Multiple-channel conductometer for measuring salinity concentrations in laboratory flows
Abstract
A multiple-channel conductometer for measuring salinity concentrations in laboratory flows is described. Channel-to-channel influence and sensitivity to extraneous grounds have been reduced to acceptable levels by a unique probe excitation and detection system which keeps the fluid at ground potential. Conductivity rather than resistivity is measured to eliminate nonlinear concentration-voltage relationships, and special circuits are included to make calibration curves independent of the cable length between probe and instrument. The electronic system utilizes operational-amplifier technology jointly with discrete components to optimize signal processing and to take advantage of recent advances in the electronic industry.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- November 1970
- Bibcode:
- 1970STIN...7527352G
- Keywords:
-
- Measuring Instruments;
- Salinity;
- Electrical Resistivity;
- Electrodes;
- Integrated Circuits;
- Signal Processing;
- Instrumentation and Photography