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Summary of Contents for HM Digital COM-300
- Page 1 COM-300 pH / EC / TDS / TEMP METER Ver2.1E...
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Page 3: Table Of Contents
50% alcohol and a conductivity of at least 10 µS (5 ppm TDS (0.5 scale)). The COM-300 features 2 different conductivity conversion factors to convert EC to TDS using the 0.5 (NaCl) or 0.7 (442TM) as well as selectable modes for measurements in the µS, mS and ppm scales. The meter incorporates automatic temperature compensation (ATC) to accommodate for discrepancies in temperature that would naturally occur. - Page 4 Housing 1. Lanyard hook 2. Battery compartment 3. LCD display 4. Button panel Power/Enter button 6. PH/EC mode, calibration mode, calibration-up button 7. EC/TDS mode, hold, calibration-down button 8. Sensor locking ring 9. Detachable sensor (Part # SP-C3) LCD Display 1.
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Page 5: Taking Measurements
NOTE - The COM-300 is extremely sensitive in low conductivity water (below 50 S). It is not recommended to use this meter in the water below 10 S. If you do use the meter in such water, it is better to test in owing water, or by swirling the meter continuously while obtaining the reading. -
Page 6: Switching Modes
KCl: Potassium Chloride is the international standard to calibrate instruments that measure conductivity. The COM-300 is factory calibrated with a 1413 µS (micro-Siemens) KCl solution. 442™: Developed by the Myron L Co., 442™ simulates the properties of natural water ( rivers, lakes, wells, drinking water, etc.) with a combination of 40% Sodium Bicarbonate, 40% Sodium Sulfate, and 20% Sodium Chloride. - Page 7 EC and TDS readings is 25° Celsius. Without compensation, the EC and TDS readings will increase when the temperature is greater than 25° and decrease when the temperature is lower than 25°. The COM-300 is equipped with Automatic Temperature Compensation (ATC). The meter will automatically adjust the reading to what it would be at 25°.
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Page 8: Ec / Tds Calibration
EC / TDS CALIBRATION The COM-300 is factory calibrated to a 1413 µS KCl solution. The COM-300 will retain its calibration for a very long time, but there may be cases when it is necessary to recalibrate the meter. Additionally, though factory calibration will be suitable for most applications, it may be necessary to recalibrate the meter for more accurate results. -
Page 9: Ph Calibration
CALIBRATION Your COM-300 has been factory calibrated to pH 7.0. While this is suitable for many applications, it is recommended to recalibrate the meter as close as possible to the pH level that will be tested. Recalibrating prior to every test will provide superior results (though this is not required). -
Page 10: Care, Maintenance & Techniques
CARE, MAINTENANCE & TECHNIQUES The COM-300 requires very little maintenance. You may need to change the batteries or clean the unit including the electrodes from time to time. In addition, please note these general techniques: 1. Do not store the unit in high temperature or direct sunlight. -
Page 11: Warranty
Third-party products include, but are not limited to, batteries and ttings. Accessories included, but not limited to, lanyards and product boxes. This manual and all information contained herein copyright HM Digital, Inc. The contents of this manual cannot be reprinted without the permission of HM Digital, Inc. - Page 12 HMDigital.com Ver2.1E...
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