4000AH Constellation Quartz Gauge


The Constellation Q150 & Q177 Quartz Gauges are the first downhole gauges to incorporate the latest in ground-breaking quartz transducer technology.

It was built to the specifications of service companies operating in the harshest environments around the world.


  • IconSTANDARD AA-SIZE BATTERIES: Tested for compatibility with standard AA cells, including the Tadiran SL-560 and Engineered Power LIRAA HT-2, which can be sourced directly at cost from the manufacturer or their international distributors, avoiding costly dangerous goods (DG) shipments.
  • IconHIGHEST RESOLUTION: higher resolution than the current leading quartz transducer.
  • IconSOUR SERVICE READY: Inconel 718 on all exposed components for the harshest environments. Custom trims available.
  • IconEXTRA LONG JOBS: Designed for power efficiency and with an 8,000,000-sample memory, the gauge will record for 22 days at a 1-second sample rate at 150°C, and much longer at lower temperatures and sample rates.
  • IconCALIBRATED FOR CONFIDENCE: We run oil bath calibrations as standard for superior temperature stability and uniformity. It’s time-consuming and messy, but compared with air calibration, the confidence is worth it to us and our clients.
  • IconTIME ACCURACY: Temperature corrected sampling timing. Onboard oscillator clock frequency fluctuates with temperature affecting time accuracy. Data analysis using curve-fit, like Horner Extrapolations, rely on accurate pressure (y-axis) and time (x-axis). Our time measurement is temperature corrected to ensure accurate and consistent time sampling in fluctuating temperatures.
  • IconPLUG AND PLAY: An intuitive user interface makes programming, downloading, and exporting gauge data simple.
  • IconCOMPACT: At a slim 0.75” diameter and 18.39” long, the gauge can be run in virtually any installation.


  • IconDownhole Reservoir Testing
  • IconDrill Stem Testing (DST)
  • IconGradient Surveys
  • IconStimulation Monitoring
  • IconInjection Testing (mini-frac)
  • IconCompletion / Casing Leak Detection
  • IconBarrier Monitoring
  • IconReservoir Communication Testing / Interference Observation Monitoring

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