AquaCal 2000 PURE WATER CONDUCTIVITY METER OPERATION GUIDE
Preface Preface Product warranty This guide, together with its associated software media and hardware, has a warranty against defects in materials and workmanship for a period of three years from the date of shipment. During this period LTH will, at its own discretion, either repair or replace products that prove to be defective. The associated software is provided 'As is' without warranty.
Preface Standards Electromagnetic compatibility This instrument has been designed to comply with the standards and regulations called up by the European Directive on EMC Safety This instrument has been designed to comply with the IEC 348-1978 (BS 4743-1979) safety standard to Protection Class 1. Quality This instrument has been manufactured under the following quality standard: ISO 9001:2000.
Preface Contents 1 Introduction Traceable calibration AquaCal 2000 functions Analogue outputs Specifications 2 Installation Cells and sampling Connections and cabling D-connector Cell & Pt1000 D-connector - Battery charger and voltage outputs D-connector - Mounted on battery charger for voltage outputs 3 Operation Viewing the readings Viewing the AquaCal 2000 settings 4 Setting Up Security setting Range and units Units Range Temperature compensation Cell constant Output Temperature output Conductivity o
Preface 5 Fault Finding 5-1 Introduction 5-1 Faults 5-2 Instrument appears dead 5-2 Instrument display appears to malfunction 5-2 Unable to program the instrument 5-2 Membrane switch panel appears to malfunction 5-2 Conductivity reading appears incorrect 5-2 Temperature reading appears incorrect 5-3 Voltage outputs appear incorrect or noisy 5-4 Error messages 5-4 General 5-5 System setup and operations 5-6 Conductivity/resistivity voltage output operations 5-6 Temperature voltage output settings 5-7 Anal
1 Introduction 1 Introduction The AquaCal 2000 is a handheld microprocessor based unit which allows measurement to traceable standards. It measures the conductivity or resistivity of an aqueous solution and gives a direct digital readout. The instrument can be set to operate on a single fixed range or with full auto ranging. Two voltage outputs for remote monitoring or recording are available.
1 Introduction The following table summarises the functions provided by each key. In some cases, further functions can be reached by pressing . Key Description ON/OFF Switches the unit ON or OFF MEASURE Displays the conductivity/resistivity and temperature. RANGE/UNITS Displays the range and units and allows changes to be made. TEMP.COMP. Allows the temperature compensation to be turned on or off and the compensation slope to be set between 0.0 and 3.9%/°C.
1 Introduction The following functions are obtained by pressing two keys simultaneously. Keys Followed by Description Displays the error messages flag and allows them to be set IN (messages displayed) or OUT (not displayed). Displays and allows changing of the Auto Power Off time. Displays and allows selection/deselection of the input filter. Prompts the user to enter a security code; if code is entered correctly, user can lock or unlock instrument settings.
1 Introduction Specifications Ranges of measurement Conductivity Resistivity 0 - 0.9999 µS/cm 0 - 999.9 K.cm 0 - 9.999 µS/cm 0 - 9.999 M.cm 0 - 99.99 µS/cm 0 - 99.99 M.cm Temperature -10.0 - +110.0°C 0 - 9.999 µS/m 0 - 99.99 µS/m 0 - 999.9 µS/m 0 - 9999 µS/m User selectable or full auto ranging Temperature compensated system accuracy, including linearity and repeatability 0.3% of range 0.3% of range 0.1°C Ambient temperature 0-50°C Ambient temperature variation 0.
1 Introduction Battery type 4 x AA alkaline or NiCad rechargeable Battery life 40 hours continuous with alkaline batteries. NiCad batteries have typically half this life. Recharge time 24 hours from flat Low battery warning By a symbol on the display Auto power off Selectable, 1 minute to 40 hours, or disabled. Security Access code entered on the front panel. Electromagnetic compatibility Immunity IEC 801-2 to Level 4. IEC 801-3 to Level 3. IEC 801-4 to Level 3. IEC 801-5 (Draft) to Level 1.
1 Introduction Cell type CMC26/001/PT43 Cell constant Nominally 0.01 supplied with traceable certification. Cell cable length Standard 2 metres.
2 Installation 2 Installation Cells and sampling Refer to Appendix A for extracts from ASTM D5391-99 referring to cell positioning, flow rate and sampling. Although other cells can be used with the AquaCal 2000 instrument, the CMC26/001/PT43 allows measurement to traceable standards. To enable this, the cell is provided with a certified cell constant. The cell constant must be entered on the instrument to ensure accurate readings.
2 Installation Figure 5 shows the arrangement where a battery charger/power supply is used. In this case, the voltage output cable connects to the charger/supply unit instead of direct to the unit. Battery charger/power supply units are available for use on 110V AC and 230V AC; check the label on the unit before connecting it to the mains supply. Note: Hosetail connectors and sealing washers are available as an optional extra. These will fit tubing of 1/4"I.D.
2 Installation Figure 3 Suspended flow chamber 2-3
2 Installation Figure 4 Connections for battery operation See page 2-6 for wiring information.
2 Installation Figure 5 Connections for mains operation See page 2-6 for wiring information.
2 Installation D-connector Cell & Pt1000 1 C (centre electrode) 6 G (guard) 2 E (outer electrode) 7 Earth/shield 3 Earth/shield 8 T4 4 T1 9 T3 5 T2 T1 and T3 are connected to one side of the Pt1000. T2 and T4 are connected to the other side of the Pt1000. Note: the 4 wire connection to the RTD must be maintained for instrument accuracy.
3 Operation 3 Operation This chapter explains the AquaCal 2000 display and the operational functions available from the front panel membrane switches. The AquaCal 2000 functions are selected using six operation keys in conjunction with the three modifier keys , and . The main functions are selected by pressing the corresponding key on its will scroll through other displays where own. Subsequent presses of applicable. Some functions are also available by pressing two keys simultaneously.
3 Operation Viewing the AquaCal 2000 settings The following table shows the functions for viewing each of the AquaCal 2000 settings. In many cases, the operational key displays a sequence of settings which you step through by pressing To view Press . Display shows (example) Range and units Range Units 9.999 µS/cm Temperature Compensation TC In Cell Constant Cell Constant 0.01000 Conductivity Output Settings Output : COND Base 25°C Slope 2.0%/°C Output Range 9.999 µS/cm Zero 0.
3 Operation To view Error Messages setting Press Display shows (example) Output : TEMP Zero 0.0 Span 100.0 C Errors In (error messages displayed) or Errors Out (not displayed). Auto off setting Auto off 0:10 Filter setting Filter In (measurements averaged) or Filter Out (not averaged) Security setting Yes Hh:Mm 0000 Out Enter Code If you enter the correct security code, display will change to Security Out or Security In. Parameter settings can be altered if the security setting is Out.
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4 Setting up 4 Setting Up This chapter describes the recommended procedure for setting up and configuring the AquaCal 2000. When pressing a key, hold it down for about half a second or just long enough to produce the desired effect. Holding a key down for more than one second causes repeated action of the key function, where appropriate. Displayed figures shown in bold are flashing. Security setting To prevent casual tampering with parameter settings, the instrument can be made secure.
4 Setting up Press Display shows Explanation (example) 5 Security Out Display change to allow user to change setting 6 Security Out The setting flashes Security In Change the setting Security In Enter the setting or 7 or 8 Press MEASURE to leave the security screen. Range and units The ranges that are available (see page 1-4) depend on the units selected. Therefore if a change of units is required, these should be set first. After setting the units, the range is automatically set to Auto.
4 Setting up Press Display shows Explanation (example) 3 Range Units Auto µS/cm 4 Range Units Change the units as required Auto M.cm The units flash or 5 Range Units Enter the new units Auto M.cm If a range change is now required, follow the procedure for changing the range, omitting the first step.
4 Setting up Range Press Display shows Explanation (example) 1 Range Units Auto µS/cm The present range and units are displayed Range Units µS/cm Auto The range flashes Range Units µS/cm 9.999 Set the range as required 4 Range Units 9.999 µS/cm The units flash 5 Range Units 9.
4 Setting up Temperature compensation Press 1 Note: Display shows (example) Explanation TC In The present settings are displayed. Base Slope 25°C 2.0%/°C If TC is Out, Base and Slope are not displayed as they are not relevant. 2 TC In Base Slope 25°C 2.0%/°C The T.C. In (or Out) flashes or or Press 3 to change the T.C. status. TC In Base Slope 25°C 2.0%/°C Enter T.C. status and advance to base temperature If Out is selected, the display clears and no further entry is necessary.
4 Setting up Press 8 Display shows Explanation TC In Base Slope 20°C 1.9%/°C Set the digit TC In Base Slope 20°C 1.9%/°C Enter the slope value or 9 Cell constant Press Display shows Explanation 1 Cell Constant 0.01000 The present setting is displayed 2 Cell Constant 0.01000 The digit '1' flashes. This digit can only be set as either 1 or 0, as the cell constant can only be set between 0.00900 and 0.
4 Setting up Output Press Display shows (example) Explanation 1 Output : COND 2 Output : COND COND flashes Output : TEMP Toggles between TEMP and COND or 3 or The next screen depends on whether COND or TEMP is selected, see page 4-9 for COND settings. Temperature output Press Display shows (example) Explanation 4 Output : TEMP TEMP flashes 5 Output : TEMP 6 Zero 0.0 7 Zero Span 000.0 100.0°C or Span 100.
4 Setting up Press Display shows (example) 8 Explanation Increment or decrement the flashing digit or 9 Enter the flashing digit and move to the next digit Repeat steps 8 and 9 for each digit of both zero and span values. When the last digit is flashing, press 4-8 to confirm the settings.
4 Setting up Conductivity output Press Display shows (example) Explanation 4 Output : COND COND flashes 5 Output : COND 6 Output Range 9.999 µS/cm 7 Output Range 9.999 µS/cm The present output range is displayed or Note: The conductivity output units must be the same as the measurement units. If the measurement units have been changed, the old units will or is pressed to flash the range. At this be displayed, until time, the units will automatically align with the measurement units.
4 Setting up Error messages, auto power off and input filter Note: Some of the following steps should be omitted where changes are not required to all of the settings. Press Display shows (example) Explanation 1 Errors In Error messages will be displayed. 2 Errors In In flashing. Errors Out Select In or Out to display error messages (In) or not (Out). 4 Errors Out Enter setting 5 Auto off Yes 00:10 Hh:Mm Instrument will switch off after 10 minutes if no key has been pressed.
4 Setting up Press Display shows (example) Explanation Repeat steps 8 and 9 for each digit. The data is entered into memory during step 9 for the last digit. 10 To confirm Auto Off time. Instead of displaying each measurement as it is made, the Filter option displays the average of the last 16 measurements, thus reducing any fluctuations due to variations of the water conductivity at the sample point.
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5 Fault finding 5 Fault Finding Introduction Note: THERE ARE NO USER SERVICEABLE PARTS INSIDE THE UNIT. A set of error messages has been built into the system to aid fault finding and diagnosis. If one of these messages is being displayed, refer to the table at the end of this section; this lists some possible causes and suggested actions. Ensure that the error messages have not been turned off; refer to the final part of Section 4, Error messages, auto power off and input filter.
5 Fault finding Faults Instrument appears dead 1. Check that batteries are fitted and have correct polarity. Try using the battery charger to power the instrument. 2. Remove batteries for a few seconds, then replace them and switch on. This checks that a programme latch-up has not occurred. Instrument display appears to malfunction 1. Switch off (or remove batteries) and on again. Check that the display shows full blocks for five seconds, followed by the Software Issue number. 2.
5 Fault finding Temporarily switching out the temperature compensation can help to show if this is the cause of the problem. 6. If another sensor is available, this can be used to determine whether the fault lies with the instrument or the sensor. 7. Check that the temperature compensation base temperature is set correctly to 20°C or 25°C, as required. 8. Check that the sensor cable is not damaged or broken and that the screen does not make contact with any other terminals or metal work.
5 Fault finding Voltage outputs appear incorrect or noisy 1. Check that the load resistance is not less than 10K. 2. Check that the plug and cable is not broken or damaged (see 9 way Dconnector details in Section 2). 3. If a junction box is used, check that it has been wired correctly. 4. Check that the cable is not too close to power cables, contactors, motors etc. 5. Check that screened cable or twisted-pair wiring has been used for the output connections in electrically-noisy environments. 6.
5 Fault finding General Error Description Action/Explanation Main input saturation. Solution conductivity/resistivity is too high, for the selected range, or is at an extreme of temperature. See the appendices for details. Main input saturation. Solution conductivity/resistivity is too low, for the selected range, or is at an extreme of temperature. See the appendices for details. Temperature sensor open circuit or above 110°C.
5 Fault finding System setup and operations Error Description Action/Explanation Instrument range corrupted. Check units and operating range. Instrument units corrupted. Check units and operating range. Conductivity/resistivity voltage output operations This is only available when the Output option is fitted. Error Description Action/Explanation Measurement units do not match output units. Set output range, zero and span.
5 Fault finding Temperature voltage output settings This is only applicable when the output option is fitted. Error Description Action/Explanation Voltage output zero setting is greater than span setting. Check zero and span settings. Voltage output span is less As for than 10% of full-scale. Temperature is less than voltage output zero. As for Temperature is greater than As for voltage output span.
5 Fault finding Floating-point mathematical routines Error Description Action/Explanation Overflow error. Internal maths computation fault. Check operating conditions first. Underflow error. Internal maths computation fault. Check operating conditions first. Divide by 0 error. Internal maths computation fault. Check operating conditions first. Too large for conversion error. Internal maths computation fault. Check operating conditions first. Too small for conversion error.
6 Guarantee and service 6 Guarantee and service Products manufactured by LTH Electronics Ltd are guaranteed against faulty workmanship and materials for a period of three years from the date of despatch, except for finished goods not of LTH manufacture, which are subject to a separate agreement. All cells made by LTH are thoroughly tested to their published specification before despatch.
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App A Cell positioning Appendix A Cell positioning, flow rate and sampling This is a summary of ASTM D5391-99, combined with LTH application notes. Pure water conductivity or resistivity must be measured with a cell and temperature sensor in a flowing, closed system to prevent trace contamination from wetted surfaces and from the atmosphere.
App A Cell positioning Conductivity cells mounted downstream from ion exchangers are vulnerable to catching ion exchange resin particles between the cell electrodes. Resin particles are sufficiently conductive to short circuit the cell and cause high off scale conductivity or extremely low resistivity readings. Resin retainers must be effective and the cell must be installed so that it is accessible for cleaning.
App B Calculating temp. coefficient Appendix B Calculating the temperature coefficient of a solution If the temperature coefficient of the solution being monitored is not known, the AquaCal 2000 can be used to determine that coefficient. You should set the AquaCal 2000 to auto ranging, with the temperature compensation IN and the temperature coefficient to 0.0%. The following measurements should be done as near to the normal operating point as practical, between 5C and 70C for the highest accuracy.
App B Calculating temp.
Index Index A E Accuracy 1-4 Ambient temperature 1-4 Aquacal Settings, viewing 3-2 Atmospheric effects A-2 Auto off setting 3-3 Auto power off 1-5, 4-10 Auto power off time 1-3 B Battery Battery charger 1-5, 5-2 2-1 C 1-5 5-1, 5-4 1-3 3-3, 4-10 F Fault finding Filter setting Flow chamber Flow rate 5-1 3-3 2-1 A-1 G Guarantee Cabling 2-1, 5-3 Calibration, traceable 1-1 Carbonic acid A-1 Cell adaptor cable 2-1 Cell constant 1-1, 1-4, 2-1, 3-2, 4-6, A-1 Cell extension cable A-2 Cell K 1-2 Cell posit
Index P pH Sensors Power supply Programming A-1 2-1 5-2 R Range 3-2, 4-2, 4-4, 5-3, 5-6 Range units 1-2 Ranges 1-4 Repeatability 1-4 Resin particles A-2 Resistivity 1-4 Resistivity output 4-9 S Sampling Saturation of input Security code Service Setting up Specification 2-1, A-1 5-5 3-3, 4-1 6-1 4-1 1-4 T Temperature 1-4 Temperature compensation 1-4, 3-2, 4-5, A-1 Temperature output 4-7 Trace contamination A-1 Traceable calibration 1-1 Traceable standards 1-1 U Units 3-2, 4-2, 5-6 V Voltage outputs
AQUACAL 2000 Quick Reference Press ON/OFF to turn the AquaCal 2000 on (and off). Press MEASURE to display conductivity and temperature. Setting security To prevent tampering with parameters, the AquaCal 2000 can be locked. To and together. Enter the code '1582' lock or unlock the settings, press and set security to IN to enable or OUT to prohibit setting. If security is IN, the user will be unable to change any settings, although viewing is possible.
selected, no further setting is required. If IN is selected, the base temperature has to be set (20°C or 25°C). The next setting is slope, which is adjustable between 0.0%/°C and 3.9%/°C. Cell constant Press CELL K. The cell constant can be set between 0.00900 and 0.01100 0.01000 ± 10%). Only the last four digits are adjustable. If an illegal setting is attempted (e.g. 0.01200), the last legal setting will be retained and displayed. Output Press OUTPUT. This allows setting of the voltage outputs.
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