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IQ Scientific Instruments IQ240 Instruction Manual

Benchtop / portable ph meter
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  • Page 4: Getting Started--Quick Reference Guide For Two Point Calibration

    MODEL IQ240 pH Meter Getting Started TWO-POINT CALIBRATION--QUICK REFERENCE GUIDE Connect probe to Put probe in first Press ON/OFF to If necessary, press pH until pH status meter. calibrating buffer. turn on meter. indicator arrow points to pH. Status indicator arrow should NOT point to BUFFER.
  • Page 5 INTRODUCTION IMPORTANT NOTICE IF THE METER IS USED IN A MANNER OTHER THAN AS DESCRIBED, THE SAFETY AND PERFORMANCE OF THE METER CAN BE IMPAIRED. This system uses an Ion Sensitive Field Effect Transistor (ISFET) pH sensor. There is no glass to break and the probe should be stored dry. No electrode storage solution is required.

  • Page 6: Table Of Contents

    Table of Contents Getting Started--Quick Reference Guide for Two Point Calibration..Techniques and Tips For Best Performance..... . Display Features and Meter Connections.

  • Page 7: Techniques And Tips For Best Performance

    DO: Be sure the surface of the sensor in the probe is free from any deposits or films. See the cleaning instructions in this manual. DO: Contact IQ Scientific Instruments if your pH testing involves monitoring small pH changes over time (i.e. titrations).
  • Page 8 DO NOT: take readings 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 environment that will damage the pH sensor, such as hydrofluoric acid or abrasive samples.

  • Page 9: Display Features And Meter Connections

    Display Features and Meter Connections Main Display Serial Interface (RS-232) Temperature Display. AC Adapter Connector AUTO HOLD Mode Indicator Recorder Output Status Indicator Arrows Probe Connector Main Display The large digits show the following: Readout of the measured value, either pH or millivolt. Memory address display “AXX”...

  • Page 10: Meter Connections

    Meter Connections RS-232 Standard 9 pin connector for serial output to printer or computer. AC Power Adapter to attach the provided AC adapter. Analog Recorder Output for a chart recorder. Probe Connector Jack for connection of pH probe to meter. Indicates that the meter is in the pH mode.
  • Page 11 2 PT Indicates that two buffer values have been used for calibration. If flashing, second buffer has been selected but not read. 3 PT Indicates that three buffer values have been used for calibration. If flashing, third buffer has been selected but not read.

  • Page 12: Keypad Functions

    Keypad Functions ON/OFF Turns meter ON and OFF. When turned off, the meter retains the calibration in memory. If the meter is on battery power and no key is pressed for 10 hours, the meter will turn off automatically. If the meter is operating on battery power and an error message is displayed for 10 minutes, the meter will turn off automatically.
  • Page 13 SELECT Selects the Select Buffer mode. Repeatedly pressing the SELECT BUFFER key scrolls through Automatic Buffer Recognition values. Selects the Calibration mode. HOLD Selects the Auto Hold mode. When Auto Hold mode is ON, the eye symbol is displayed. When a stable reading is obtained, the display remains locked until the pH key is pressed or the HOLD key is pressed to turn off the Auto Hold function...

  • Page 14: Cleaning And Reconditioning The Probe

    Cleaning and Reconditioning ISFET Probes Cleaning With Detergent Regularly clean the ISFET probe with detergent (a few drops of dish detergent in a cup of warm water). Rinse well with deionized water. ISFET probes can be cleaned with a toothbrush and detergent Reconditioning with Warm Buffer ISFET probes are designed to be stored dry and have a virtually unlimited shelf life;...
  • Page 15 Cleaning With Alcohol or Methanol The ISFET sensor (recessed shiny blue-green spot at the probe tip) can be gently cleaned using alcohol or methanol and a wooden toothpick tipped with a small amount of cotton wool. Be sure that the cotton tip is small enough to actually make contact with the recessed sensor.

  • Page 16: Ph Calibration And Measurement

    Calibration and Measurement Range The IQ240 can measure from pH 0 to 14. Temperature compensation is automatic from -5 C to + 80 C. The meter can perform a one, two or three point calibration using any buffer listed below.

  • Page 17: Calibration With Two Buffers

    SELECT BUFFER until the display matches the first buffer solution pH. The 1 PT status indicator arrow will be flashing. (If using a buffer other than those automatically recognized by the IQ240, refer to Page 17, Changing Stored Automatic Buffer Recognition Values).

  • Page 18: Calibration With Three Buffers

    Rinse the probe in deionized water and place in the second buffer. Stir briefly to remove any bubbles from the sensor surface. Press CAL. 11. The meter will automatically identify the pH of the second buffer solution. If the display does not match the pH of the buffer, press SELECT BUFFER until display matches the second buffer solution pH.

  • Page 19: Calibration With One Buffer

    Auto Buffer Recognition can discriminate between buffers that differ by more than 0.5 pH units. However, closely lying buffers (such as 6.86, 7.00 and 7.41) may not be selected correctly. The IQ240 has storage locations for nine buffer values. The factory default values are 1.68, 4.00, 6.86, 7.00, 7.41, 9.18, 10.01, 11.88, 12.45.

  • Page 20: Automatic Temperature Compensation Of Automatic Buffer

    Automatic Temperature Compensation of Automatic Buffer Recognition Values Factory default Automatic Buffer Recognition values have temperature correction data stored in the meter. The meter displays the nominal buffer value at 25 C. When the calibration is complete, the meter performs the automatic temperature compensation for the actual temperature of the buffer being used (e.g.

  • Page 21: Restoring Automatic Buffer Recognition Values To Factory Default

    Restoring Factory Default Automatic Buffer Recognition Values. Press SELECT BUFFER repeatedly until the display shows the buffer value to be restored to the factory default value. Press CLEAR to clear the displayed value. “Clr” is displayed. Press ENTER to restore the factory default value in memory. mV Measurement Absolute mV Measurement Connect the probe to the meter.

  • Page 22: Titrations

    NOTE: The HOLD function is active in the mV and Relative mV mode. Press the mV key to release the display from a “locked” reading. Titrations Should you wish to use the IQ240 pH meter in a titration application, please contact IQ Scientific Instruments for instructions.

  • Page 23: Storing And Recalling Data

    Storing and Recalling Data The IQ240 can store and recall 20 sample readings (temperature and pH, mV or Relative mV) in memory for later recall. The memory storage addresses are labeled A01 to A20. Storing Sample Readings Follow the instructions to display the desired pH or mV readings.

  • Page 24: Clearing Data From One Storage Address

    Clearing Data from One Storage Address Press STORE/RECALL to place the meter in the Store mode. The status indicator arrow points to “STORE” and the next available storage address is displayed. Press STORE/RECALL again to place the meter in the Recall mode.

  • Page 25: Output Modes

    Output Modes Analog Output An analog signal is sent to the recorder output continuously whenever the meter is in a reading mode. The output is 0.00 mV at pH 7.00 with a slope of -59.16 mV/pH over the range of 0 to 14 pH. The analog output is temperature compensated for the temperature of the sensor.

  • Page 26: Output Of Calibration Data To The Serial Port

    Output the Calibration Data to the Serial Port The calibration data will be automatically sent to the serial port at the end of the calibration process when the pH buffer value stops flashing. Output the Current Sample Reading to the Serial Port With the reading displayed, press ENTER.

  • Page 27: Temperature Calibration

    Temperature Calibration User Temperature Calibration Use the following procedure to calibrate the temperature sensor. NOTE: The Auto HOLD (Auto eye icon) must be off during temperature calibration. Immerse the probe in a solution of known temperature. Press and hold down the ↑ ↑ key and press CAL. The meter enters the temperature calibration mode.

  • Page 28: Battery Replacement

    Battery Replacement A 9v alkaline battery powers the IQ240 meter. The expected battery life is 200 hours of operation. The flashing status indicator arrow on the display indicates low battery voltage. Replace the battery whenever low voltage is indicated. Internal memory is not lost when the battery is replaced.

  • Page 29: Troubleshooting

    Troubleshooting INDICATION CAUSE USER ACTION No Display No Power Replace 9v battery, or use AC power adapter. Press ON/OFF key. Auto Power Off has cleared display Battery status Battery is low Follow the directions for battery indicator arrow replacement on Page 25. flashing The meter is in the See Page 22.
  • Page 30 Unstable reading, pH or temperature Display will show changes in pH (pH status of solution is values due to change in solution indicator does not changing. pH or temperature (meter is automatically temperature stop flashing) Cont. . . compensated to show actual pH at any given temperature).

  • Page 31: Error Codes

    Error Codes INDICATION CAUSE USER ACTION This error code is Turn the meter off. Disconnect, displayed after the then reconnect the probe. meter is turned on Disconnect any cables connected to if any malfunction the RS-232 or analog ports. Turn is detected.
  • Page 32 Error Codes continued. This error code is Carefully follow the two point displayed after a calibration instructions. Use extra calibration error. caution to be sure that the correct One common buffer value is displayed before pressing the ENTER key to begin cause is the operator overriding the calibration.
  • Page 33 For Technical Support On-line: www.pHmeters.com Toll Free (USA and Canada) 1-800-276-0723 Telephone (858) 673-1851 Fax (858) 673-1853 Revision 5.1 © 2001-2004 IQ Scientific Instruments...

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