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TPS pH Cube, Руководство пользователя

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TPS pH Cube Скачать руководство пользователя страница 15

 

Page 15 

7.2.3

 

Temperature Compensation 

The slope of a pH sensor (section 7.2.2) is affected by temperature. This effect is 
compensated  for  either  by  using  an  Automatic  Temperature  Compensation 
(ATC) sensor or by entering the sample temperature manually. Figure 7-3 shows 
the slope of a pH sensor at various temperatures. 

-600

-400

-200

0

200

400

600

0

7

14

Electrode
Potential (mV) at
0 oC (54mV/pH)

Electrode
Potential (mV) at
50 oC (64mV/pH)

Electrode
Potential (mV) at
100 oC (74mV/pH)

pH Electrode Response, as a Function of Temperature

E

le

c

tr

o

d

e

 R

e

s

p

o

n

s

e

 (

m

V

)

pH

 

Figure 7-3 

Содержание pH Cube

Страница 1: ...tion has a diagram and explanation of the display and controls of the pH Cube It also contains a full listing of all of the items that you should have received with your pH Cube Please take the time to read this section as it explains some of items that are mentioned in subsequent sections 3 Main Section The main section of the handbook provides complete details of the pH Cube including operating ...

Страница 2: ...ibration 7 3 1 Calibration Procedure 7 3 2 Calibration Notes 8 4 ORP mV Calibration 8 5 Temperature Calibration 9 5 1 Calibration Procedure 9 5 2 Calibration Notes 9 5 3 Manual Temperature Setting 9 6 Troubleshooting 10 6 1 pH and ORP mV Troubleshooting 10 6 2 Temperature Troubleshooting 11 7 Appendices 12 7 1 pH Buffer Values Vs Temperature 12 7 2 pH Sensor Fundamentals 13 8 Warranty 16 ...

Страница 3: ...e Control Used for pH asymmetry calibration in pH7 00 or pH6 86 buffer See section 3 Slope Control Used for pH slope calibration in a buffer that is at least 2 to 3 pH away from pH7 00 eg pH4 01 pH9 18 or pH10 01 See section 3 Manual Temp Control Used to manually set the temperature of the solution for pH temperature compensation Only active when temperature sensor is unplugged See section 5 3 ...

Страница 4: ...connected to the pH mV Connector Temp Connector Used to connect Temperature sensor This sensor provides temperature readout as well as Automatic Temperature Compensation for pH readings Temp Cal Control Used for temperature calibration See section 5 12V DC Power Connector Used to connect 12V AC DC Adaptor The pH Cube can run off any 12V DC source with at least 200mA output The 12V DC connector has...

Страница 5: ...nsor 7 AC DC Power Adaptor 130044 8 pH Cube Handbook 130050 1 4 Specifications Ranges Resolution Accuracy pH 0 to 14 00 pH 0 01 pH 0 01 pH ORP mV 0 to 1999 mV 1 mV 1 mV Temperature 10 0 to 120 0 O C 0 1 O C 0 2 O C Input Impedance 3 x 1012 Asymmetry Range Approx 1 00 to 1 00 pH Slope Range Approx 85 0 to 105 0 Temperature Compensation Automatic 0 to 100 0 o C Manual 5 to 100 o C Power 12V DC by AC...

Страница 6: ...perating Modes Switch the function switch to any one of the following three operating modes Note the mode enunciator P for pH E for EMF ORP mV and C for O C Function Switch Position Display example pH ORP mV Temp ...

Страница 7: ...ready been calibrated or manually set see sections 5 1 and 5 3 4 Remove the wetting cap from the pH sensor 5 Rinse the pH and Temperature sensors in distilled water and blot them dry 6 Place both sensors into a small sample of primary buffer that is at or near pH7 eg pH7 00 or pH6 86 The bulb and reference junction should both be covered as per the diagram below DO NOT place the sensors directly i...

Страница 8: ...n the reading has stabilised adjust the Slope control until the display shows the value of the buffer at the current temperature For TPS buffers this is shown on the bottle Refer also to the table in section 7 1 10 The pH Cube is now calibrated and is ready for use Discard the used samples of buffer 3 2 Calibration Notes 1 A 1 point calibration using the Calibrate control in a pH7 00 or pH6 86 buf...

Страница 9: ...ker 4 When the reading has stabilised adjust the Temp Cal control until the display shows the same temperature as the mercury thermometer 5 The Temperature function of the pH Cube is now calibrated and is ready for use 5 2 Calibration Notes 1 Temperature does not need to be recalibrated unless the Temperature sensor is replaced 5 3 Manual Temperature Setting Manual temperature setting is only avai...

Страница 10: ... sensor Slope calibration with Slope control in low or high buffer fails Slope is less than 85 0 1 Glass bulb not clean 2 Sensor is aged 3 Connector is damp 4 Buffers are inaccurate Clean glass bulb as per instructions supplied with the sensor Attempt rejuvenation as per instructions supplied with the sensor If not successful replace sensor Dry in a warm place Replace buffers Inaccurate readings e...

Страница 11: ...ater until dissolved 6 2 Temperature Troubleshooting Symptom Possible Causes Remedy Meter reads 1 in Temperature mode Temperature sensor is connected but is faulty Check the temperature sensor connector and replace if necessary Replace temperature sensor part no 121245 if problem persists Temperature readings do not vary and Manual Temp control is active when temperature sensor is plugged in 1 Fau...

Страница 12: ...t solution temperature Buffer temperature should not exceed 50oC during calibration Temp O C pH4 01 pH6 86 pH7 00 pH9 18 pH10 01 0 4 00 6 98 7 13 9 46 10 32 5 4 00 6 95 7 09 9 40 10 25 10 4 00 6 92 7 06 9 33 10 18 15 4 00 6 90 7 04 9 28 10 12 20 4 00 6 88 7 02 9 23 10 06 25 4 01 6 86 7 00 9 18 10 01 30 4 01 6 85 6 99 9 14 9 97 35 4 02 6 84 6 98 9 10 9 93 40 4 03 6 84 6 97 9 07 9 89 45 4 04 6 83 6 ...

Страница 13: ...junction A saturated solution of KCl is used to make contact with the sample It is vital that the KCl solution has an adequate flow rate in order to obtain stable accurate pH measurements 7 2 1 Asymmetry of a pH Sensor An ideal pH sensor produces 0 mV output at 7 00 pH In practice pH sensors generally produce 0 mV output at slightly above or below 7 00 pH The amount of variance from 7 00 pH is cal...

Страница 14: ...practice pH sensors usually produce slightly less than this The output of a pH sensor is expressed as a percentage of an ideal sensor For example an ideal sensor that produces 59mV pH unit has 100 Slope An sensor that produces 50 15mV pH unit has 85 Slope see Figure 7 2 600 400 200 0 200 400 600 0 7 14 85 Slope at 25 oC 50 15mV pH 100 Slope at 25 oC 59mV pH Response of pH Electrode as a Function o...

Страница 15: ... Compensation ATC sensor or by entering the sample temperature manually Figure 7 3 shows the slope of a pH sensor at various temperatures 600 400 200 0 200 400 600 0 7 14 Electrode Potential mV at 0 oC 54mV pH Electrode Potential mV at 50 oC 64mV pH Electrode Potential mV at 100 oC 74mV pH pH Electrode Response as a Function of Temperature Electrode Response mV pH Figure 7 3 ...

Страница 16: ...ipment incorrect calibration incorrect operation or from interpretation of information derived from the equipment Specifications are subject to change without notice This warranty becomes invalid if modifications or repairs are carried out on this unit by unauthorised persons There are no express or implied warranties which extend beyond the face hereof Procedure for Service Please read service de...

Страница 17: ...r equipment will be repaired and returned to you by express air freight where possible For instruments beyond warranty period a repair cost will be calculated from parts and labour costs and emailed to you If you decline to have the equipment repaired the complete instrument will be returned to you freight paid not serviced TPS Pty Ltd has only one service location which is located at our factory ...

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