Conductivity/Resistivity Analyzer/Controller
Example 1: To determine the check resistor value needed to simulate conductivity measurement of 10 μS, use cell constant 0.1 and perform the following calculation:
10 k ohms = (0.1) x (1,000,000)
10
Example 2: To determine the check resistor value needed to simulate resistivity measurement of
10 M ohms, use cell constant 0.01 and perform the following calculation:
100 K ohms = (0.01) x (10,000,000)
Concentration values
If a wide range model is used for concentration measurement, obtain the appropriate check resistance value from the table below.
Data for Concentration Range Measurements
Material/Weight % Concentration
Hydrochloric Acid (HCl) 0 1 4
Sulfuric Acid (H2SO4) 0 1 4
Sodium Chloride (NaCl) 0 1 4
Sodium Hydroxide (NaOH) 0 1 4
Simulation Resistance (ohms) @ 25º C
Cell Constant
10 | 25 | 50 |
|
|
|
| ∞ | ∞ |
| 242.5 | 485.0 |
| 68.9 | 137.7 |
|
|
|
∞ | ∞ | ∞ |
215.5 | 538.7 | 1077.4 |
56.0 | 140.0 | 280.0 |
|
|
|
∞ | ∞ | ∞ |
574.1 | 1435.1 | 2870.3 |
195.2 | 398.0 | 796.1 |
|
|
|
∞ | ∞ | ∞ |
189.2 | 473.0 | 946.1 |
54.0 | 135.1 | 270.1 |
|
|
|
Appendix D - 2 9782 Series Conductivity/Resistivity Analyzer/Controller - Operator’s Manual | 7/99 |
