Hawk - Pressure and Temperature Sensor Options

As every testing situation is unique, the Hawk 9000 is designed to be able to monitor multiple pressure, temperature, gas and liquid flows all at once. This sensor flexibility allows it to be adapted to the majority of surface test situation.

Silicon Crystal Pressure Transducer

The Hawk can be equipped with two silicon crystal pressure sensors with ranges from 750 to 15000 psi. Built with a silicon die shown to the right they are far more advanced than the typical 4-20mA pressure sensors, as typically their pressure output will vary greatly as the ambient temperature changes. These temperature induced pressure ( TIP ) waves can make analysis difficult. In contrast the Hawk silicon sensors have extreme pressure stability over widely varying ambient temperatures, without sacrificing transient response. This stability comes from the Hawk's advanced 24 bit analog circuitry, proprietary digital filtering, multi-temperature calibration and silicon crystal pressure sensors. All four technology's work together to give the operator accuracies of 0.024% FS and a resolution of 0.0003% FS over the entire calibrated temperature and pressure range. These sensors will be more than adequate for almost all your testing needs. If a long term stable sensor is needed, like for instance with capillary tube downhole pressure measurement, a quartz sensor should be used.

Quartz Crystal Pressure Transducers

If extreme stability with high resolution is required a one Quartzdyne DS Quartz Pressure Sensor can be attached to the Hawk. Quartzdyne uses a quartz crystal resonator which changes frequency in response to pressure. Since frequency can be measured with greater precision than any other parameter, the sensor's frequency output can provide high resolution pressure measurements at a accuracy of 0.020% FS. The biggest advantage is Quartz is also a perfectly elastic material, so it allows for the most stable and repeatable pressure reading of any known pressure sensing technology. With pressure ranges of 5000, 10000, 15000 and 20000 psi this sensor can be used stand alone with a Hawk or in conjunction will all the other Hawk's sensor options.

Downhole Pressure or Surface Readout

With the Hawks Gopher Surface Readout ( SRO )option, it can communicate with any of CalScan's downhole tools via electric line. This feature is used in situations where monitoring the downhole pressure real-time is needed, such as:

• Allowing a reservoir engineer to remotely monitor the well from anywhere in the world that the internet can be accessed.
• Monitoring well buildup to shorten well downtime.
• Watching pressure buildups below a packer.
• Long term permanent well monitoring to optimize well production

The versatility of the Hawk allows you to use the Gopher SRO option at the same time with any of the other Hawk sensor options. For example you could monitor downhole pressure, tubing and casing surface pressure as well as gas/liquid flow rates and temperature all on the same Hawk.

Temperature

Up to three external platinum RTD's can be added to Hawk to log temperatures. Some typical well site applications are to measure the fluid temperature of a gas or liquid flow directly out of a well, out of a three phase separator, or steam in geothermal well. Custom built for a variety of application some of our RTD features are:

• Pressure Rated: Designed to be inserted directly into the flow stream and rated to handle 10000 psi and up to 4" in length
• Flange Measurement: Thin enough to measure the temperature of a flow line by slipping in between two flanges
• High Temperature: Calibrated to over 300°C this RTD can be used to monitor high temperature steam from geothermal wells.

previous | next