 55 D 1 pH 55 D 1 1 pH as an indicator 55 D 1 2 pH units 55 D 1 3 pH sensor 55 D 1 4 Sources of error 56 D 1 5 Temperature compensation 57 D 2 Oxidation Reduction Potential Redox ORP 57 D 2 1 ORP as an indicator 57 D 2 2 ORP units 57 D 2 3 ORP sensor 57 D 2 4 Sources of error 57 ...

Страница 6: ...Table of contents 6 ...

Страница 7: ...s 5000 readings Operating Storage Temperature 0 to 55 ºC 32 to 132 ºF Protection Ratings IP67 NEMA 6 Warranty MP Series Meter Warranty Two years from date of shipment see Section 9 on page 47 pH ORP Sensor Warranty Six months from date of shipment see Section 9 on page 47 Ranges pH MP 6 and MP 6p models 0 to 14 pH ORP MP 6 and MP 6p models 999 mV Conductivity 0 to 9999 µS cm 10 to 200 mS cm in 5 a...

Страница 8: ... 1 1 MΩ Temperature 0 1 ºC ºF Accuracy pH 0 01 pH2 ORP 1 mV Conductivity 1 of reading TDS 1 of reading Mineral salt 1 of reading Resistivity 1 of reading Temperature 0 1 ºC Auto temperature compensation pH 0 to 71 ºC 32 to 160 ºF Conductivity 0 to 71 ºC 32 to 160 ºF TDS 0 to 71 ºC 32 to 160 ºF Mineral Salt 0 to 71 ºC 32 to 160 ºF Resistivity 0 to 71 ºC 32 to 160 ºF Adjustable temperature compensat...

Страница 9: ...Conductivity KCl NaCl 442 3 TDS Mineral salt Adjustable COND TDS ratio factor Conductivity 0 20 to 7 99 TDS Mineral salt 1 Trademark of SABIC Innovative Plastics IP BV 2 0 2 pH in presence of RF fields 3 V m and 300 MHz 3 Trademark of Myron L Company ...

Страница 10: ...Specifications 10 ...

Страница 11: ...ormation 2 1 2 Precautionary labels DANGER Indicates a potentially or imminently hazardous situation which if not avoided will result in death or serious injury WA RN IN G Indicates a potentially or imminently hazardous situation which if not avoided could result in death or serious injury CAUTION Indicates a potentially hazardous situation which if not avoided could result in minor or moderate in...

Страница 12: ...y mineral salt concentration TDS and temperature The mineral salt measurement is a TDS value based on an NaCl profile MP 6 Measures pH ORP conductivity resistivity TDS and temperature 2 2 2 Features common to all models 2 2 3 User mode features 4 digit LCD User adjustable conductivity TDS conversion ratio IP67 rating Accuracy of 1 of reading or better Internal electrode sensors for maximum protect...

Страница 13: ... Figure 1 Model MP 6 conductivity and pH ORP sensor cups 1 Temperature sensor 5 pH glass electrode 2 Conductivity cup built in electrodes 6 Reference junction under glass pH bulb 3 ORP electrode 7 pH ORP sensor protective cap 4 pH ORP sensor cup replaceable sensor ...

Страница 14: ...General information 14 Figure 2 Model MP 6 1 Conductivity cup 4 Display 2 pH ORP sensor cup 5 Keypad 3 pH ORP sensor protective cap 6 Wrist strap slot customer supplied ...

Страница 15: ...lues user mode memory recall memory store calibration date and time Figure 3 Figure 3 Model MP 6 display 1 Test value Shows the test value 2 Units of measurement Shows the units of measurements 3 Parameters Shows the parameters being measured 4 Multiple value readout Shows the temperature value readout user temperature compensation or conductivity TDS ratio Memory record location numbers or pH cal...

Страница 16: ...Operation 16 3 3 Keypad description The MP 6 meter is used as an example for keypad description and function Figure 4 Keypads on MP Series meters ...

Страница 17: ...up to ensure that the air bubbles do not cling to the cell wall 3 6 Measure resistivity MP 4 and MP 6 models Resistivity is measured in low conductivity solutions In the conductivity cup the value can drift due to trace contaminants or absorption from atmospheric gasses Therefore measuring a flowing sample is recommended 1 Make sure the pH ORP sensor protective cap is secure to avoid contamination...

Страница 18: ... cell 2 Fill the conductivity cup with the solution 3 Push the TDS key 4 Observe or record the value displayed or push UP MS to store the reading 3 9 Measure ORP Redox MP 6 and MP 6p models To measure the ORP Redox 1 Remove the protective pH ORP sensor cap Squeeze the sides and pull up 2 Rinse the sensor cup three times with the sample to be measured 3 Shake the meter after each rinse to remove re...

Страница 19: ...g TDS Check the display to see if the solution profile displayed is the solution type desired for that measurement To change a solution 1 Push the COND key the RES key the MIN SALT key or the TDS key to select the parameter to change the solution type 2 Push and hold the CAL MCLR key for three seconds and wait for SEL to appear in the display 3 Push UP MS or MR DOWN to scroll to the desired soluti...

Страница 20: ...S or MIN SALT mode 5 Measure samples with the new temperature compensation factor 3 12 1 Disable temperature compensation 1 Select the User mode see section 3 11 on page 19 2 Push the CAL MCLR key Hold the MR DOWN key until the temperature compensation shows 00 ºC 3 Push the CAL MCLR key twice three times for TDS or MIN SALT 4 Temperature compensation is now disabled 0 for measurements in the User...

Страница 21: ...5 Push the CAL MCLR key twice to skip over calibration adjustment to accept the new conversion ratio 6 Use the new conductivity TDS ratio to measure samples 3 14 Settings 3 14 1 Store a value in the memory The MP series handheld meters have memory storage for up to 100 readings Time and date is recorded with each stored reading To download this stored data to a computer see section 3 21 on page 29...

Страница 22: ...hold the CAL MCLR key to clear that memory location This memory location is used for the next stored memory record unless the user scrolls to another empty memory position before the recall sequence ends 3 14 3 Clear all records To clear all records in the memory 1 Push the MR DOWN key 2 Scroll down until CLR ALL is displayed 3 Push the CAL MCLR key This clears all records 3 15 Time and date Chang...

Страница 23: ...o dy yr 1 Push any measurement key To quickly scroll through all stored memory records hold down the MR DOWN key 2 Push the MR DOWN key repeatedly until the date shows in the display For example 01 05 05 January 5 2005 3 Push the CAL MCLR key to begin The CAL icon displays above the year 4 Push UP MS or MR DOWN to change the year 5 Push CAL MCLR to accept the new setting for the year 6 Push UP MS ...

Страница 24: ...y repeatedly until US or Int displays To quickly scroll through all stored memory records hold down the MR DOWN key 3 Push CAL MCLR to change the date format The new format is now displayed 3 16 Temperature format To set the temperature format 1 Push any measurement key 2 Push the MR DOWN key repeatedly until C or F is displayed To quickly scroll through all stored memory records hold down the MR ...

Страница 25: ...the CAL MCLR key to accept the factory reset The meter returns to the measurement mode 3 18 Cell check The cell check verifies the cleanliness of the conductivity TDS resistivity sensor If the display shows 00 when the cell cup is dry the sensor is probably clean In normal use the conductivity cell may become dirty or coated and require cleaning To perform a cell check 1 Push the COND key 2 Push t...

Страница 26: ...is 15 seconds and 60 seconds in the CAL calibration mode This time may be adjusted up to 75 seconds 1 Push any measurement key 2 Push the MR DOWN key repeatedly until the display shows Auto oFF To quickly scroll through all stored memory records hold down MR DOWN 3 Push the CAL MCLR key to begin The CAL icon displays above the 15 SEC display ...

Страница 27: ...nc applies to all measurement modes using the User solution selection 3 20 1 Calibrate meter for User mode To calibrate the meter for the User mode 1 Push the COND key the MIN SALT key or the TDS key 2 Calibrate the meter using a standard solution see section 4 4 on page 31 3 Select the User mode see section 3 11 on page 19 4 Set the calibration Linc 3 20 2 Set User mode calibration Linc The Linc ...

Страница 28: ...ant 6 Push the CAL MCLR key to accept the setting The User mode now uses the calibration offset constant that was created here Note To exit without changing the setting push any measurement key 3 20 3 Cancel User mode calibration Linc To cancel the User mode calibration Linc Note The MP series meter must be in User linked mode to cancel the Linc 1 Push a linked measurement key such as COND RES MIN...

Страница 29: ...hrough the USB port and requires no external power source The data is transferred through the Infrared IR data port on the bottom of the MP meter Figure 6 to the MP Dock and then to the PC The MP Datalink software which is included with the MP Dock operates on Windows 2000 and XP and Macintosh OS9 2 and OSX based operating systems For the latest instructions on communication port selection and dat...

Страница 30: ...Operation 30 ...

Страница 31: ...ct standard solution a very dirty cell cup or an aging pH ORP sensor 4 3 Calibration records To minimize calibration efforts keep records If the calibration adjustments are minimal calibration can occur less often Record the following information Record changes in conductivity in percentages Record changes in pH calibration in pH units Conductivity cell calibration is purposely limited to 10 Chang...

Страница 32: ...ub inside the conductivity cell 3 Rinse the conductivity cup with pure water after taking measurements 4 Rinse the conductivity cup three times with the standard solution to be used for calibration KCl NaCl or 442 Note Failure to rinse can cause crystals to form in the cup and contaminate future samples 5 Fill the conductivity cup with same standard 6 Push the COND key the MIN SALT key or the TDS ...

Страница 33: ...LT key or the TDS key 2 Push the CAL MCLR key twice in COND or three times in TDS Note In the User mode push the CAL MCLR key twice in the COND mode and three times in the TDS mode or the MIN SALT mode This bypasses temperature correction and ratio adjustments 3 Push the UP MS key until the FAC icon appears 4 Push the CAL MCLR key to accept the factory calibration setting 5 If another solution nee...

Страница 34: ...ultiple point pH calibration see section 4 10 If the user does not wish to continue push any measurement key to exit 4 10 Set multiple point pH calibrations Important Note Acid or base solution can be used for the second point calibration and then use the other solution for the third point To verify that a buffer is in the sensor cup the display shows either the Acd icon or the bAS icon Note If th...

Страница 35: ...e Note Fill the pH ORP sensor cup with pH storage solution and replace the protective sensor cap when the meter is not in use Do not allow the cup to dry 4 11 ORP calibration The ORP electrodes rarely give false readings unless there is a problem in the reference electrode For this reason and because the calibration solutions for ORP are highly reactive and potentially hazardous the MP meter has a...

Страница 36: ...Calibration 36 ...

Страница 37: ...ject the meter to temperatures in excess of 66 ºC 150 ºF and void the warranty 5 2 Battery replacement Perform the following steps to replace the battery 1 Dry the meter completely 2 Remove the four screws from the base of the meter 3 Open the meter carefully 4 Take care to detach the battery from the circuit board 5 Replace the battery with a new 9V alkaline battery 6 Replace the bottom housing e...

Страница 38: ...structions are included with each replacement sensor Tools required include a 2 Phillips screwdriver and 1 4 inch wrench Note When the pH ORP sensor is replaced it is also a good time to replace the battery 5 4 Clean the sensors Perform these procedures to clean the various sensors 5 4 1 Clean the conductivity resistivity TDS sensor Keep the conductivity cell cup Figure 7 as clean as possible Note...

Страница 39: ...pe the pH ORP sensor 3 Follow the hot solution method described below a Pour a hot salt solution 60 ºC 140 ºF such as pH storage solution in the sensor cup b Allow the liquid to cool c Retest 4 If the hot solution method does not work follow the Deionized DI water method below a Pour DI water into the sensor cup Figure 7 Model MP 6 sensor cups 1 Temperature sensor 5 pH glass electrode 2 Conductivi...

Страница 40: ...ectrode cleaning solution may also be used less frequently 2 Pour any of these solutions in the cell cup and allow it to soak for no more than five minutes 3 Use a cotton swab to gently clean the electrodes 4 Rinse out the cleaning solution 5 Fill the sensor cup with Hach pH storage solution before the pH ORP sensor cap is replaced 5 4 2 2 Solutions that damage the pH ORP sensor Samples that conta...

Страница 41: ...sensor see section 5 3 on page 38 pH readings drift or respond slowly to change or FAC displays repeatedly Temporary condition due to memory of solution in pH sensor cup for long periods Clean and restore the sensor see section 5 4 on page 38 and recalibrate If there is no improvement replace the pH ORP sensor refer to section 5 3 on page 38 Bulb dirty or dried out Reference junction clogged or co...

Страница 42: ...Troubleshooting 42 ...

Страница 43: ... www hach lange co uk HACH LANGE LTD Unit 1 Chestnut Road Western Industrial Estate IRL Dublin 12 Tel 353 0 1 46 02 5 22 Fax 353 0 1 4 50 93 37 info hach lange ie www hach lange ie HACH LANGE GMBH Hütteldorferstr 299 Top 6 A 1140 Wien Tel 43 0 1 9 12 16 92 Fax 43 0 1 9 12 16 92 99 info hach lange at www hach lange at DR BRUNO LANGE AG Juchstrasse 1 CH 8604 Hegnau Tel 41 0 44 9 45 66 10 Fax 41 0 44...

Страница 44: ...7784 info hach lange hu www hach lange hu HACH LANGE S R L Str Leonida nr 13 Sector 2 RO 020555 Bucuresti Tel 40 0 21 201 92 43 Fax 40 0 21 201 92 43 info hach lange ro www hach lange ro HACH LANGE 8 Kr Sarafov str BG 1164 Sofia Tel 359 0 2 963 44 54 Fax 359 0 2 866 04 47 info hach lange bg www hach lange bg HACH LANGE SU ANALÝZ SÝSTEMLERÝ LTD ÞTÝ Hilal Mah 75 Sokak Arman Plaza No 9 A TR 06550 Çan...

Страница 45: ...lution pH 7 00 4 L 2283556 Buffer solution pH 7 00 20 L 2283561 Buffer solution pH 10 01 50 mL 2283626 Buffer solution pH 10 01 500 mL 2283649 Buffer solution pH 10 01 4 L 2283656 Buffer solution pH 10 01 20 L 2283661 pH electrode storage solution 500 mL 500 mL 2756549 pH electrode storage solution 50 mL 50 mL 2756526 0 001M KCl Conductivity Standard Solution 148 µS cm 500 mL 2974249 0 001M KCl Co...

Страница 46: ...d Solution 500 mL 2971849 100 µS cm NaCl Conductivity Standard Solution 50 mL 2971826 1000 µS cm NaCl Conductivity Standard Solution 500 mL 1440049 1000 µS cm NaCl Conductivity Standard Solution 50 mL 1440026 10 000 µS cm NaCl Conductivity Standard Solution 500 mL 2972249 10 000 µS cm NaCl Conductivity Standard Solution 50 mL 2972226 18 00 mS cm NaCl Conductivity Standard Solution 500 mL 2307449 1...

Страница 47: ...used by any repair or attempted repair not authorized by Hach Company Any product not used in accordance with the instructions furnished by Hach Company Freight charges to return merchandise to Hach Company Freight charges on expedited or express shipment of warranted parts or product Travel fees associated with on site warranty repair This warranty contains the sole express warranty made by Hach ...

Страница 48: ...Limited Warranty 48 ...

Страница 49: ...ensation to 25 ºC Temperature compensation can be set to KCl NaCl or 442 solutions or tailored for special measurements or applications A 2 Changes in temperature compensation Most conductivity meters approximate the temperature characteristics of solutions and assume a constant value such as 2 ºC In fact KCl temperature compensation changes with concentration and temperature in a non linear fashi...

Страница 50: ...2 values or stay close to 25 ºC A 4 Other solutions A salt solution like sea water or liquid fertilizer acts like NaCl The NaCl solution compensation provides the greatest accuracy for these solutions Many solutions differ greatly from KCl NaCl or 442 A sugar solution a silicate or a calcium salt at a high or low temperature may require a User value to provide readings close to the true compensate...

Страница 51: ...blem industry applications tend to use the characteristics of a standard material as a model for their solution such as KCl which is favored by chemists for its stability Users who deal with sea water etc use NaCl as the model for their concentration calculations Users who deal with freshwater work with mixtures including sulfates carbonates and chlorides These are modeled in the 442 standard solu...

Страница 52: ...Conductivity conversion 52 ...

Страница 53: ...and concentration This is why the MP meters feature mathematically generated models for known salt characteristics that also vary with concentration and temperature C 2 Temperature compensation of unknown solutions The user may need to find the corrected conductivity of a solution that differs from the three standard salts In order to enter a custom fixed temperature compensation for a limited mea...

Страница 54: ... ratio of unknown solutions When the effect of temperature is removed the compensated conductivity varies with the concentration TDS The ratio of TDS to compensated conductivity for any solution also varies with concentration The ratio is set during calibration in the User mode see section 3 13 on page 20 Measure the TDS of an unknown solution by evaporation and weighing Then measure the conductiv...

Страница 55: ...concentration of 10 9 mol liter of H has 100 times less H ions than OH ions and is an alkaline solution of pH 9 D 1 3 pH sensor The active part of a pH sensor is a thin glass surface that is selectively receptive to hydrogen ions Available hydrogen ions in a solution accumulate on this surface and a charge builds up across the glass interface The voltage can be measured with a high impedance voltm...

Страница 56: ... in the zero setting at pH 7 This explains why MP series meter does not allow more than one pH unit of offset during calibration D 1 4 2 Sensitivity errors Sensitivity is the receptiveness of the glass surface A film on the surface can diminish the sensitivity and cause a long response time Figure 10 pH ORP sensor construction 1 Glass surface 5 KCl solution 2 H ions 6 Glass 3 Junction plug 7 Elect...

Страница 57: ...ion temperature Like pH it is not a measurement of concentration directly but of activity level In a solution of only one active component ORP indicates concentration Also similar to pH a very dilute solution takes time to accumulate a readable charge D 2 3 ORP sensor An ORP sensor uses a small platinum surface to accumulate charge without reacting chemically That charge is measured relative to th...

Страница 58: ...Additional information on pH and ORP MP 6 and MP 6p models 58 ...

Страница 59: ... and pH ORP sensor cups 13 conductivity characteristics 53 conductivity conversion 51 conductivity cup clean the cup 38 consumables 45 D data port 29 default settings 25 description of the display 15 disable temperature compensation 20 download data 29 drifting test results 40 E exit calibration mode 32 extreme temperatures 37 F features common to all models 12 find temperature compensation by adj...

Страница 60: ...de calibration Linc 27 solution characteristics 51 solution types 19 solutions that damage the pH ORP sensor 40 specifications 7 store a value in the memory 21 T take a measurement 17 TDS ratio of unknown solutions 54 temperature compensation compensation to 25ºC 49 temperature compensation and TDS derivation 53 temperature compensation of unknown solutions 53 temperature extremes 37 temperature f...

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