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Related Manuals for Extech Instruments 407227
Summary of Contents for Extech Instruments 407227
- Page 1 USER MANUAL Heavy Duty pH and ORP Meter Model 407227 Meter and 407728 Kit...
- Page 2 Introduction Thank you for selecting the Extech Model 407227 pH, mV, and Temperature Meter. This device measures pH, mV (ORP), and Temperature. The temperature units (C/F) are selectable and the Calibration and Slope adjustments are conveniently located on the front panel.
- Page 3 Meter Description 1. BNC connector for pH or optional ORP probe 2. RS-232 PC interface jack 3. LCD display 4. pH electrode 5. Calibration and slope adjustment potentiometers 6. Temperature probe jack 7. LCD contrast adjustment 8. Keypad: POWER: Press to turn the meter ON or OFF HOLD: Press to freeze/unfreeze the displayed reading C/F: Press to select the desired unit of measure for temperature RECORD: Press to track the MAX, MIN, and AVG readings...
- Page 4 Temperature Compensation For accurate pH measurements and calibration, the temperature of the solution under test must be known. This can be accomplished manually or automatically. Refer to the steps for each, below, and determine the best method for the application. Automatic Temperature Compensation For Automatic compensation, use the supplied thermometer.
- Page 5 pH Operation Important note: Manual or Automatic Temperature compensation must be engaged before proceeding with pH calibration and pH measurements. pH CALIBRATION Note: It is recommended that the meter be calibrated at least once per day. 1. Connect the pH electrode to the meter’s BNC input jack and rinse it with distilled water.
- Page 6 ORP Operation (mV) Connect the optional (67500B) mV ORP electrode to the BNC input jack at the top of the meter. Turn the meter ON using the POWER button. Select ‘mV’ (millivolts) via the meter’s front panel slide-switch. Rinse the ORP probe in distilled water. Place the electrode in the test solution and read the millivolt (ORP) value.
- Page 7 Battery Replacement The low battery indicator (LBT) appears when the 9V battery needs replacing. 1. Remove the meter's protective jacket. 2. Open the battery compartment using a coin or screwdriver. 3. Replace the 9V battery and re-assemble. Never dispose of used batteries or rechargeable batteries in household waste.
- Page 8 Specifications General Specifications Display Dual function LCD with contrast adjust Input impedance ohms Temp. compensation for pH Automatic and manual 0 ~ 65°C (32 ~ 149°F) pH electrode compatibility Any pH electrode with BNC connector Data hold Freezes displayed reading Memory recall Records / Recalls MAX (maximum), MIN (minimum), and AVG (average) readings...
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