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Elcometer 138 Operating Instructions Manual
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Elcometer 138 Operating Instructions Manual

Elcometer 138 Operating Instructions Manual

Elcometer 138
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Elcometer 138
Conductivity Meter
Operating Instructions

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Summary of Contents for Elcometer 138

  • Page 1 Elcometer 138 Conductivity Meter Operating Instructions...
  • Page 2 Elcometer Limited. All other trademarks acknowledged. Material Safety Data Sheets for the Elcometer 138 Calibration Standard Solutions are available to download via our website: 1.41 mS/cm Calibration Solution: www.elcometer.com/images/MSDS/elcometer_138_b771_calibration_solution.pdf.
  • Page 3 CONTENTS Section Page About your gauge ..............2 Controls and display.
  • Page 4 Our products cover all aspects of coating inspection, from development through application to post application inspection. Your Elcometer 138 Conductivity Meter is a world beating product. With the purchase of this product you now have access to the worldwide service and support network of Elcometer. For more information visit our website at www.elcometer.com...
  • Page 5 These operating instructions complement the operating instructions supplied with the Elcometer 138 Bresle Patch Kit and contains additional instructions not included in the Elcometer 138 Bresle Patch Kit Operating instructions. The Elcometer 138 Conductivity Meter measures the conductivity of aqueous solutions. The meter is not designed to measure solids, organic solvents, surfactant, oil, adhesive, alcohol, strong acids (pH: 0 to 2) or strong alkalis (pH: 12 to 14).
  • Page 6 The Elcometer 138 Conductivity Meter is packed in a cardboard and foam package. Please ensure that this packaging is disposed of in an environmentally sensitive manner. Consult your local Environmental Authority for further guidance. To maximise the benefits of this instrument please take some time to read these Operating Instructions.
  • Page 7 GUIDE TO CONDUCTIVITY METER & DISPLAY INDICATORS Place a liquid sample in this cell to measure it with the electrode Measurement Cell located on the bottom of the cell. Protection cover Protects the measurement cell and flat sensor in storage. Lithium batteries CR2032 x 2.
  • Page 8 Stability icon Illuminates when measured value is stabilised. Measured value display Displays a measured, set and status value. A unit symbol illuminates corresponding to the value displayed on the measured value display (14). For conductivity measurement, ‘S/cm’ or Measurement unit ‘S/m’...
  • Page 9 • Do not leave the meter in direct sunlight. 3.1 FITTING BATTERIES The Elcometer 138 Conductivity Meter and Sensor uses dry cell batteries only. Two CR2032 lithium batteries are supplied in the kit. To fit or replace the batteries: 1. Place batteries in the battery clips ensuring correct polarity.
  • Page 10 3.2 ATTACHING & DETACHING THE SENSOR Turn OFF the meter before attaching/detaching the sensor. If the meter is turned ON with the sensor detached, the battery alarm may illuminate. In this case, turn the meter OFF and attach the sensor, and then turn the meter ON again.
  • Page 11 Note: Ensure that the sensor tongue is outside the meter case. If the tongue is inserted between the case and the connector of the meter, it may damage the connector. Correct procedure for closing meter after removal of the sensor When removing the sensor, do not let any water penetrate the inside of the meter.
  • Page 12 4 CALIBRATION 4.1 ABOUT CALIBRATION Calibration points: The following 2-type calibrations are available: • One-point calibration: calibration at 1.41 mS/cm • Two-point calibration: calibration at 1.41 mS/cm and 12.9 mS/cm (solution sold separately) One-point calibration mode is set in the instrument by default. Refer to Calibration Setting Point on page 18. The calibration point setting and calibration result are saved after the meter is turned OFF.
  • Page 13 • Put an appropriate amount of the standard solution or test sample into the measurement cell avoiding the inclusion of bubbles. Bubbles in the solution may cause the conductivity measurement to be inaccurate. Solution Cross-Section of the measurement cell • continues to flash and the Err (error message) is displayed, the calibration has failed.
  • Page 14 4.3 ONE-POINT CALIBRATION 1. To set ‘One-point calibration’, see 5.4 “One-Point Calibration” on page 18. 2. Open the protection cover and put some drops of the 1.41 mS/cm standard solution into the measurement cell. Washing the sensor with standard solution beforehand may provide more accurate calibration.
  • Page 15 flash and the calibration value is displayed. After the calibration is completed, stop flashing and illuminate constantly. 4. After the calibration for 1.41 mS/cm is completed, open the protection cover and remove the 1.41 mS/cm standard solution and remove the moisture.
  • Page 16 5 MEASUREMENT 5.1 SAMPLE METHODS The following sampling methods are available. • Drop: for a small amount of sample - this is the preferred method for these tests. • Immersion: for a large amount sample. • Scooping: for sampling part of a sample. Note: Although this product is waterproof, avoid immersing it completely.
  • Page 17 Drop 1. Open the protection cover. Protection Cover 2. Put some drops of sample into the measurement cell. Immersion 1. Open the protection cover. 2. Immerse the sensor into the sample and stir gently 2 or 3 times.
  • Page 18 Scooping 1. Open the protection cover. 2. Immerse the sensor into the sample and stir gently 2 or 3 times and then scoop up some of the sample with the sensor. 3. Place the meter flat and confirm that the sample is in the measurement cell. 5.2 MEASUREMENT OPERATIONS •...
  • Page 19 • When using the reading locking function (Provides a steady value in the display) 1. Switch the meter on and place some drops of the sample on the sensor. 2. After appears, press the MEAS button for 0.5 seconds. The reading locking function is activated. flashes until the MEAS measured value is stabilised.
  • Page 20 5.4 ONE-POINT CALIBRATION 1. To set ‘One-point calibration’, press and hold the MEAS button for 3 seconds. Press the CAL button until appears. 2. Press the MEAS button again for 0.5 seconds and the calibration type will be displayed (1 or 2). Press the CAL button to change the setting to 1 as required and press MEAS again to apply the setting.
  • Page 21 6 SPECIAL SETTING MODE The special setting mode enables the meter setting and special operations. To enter the special setting mode, press and hold the MEAS button for over 3 seconds in the measurement mode. All the LCD lights illuminate, the meter is now in the special setting mode. •...
  • Page 22 • See 6.3 “Calibration point setting” on page 23. This mode is used to MEAS Switch select the calibration points. CALbutton* MEAS • See 6.4 “Initialisation mode” on page 24. Use this mode to reset the Switch factory default values for all settings and calibration data. CALbutton* MEAS Switch...
  • Page 23 6.1 MEASUREMENT UNIT SETTING Used to select measurement unit. 1. Press and hold the MEAS button for over 3 seconds in the measurement mode to enter the special setting mode. All items appear on the LCD and then the display changes as shown. 2.
  • Page 24 6.2 TEMPERATURE DISPLAY MODE This mode displays the ambient temperature measured with the internal temperature sensor. The measurement accuracy is indeterminate. Use the value only as a guide. 1. Press and hold the MEAS button for over 3 seconds in the measurement mode to enter the special setting mode.
  • Page 25 6.3 CALIBRATION POINT SETTING Used to select the calibration points. 1. Press and hold the MEAS button for over 3 seconds in the measurement mode to enter the special setting mode. All modes appear on the LCD and then the display changes as shown on the right.
  • Page 26 6.4 INITIALISATION MODE All settings and all calibration data are reset to the factory default values. 1. Press and hold the MEAS button for over 3 seconds in the measurement mode to enter the special setting mode. All modes appear on the LCD and then the display changes as shown on the right.
  • Page 27 6.5 SOFTWARE VERSION DISPLAY MODE 1. Press and hold the MEAS button for over 3 seconds in the measurement mode to enter the special setting mode. All modes appear on the LCD and then the display changes as shown on the right.
  • Page 28 The Elcometer 138 Conductivity Meter does not contain any user-serviceable components. In the unlikely event of a fault, the Elcometer 138 Conductivity Meter should be returned to your local Elcometer supplier or directly to Elcometer. The warranty will be invalidated if the instrument has been open.
  • Page 29 9 TECHNICAL SPECIFICATION Measurement principle: 2 AC bipolar method Measurement mode: Conductivity/sodium chloride (NaCl) salinity conversion/TDS (Total Dissolved Solids) conversion Measurement ranges 0 -199 µS/cm ± 5 µS/cm   and Accuracy: 0.2 -1.99 mS/cm ± 0.05 mS/cm 2 -19.9 mS/cm ± 0.5 mS/cm Display: Liquid Crystal Display (LCD) 2½...
  • Page 30 10 SPARE PARTS AND ACCESSORIES The Elcometer 138 Conductivity Meter is complete with all the items required to get started and take measurements, however over the life of the instruments spares and accessories may be required. The following items are available from Elcometer, or your local supplier.
  • Page 31 11 RELATED EQUIPMENT In addition to the Elcometer 138 Bresle Kit and Patches, Elcometer produces a wide range of other equipment for testing and measuring the characteristics of coatings. Users of the Elcometer 138 may also benefit from the following Elcometer products: •...