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Page 24

11.1.3

Temperature Compensation

The slope of a pH sensor (section 11.1.2) 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 11-3
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 11-3

11.2 Polarisation Output Connector

The polarisation output connector on the rear panel is for Karl Fischer titrations.
This titration is a method for determining minute quantities of water in non-
aqueous liquids.

The TPS Double Platinum electrode (part no 122207) has two connectors. The
larger BNC connector fits to the

Sensor

socket and the smaller 3.5mm phono

plug fits to the

Polarisation

socket.

DO NOT PLUG THE DOUBLE PLATINUM ELECTRODE INTO THE
TEMPERATURE SOCKET.

When performing Karl Fischer titrations, ensure that the

901-PH

is in mV mode.

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Содержание 901-PH

Страница 1: ...ion has a diagram and explanation of the display and controls of the 901 PH It also contains a full listing of all of the items that you should have received with your 901 PH 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 901 PH including operating mode...

Страница 2: ... the Baud Rate 13 6 2 Sending Readings to the RS232 Port 13 6 3 RS232 Configuration 14 6 4 Communication and Statistical Software 14 6 5 Commands 14 6 6 Data Format 15 7 Recorder Output Option 16 7 1 RS232 Recorder Output Socket Connections 16 8 Selecting Buffers for Automatic Buffer Recognition 17 9 Initialising the 901 PH 18 10 Troubleshooting 19 10 1 General Error Messages 19 10 2 pH and mV Tro...

Страница 3: ...Page 2 1 Introduction 1 1 901 PH Display and Controls 1 2 901 PH Rear Panel Connectors ...

Страница 4: ...ure See sections 3 and 5 Also used to select buffers for automatic buffer recognition See section 8 and Keys Used for temperature calibration See section 5 Used for setting the manual temperature compensation value if the temperature sensor is unplugged See section 5 4 Press to recall asymmetry value from the last successful pH calibration Press to recall slope value from the last successful pH ca...

Страница 5: ...mL 121306 5 pH4 00 Buffer 200mL 121381 6 AC DC Power Adaptor 130044 7 901 PH Handbook 130050 Options that may have been ordered with your 901 PH 1 Solution Guard Rod 121360 2 Double Platinum Electrode for Karl Fischer 122207 Titrations 3 Flexible arm type sensor holder 130088 4 RS232 option includes cable 130029 5 RS232 Communication software for Windows 130086 6 Recorder output option includes ca...

Страница 6: ...5 0 to 105 0 Temperature Compensation 0 to 100 0 o C automatic or manual Recorder Output pH 0 to 14 00 pH for 0 to 2000 mV i e pH7 00 1000 mV mV 1500 to 1500 mV for 0 to 2000 mV i e 0 mV 1000 mV Temp 10 0 to 120 0 O C for 0 to 2000 mV i e 0 0 O C 152 mV Output impedance approx 1000 Ohms Power 12V DC by AC DC power adaptor Dimensions 270 x 210 x 75 mm Mass Instrument only Approx 1 0 kg Full Kit App...

Страница 7: ... 0 500 0mV 25 0o o c c Temperature Mode 25 0 25 0o o c c Back to pH Mode If the 901 PH IS fitted with the RS232 option press the key to roll through the five operating modes as follows pH Mode 7 00pH 25 0 7 00pH 25 0o o c c mV Mode 500 0mV 25 0 500 0mV 25 0o o c c Temperature Mode 25 0 25 0o o c c RS232 Send Rate Send Rate Send Rate 0 0 RS232 Baud Rate Baud Rate Baud Rate 9600 9600 Back to pH Mode...

Страница 8: ...temperature readout indicates that temperature is not calibrated 4 Ensure that the primary and secondary buffers to be used have been correctly selected for automatic buffer recognition See section 8 5 Remove the wetting cap from the pH sensor 6 Rinse the pH and Temperature sensors in distilled water and blot them dry 7 Place both sensors into a small sample of primary buffer pH6 88 or pH7 00 so t...

Страница 9: ...se buffers if possible Discard immediately after use When the reading has stabilised press the key to calibrate The in the pH reading will now be replaced by a decimal point if calibration was successful 11 The 901 PH is now calibrated and is ready for use Discard the used samples of buffer 3 2 Calibration Notes 1 A 1 point calibration should be performed at least weekly In applications where the ...

Страница 10: ...e decimal point in the pH reading is replaced by a to indicate that pH is not correctly calibrated 3 If a 2 point calibration has been successfully performed the 901 PH will display the asymmetry and slope of the sensor and then go back to pH mode For example 2 Point Cal OK 2 Point Cal OK then Asym 0 10pH Asym 0 10pH then Slope 99 0 Slope 99 0 Note that in the pH reading has now been replaced by a...

Страница 11: ...emperature sensor Part No 121245 into the Temp socket 3 Place the sensor alongside a good quality mercury thermometer into a beaker of room temperature water Stir the sensor and the thermometer gently to ensure an even temperature throughout the beaker 4 When the reading has stabilised press the key 5 The 901 PH now enters temperature calibration For example Enter True Temp Enter True Temp then 26...

Страница 12: ...he offset value of the sensor and then return to Temperature mode For example Temp Cal OK Temp Cal OK then Offset 1 0 Offset 1 0o o c c The is replaced by a decimal point in the Temperature reading to indicate that Temperature is correctly calibrated 2 If a temperature calibration has failed the 901 PH will display the failed offset value of the sensor before returning to Temperature mode For exam...

Страница 13: ...5 0 7 00pH 25 0O O cm cm 1 Switch the 901 PH on and select Temperature mode see section 2 2 Measure the temperature of the sample solution 3 Press the key 4 The 901 PH now enters manual temperature setting For example Man Temp Man Temp 25 0 25 0 5 Press the and keys until the display shows the temperature of sample solution 6 Press the key to save the manual temperature setting Alternatively press...

Страница 14: ... printer or PC with which the 901 PH is communicating 3 Press the key to return to pH mV or Temperature mode as required 6 2 Sending Readings to the RS232 Port The 901 PH can send readings to the RS232 port at a pre set rate To set this Send Rate 1 Select RS232 Send rate mode see section 2 2 The currently selected Send rate is displayed For example Send Rate Send Rate 0 0 Press the key to increase...

Страница 15: ...number 130086 Once the data is saved to disk the next problem is how to use it The data sent by the 901 PH is formatted in columns that can be imported by programs such as Microsoft Excel and Lotus 123 Information on how to use the software is provided in the README files on the diskette 6 5 Commands The following command can be sent from a PC to the 901 PH Note that cr denotes carriage return and...

Страница 16: ...not calibrated UU is the unit description either pH or mV left justified ss ss is two spaces TTTTTT is the Temperature data Maximum 6 characters right justified A is sent instead of the decimal point if the reading is not calibrated oCm is the Temperature unit description left justified oC is sent for real temperature data oCm is sent for manual temperature compensation data Notes 1 Data correspon...

Страница 17: ...llows pH 0 to 14 00 pH for 0 to 2000 mV i e pH7 00 1000 mV Output mV 1500 to 1500 mV for 0 to 2000 mV i e 0 mV Reading 1000 mV Output Temperature 10 0 to 120 0 O C for 0 to 2000 mV i e 0 0 O C 152 mV Output Output impedance approx 1000 Ohms 7 1 RS232 Recorder Output Socket Connections Pin No Connection 1 Chassis 2 Receive RS232 Data 3 Transmit RS232 Data 4 10 V DC Power Output 5 Ground 6 Recorder ...

Страница 18: ...en the desired primary buffer has been selected The display will now show the currently selected high buffer For example Buffer 2 Select Buffer 2 Select then Buffer 2 9 23pH Buffer 2 9 23pH Press the or keys to alternate between pH9 23 and pH10 01 buffers The display shows 10 0 for the latter but this buffer is stored in memory as 10 01 4 Press the key to exit when the desired high buffer has been...

Страница 19: ... R1234 901PHs V5 R1234 The s s after 901PH 901PH is shown when the optional RS232 port is fitted 4 The 901 PH now goes on to pH mode Note that a replaces each of the decimal points in the pH and Temperature readings indicating that the unit requires calibration Note When the 901 PH is initialised automatic buffer recognition is re set to pH4 00 pH6 88 and pH9 23 See section 8 if you wish to select...

Страница 20: ... 10 seconds and try switching on again If message persists then the unit must be returned to TPS for service EEPROM WriteFail EEPROM WriteFail then Contact Factory Contact Factory displayed at calibration or set up Storage of user calibration settings to the EEPROM has failed Switch the 901 PH off wait 10 seconds and then switch the unit on again Attempt calibration setup again If message persists...

Страница 21: ...ctrolyte 2 Point calibration fails Slope is less than 85 0 1 Buffer set incorrectly 2 Glass bulb not clean 3 Sensor is aged 4 Connector is damp 5 Buffers are inaccurate Ensure that you are using buffers that match the selected buffer set See section 8 Clean glass bulb as per instructions supplied with the sensor Attempt rejuvenation as per instructions supplied with the sensor If not successful re...

Страница 22: ...fully immersed Rinse electrolyte chamber with warm distilled water until dissolved Replace electrolyte 10 3 Temperature Troubleshooting Symptom Possible Causes Remedy Meter reads OverR OverR 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 Meter displays Te...

Страница 23: ...ence 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 11 1 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 ...

Страница 24: ...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 11 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 ...

Страница 25: ...mV at 100 oC 74mV pH pH Electrode Response as a Function of Temperature Electrode Response mV pH Figure 11 3 11 2 Polarisation Output Connector The polarisation output connector on the rear panel is for Karl Fischer titrations This titration is a method for determining minute quantities of water in non aqueous liquids The TPS Double Platinum electrode part no 122207 has two connectors The larger B...

Страница 26: ...of a pH sensor If pH readings are inaccurate or unstable the reference junction of the sensor may be blocked The following test can be performed to determine if the reference junction of a pH sensor is making adequate contact with the sample solution 1 Calibrate the 901 PH as per section 3 2 Dilute 1 part of pH6 88 buffer with 9 parts of distilled water 3 Measure the pH of the diluted buffer The r...

Страница 27: ...key the 901 PH will calibrate to around 6 88 pH depending upon the temperature readout 5 If the 901 PH is operating correctly the reading should be totally stable with the wire firmly in place If not the meter requires servicing 6 Now carefully disconnect the wire from the centre pin only make sure the other end of the wire remains connected to the outside frame of the connector 7 The reading shou...

Страница 28: ...registration section returned to TPS Pty Ltd within 7 days No claims will be recognised without the original guarantee card or other proof of purchase This warranty becomes invalid if modifications or repairs are attempted by unauthorised persons or the serial number is missing PROCEDURE FOR SERVICE If you feel that this equipment is in need of repair please re read the manual Sometimes instrument...

Страница 29: ...aired and returned to you by air express where possible For out of warranty units a repair cost will be calculated from parts and labor costs If payment is not received for the additional charges within 30 days or if you decline to have the equipment repaired the complete unit will be returned to you freight paid not repaired For full account customers the repair charges will be debited to your ac...

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