The TORNADO-26 downhole surface readout gauge is designed with state of the art technology. The gauge sends pressure and temperature data from downhole to surface on a real time basis through one single conductor cable. Up to four gauges can be used for one testing job. The TORNADO26 gauge could operate at well depths up to 7,000-m (22,965 ft).
Specifications
Sensor Type Silicon-Sapphire Quartz

Service H2S Services H2S Services
Metrology–Pressure
Drift–psi/yr < ± 5 < ± 3
Accuracy–psi full scale ± 0.03% ± 0.02%, ±0.015% Typically
Resolution–psi 0.0003% 0.00006%
Range–psi Up to 20 kpsi Up to 20 kpsi
Metrology–Temperature
Rating–°C 125 (257 °F), 150 (302 °F), 177 (351 °F) 177 (351 °F), 200 (392 ºF)
Accuracy–°C ± 0.5 ± 0.2
Resolution–°C 0.01 0.01
Characteristics
Power Source +12VDC/100mA +12VDC/100mA
Communication USB/RS232 USB/RS232
Data Set Time/Pressure/Temperature Time/Pressure/Temperature
Maximum Outside Diameter–inches 1.44 (36.6-mm) 1.44 (36.6-mm)
Overall Length–inches 8.26 (209.80-mm) 17.64 (448.05-mm)
Housing Material Inconel 718/Stainless Steel 17-4 Inconel 718/Stainless Steel 17-4
Sampling Rate 1 sec to any longer period 3 sec/sample
Applications:
• Pressure Gradients
• Pressure Build-up Tests
• Drill Stem Testing
• Injection Pressure Monitoring
• Interference Tests