pH Measurements Press the POWER button to turn the meter ON (the meter will cycle through a self‐check). Press the MODE/CAL button until the PH icon switches on. Press the UNIT/SET button to select ºC or ºF. Connect the pH electrode to the side pH BNC connector. Adjust the ▲▼buttons to match the temperature of the solution (or use the external temperature probe to do so). If required, calibrate the electrode (see pH Calibration). Place the electrode in the sample solution and read the pH value on the display. When all measurements have been taken, unplug the electrode and rinse in distilled water; then shake and store it in the wetting cap with 4.0 M KCL or in a pH 4 buffer solution. Conductivity/TDS/Salt Measurements Press the POWER button to turn the meter ON. Press the MODE/CAL button until the COND, SALT or TDS icon is displayed. Connect the conductivity electrode to the side conductivity connector. If required, calibrate the electrode (see Conductivity Calibration). Place the electrode in the sample solution and read the value on the display. When finished, unplug the electrode and rinse in distilled water. ORP (mV) Measurements Press the POWER button to turn the meter ON. Press the MODE/CAL button until the ORP icon is displayed. Connect the ORP electrode to the side ORP BNC connector. Place the electrode in the sample solution and read the mV value on the display. When all measurements have been taken, unplug the electrode and rinse in distilled water. Store the probe tip in the wetting cap in a 4.0 M KCL or in a pH 4 buffer solution. 341350A-en-US_V1.3 8/15 GlobalScientificSupply GLOBAL SCIENTIFIC SUPPLY info@GlobalScientificSupply.co .com The Laboratory Supply Company!
Use the ▼ ▲buttons to scroll through the memory locations and to view the stored data. Momentarily press the STORE/RECALL button to exit the Recall Readings mode. End will appear in the display; the meter will then return to the normal measurement mode. Clearing the memory With the meter on, press and hold the ▼ and ▲ buttons for 2 seconds. The CLr icon will appear on the display, indicating that the memory has been erased. Temperature Units Press the UNIT button to select ºF or ºC. Manual Temperature Compensation In the pH mode, the solution temperature can be measured and set by using the optional external temperature probe or, when the probe is not used, by adjusting the temperature display. Press the ▲▼buttons to set the temperature when the MTC icon is displayed. The Conductivity probe has a built‐in temperature sensor so manual temperature compensation does not apply for Conductivity measurements. Auto Power off (APO) The meter is equipped with an Automatic Power Off feature. The meter will power down after a 10‐minute period of inactivity. This feature can be disabled by pressing and holding the POWER button for 2 seconds (the APO display icon indicates that this feature is enabled). After disabling APO, the next time the meter is powered up APO will be re‐enabled. Reset to Default settings The meter can be reset to its factory default configuration: With the meter OFF, press and hold the POWER and STORE/RECALL buttons simultaneously until dFLt rSt appears in the display. Release the buttons and the meter will continue with a normal startup. Default values include: Calibration values, Conductivity mode, ºC, MTC, APO and RENEW off 341350A-en-US_V1.3 8/15 GlobalScientificSupply GLOBAL SCIENTIFIC SUPPLY info@GlobalScientificSupply.co .com The Laboratory Supply Company!
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If the MTC icon appears next to the temperature display, press the ▼ or ▲ button to set the temperature of the pH buffer. If the optional temperature probe is used, insert the probe into the buffer solution. Press and HOLD the MODE/CAL button until the display begins to flash ‘7.00’. The meter automatically recognizes the buffer and calibrates itself to that value. At the end of the calibration cycle, SA and End will briefly appear on the display and the meter will return to the normal operating mode. When a calibration is performed, the calibration icons (pH10) (pH7) (pH4) will be cleared (calibration data is not erased) and will be replaced when a successful calibration is performed for each buffer within one power on cycle. These icons indicate what calibration levels were last performed. They do not indicate how recently the calibration was performed or if the calibrations are still valid. Remove the electrode from the pH7 buffer, rinse in a rinse solution and insert it into the pH4 or pH10 buffer solution. Repeat step 4 for the second calibration point and then the third point if desired. Note: If the output of the electrode falls outside predetermined limits, the meter will cancel the calibration, indicate End, and flash the RENEW icon. This typically happens when the electrode has aged and needs replacement. Note: To avoid cross contamination, always rinse the electrode in a rinse solution, like distilled water, when changing from one buffer or sample to the next buffer or sample. ORP Calibration The ORP electrode does not require calibration. However, you can test the ORP probe’s accuracy using an ORP standard. 341350A-en-US_V1.3 8/15 GlobalScientificSupply GLOBAL SCIENTIFIC SUPPLY info@GlobalScientificSupply.co .com The Laboratory Supply Company!
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Press and hold the MODE/CAL button (approximately 2 seconds) until the main display starts flashing. The meter will automatically recognize and calibrate to the standardizing solution. At the end of the calibration, the display will briefly indicate “SA”, “End” and then return to the measurement mode. Note: The “SA” will not appear if the calibration fails. The “range calibrated” alert will appear in the display for each range that is calibrated during that power on cycle. Low range, 84µS/cm Medium range, 1413µS/cm High range, 12.88mS/cm (12,880µS/cm) Note: The meter allows for a 1, 2 or 3 point calibration. If calibration is done for more than one point, the lowest value standard should be done first to obtain the best accuracy. Temperature (pH and Conductivity) Offset Calibration This procedure allows for error correction of the external temperature probe (pH) or the conductivity probe’s built‐in temperature sensor. Switch to pH or Conductivity (Salt/TDS) mode. Place the temperature probe or conductivity cell in the sample and allow the temperature reading to stabilize. Press and hold the UNIT/SET button until the ºC or ºF icon begins flashing. Adjust the ▼ or ▲ buttons to set the display to indicate the known temperature of the sample. Momentarily press the UNIT/SET button to save the change and return to the measurement mode. 341350A-en-US_V1.3 8/15 GlobalScientificSupply GLOBAL SCIENTIFIC SUPPLY info@GlobalScientificSupply.co .com The Laboratory Supply Company!
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Samples have low ionic strength For each 50 ml of sample add 1 drop display (lacks salt); e.g. distilled, de‐ionized, (50uL) of SAT.KCL No alteration in pH boiled, lake water (high pressure) will occur by inert KCL. Notes on pH measurements and electrodes The Electrode should be stored in its wetting cap until used. Use a pH 4 buffer solution or a 4.0 M KCL solution. If bubbles are seen in the bulb area, hold the electrode by its cap and shake downwards until bubbles are removed. To improve speed of response, vigorously stir the electrode in the sample, buffer, or rinse solution. After exposure to a sample, buffer, or rinse solution, shake the electrode with a snap motion to remove residual drops of solution. When possible, use part of the next sample/buffer to be measured as a rinse solution,. Keep buffers and samples at the same temperature to avoid temperature effects. pH readings stabilize faster in some solutions than others; allow time to stabilize. Electrodes deteriorate over time. If accuracy falls to 10% the electrode should be cleaned. If no improvement is observed, replace the electrode. Notes on the Conductivity/TDS/Salt Cell Cell Storage: On sheathed cells, replace the sheath over the cell when storing. For non‐ sheathed versions, soak the cell tip in de‐ionized water for storage. Cell Cleaning: After each use, the cell tip should be rinsed with de‐ionized water. If solids build up inside the cell carefully remove with a cotton swab soaked in solvent taking care not to touch the metal parts of the inner cell. 341350A-en-US_V1.3 8/15 GlobalScientificSupply GLOBAL SCIENTIFIC SUPPLY info@GlobalScientificSupply.co .com The Laboratory Supply Company!
TDS conversion ratio 0.67 (fixed) Salinity conversion ratio 0.5 (fixed) Auto Power OFF After 10 minutes of inactivity (can be disabled) Over range indication “OL” Operating Temperature 41ºF to 104ºF (5ºC to 40ºC) Storage Temperature ‐4ºF to 140ºF (‐20ºC to 60ºC) Operating Humidity Max 80% up to 87ºF (31ºC) decreasing linearly to 50% at 104ºF (40ºC) Storage Humidity <80% Operating Altitude 7000’ (2000m) maximum Power 9V alkaline battery or AC adapter Dimensions 4.7 x 3.8 x 1.8” (118 x 96 x 45mm) with meter closed Weight 12oz. (340g) 341350A-en-US_V1.3 8/15 GlobalScientificSupply GLOBAL SCIENTIFIC SUPPLY info@GlobalScientificSupply.co .com The Laboratory Supply Company!
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