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6. Temperature Calibration

The temperature readout must be calibrated or manually set before attempting Conductivity or pH
calibration. The decimal point is replaced by a “

∗∗

” if the reading is not calibrated.

6.1 Temperature Calibration Procedure

1. Ensure that the

hydro

CHEM

is in Standby mode (see section 3.3).

2. Plug the Conductivity/Temperature sensor into the

Cond/Temp

socket.

3. Place the sensor into a beaker of room temperature water alongside a good quality mercury

thermometer. Stir the sensor and the thermometer gently to ensure an even temperature
throughout the beaker.

4. Select Temperature Calibration (

→

F1:Calibrate

→

F3:Temperature

The Temperature Calibration screen is now displayed. For example…

Enter Actual Temperature : 25.0 24*0

Temperature Calibration Menu Quits

The cursor is at the new temperature value you will be setting.

The current reading from the Temperature sensor is displayed on the far right of the top line.

5. When the reading from the Temperature sensor has stabilised, use the

and

keys to enter

the same temperature as measured by the mercury thermometer.

6. Press the

key to calibrate the temperature readout.

Alternatively, press the

key to abort temperature calibration.

6.2 Temperature Calibration Notes

1. The

hydro

CHEM

has an allowable Offset range of –10.0 to +10.0

. If calibration fails due to

the Offset being outside these limits, then please consult the Troubleshooting guide (section
24.4) for possible remedies.

2. Temperature calibration information is retained in memory when the

hydro

CHEM

is switched

off, even when the power supply is removed. This information can be recalled later using the
GLP function (see section 14).

3. Temperature does not need to be re-calibrated unless the Conductivity/Temperature sensor is

replaced or the meter is initialised.

6.3 Temperature Calibration Messages

1. If a temperature calibration has been successfully performed, the

hydro

CHEM

will display the

following message and the offset of the sensor. For example…

Temperature Calibration OK
0.1

C Offset

2. If a temperature calibration has failed, the

hydro

CHEM

will display the following message

and the failed offset value of the sensor. For example…

Temperature Calibration Failed
11.0

C Offset

Содержание hydroCHEM

Страница 1: ...tion The introduction has a diagram and explanation of the display and controls of the hydroCHEM It also contains a full listing of all of the items that you should have received with the unit 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 hydroCHEM inc...

Страница 2: ...2 Temperature Calibration Notes 19 6 3 Temperature Calibration Messages 19 7 Conductivity Calibration 20 7 1 Conductivity Calibration Procedure 20 7 2 Conductivity Calibration Notes 21 7 3 Conductivity Calibration Messages 21 8 TDS Calibration 22 8 1 TDS Calibration Procedure 22 8 2 TDS Calibration Notes 23 8 3 TDS Calibration Messages 23 9 pH Calibration 24 9 1 pH Calibration Procedure 24 9 2 pH ...

Страница 3: ...and Statistical Software 43 16 5 Commands 44 16 6 Data Format 45 16 7 GLP Data Format 47 16 8 Importing Data into Microsoft Excel 48 17 Setting the Clock 50 18 Selecting the Conductivity TDS units 51 19 Selecting Display Resolution 51 20 Emergency ShutOFF timer 52 20 1 Procedure in event of ShutOFF timer being tripped 52 21 Selecting Buffers for Auto Buffer Recognition 53 22 Resetting the hydroCHE...

Страница 4: ...3 1 Introduction 1 1 hydroCHEM Display and Controls 1 2 hydroCHEM Connectors ...

Страница 5: ...e key to alternate between standard display and large digit display See section 1 9 Press and hold the key while scrolling data with the and keys to speed up the scrolling rate 1 8 Arrow Keys Press the and keys to scroll values up and down when entering or displaying data Press the and keys to move the cursor left and right when setting the calendar clock when Plus Pack is fitted See section 17 1 ...

Страница 6: ...ng panel 2 Dosing panel with 3 peristaltic pumps and 116320 sample chamber 3 4 Terminal Conductivity Sensor 122205 4 Gel filled pH Sensor 121227 5 pH4 00 Buffer 200mL 121381 6 pH6 88 Buffer 200mL 121306 7 2 76mS cm Conductivity Standard 200mL 122306 8 24V DC Plug Pack Power Supply 130106 or other to suit country of destination 9 2 metres of Semi rigid Input Tubing 116358 10 2 metres of Flexible Ou...

Страница 7: ... Alarms F1 Enable Disable F2 Set Alarm Margins F3 Set Alarm Delay Times F4 Logger F1 Recall F2 Erase F1 Erase All F2 Erase Last F3 Print F4 Program F5 Enable or F5 Disable F5 System F1 Password F1 Change Code F3 Enable Security Enter Code or F3 Disable Security F2 GLP F1 Recall Cal F2 Print Cal F3 Recall Sys F4 Print Sys F3 Clock F4 Baud F1 300 F2 9600 F3 19200 F5 Setup F1 Units F1 mS cm F2 ppK TD...

Страница 8: ...ol Direction The hydroCHEM is factory set to add nutrient when the Conductivity reading is lower than the limit and to add acid when the pH reading is higher than the limit To change these settings 1 Select the Limits menu F3 Limits 2 Select F2 Direction from the menu The following screen will now be displayed Select Conductivity Direction F1 Add when LOW F2 Add when HIGH The arrow indicates the c...

Страница 9: ...on Press to select Fine Sensitivity The control band will be 0 1 mS cm Press to select Medium Sensitivity The control band will be 0 2 mS cm Press to select Coarse Sensitivity The control band will be 0 3 mS cm 3 The hydroCHEM confirms the selection and then goes on to select the pH Sensitivity Select pH Sensitivity F1 Fine F2 Medium F3 Coarse The arrow indicates the current selection Press to sel...

Страница 10: ...ty control action of the hydroCHEM when the limit is set to 2 0 mS cm adding when low with medium control sensitivity 0 2 mS cm 2 The following diagram illustrates the pH control action of the hydroCHEM when the limit is set to 6 5 pH adding when high with fine control sensitivity 0 1pH ...

Страница 11: ...to set the Conductivity alarm margin The minimum alarm margin is dependant on the Control Sensitivity setting which can be 0 10 mS cm Fine 0 20 mS cm Medium or 0 30 mS cm Coarse The maximum alarm margin is 2 00 mS cm The Low and High Alarm values displayed are calculated using the current Conductivity Limit and Sensitivity settings As the or key is released the display is updated with re calculate...

Страница 12: ...he and keys to set the pH alarm delay time The allowable range is 5 to 60 minutes Press to save the new value or press to quit without saving the changes 4 The alarm delay times are now set to the required values 2 5 3 Enabling and Disabling the Alarm Function To enable the alarm function 1 Set the required Alarm Margins and Alarm Delay Times as per sections 2 5 1 and 2 5 2 2 Select the Alarms men...

Страница 13: ...xtend the ON time if the pump rate is not high enough to keep up with chemical demand for the current ON time Place the chemical addition point as close as possible to the take up for the sample chamber The Conductivity and or pH levels in the system may have changed too rapidly for the dosing pumps to keep up If this was due to a singular event eg top up tank with fresh water then the alarm may b...

Страница 14: ...d an alarm delay time of 5 minutes The limit is set to 2 0mS cm adding when low and with medium control sensitivity 0 2 mS cm 2 The following diagram illustrates the pH control action of the hydroCHEM with an alarm margin of 0 3pH and an alarm delay time of 5 minutes The limit is set to 6 5 pH adding when high and with medium control sensitivity 0 2pH ...

Страница 15: ...5 minutes and the OFF times are set to 10 minutes This means that the unit will dose for a maximum of 5 minutes then wait for 10 minutes These ON and OFF times cycle repetitively At all times the Conductivity and pH pumps will only operate when the readings are outside the limits Correct use of an ON and OFF cycle will avoid overdosing problems 3 1 Setting up the Conductivity control function 1 Se...

Страница 16: ...hanges 8 The pH control function is now set up and the hydroCHEM returns to the Control menu 3 3 Selecting Automatic Control or Standby Modes To enable the hydroCHEM to automatically control Conductivity and pH Automatic mode must be selected The pumps will operate according to the ON and OFF times discussed in sections 3 1 and 3 2 when Conductivity and or pH readings are outside the limits To dis...

Страница 17: ...ient A pump time remains on the display for your reference Cond A Quick Dose Time 5 mins Enter Cond B Quick Dose Time 5 mins Use the and keys to set the time for which the Nutrient B pump is to operate from 0 to 10 minutes 5 The hydroCHEM now prompts you to enter the dosing time for the pH pump The default time is 5 minutes Enter pH Quick Dose Time 5 mins Use the and keys to set the time for which...

Страница 18: ...erate until adequate flow is restored Quick Dose is still operational Ensure that the quick dose cycle will not cause the system to be over dosed The Conductivity pH and Temperature being sent to the RS232 port is replaced with spaces see section 16 6 5 1 1 Flow Sensing Troubleshooting Symptom Possible Causes Suggested Remedy NoFlo message does not appear even when the Conductivity sensor is dry a...

Страница 19: ... detects that the pump is not operating The data is replaced by NoFlo on the hydroCHEM display Automatic control is disabled The Nutrient and pH control outputs will not be activated unless the feeding or recirculating pump is operating Quick Dose is still operational Ensure that the quick dose cycle will not cause the system to be over dosed The Conductivity TDS pH and Temperature data being sent...

Страница 20: ...and keys to enter the same temperature as measured by the mercury thermometer 6 Press the key to calibrate the temperature readout Alternatively press the key to abort temperature calibration 6 2 Temperature Calibration Notes 1 The hydroCHEM has an allowable Offset range of 10 0 to 10 0 O C If calibration fails due to the Offset being outside these limits then please consult the Troubleshooting gu...

Страница 21: ... Conductivity signal and attempt a Zero calibration For example 0 1mS cm 25 0O c Press Enter to Calibrate to Zero 7 When the reading has stabilised at or near zero press to calibrate or to quit The will not be removed after a zero calibration Standard Calibration 8 Place the Conductivity sensor into a sample of 2 76 S cm or 1 41 S cm standard so that it is immersed at least to the first vent hole ...

Страница 22: ...alibrated for the mode in which it will be used The hydroCHEM may require re calibration when alternating between Conductivity and TDS modes 7 All calibration information is retained in memory when the hydroCHEM is switched off even when the power supply is unplugged This information can be recalled or printed later using the GLP function see section 14 8 The hydroCHEM displays the value of the st...

Страница 23: ...ignal and attempt a Zero calibration For example 0 1ppK 25 0O c Press Enter to Calibrate to Zero 7 When the reading has stabilised at or near zero press to calibrate or to quit The will not be removed after a zero calibration Standard Calibration 8 Place the Conductivity sensor into a sample of 2 0 ppK standard so that it is immersed at least to the first vent hole as per the diagram below DO NOT ...

Страница 24: ...y calibrated for the mode in which it will be used The hydroCHEM may require re calibration when alternating between Conductivity and TDS modes 7 All calibration information is retained in memory when the hydroCHEM is switched off even when the power supply is unplugged This information can be recalled or printed later using the GLP function see section 14 8 The hydroCHEM displays the value of the...

Страница 25: ...the entire bulb and reference junction are immersed as per the diagram below Place the Conductivity Temperature sensor into a separate beaker of liquid that is at the same temperature as the buffer this is required for correct Temperature compensation DO NOT place the electrodes directly into the buffer bottle 6 Select pH Calibration F1 Calibrate F2 pH The display should now look something like th...

Страница 26: ...for the displayed reading to stabilise before attempting to calibrate the hydroCHEM Press to calibrate to the displayed buffer or to quit without re calibrating 10 The hydroCHEM is now calibrated and is ready for use Discard the used samples of buffer 9 2 pH Calibration Notes 1 The hydroCHEM has an allowable Asymmetry range of 1 00 to 1 00 pH The allowable Slope range is 85 0 to 105 0 If calibrati...

Страница 27: ...ollowing message and the failed asymmetry value of the electrode For example Calibrate Failed 1 1 pH Asymmetry Repeat Cal or Initialise Calibration 3 If a 2 point calibration has been successfully performed the hydroCHEM will display the following message and the asymmetry and slope of the electrode For example Slope Asymmetry Calibration Successful 0 10pH Asym 99 0 Slope 4 If a 2 point calibratio...

Страница 28: ... a line as possible Do not coil the output tubing The sample drain tap is provided for two reasons Firstly it allows the operator to obtain a sample of nutrient from the flow chamber This may be required if the nutrient is to be checked by another instrument for example The second use of the sample drain tap is to completely drain the sample chamber This makes the process of cleaning easier as it ...

Страница 29: ...tting The flow should not completely fill the sample chamber as this will cause pressure which may make the sample chamber leak If the flow is not sufficient to cause the nutrient to flow over the top of the normal overflow fitting then Conductivity readings will be too low or the hydroCHEM may even register a No Flow condition ...

Страница 30: ...ied with a pump power cable part number 130104 Plug one end into the Control Output socket on the hydroCHEM unit and the other end into the socket on the pump box See the diagrams in sections 1 1 and 1 2 2 Connect the Input Tubing The input tubing is the semi rigid tubing part number 116358 Connect this to the tube fitting on the LEFT side of the each pump The compression fitting makes it easy to ...

Страница 31: ...low the user to adjust the pumps to obtain a 1 1 output Use the Quick Dose function see section 4 to run the pumps for a reasonable length of time 5 minutes should suffice Measure the output of each pump and adjust the control for More A or More B accordingly Repeat the test to ensure the adjustment was correct The performance of the pumps will vary over time due to normal wear and build up of und...

Страница 32: ...p tube out as it turns After approximately 3 4 of a turn the right hand side compression fitting can be pulled out The old pump tube has now been removed To fit a new Pump Tube 1 2 3 4 Turn the roller holder so that the rollers are in a horizontal line Push the left hand side compression fitting into its seat round side facing in Begin turning the roller holder clockwise so that the roller holder ...

Страница 33: ...d pumps must be carried out by a qualified electrician 13 Password Security The password security feature prevents unauthorised persons from accessing any of the menu functions of the hydroCHEM 13 1 Enabling the Password Security function 1 Select the Password menu F5 System F1 Password 2 Select F3 Enable Security Enter Code from the menu 3 The hydroCHEM now prompts you to enter a 4 digit password...

Страница 34: ...m F1 Password Of course you will need to enter the current password after pressing the key 2 Select F1 Change Code from the menu 3 The hydroCHEM now prompts you to enter a new password Enter NEW 4 digit access code _ Press F1 F2 F3 F4 F5 to Enter code Press any combination of 4 of the to keys Any of the keys may be repeated as often as you wish You do not need to press after pressing the 4th key 6...

Страница 35: ...bing how to scroll through the Calibration information The date and time are displayed only when the Plus Pack is fitted hydroCHEM V3 0 S1234 31 12 01 12 00 Next 4 Press the key to sequentially scroll through the Calibration information for all parameters Press the key to scroll back to previous data The sequence of information displayed is shown below Press to abort at any time Calibration Data D...

Страница 36: ...ond Zero 0 00mS cm 31 12 2001 10 00 Cond Span 100 0 31 12 2001 10 10 pH Asy 0 10pH 31 12 2001 10 20 pH Slope 100 0 31 12 2001 10 30 Temperature Offset 0 1oC 31 12 2001 10 40 ENDS 14 3 Recalling System information on the display 1 Select the GLP menu F5 System F2 GLP 2 Select F3 Recall Sys from the menu 3 The instrument model firmware version number and instrument serial number are displayed along ...

Страница 37: ...c Next Back Primary Buffer 6 88pH Next Secondary Buffers 4 00 9 22pH Back Cond Dosing Hours 0 Next pH Dosing Hours 0 Back Alarms Enabled Next Back Cond Limit 2 0mS cm Add if Low Next Cond Sensitivity Medium Back Cond ON Time 15 mins Next Cond OFF Time 5 mins Back Cond ShutOFF Timer 60 mins Next Cond A Quick Dose Time 5 mins Next Cond B Quick Dose Time 5 mins Back Continued over the page ...

Страница 38: ...mit 6 5pH Add if High Next pH Sensitivity Medium Back pH ON Time 10 mins Next pH OFF Time 5 mins Back pH ShutOFF Timer 15 mins Next pH Quick Dose Time 5 mins Back pH Alarm Margin 0 3pH Next pH Alarm Delay Time 10 mins Back pH High Alarm 7 0pH Ends pH Low Alarm 6 2pH Back When the Plus Pack is fitted an additional screen showing the currently selected RS232 baud rate is provided ...

Страница 39: ...001 10 10 pH Asy 0 10pH 31 12 2001 10 20 pH Slope 100 0 31 12 2001 10 30 Temperature Offset 0 1oC 31 12 2001 10 40 Primary Buffer 6 88pH Secondary Buffers 4 00 9 22pH Cond Dosing Hours total operating hours of Conductivity pumps pH Dosing Hours total operating hours of pH pump Alarms Enabled or Disabled Flow Detection by Cond Cond Limit 2 0mS cm Add if Low Cond Sensitivity Medium Cond ON Time 15 m...

Страница 40: ...oved or becomes illegible it is also available on the hydroCHEM display 1 The serial number is displayed at turn on for example hydroCHEM V3 0 S1234 C 2001 TPS P L Hydroponics Controller The after hydroCHEM is shown when the Plus Pack is fitted 2 The serial number is displayed when recalling the Calibration or System information sections 14 1 and 14 3 3 The serial number is included on the printou...

Страница 41: ...ecords into memory or to the RS232 port First the logging period must be programmed then automatic logging can be started and stopped as required To program the logging period 1 Select the Logger menu F4 Logger 2 Select F4 Program from the menu The display should now look similar to that shown below The current Logging Period is displayed Enter Logging Period 1 Hour Press to select period 3 Use th...

Страница 42: ...l wait until 2 00 before recording the first reading This feature makes data much easier to examine visually later 5 When logging data into memory the hydroCHEM alternates between the next log number and the time the next reading is due to be logged on the display When sending data to the RS232 port the hydroCHEM alternates between the word Send and the time the next reading is due to be sent on t...

Страница 43: ...the Notepad to the RS232 Port 1 Connect one end of the RS232 cable to the Power RS232 socket of the hydroCHEM 2 Connect the other end of the RS232 cable to an RS232 Printer or to the COM1 or COM2 ports of a PC 3 Ensure that the baud rate for the printer or PC and the hydroCHEM are the same If necessary alter the baud rate of the hydroCHEM see section 16 1 The hydroCHEM uses XON XOFF protocol Ensur...

Страница 44: ...gging See section 15 2 for details Press while recalling data on the display see section 15 3 to send that record to the RS232 port 16 3 RS232 Configuration The hydroCHEM RS232 configuration is 8 Bits No Parity 1 Stop Bit XON XOFF Protocol This information is displayed when setting the baud rate see section 16 1 16 4 Communication and Statistical Software Communication between the hydroCHEM and a ...

Страница 45: ...ings in memory for example hydroCHEMsV3 0sS1234s2300 cr where s are spaces Note that the number of logged readings is right justified Request GLP information G cr Returns all calibration and system set up information instrument model serial number and current date see section 16 7 for data format and handshaking Positions of Data Fields P cr Returns the number of data fields along with their posit...

Страница 46: ...cccc is the Conductivity TDS unit description which can be any one of the following mS cm for millisiemens per centimetre in Conductivity mode CF for CF Units in Conductivity mode dS M for decisiemens per metre in Conductivity mode ppK for parts per Thousand in TDS mode is one space is one space SSSSSSS is the Conductivity Control Status is one space 123 is Conductivity Alarm Status 1 can be A for...

Страница 47: ...data 5 characters right justified The data is replaced by 6 spaces when there is no flow through the sample chamber tt is the unit description sent as oC When requested by a PC with the D or R commands section 16 5 the data is terminated with a carriage return When the data is sent by the hydroCHEM using the Print function section 15 5 or the Instant Send function section 16 2 the data ends with a...

Страница 48: ...Cond Dosing Hours total operating hours of Conductivity pumps pH Dosing Hours total operating hours of pH pump Alarms Enabled or Disabled Flow Detection by Cond Cond Limit 2 0mS cm Add if Low Cond Sensitivity Medium Cond ON Time 15 mins Cond OFF Time 5 mins Cond ShutOFF Timer 60 mins Cond A Quick Dose Time 5 mins Cond B Quick Dose Time 5 mins Cond Alarm Margin 0 3mS cm Cond High Alarm 2 3mS cm Con...

Страница 49: ... Files prn txt csv 3 Navigate to the folder where your data file is stored and double click it to start the Text Import Wizard Note The default data folder for the WinTPS software is C My Documents WinTPS 4 In step 1 of the Text Import Wizard select Fixed width as per the sample screen below then press Next Note that the data column headers in row one appear only when the data is downloaded using ...

Страница 50: ...ted into a single column to ensure that the X axis is correctly formatted if the data is to be charted later Press Next after all the column breaks have been inserted 6 Simply press Finish at step 3 of the Text Import Wizard TPS recommends that the data format for each column be set once the data is in spreadsheet format For help on formatting the data columns charting graphing or other operations...

Страница 51: ... use the and keys to set the minutes 3 If any corrections are required use the and keys to move the cursor between the various elements of the date and time 4 Press to save the new date and time 5 Alternatively press to quit and retain the current setting Notes 1 The hydroCHEM tests that a valid day of the month is entered If an invalid date is entered eg 31 09 01 the hydroCHEM beeps and displays ...

Страница 52: ...elected units before returning to the Setup menu 19 Selecting Display Resolution This section is applicable when the Plus Pack is fitted To select low or high display resolution when the Plus Pack is fitted 1 Select the Resolution menu F5 System F5 Setup F2 Resolution Select Resolution F1 Low F2 High The arrow indicates the current selection Press to select low resolution Press to select high reso...

Страница 53: ...tting back to within the limit Cond ShutOFF Timer 60 minutes Enter pH ShutOFF Timer 15 minutes Use the and keys to set the required time from 5 to 240 minutes Press and hold the key at the same time as the and keys to scroll keys to scroll rapidly 5 Press to save the ShutOFF timer setting for the pH pump Press to quit and retain the current setting 20 1 Procedure in event of ShutOFF timer being tr...

Страница 54: ...rimary buffer Press to select pH7 00 as the primary buffer Press to quit and retain the current buffer settings 3 If or was press above the hydroCHEM will now prompt you to select the Secondary pH Buffers you wish to use for calibration Select Secondary Buffers F1 4 00 9 22pH F2 4 00 10 06pH The arrow indicates the current selection Press to select pH4 00 and pH9 23 as the secondary buffers Press ...

Страница 55: ...Re calibrated before use 4 The hydroCHEM now returns to the Setup menu Note that in the decimal points will be replaced with a in normal display mode to indicate that the unit must be re calibrated 22 2 Resetting the Full System information 1 Select the Reset menu F5 System F5 Setup F5 Reset 2 Select F2 Full System from the menu 3 The following message is now displayed Reset Full System Are you su...

Страница 56: ...H Sensor Slope 100 0 Primary Buffer pH6 88 Secondary Buffers pH4 00 pH9 22 Control Limit 6 5 pH Control Direction Add if High Control Sensitivity Medium Control ON Time 10 Minutes Control OFF Time 5 Minutes ShutOFF Timer 20 Minutes Quick Dose Time 5 Minutes Alarm Margin 0 30 pH Alarm Delay Time 10 minutes Temperature Sensor Offset 0 0 O C Alarms Disabled RS232 Port when the Plus Pack is fitted RS2...

Страница 57: ...ld up of salts or algae between wires 2 Conductivity sensor is faulty Clean probe as per section 25 2 2 Return sensor to factory for repair or replacement NoFlo message appears even when the Conductivity sensor is in solution hydroCHEM DS unit which uses Conductivity reading for flow sensing 1 Conductivity of solution is below 0 5 mS cm 0 2 ppK TDS 2 Conductivity sensor is faulty The flow sensing ...

Страница 58: ...air or replacement Return to factory for repair Standard calibration fails and span is greater than 133 1 Standard solution is inaccurate 2 Sensor may have a build up of conductive material such as salt 3 Sensor is faulty 4 Faulty instrument Replace standard solution Clean sensor as per the instructions detailed in section 25 2 2 Return sensor to factory for repair or replacement Return to factory...

Страница 59: ...erence junction as per instructions supplied with the electrode Displays 7 00 for all solutions Electrical short in connector 1 Check connector Replace if necessary 2 Replace electrode Displays 4 5 pH for all solutions Glass bulb or internal stem cracked Replace electrode 24 4 Temperature Troubleshooting Symptom Possible Causes Remedy Temperature inaccurate and cannot be calibrated 1 Faulty connec...

Страница 60: ...atinum wires wound around a central stem The stainless steel tip is purely for temperature measurement Although the four wire system is extremely resistant to fouling avoid contact with oily materials and excessive algae build up If a coating is allowed to form on the surface of the wires accuracy will be reduced Conductivity sensors can be stored dry Ensure that the sensor is stored in a covered ...

Страница 61: ...at slightly above or below 7 00 pH The amount of variance from 7 00 pH is called the asymmetry Figure 25 1 illustrates how asymmetry is expressed 600 400 200 0 200 400 600 0 7 14 mV 1 00 pH Asymmetry 0 00 pH Asymmetry 1 00 pH Asymmetry Response of pH Electrode as a Function of Asymmetry pH Figure 25 1 25 3 2 Slope of a pH Electrode As mentioned above a pH electrode produces 0 mV output at around 7...

Страница 62: ... Compensation ATC probe or by entering the sample temperature manually Figure 25 3 shows the slope of a pH electrode at various temperatures 600 400 200 0 200 400 600 0 7 14 mV 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 pH Figure 25 3 ...

Страница 63: ...matic recognition of 2 0 ppK standard pH Asymmetry Range 1 00 to 1 00 pH pH Slope Range 85 0 to 105 pH Buffers Automatic recognition of pH4 00 pH6 88 pH7 00 pH9 23 and pH10 06 buffers See section 21 for details on selecting buffers Temperature Offset Range 10 0 O C to 10 0 O C Control Set up pH Conductivity TDS Limit Range 0 to 14 0 pH 0 to 9 9 mS cm 0 to 9 9 ppK Sensitivity Fine 0 1 pH 0 1 mS cm ...

Страница 64: ...ding date and time Automatic Datalogging User selectable for one reading every 1 2 5 10 15 20 or 30 minutes or every 1 2 3 4 6 8 12 or 24 hours RS232 Serial Interface This section is applicable when the optional Plus Pack is fitted Port Configuration 8 Bits No Parity 1 Stop Bit XON XOFF Protocol Baud Rates User selectable for 300 9600 or 19200 Baud Calendar Clock This section is applicable when th...

Страница 65: ... is in need of repair please re read the manual Sometimes instruments are received for repair in perfect working order This can occur where the sensor s simply requires cleaning or replacement or some other field serviceable event TPS Pty Ltd has a fine reputation for prompt and efficient service In just a few days our factory service engineers and technicians will examine and repair your equipmen...

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