7
I
Appendix
T
C
= [C
TB
–
C
TA
] / [C
TA
(T
B
–
25)
–
C
TB
(T
A
–
25)]
Where:
T
C
= Temperature coefficient
C
TA
= Conductivity at temperature A
C
TB
= Conductivity at temperature B
T
A
= Temperature A
T
B
= Temperature B
Calculating the TDS Conversion Factor
To determine the TDS factor of sample solution use the formula below.
Factor = Actual TDS / Actual Conductivity @25° C
Where:
Actual TDS = value from the high purity water and precisely weighed
NaCl or KCL reagent
Actual Conductivity = the meter measured conductivity value
For example:
Dissolve 64 grams of the potassium chloride (KCl) reagent in 1 liter
distilled water. If measured conductivity is 100 mS/cm, then TDS factor
is 0.64.
Optional Accessories
Order Code
Description
IE-50LT
For measuring the pure water
IE-50MT
For general purpose applications
IE-50HT
For measuring the high conductivity liquids
ECCS-84
Conductivity standard solution 84 µ S/cm, 480 ml
ECCS-1413
Conductivity standard solution 1413 µ S/cm, 480 ml
ECCS-1288
Conductivity standard solution 12.88 mS/cm, 480 ml
ECCS-1118
Conductivity standard solution 111.8 mS/cm, 480 ml
Meter Specifications
Model
BI-650
Conductivity
Range
0.01 µ S/cm to 200.0 mS/cm
Resolution
0.001, 0.01, 0.1, 1
Accuracy
± 1% F.S.
Calibration Points
1 to 3 points
Calibration Solutions
84 µ S/cm, 1413 µ S/cm, 12.88 mS/cm,
111.8 mS/cm
Temperature Compensation
0 to 100° C (32 to 212° F), automatic
Temperature Coefficient
0.0 to 10.0%/° C
Reference Temperature
25° C
Cell Constant
K = 0.1, 1, 10
TDS
Range
0.00 to 10.00 ppt (max. 200 ppt)
Resolution
0.01, 0.1, 1
Accuracy
± 1% F.S.
TDS Factor
0.1 to 1.0 (default 0.5)
Temperature
Range
0 to 100° C (32 to 212° F)
Resolution
0.1° C (0.1° F)
Accuracy
± 1° C (± 1.8° F)
Calibration Point
1 point
Communication
Signal Output
4 to 20 mA
Low or High Alarm
0.02 µ S/cm to 20.0 mS/cm
Load
500 ohm
Communication Interface
RS485
Other Specifications
Operating Temperature
5 to 50° C 41 to 122° F)
Storage Temperature
0 to 60° C (32 to 140° F)
Relative Humidity
< 80% (non-condensing)
Display
LCD, 70 × 45 mm (2.9 × 1.7 in.)
Power Requirements
DC 24V
Dimensions
96 (L) × 96 (W) × 75 (H) mm,
(3.7 × 3.7 × 2.9 in.)
Weight
350 g (12.3 oz.)
