Detailed conceptual design of a high temperature glass pH electrode for geothermal applications. Final report. Task II
The performance of a pH sensor for use in hot geothermal brine was determined by laboratory tests simulating the expected conditions of use. Tests were conducted at temperatures from 21/sup 0/C to 260/sup 0/C and pressures from atmospheric to 5000 psi. Probes were constructed according to the design recommended. Deficiencies were found in the areas of seal, stem glass integrity and glass stability in hot simulated brine. Modifications of the design were made and tested, the improved versions overcoming the seal and stem glass cracking problems. A different pH glass formulation was used which improved sensor performance. Test results of the final design show that the sensor survived hot brine exposure at temperatures up to and including 200/sup 0/C, retaining its low temperature pH measuring capability. Exposure to 250/sup 0/C brine resulted in irreversible probe changes which caused sensor deterioration and failure. Comparative results are shown.
- Research Organization:
- Leeds and Northrup Co., North Wales, PA (USA)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 6765235
- Report Number(s):
- PNL-3593
- Country of Publication:
- United States
- Language:
- English
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