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Summary of Contents for HM Digital COM-100
- Page 1 USER’S GUIDE COM-100 EC / TDS / TEMPERATURE METER...
- Page 2 "accessories" are not covered under warranty. Third-party products include, but are not limited to, 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 3 CARE, MAINTENANCE & TECHNIQUES The COM-100 requires very little maintenance. You may need to change the batteries or clean the unit or 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 4 Care, Maintenance & Techniques…….…………………..……..6 Warranty……………………………………………………………. 7 OVERVIEW Thank you for purchasing HM Digital’s COM-100. The COM-100 is a highly advanced handheld meter that is completely waterproof. The meter measures three parameters: Electrical Conductivity (EC), Total Dissolved Solids 0.7 (442 )or 0.5 (NaCl) factors, as well as selectable modes for measurements in the µS, mS, or ppm scales, making it extremely versatile for a wide range of applications.
- Page 5 COM-100, each has its own non-linear conversion factor: KCl: Potassium Chloride is the international standard to calibrate instruments that measure conductivity. The COM-100 is factory calibrated with a 1413 µS (micro-Siemens) KCl solution. The meter’s default mode is EC-µS.
- Page 6 TAKING MEASUREMENTS The COM-100 can take measurements in Electrical Conductivity (EC), Total Dissolved Solids (TDS) and Temperature. Please make sure to read the Switching Modes section to ensure that your meter displays the desired readings. EC/TDS Measurements 1. Remove the cap.
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Questions and answers
Temperature reading is 65.3C when not immersed in liquid, stays at that temp in liquid or out of liquid. Gives a ppm reading that is lower than actual ppm
A constant temperature reading of 65.3°C and a lower than actual ppm reading on the HM Digital COM-100 could indicate a sensor malfunction or damage. Possible causes include:
1. Sensor Damage – If the temperature sensor is damaged, it may provide incorrect readings, affecting ppm calculations.
2. Water Intrusion – If water has entered the meter due to improper sealing, it could interfere with sensor operation. Ensure the blue sensor gasket and battery compartment are tightly secured.
3. Calibration Issue – Incorrect calibration may result in inaccurate ppm readings. Recalibrate the meter to ensure accuracy.
4. Electrical Interference – Nearby electronic devices or improper handling may cause faulty readings.
If the issue persists, checking the sensor connection or contacting HM Digital for support is recommended.
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