EC500 Conductivity Meter Manual
Contents
1. auto range to the proper range and then display the reading Conductivity Conductivity TDS Salinity PH EC500 V2 1 7 13 05 Changing Measurement Function The meter can be set to measure pH Conductivity TDS or Salinity To change the mode 1 Press and Hold the MODE HOLD button for 2 seconds and the display will begin to scroll through the units uS Conductivity pH ppm S Salinity ppm TDS mg I TDS Note The HOLD function cannot be on when changing the measurement function If HOLD is displayed in the lower left corner of the display briefly press the MODE HOLD button to turn it off 2 When the desired units are displayed release the MODE HOLD button TDS Compensation Ratio The TDS value is determined by multiplying a conductivity reading by a known ratio factor The meter allows for selecting a conversion ratio in the range of 0 4 to 1 0 The ratio varies with the application but is typically set between 0 5 and 0 7 Note The stored ratio will briefly appear in the lower temperature display when the meter is first turned on or when changing measurement function to TDS Note In the Salinity mode the ratio is fixed at 0 5 To change the ratio while in the TDS measurement mode ppm or mg l 1 Press and release the CAL RECALL button twice in succession The stored ratio will appear in the display oN 2 Press the MODE HOLD button to i2. 3 EC500 V2 1 7 13 05 Meter Description Front Panel Description N QaPpon Battery compartment cover LCD Display MODE HOLD button CAL RECALL button ON OFF button Electrode Collar pH Conductivity Electrode Note The Electrode cap is not shown LCD Display ou 1 Bargraph display 2 Measurement units 3 4 Range calibration and Main display low battery indicators Temperature display Renew indicator Reading hold indicator wa ONG 2 gt 2 PP mS mg L 29 20 CUI Oooo 5 Q BAT 6 RENEW ci ci boh hal pH T gt HOLD 7 l m o hl F EC500 V2 1 7 13 05 Measurement Procedure Sample Preparation 1 2 For pH place the tip of the electrode in the sample or make contact with a wet surface Measurement 1 Press the ON button G49 and then SELF CAL will appear in the display during the turn on diagnostics 2 Depress and hold the MODE HOLD key to scroll to the desired measurement mode 3 Insert the electrode into the sample making sure that the electrodes are completely submersed 4 Slowly stir the solution with the electrode to remove air bubbles if in the Conductivity TDS or Salinity mode 5 Ifin the Conductivity TDS or Salinity modes the meter will For Conductivity TDS or Salinity place the test sample in a sample cup with enough depth 2 5cm minimum to cover the electrode Stir the solution to remove any air bubbles
3. power on period for all three range calibration symbols to appear Note The meter allows for a 1 2 or 3 point calibration If calibration is done for more than one point the lowest value standard should be done first to obtain the best accuracy Considerations and Techniques Do not touch the inner surfaces of the conductivity electrodes Touching the surface of the platinized electodes may damage and reduce the life of the probe Store the electrode in the wetting cap with the sponge moistened with pH 4 01 buffer solution e Always rinse the electrode in de ionized water between measurements to avoid cross contamination of the sample Double rinsing is recommended when high accuracy is required e Periodically accumulated salt deposits from the reference electrode may build up in the storage cap and should be rinsed away These deposits could affect measured values of low conductivity samples e When measuring low conductivity samples extra care is recommended in rinsing the probe to avoid contamination of the sample with electrolyte from the pH reference electrode This will only be a factor when measuring in the low range and can be further minimized by increasing the volume of the sample Example Try a 200 to 500 mL sample If the 20mL sample cup is to be used then the electrode should not be allowed to sit in the sample for any longer than necessary to avoid electrolyte leakage into the sample raising the conducti
4. Clogged or contaminated reference junction Clean junction see cleaning instructions Unit will not calibrate in pH Damaged or worn out sensing membrane Replace electrode see reorder information Unit will not calibrate in pH Contaminated pH buffers Use fresh buffers Unit will not calibrate in conductivity mode Contaminated conductivity standards Use fresh standards Unit will not calibrate in conductivity mode Dirty probe Clean conductivity probe See cleaning instructions Unit will not calibrate in conductivity mode Damaged conductivity probe Replace electrode see reorder information Unit will not calibrate in conductivity mode Trapped air bubbles Tap or stir to release air bubbles Unit will not turn on Batteries are low or dead Replace batteries Unit will not turn on Batteries installed with incorrect polarity Replace batteries observe polarity RENEW message pH sensor needs recalibration Recalibrate unit Use fresh buffers RENEW message pH sensor slope has fallen below acceptable limits Replace electrode see reorder information Unit will not respond to any key presses Internal fault Perform hard reboot Remove batteries hold ON OFF switch down for 5 seconds replace batteries Lamy a4 Support line 781 890 7440 Technical support Extension 200 E mail support extech com R
5. User s Guide EXTE INSTRUMENTS ExStik EC500 pH Conductivity TDS Salinity Temperature Meter CE Introduction Congratulations on your purchase of the ExStik EC500 pH Conductivity Total Dissolved Solids TDS Salinity meter With the EC500 s dynamic cell constant technology it is possible to measure a wide range of Conductivity TDS and Salinity with the same electrode Careful use and maintenance will provide years of reliable service Powering the ExStik The ExStik uses four 4 CR2032 Lithium lon Batteries included If the batteries are weak the BAT indicator appears on the LCD Press the ON OFF key to turn the ExStik on or off The auto power off feature shuts the ExStik off automatically after 10 minutes of inactivity to preserve battery life Getting Started e Remove the cap from the bottom of the ExStik to expose the pH electrode reference junction and conductivity electrodes e Before the first use or after storage soak the electrode in tap water or pH 4 buffer solution for about 10 minutes e White KCL crystals may be present in the cap or on the electrode This is to be expected depending on the length of time in storage These crystals will dissolve while soaking the electrode or they can be rinsed away with tap water e For best results calibrate with pH 7 buffer solution first then calibrate with the buffer solution closest to the expected pH value of t
6. acement of the product The warranty set forth above is inclusive and no other warranty whether written or oral is expressed or implied 2 EC500 V2 1 7 13 05 Specifications Display pH Range pH Accuracy pH ATC Range pH Reference Junction Conductivity ranges TDS ranges Variable ratio Salinity range Fixed ratio of 0 5 TDS Ratio Salinity Ratio Conductivity ATC Temperature Range Temperature Resolution Temperature Accuracy Conductivity ATC Range Accuracy Measurement Storage Low battery indication Power Auto power off Operating conditions Dimensions Weight 2000 count LCD with Bargraph 0 00 to 14 00 0 01 pH typical 0 C to 90 C 32 F to 194 F Permanent gel non refillable 0 to 199 9uS cm 200 to 1999uS cm 2 00 to 19 99mS cm 0 to 99 9ppm or mg L 100 to 999ppm or mg L 1 00 to 9 99ppt or g L 0 to 99 9ppm 100 to 999ppm 1 00 to 9 99ppt 0 4 to 1 0 adjustable 0 5 Fixed 2 0 per C 5 0 C to 90 0 C 23 0 F to 194 F 0 1 up to 99 9 1 gt 100 1 C 1 8 F from 5 to 50 C 23 to 122 F 3 C 5 4 F from 50 to 90 C 122 to 194 F 0 0 C to 60 0 C 32 0 F to 140 F Conductivity 2 full scale TDS 2 full scale Salinity 2 full scale 25 tagged numbered readings BAT appears on the LCD Four 4 CR2032 Lithium lon Batteries After 10 minutes override available 5 C to 50 C 23 F to 122 F 40 x 200 x 40 mm 1 6 x 7 9 x 1 6 93 g 3 3 oz
7. e CAL RECALL key Temperature Units mode then momentarily press the On Off key Release the CAL RECALL key after the Self Cal lights Override Auto On Any measure Momentarily press the CAL RECALL Power Off mode key then simultaneously press and hold the ON OFF amp MODE HOLD key for approximately 2 seconds until oFF is displayed Default Reset OFF n a Simultaneously press ON OFF CAL RECALL and MODE HOLD momentarily dFLt will be displayed 10 EC500 V2 1 7 13 05 Maintenance Battery Replacement 1 Twist off the battery compartment cap 2 Holding the battery housing in place with a finger pull out the battery carrier using the two small tabs 3 Replace the four 4 CR2032 batteries observing polarity 4 Replace the battery compartment cap Electrode Replacement 1 To remove an electrode unscrew and completely remove the electrode collar turn the collar counter clockwise to remove 2 Gently rock the electrode from side to side pulling it downwards until it disconnects from the meter 3 To attach an electrode carefully plug the electrode into the meter socket note that the electrode connector is keyed ensuring proper connection 4 Tighten the electrode collar firmly enough to make a good seal a rubber gasket seals the electrode with the meter 11 EC500 V2 1 7 13 05 Cleaning Recommendations When cleaning the probe take care not to scratch or damage the sensing s
8. epair amp Returns Extension 210 E mail repair extech com Product specifications subject to change without notice For the latest version of this User s Guide Software updates and other up to the minute product information visit our website www extech com Copyright 2005 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form www extech com 13 EC500 V2 1 7 13 05
9. he solution or material to be tested e To preserve the pH electrode life keep the sponge in the protective cap soaked with tap water or pH 4 buffer solution e For best results calibrate for conductivity with a standard in the expected range of the sample For maximum accuracy calibrate from low conductivity value standards to high value standards Warranty EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for one year from date of shipment a six month limited warranty applies to sensors and cables If it should become necessary to return the instrument for service during or beyond the warranty period contact the Customer Service Department at 781 890 7440 ext 210 for authorization or visit our website www extech com for contact information A Return Authorization RA number must be issued before any product is returned to Extech The sender is responsible for shipping charges freight insurance and proper packaging to prevent damage in transit This warranty does not apply to defects resulting from action of the user such as misuse improper wiring operation outside of specification improper maintenance or repair or unauthorized modification Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct indirect incidental or consequential damages Extech s total liability is limited to repair or repl
10. ill return to normal operation after displaying End Clear Stored Memory With the unit on press and hold ON OFF for 4 seconds clr will be briefly displayed when the memory is cleared Changing Temperature Units To change the displayed temperature units C or F 1 With the unit OFF press and hold down the CAL RECALL button 2 With the CAL RECALL button depressed momentarily press the ON OFF button When SELF CAL appears in the display release the CAL RECALL button The unit will power on with temperature displayed in the new units Data Hold Mode Press the MODE HOLD button to hold freeze a reading in the display The meter will enter the HOLD mode and the HOLD indicator will appear Note This also stores the reading Press the MODE HOLD button again to return to normal operation Auto Power OFF The auto power off feature automatically shuts the meter off 10 minutes after the most recent button press Auto Power OFF Disengage Feature To disable the Auto Power Off feature 1 Turn the unit on 2 Press CAL RECALL once Quickly 3 Immediately and simultaneously press the MODE HOLD and ON OFF buttons for approximately 2 seconds until oFF is briefly displayed To disengage this feature turn the unit off with the ON OFF button The next time the unit is powered up Auto Power OFF mode will be engaged again Low Battery Indication When the batteries become weak the BAT icon will appear
11. in the display Refer to the Maintenance section for battery replacement information 7 EC500 V2 1 7 13 05 Calibration pH 1 2 or 3 points 1 6 Place the electrode into a buffer solution 4 7 or 10 Press and hold the CAL RECALL key until CAL appears in the lower temp display When doing a 2 or 3 point calibration calibrate with pH 7 buffer first then follow with pH 4 then the pH 10 buffer The ExStik automatically recognizes the solution and calibrates itself to that value the circled number on the LCD will match the solution Note that if the solution is more than 1 pH unit off from the L 4 M 7 or H 10 pH buffer or if the electrode slope is low the ExStik will assume an error and abort the calibration End will be displayed and the unit will return to measure mode During calibration the pH reading flashes on the main display When calibration is complete the ExStik automatically displays SA then END and returns to normal operation mode The appropriate circled indicator L M or H appears on the LCD when a particular calibration or series of calibrations has been completed within one power on cycle When the ExStik is turned off the circled indicator configuration and the calibration data will be retained For a two or three point calibration repeat steps 1 4 CAL Reminder Display When in pH measurement mode a CAL icon will appear after 15 on off cycles of the mete
12. m 1413uS cm or 12 88mS cm 12 880uS cm are used for the automatic calibration recognition procedure No other calibration values are permitted Calibration is always done in conductivity mode Since salinity and TDS values are calculated from conductivity values this procedure also calibrates the salinity and TDS ranges 1 Fill a sample cup with the standardizing solution 2 Turn the meter ON and insert the electrode into the solution Tap or move the electrode in the sample to dislodge any air bubbles 3 Press and hold the CAL RECALL button approximately 2 seconds until CAL appears in the lower temp display The main display will start flashing 4 The meter will automatically recognize and calibrate to the standardizing solution The display will briefly indicate SA End and then return to the measurement mode after a calibration Note The SA will not appear if the calibration fails 5 The range calibrated symbol will appear in the display for each range that is calibrated during that power on cycle Low range 84uS cm Medium range 1413uS cm High range 12 88mS cm 12 880uS cm Note Each time the calibration mode is entered all calibration symbols on the display are cleared but only the calibration data for the currently calibrated range is replaced The other two ranges keep the existing calibration data just the symbols are removed Calibration of all three ranges must be performed during one
13. ncrease the ratio value in steps of m 0 1 st 3 When the desired ratio is displayed press and release the CAL RECALL button to store the value and return to the normal td5 mode 4 If no buttons are pressed for 5 seconds the meter returns to measure mode Storing Readings 1 Press the MODE HOLD button to store a reading The storage location number will be displayed on the lower display while the ETTR main display shows the stored reading The meter will enter the E S s HOLD mode and the HOLD indicator will appear wc 2 Press the MODE HOLD button again to exit the HOLD mode and pm 1 m pu return to normal operation 3 If more than 25 readings are stored previously stored readings HOU z starting with number 1 will be overwritten 6 EC500 V2 1 7 13 05 Recalling Stored Readings 1 Press the CAL RECALL button and then press the MODE HOLD button A location number 1 through 25 will briefly appear and then the value stored in that location will appear The displayed units will flash indicating that the storage recall mode is active i5 gt 429 195 2 The last stored reading will be displayed first Pressing and releasing the MODE HOLD button will scroll through the stored readings one at a time The location number is displayed first followed by the reading stored in that location 3 To exit the storage mode press the CAL RECALL button and the meter w
14. r without performing a calibration The CAL display is simply a reminder to calibrate pH and will turn off when the pH electrode is recalibrated The reminder does not affect function in any way RENEW Display A flashing RENEW warning indicates that the probe is not performing to expected specifications If cleaning and recalibration does not cause the RENEW icon to disappear replace the probe see optional accessories on the last page of this manual The RENEW display appears as a result of the pH electrode slope falling below 70 of a nominal slope Measurement and Display Considerations If the unit appears to be locked display frozen It is possible that the Data Hold mode has been inadvertently accessed by pressing the MODE HOLD button HOLD will be displayed in the bottom left of the LCD Simply press the MODE HOLD button again or turn the meter off and then on For maximum accuracy allow sufficient time for the temperature of the probe to reach the temperature of the sample before calibrating This will be indicated by a stable temperature reading on the display 8 EC500 V2 1 7 13 05 Calibration Conductivity Meter accuracy verification should be performed on a periodic basis Once per month is the recommended cycle for normal use If calibration is required a conductivity standardizing solution must be obtained The meter can be calibrated in any or all of the three ranges Standardizing solutions of 84uS c
15. urface or the platinized electrode surfaces Contaminant Cleaning Solution Instructions Water soluble substances Deionized water Soak or scrub with a soft brush Recondition in 4 or 7 buffer for 1 hour Grease amp Oil Warm water and household detergent Soak or scrub with a soft brush maximum of 10 minutes Rinse thoroughly with DI water recondition in 4 or 7 buffer for 1 hour Heavy grease amp Oil Alcohol Maximum of 5 minute soak scrub with a soft brush Rinse thoroughly with DI water recondition in 4 or 7 buffer for 1 hour Lime and hydroxide coatings 10 acetic acid Soak until coating dissolved maximum of 5 minutes Rinse thoroughly with DI water recondition in 4 or 7 buffer for 1 hour Please Note Since the EC500 does not have a refillable reference electrolyte chamber it is important not to soak the electrode in the above solutions for more than the recommended times To do so may cause a reference potential shift which will cause degradation in performance or failure 12 EC500 V2 1 7 13 05 Troubleshooting Problem Possible Cause Action Reading is frozen Unit is in HOLD mode Press MODE HOLD key to exit HOLD mode BAT message Batteries are low Replace batteries Unit will not calibrate in pH Low pH slope Replace electrode see reorder information Unit will not calibrate in pH
16. vity value 9 EC500 V2 1 7 13 05 Operational Matrix Function Power Mode Required Key Press Sequence Resulting Action Status Setting On Off On or Off Any Momentary press of the On Off key Calibration On pH or Press amp hold CAL RECALL key for 2 Conductivity seconds until it enters CAL function Store Reading On Any measure Momentary press of the mode MODE HOLD key Hold Release On While In Hold Momentary press of the Mode MODE HOLD key Enter Memory On Any measure Momentary press of the Retrieval mode CAL RECALL key followed by a momentary press of the MODE HOLD key Within 4 seconds Scroll Stored On Memory Momentary press of the Readings Recall MODE HOLD key Displays last in first out Exit Memory On Memory Momentary press of the Retrieval Recall CAL RECALL key Clear Stored On Any Measure Press and hold the On Off key for 4 Memory Mode seconds until Clr is displayed Change On Any Press and hold the MODE HOLD key Measurement Mode for at least 2 seconds the modes will scroll by until the key is released Enter Cond TDS On TDS ppm or Press and release the CAL RECALL Ratio mg l key twice in quick succession Change Cond TDS On TDS ratio Momentary press of the Ratio MODE HOLD key each key press increases the ratio by 0 1 the value cycles from 0 4 1 0 Exit Cond TDS On TDS ratio Momentary press of the Ratio CAL RECALL key Change Off n a off Press and hold th
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