5819 Uplander Way
Apr 08, 2008 Choosing a Backup Generator Plus 3 LEGAL House Connection Options - Transfer Switch and More - Duration: 12:39. Bailey Line Road Recommended for you. HM Digital, Inc. 5819 Uplander Way Culver City, CA 90230 Implied Warranties: Any implied warranties, including implied warranties of merchantability and fitness for a particular purchase, are limited in duration to three (3) years from date of purchase. Some states do. Description HM Digital COM-100: Waterproof EC / TDS / Temp Combo Meter. (See below) Ideal for all water quality testing, water purification applications, wastewater regulation, aquaculture, hydroponics, colloidal silver, labs & scientific testing, pools & spas, ecology testing, boilers & cooling towers, water treatment and more. Digital Calibration (push button) to any point within the meter's range. Auto-off function, data-hold function and low-battery indicator. Display: large and easy-to-read LCD screen includes simultaneous temperature reading. Replaceable Sensor (model SP-C1) Factory Calibrated: The COM-100 meter is calibrated with a 1413 µS solution. COM-100 7/09 COM-100 USER’S GUIDE ADDENDUM MODE SELECTION GUIDE The COM-100 includes 6 different measurement modes allowing for a variety of uses and greater versatility and accuracy. The different modes serve to digitally calculate conductivity and TDS levels found in nature.
Culver City, CA 90230
Tel: 310-410-3100
Fax: 310-410-3106
info@tdsmeter.com
www.tdsmeter.com
TDS Meter General Usage and Calibration Instructions
Proper Usage
• Immerse the meter in the water/solution up to the maximum immersion level (2”).
• Lightly tap or stir the meter to remove any air bubbles.
– Pockets of air between the electrodes may interfere with the electrical current.
Hm Digital Ph 200 Manual
• Wait 10-20 seconds for the reading to stabilize.
– In hot (or ice cold) water, wait 20-30 seconds for the meter to compensate for temperature.
As the water temperature will adjust to room temperature, the reading will change to
accommodate the proper compensation.
• To ensure greater accuracy, turn the meter off and on for each reading.
• Shake any water off the meter after each use.
– This is to remove the droplets of water that may adhere to the surface between the
sensors and the housing around them. These drops may interfere with readings.
• Rinse in de-ionized water or other filtered water after use to ensure proper readings.
• Rinse in alcohol or acid after use in high-TDS beverages.
• The meter is not waterproof: Do not drop or submerge the unit in water.
• Do not store the unit in high temperature or direct sunlight.
Calibration
Hm Digital Com 300
• HM Digital meters are factory-calibrated at 342ppm NaCl and designed to stay consistent.
– However, you may need to recalibrate your meter from time to tim e, or for certain
applications. TDS meters are most accurate when calibrated as close as possible to
the sample to be tested. For best results, calibrate at 25
o
C (77
o
F)
• To ensure accuracy and consistency, recalibrate your meter using a commercial standard
solution. This can be done prior to usage and should be done after prolonged usage.
• For drinking water, we recommend calibrating in a range of 90ppm to 700ppm
Step 1: Measure the TDS level of the solution (follow usage instruction above).
Step 2: If the meter does not read within 2% of the solution, adjust the reading by inserting a mini
screwdriver into the trimmer pot (small hole on the rear of the meter). Gently turn the trimmer
clockwise to increase the reading and counterclockwise to decrease the reading.
– Make sure the screwdriver fits evenly into the groove of the screw.
– Note that the trimmer pot is very sensitive! Remove the screwdriver carefully.
– Try to keep the meter vertical.
Step 3: Once the meter reads within 2% of the solution, gently release pressure on the screwdriver
and remove from the trimmer pot.
– If the screwdriver is retracted abruptly, the reading may jump.
Step 4: With the meter in the solution and the reading at the correct level, press the ‘HOLD’ button.
Let the reading hold for approximately 10 seconds to fully stabilize.
Step 5: Remove the meter from the solution. Shake it to remove any water drops that may adhere
to the probes and casing, creating air gaps.
– Water droplets or air gaps may cause the meter to display an incorrect reading.
Step 6: Turn the meter off, wait a moment and turn the meter on again.
Step 7: Insert the meter into the solution and verify the reading. If the reading is accurate,
calibration is complete. If not, repeat the procedure.