Provides high accuracy data in hostile well environments up to 200°C.

The QM200L is our flagship Quartz Memory Gauge and is ideal for use in high pressure and temperature environments reaching 200°C.

The Gauge provides exceptional data quality using Quartzdyne’s state-of-the-art digital hybrid technology. A field replaceable 200°C memory module allows rapid change-out of the gauge’s electronics providing virtually uninterrupted use of the gauge when required for multiple runs. A large 1 million dataset memory module is supplied as standard, but a 2 million dataset memory module (max 185°C rated) is available as an option. Materials such as Hastelloy and Inconel are used in the manufacture of the QM200L to help combat corrosion effects associated with use in HPHT hostile wells. At 1.25" OD and with a lockable Battery Pack, the rugged construction of the QM200L helps it to withstand higher levels of shock and vibration than other Quartz Gauges on the market, but is slim enough to be deployed in a spring-mounted Shock Housing if necessary.



  • High pressure and temperature solution for up to 23ksi and 200°C
  • Field replaceable memory modules, 1 million dataset (QM200EX-1M) as standard or 2 million dataset (QM200EX-2M, 185°C) as an option
  • Highest quality data assured in any environment
  • Redundant or sequential memory modes (saves data into two memory banks, securing data or doubling memory capability for long term jobs)
  • Multiple short term tests are possible without downloading memory
  • Fits into standard downhole Gauge Carriers and Shock Housings
  • Can be converted to SRO (Surface Read-out) mode


  • Ideal for use in hostile well, H2S and CO2 corrosive environments
  • Gradient survey
  • Interference test
  • Pressure build-up or draw-down test
  • Production optimization
  • Reservoir evaluation, well testing and DST
  • Slickline operations
  • Static, flowing and build-up surveys

Specific Applications

  • High temperature environments up to 200°C
  • Testing requirements demanding extreme accurac


Maximum external pressure Must not exceed sensor range or 23 ksi Max
Sensor range 5 options from 5 ksi to 25 ksi (23 ksi Max)
Sensor type Quartz resonator
Accuracy ± 0.015% FSO
Drift 0.02% FSO per year
(resolution figures stated in brackets are for 0.1 second sampling interval only)
5 ksi <0.006 psi
(<0.06 psi)
10 ksi <0.006 psi
(<0.06 psi)
16 ksi <0.008 psi
(<0.08 psi)
20 ksi <0.008 psi
(<0.08 psi)
25 ksi <0.010 psi
(<0.10 psi)
Maximum temperature * Must not exceed sensor range or 200°C Max
Sensor range 3 options, 150°C, 177°C and 200°C
Accuracy +/- 0.15ºC
Repeatability < 0.01 °C
Resolution <0.005°C (scales directly with sample rate)
Battery type 2 CC, Lithium
Operating voltage 3.2 to 3.9 V
Battery life ** 52 days ***
Sampling interval 0.1 second and 1 second to 1 hour
Capacity **** 1,000,000 data sets (sequential mode) or 500,000 data sets (redundant mode)
Record contents Time, pressure, temperature
Materials Inconel 718 & Hastelloy C-276
Service Standard or H2S

* Optional QM200EX-2M memory module is rated up to 185°C only
** Battery life varies with temperature and sampling interval
*** Specified at 125°C and 5 second sampling interval
**** Double this capacity for optional QM200EX-2M memory module