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Page 2: ...SELECT BUFFER until display matches first buffer value Press ENTER and wait until the large number display stops flashing When complete meter will display the next stored buffer value 2PT will be displayed 9 10 11 12 Rinse probe in deionized water and place in second calibrating buffer If necessary press SELECT BUFFER until display matches second buffer value Press ENTER and wait until the large n...
Page 3: ... at a time The meter automatically identifies which type of electrode is attached when the meter is turned on If both ISFET and BNC probes are attached at the same time errors may occur Always turn off the meter when changing electrodes ESTIMATED LIFE OF AN ISFET SENSOR pH PROBE Depending upon the application the expected life of an ISFET probe is approximately 18 months The reference electrode co...
Page 4: ...2 Manual Temperature Compensation 13 mV Measurement 14 Temperature Measurement 14 Cleaning and Reconditioning ISFET Probes 15 Cleaning with Detergent 15 Reconditioning with Warm Buffer 15 Cleaning with Alcohol or Methanol 16 Cleaning with Sodium Hypochlorite 16 Cleaning and Reconditioning BNC Electrodes 17 Cleaning with Detergent 17 Reconditioning with Warm Buffer 17 Cleaning with Acid 17 Cleaning...
Page 5: ...nized rinse solution DO Use buffer solutions with pHvalues no greater than three pH units apart Buffers should bracket the anticipated values of the samples to be measured DO Choose buffer solutions that most closely mimic the chemical nature and conductivity level of the sample solutions to be measured DO Use deionized water to rinse residual buffer and sample solutions from the probe after calib...
Page 6: ...dings in direct sunlight Direct sunlight may cause unstable readings or difficulty in calibration Call IQ Scientific Instruments or your Authorized Dealer for optional light shields DO NOT use the probe in an environmentthat will damage the pH sensor such as hydrofluoric acid or abrasive samples DO NOT use the probe in environments that will damage the epoxy materials used in probe construction su...
Page 7: ...SFET Probe Indicator PROBE is displayed when pH meter has detected the presence of an ISFET probe The PROBE icon is not displayed when the pH meter is using a BNC electrode Flashing PROBE icon indicates pending ISFET probe failure 7 One Point Calibration Mode Indicator 1PT is displayed when the meter is set for making a one point calibration 8 Two Point Calibration Mode Indicator 2PT is displayed ...
Page 8: ...V mode TEMP Selects Temperature mode Repeatedly pressing TEMP toggles between o C and o F CAL Selects the Calibration mode SELECT Scrolls through calibration buffer values BUFFER CAL and SELECT BUFFER keys Used to manually set temperature compensation ENTER Used to confirm a displayed buffer value and begin calibration Used to set manual temperature compensation value ...
Page 9: ... so a separate temperature probe is not required 2 Temperature Probe Connector for use with BNC Electrodes The temperature probe uses a 3 5 mm phono jack When a temperature probe is connected the meter will Automatically Temperature Compensate ATC pH values Use only 30KÙ thermistors Contact IQ Scientific Instruments for temperature probes or pH electrodes with built in temperature sensors 3 BNC Co...
Page 10: ... new or has not been in regular use soaking the probe in pH 7 00 buffer for at least 5 minutes is recommended For best accuracy when working at non ambient temperatures allow the probe to equilibrate to the temperature of the buffer or sample solution before starting calibration or pH measurement Erroneous readings will occur if the meter is incorrectly calibrated e g setting the Buffer Value to p...
Page 11: ...be be sure PROBE icon is displayed 5 If necessary press pH mV until pH is displayed 6 Press CAL 7 Meter will default to pH 7 00 buffer If the display does not match the pH of the buffer press SELECT BUFFER until display matches first buffer solution pH The 1 PT icon will be displayed 8 Press ENTER The pH buffer value will begin flashing to indicate calibration is underway Wait until the large disp...
Page 12: ...e Buffer Remember One point calibration is recommended only if the sample pH is very close to the calibration buffer pH and an accuracy of 0 1 pH is acceptable It is highly recommended that each pH measuring session begin with a two point calibration 1 Follow steps 1 through 8 of the Calibration with Two Buffers procedure 2 Press the pH mV key to exit calibration mode after the first calibration p...
Page 13: ...attached when using a BNC electrode automatic temperature compensation is disabled and the meter temperature display will default to 25o C The table below shows the pH values of buffers at various temperatures Nominal Value 25 o C 0 o C 5 o C 10 o C 20 o C 30 o C 40 o C 50 o C 1 68 1 67 1 67 1 67 1 67 1 68 1 69 1 71 4 01 4 00 4 00 4 00 4 00 4 01 4 03 4 06 6 86 6 98 6 95 6 92 6 87 6 85 6 84 6 83 7 ...
Page 14: ...nter temperature mode Repeatedly pressing the TEMP key toggles between o C and o F 5 Press CAL to enter manual temperature compensation mode 6 Press CAL key or SELECT BUFFER key to manually set temperature The default temperature value is 25 o C 7 Press ENTER to store temperature value 8 Press pH mV to exit manual temperature compensation mode 9 Calibrate the pH meter following the directions in t...
Page 15: ...e 1 Connect ISFET pH probe with built in temperature sensor or if using a BNC electrode connect a temperature probe to the 3 5 mm phono receptacle 2 Press ON OFF to turn on meter 3 Press TEMP to place meter in temperature mode The display shows the current temperature reading 4 Pressing TEMP toggles between o C and o F When displaying temperature in Centigrade the o C icon will be displayed Rememb...
Page 16: ...T probes are designed to be stored dry and have a virtually unlimited shelf life however an extended period of dry storage can crystallize the KCl gel at the reference junction Heat pH 7 00 buffer to between 45 o C and 60 o C 115 o F and 140 o F Soak the probe for 2 minutes Place the probe in room temperature pH 7 00 buffer and allow to cool CAUTION Do not use the probe as a thermometer to determi...
Page 17: ...dium Hypochlorite Bleach If the ISFET probe has been exposed to fat or protein the response time may begin to slow Soak the probe for five minutes in a 10 1 dilution of deionized water to household bleach 0 5 solution of sodium hypochlorite Brush with a soft bristle brush or toothbrush to remove deposits The sensor is slightly recessed be sure to make gentle contact with the sensor surface Rinse w...
Page 18: ...nce the reference can be reconditioned by soaking in 60 o C 140 o F pH 4 00 buffer with added KCl for ten minutes Place the probe in room temperature electrode soak solution pH 4 00 buffer with added KCl and allow it to soak for 30 minutes Cleaning with Acid Soak the BNC probe for 30 minutes in 0 1 molar HCl about a 100 1 dilution of distilled water to 37 hydrochloric acid Rinse well then soak in ...
Page 19: ...sluggish after trying other cleaning methods immerse electrode tip in 0 1M NH4HF2 ammonium biflouride for one minute This is a solution of about 5 7 grams ammonium biflouride to 1 liter of distilled water This will etch the surface of the glass and may restore performance Rinse well with deionized water Soak the probe overnight in pH 4 00 buffer CAUTION This solution is extremely hazardous Protect...
Page 20: ...toff If the meter is on battery power and no key is pressed for 12 hours the meter will turn off automatically Calibration is retained in memory after shutoff If the meter is operating on battery power and an error message is displayed for 20 minutes the meter will turn off automatically If the meter is operating on AC power it will not automatically turn off AC Power Adapter The IQ150 pH meter ca...
Page 21: ...n probe cable connector and on meter with methanol and a cotton swab and let dry completely Reconnect probe to meter Reference junction not flowing Follow warm buffer cleaning procedure ISFET probe not properly hydrated Soak probe for at least five minutes in neutral buffer pH 7 00 Interference from other devices Remove other devices from solution Unplug water baths stirrers etc Interference from ...
Page 22: ...from sunlight If trouble persists probe may have reached the end of its useful life and may need to be replaced Replace probe Meter continually displays 14 00 or 0 00 with electrode attached Presence of ISFET probe not detected by meter or probe If using an ISFET probe be sure that the PROBE icon is displayed If not displayed turn off the meter disconnect and then reconnect the probe Be sure to li...
Page 23: ...ttery power only If E01 persists meter requires repair E02 This error code is displayed after the meter is turned on if any probe malfunction is detected Turn the meter off Disconnect and then reconnect the probe Turn meter back on Clean probe and meter contacts with methanol and a cotton swab and let dry completely If E02 persists probe requires replacement E03 BNC electrode offset error E03 is d...
Page 24: ...n sensor and recalibrate If you are confident that the buffer is correct override E05 by pressing the CAL key E06 ISFET slope out of range Follow the cleaning instructions Calibration error Carefully follow the two point calibration instructions Damaged probe If problem persists replace probe E07 ISFET offset out of range Stir the probe in solution to remove any air bubble trapped on the sensor su...
Page 25: ...ne techsupport phmeters com www phmeters com IQ Scientific Instruments Inc 2075 E Corte del Nogal Carlsbad CA 92009 US Canada 800 276 0723 Telephone 760 930 6501 Fax 760 930 0615 Revision 6 0 1998 2004 IQ Scientific Instruments Inc ...
