General DCM7021 User manual

DCM7021
USER’S MANUAL
INTRODUCTION:
Thank you for electing model DCM7021 microproce or-ba ed waterproof Digital Conductivity
Meter. It i u ed to mea ure a wide range of Conductivity, TDS, Salinity and Temperature with a
replaceable electrode. Plea e read and follow the manual carefully.
Digital
Conductivity
Meter
DCM7021 Manual FINAL-8-15:Layout 1 8/15/08 12:00 PM Page 1
99 Washington Street
Melrose, MA 02176
Phone [phone]
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com

FEATURES:
• Large LCD displays Temperature along with Conductivity or TDS or Salinity simultaneously
• Waterproof to P-57 standard
• Automatic Temperature Compensation (ATC)
• Degree °F/°C switchable
• con , , and unit S, mS, ppm, ppt, °F, °C for easy recognition while
selecting function modes
• Displays M N/MAX value and Data hold
• Low battery indicator
• Automatically shuts off after 10 minutes of non-usage
• Easy to replace Conductivity electrode module
• Floats on water
SPECIFICATIONS:
Conductivity TDS Salinity Temp.
Range 0 to 2000 µS 0 to 1300 ppm 0 to 1000 ppm 32° to 194°F
2.00 to 20.00 mS 1.30 to 13.00 ppt 1.00 to 12.00 ppt (0 to 90°C)
Accuracy ± 2% FS (Cond., TDS, Salt) ±0.4°F + 1 digit
(±0.2°C + 1 digit)
Resolution 1µS/0.01 mS 1 ppm/0.01 ppm 1 ppm/0.01 ppt 0.2°F (0.1°C)
ATC 32° to 122°F (0 to 50°C)
Calibration 0 µS, 1413 µS, 12.88 mS
Power Source 4 “AAA” batteries
Dimensions Meter: 7.7" x 1.6" x 1.4" (195 x 40 x 36mm)
Kit: 9.1" x 8.1" x 2" (230 x 205 x 50mm)
Weight Meter: 4.8 oz (135 g) (with battery)
Kit: 22.6 oz (640 g)
TDS Salt
COND
DCM7021 Manual FINAL-8-15:Layout 1 8/15/08 12:00 PM Page 2

DEVICE DESCRIPTION:
Hold/MIN & MAX Button
Lanyard Connection
Battery Compartment Cap
Main Display
Electrode Collar
Electrode Module
Sensor Tip
Sensor Protective Cap
Protective Cap
Function Mode
Button
Power/Cali ration
Button
DCM7021 Manual FINAL-8-15:Layout 1 8/15/08 12:00 PM Page 3

FUNCTIONS OF KEYBOARD:
POWER/CALIBRATION
1. Press button to switch power On or Off
2. Press and hold button to enter calibration mode
FUNCTION MODE
1. Press button to select the desired measurement mode Conductivity, TDS, or
Salinity
2. Press and hold button to change degree °F or °C
HOLD/MIN&MAX
1. Press button to enter Hold mode
2. Press and hold button to enter Minimum/Maximum mode
Press button lightly to get Minimum/Maximum value
3. Press and hold button again to exit this mode and return to Measurement mode
DIS LAY DESCRI TION:
DCM7021 Manual FINAL-8-15:Layout 1 8/15/08 12:00 PM Page 4

OPERATING PROCEDURE:
ACCESSOR ES
Upon receiving the shipment, inspect the container and equipment for any signs of damage.
Verify that you have received all the items listed: Meter, Standard Solution 1413 µS/cm,
Battery (installed), Lanyard, nstruction Manual and Carrying Case.
PREPARAT ON
1. Remove the protective cap from the meter. Rinse the electrode with clean water and wipe it
dry.
2. Press button to turn the meter power on.
Note: Don’t touch o wipe the su face of inne black senso of the conductivity cell.
CAL BRAT ON
Dip the conductivity cell into the standard solution 1413 µS/cm. Stir gently and wait until the
display is stabilized. Press and hold button to enter calibration mode until the icon CAL
appears in the display, and flashes 1413 µS/cm. When the display stops flashing and indicates
“SA”, and then “End” while calibration is ending, it will return to measurement mode.
Note: (1) Calibration with a 12.88 mS/cm standard solution would be better for measuring high
conductivity solution.
(2) The icon will appear automatically during calibration mode.
(3) “SA” will not appear if the calibration fails.
(4) f the reading is not 0 µS/cm while the meter is in the air and not dipped into any
solution, then calibrate it in the air to make the reading become 0 µS/cm.
MEASUREMENT
1. After calibration, rinse the conductivity cell with clean water and wipe it dry. Dip the
conductivity cell into sample solution to be measured. Stir gently and wait until a stable
reading can be obtained.
2. Press button to select the desired measurement mode Conductivity, TDS or Salinity.
Note: (1) “_ _ _ _” will appear in the display when it is over the measuring range.
(2) The unit will auto-range to µS/cm or mS/cm, ppm or ppt.
FUNCT ONS MODE
1. Press button to enter Hold function mode.
The icon HOLD will appear, and the reading value in the display can be locked.
Press button again to return to Measurement mode.
2. Press and hold button to enter the measuring Maximum and Minimum function mode.
Hold button until a flashing icon MAX and MIN appears in the display. The value of maximum
and minimum will appear in the display while pressing the button lightly. To exit this mode,
press and hold button until icon MAX and MIN disappears, and returns to Measurement
mode.
COND
DCM7021 Manual FINAL-8-15:Layout 1 8/15/08 12:00 PM Page 5

3. Press button to select the desired measurement mode Conductivity, TDS or Salinity.
4. Press and hold button to change °F or °C.
Note: (1) The display can not auto shut off under the status of MAX/M N mode.
(2) Change new batteries when the battery indicator flashes.
MAINTENANCE:
BATTERY REPLACEMENT
1. Loosen the screw with a screwdriver on the battery compartment cap.
2. Replace with fresh 4 “AAA” batteries and note polarity.
3. Replace the battery compartment cap and tighten the screw.
Note: (1) Be sure batteries are in the correct position by polarity.
(2) Don’t loosen the O-ring which has been mounted on cap.
ELECTRODE REPLACEMENT
1. Unscrew the electrode collar counterclockwise and remove it completely.
2. Pull the electrode module out from the tester.
3. Plug a new electrode module into the tester socket carefully.
4. Place and tighten the electrode collar to make a good seal.
APPL CAT ONS
Agriculture • Anti-freeze recycling • Aquarium boiler • Chemical industry • Cooling tower
• Drinking water • Fish farming • Food industry • Garden husbandry • Hydroponic Laboratory
usage • Plating industry • Swimming pool & Spa • Water treatment
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Calibration
Certificate
This certificate guarantees that this
product has been inspected and
tested in accordance with the
published specifications.
The instrument has been calibrated
by using equipment which is already
calibrated to standards traceable to
International standards.
Model: DCM7021
Serial no.: ________________________
Date: ____________________________
DCM7021 Manual FINAL-8-15:Layout 1 8/15/08 12:00 PM Page 7

GENERAL TOOLS & INSTRUMENTS™
80 White Street, New York,NY10013-3567
HONE [phone]
FAX [phone]
TOLL FREE [phone]
e-mail: [email protected]
www.generaltools.com
DCM7021 User’s Manual
Specifications su ject to change without notice
©2008 GENERAL TOOLS & INSTRUMENTS™
NOT CE - WE ARE NOT RESPONS BLE FOR TYPOGRAPH CAL ERRORS.
MAN# DCM7021 8/08
DCM7021 Manual FINAL-8-15:Layout 1 8/15/08 12:00 PM Page 8
99 Washington Street
Melrose, MA 02176
Phone [phone]
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com