DDS-12DW Benchtop Conductivity Meter
14
Specifications
Conductivity
Model
DDS-12DW
Range
0.01~20.00, 200.0, 2000µ S/cm, 20.00, 200.0mS/cm
Accuracy
± 1% F.S
Resolution
0.001, 0.01, 0.1, 1
Calibration Points
1 to 3 points
Calibration Solutions
10µ S/cm, 84µ S/cm,1413µ S/cm,12.88mS/cm,111.8mS/cm
Temperature
Range
0~105° C, 32~221° F
Accuracy
± 1° C
Resolution
0.1° C
Calibration Points
1 point
General
Temperature Compensation
0~100° C, 32~212° F, Manual or Automatic
Temperature Coefficient
0.0~10.0%/° C
Cell Constant
K=0.1, 1, 10
Normalization Temperature
25° C
Connector
6-pin
Display
LCD (135 × 75mm)
Power Requirements
DC9V, using AC adapters, 220VAC/50Hz
Dimensions
210 (L) × 205 (W) × 75 (H)mm
Weight
1.5kg
Addendum 1: Preparation of Conductivity Standard Solutions
Place AR potassium chloride reagent in a 50ml beaker and dry in an oven for 3 to 5 hours at 105° C, then cool to room temperature in desiccator.
CALIBRATION SOLUTIONS
REAGENT
84µ S/cm
Accurately weigh out 42.35mg of KCL and dissolve in 1 litre deionised water.
1413µ S/cm
Accurately weigh out 745.9mg of KCL and dissolve in 1 litre deionised water.
12.88mS/cm
Accurately weigh out 7.45g of KCL and dissolve in 1 litre deionised water.
111.8mS/cm
Accurately weigh out 74.5g of KCL and dissolve in 1 litre deionised water.
Stir the solution until the reagent has thoroughly mixed. Preparation is completed.
Addendum 2: How to calculate the temperature coefficient
To determine the temperature coefficient of sample solution use the formula below:
T
c
= × 100%
C
TB
-C
TA
C
TA
(T
B
-25)-C
TB
(T
A
-25)
