User manual EUTECH INSTRUMENTS WATERPROOF PHTESTER 102030BNC

[. . . ] A `HOLD' indicator will be displayed and the measurement will be frozen. The `HOLD' indicator will not be displayed anymore indicating the held measurement is released. INSTRUCTION MANUAL pHTestr 10, 20, 30, 10BNC, Spear Large Screen Waterproof pH / Temperature Tester Double Junction Note: All testers have dual display during calibration mode Note: To abort calibration, press the `CAL' button. 4. Allow about 2 minutes for the tester reading to stabilize before pressing the HOLD/ENT button to confirm the first calibration point. The upper display will be calibrated to the pH standard buffer solution and the lower display will then be toggling in between readings of the next pH standard buffer solution. [. . . ] If `nO' is selected, the unit will proceed to the measurement mode without any calibration reset performed. With meter powered off, press CAL and ON/OFF at the same time. After reset, whole LCD segment lits up and goes back to measurement mode. Condition your pHTestr 10, 20, 30 electrodes by immersing it in electrode storage solution or tap water for at least 30 minutes before use. Ensure that your pHSpear electrode is always soaked in the electrode storage solution or tap water via its protective cap. Note: For pHTestr10BNC, please refer to the pH electrode's instruction manual. pH Buffer Set Selection Your tester features USA (pH 4. 01, pH 7. 00 and pH 10. 01) or NIST (pH 4. 01, pH 6. 86, and pH 9. 18) standards. While pressing the HOLD/ENT button, switch on the tester by pressing the ON/OFF button. Press the HOLD/ENT button to confirm the selection of the buffer set. With meter powered off, press HOLD/ENT and ON/OFF at the same time. After buffer selection, whole LCD segment lits up and goes back to measureme nt mode. After the third point calibration, the meter will automatically return to the measurement mode. 1' will be displayed momentarily if the confirmed pH value is not within the pH calibration window. Figure 5: User Reset Sequence Figure 2: Example of pH Calibration Sequence Automatic Temperature Compensation (ATC) ATC feature is available only in pHTestr 10, pH Testr 20 and pH Testr 30. Through its inbuilt temperature sensor, the measurement error due to the changes in electrode sensitivity due to changes in temperature is compensated to give the actual pH reading of the sample measured. pH Testr10BNC and pH Spear has no ATC function and therefore the error should be calculated to derive the actual pH reading of the sample. For these testers, the impact on temperature compensation is 0. 003 pH /°C / pH away from pH 7. For example, if pHSpear is calibrated at room temperature (25 °C) and is measuring sample around pH 4 at around 5 °C. Temperature difference : 25°C - 5°C = 20 °C pH away from neutral : 7pH - 4pH = 3 pH Total error : 0. 003 x 20 x 3 = 0. 18 pH This error value of 0. 18 pH should be taken into consideration to derive the actual pH reading of the sample. pH Measurement Figure 1: Buffer Selection Sequence 1. For pHSpear, pierce the penetrating tip electrode through your semi solid sample as per the desired depth. Rotate left and right several times and tilt to ensure sample contact. If you do not press a button for 8. 5 minutes, the tester will automatically shut off to conserve batteries. Temperature Calibration (Only for pHTestr 30) From the measurement mode, 1. Press the HOLD/ENT button to bring the tester to the `HOLD' mode. Press the CAL button for 3 seconds to switch to the °C or °F mode setting selection screen. Pressing the CAL button continuously for 3 seconds allows you to toggle in between the °C and °F mode setting selection screen. Release the CAL button to confirm your mode selection and the display will go to the temperature calibration mode with the upper display flashing. The upper display shows the current measured temperature reading based on the last set offset and the lower display shows the current measured temperature reading based on factory default calibration. [. . . ] Press HOLD/ENT to increase offset up to +5 °C (+9 °F) from default value. It will roll over to -5 °C (-9 °F) from default value and start increasing again. When the temperature offset value is reached, the new value is automatically confirmed if no key is pressed for 5 seconds. Release CAL button to start entering the new temperature Electrode Replacement You can replace the electrode module at the fraction of the cost of a new tester. When the tester fails to calibrate or gives fluctuating readings in calibration standards, you need to change the electrode. With dry hands, grip the ribbed tester collar with electrode facing you. [. . . ]