≤ ± 0.2% BFSL accuracy
Downhole Pressure Sensor
CS90 Series
CS90 Features
Downhole Applications
**Disclaimer: Unless otherwise agreed in writing, Core Sensors products are not authorized for use in applications including medical devices, life support systems, in-flight aerospace, nuclear or any other application where the product failure could result in personal injury or death.
About the CS90
The CS90 Downhole Pressure Sensor uses a fully active four arm Wheatstone bridge and a dielectrically isolated bulk silicon sensing element based on proprietary MEMS technology. This downhole sensor was designed to withstand the high pressure, high temperature environments that are common in downhole oil & gas exploration. The compact design allows for installation in downhole tools without sacrificing space. Standard offering includes a 3/8”-24 UNF-2A with 74° cone process connection, compensated millivolt output signal, 12.7mm diameter housing, and solder hooks. CS90 downhole pressure sensors are designed using Alloy 718 material. An additional PT1000 RTD temperature output is standard for further measurement capabilities. With a variety of standard options, Core Sensors manages to be a leader in both technology and product availability.
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Miniature Package – High Millivolt Output
Get More Output: The CS90 Downhole Pressure Sensor offers a typical compensated output of 10mV/V with a maximum excitation of 10VDC. This provides a large amount of usable output, simplifying signal conditioning. For legacy installations, 2.6mV/V is available. Additional output sensitivities are available upon request. Further, Core Sensors offers customers various forms of calibration data, including polynomial data, on request. The serial number-specific data can be accessed and downloaded online to simplify your installation and access. The CS90 downhole sensor also offers a repeatable, compensated zero and span output signal compared to uncompensated titanium downhole sensors.
All of these features come in a small, compact package with a typical diameter of 12.7mm. The CS90 comes standard without a hex on the front end of the sensor (near the process connection threads) to ensure fitment in drilling tools with confined spaces. A hex comes standard on the back end of the sensor (near the solder hooks) which can be used during installation.
Specifications
Performance
Accuracy @ 25°C*
≤ ± 0.2% BFSL
Stability (1 Year)
≤ ± 0.25% of FS
Overpressure
1.5X rated pressure
Burst Pressure
3X rated pressure
Platinum Resistance Temperature Detector (RTD)
Class A, PT1000
* Accuracy includes non-linearity, hysteresis and non-repeatability
Thermal
Operating Temperature
-40°C to +204°C
Compensated Temperature
+25°C to +150°C
TC Zero
±0.025% FS per °C, typical
TC Span
±0.025% FS per °C, typical
Mechanical
Process Connection
3/8″-24 UNF-2A w/ 74° cone
Wetted Material
Inconel 718 (UNS N07718)
Installation Torque
14-17 Nm
Installation Information
Mount using supplied Inconel 600 replaceable metal seal
Environmental
Vibration
IEC 60068-2-6
Shock
IEC 60068-2-27
Electrical (Millivolt)
Output
Millivolt compensated (mV/V)
Excitation*
10VDC, max
Zero Offset
≤ ± 3% FSO
Span Tolerance
≤ ± 3% FSO
Full Scale Sensitivity
See “Model Number Configuration” for options
Isolation Voltage
250VDC
Input Impedance
2.5KΩ, typical
Response Time
0.1ms, typical
0.2ms, max
* Sensor will operate off of any voltage up to 10VDC. Output is ratiometric to supply voltage used.
Specifications are subject to change without notice
Configure Your CS90 Downhole Pressure Sensor
Looking for our classic model number guide? Click “Expand classic model number configuration guide“.
Not all configurations are available. Our sales team can recommend the closest available configuration based on your requirements.
Contact Core Sensors for configurations not shown.
– Ordering Example: CS90-ADEA000-20000PS-C00 (3/8″-24 UNF-2A Male w/ 74° cone, Inconel 718, 10mV/V with PT1000, Solder hooks, 20000 PSI sealed gauge, No data)
Note: Mobile users can use the zoom feature to view the model number configuration matrix clearly.
Dimensions
Note that dimensions are for reference only. Please contact us if you do not see a dimension listed.
Note: Mobile users can use the zoom feature to view the dimensions clearly.
Pin A B C D E F
Function +Excitation +Signal -Signal -Excitation PT1000 PT1000
Downloads
Datasheets
Wiring Guides
Certificates
Forms
General
Frequently Asked Questions
What is polynomial data?
Polynomial data refers to a set of coefficients that define a mathematical function used to model the relationship between the sensor’s output and the actual pressure it is measuring. This function is typically a polynomial equation, which is a sum of terms, each consisting of a coefficient multiplied by the sensor’s output raised to a certain power. Core Sensors offers the option to order a CS90 HP HT sensor with polynomial data. Our standard offering includes Polynomial Data from +25°C to +150°C with six (6) temperature points and five (5) pressure readings at each temperature. This data can be downloaded online by serial number.
Does Core Sensors offer titanium material for its downhole sensors?
No. Since developing the CS90 series downhole pressure sensor with Bulk Silicon Technology, Core has focused on two materials: Inconel 718 and Hastelloy C276. These materials offer excellent liquid and gas compatibility and are better sensor materials in terms of our manufacturing process, sensor accuracy/repeatability, and industry adoption.
Why does Core offer a 10mV/V output signal? Does it offer 5mV/V or 2.6mV/V?
Using bulk silicon technology, the sensing element of the CS90 series is manufactured using high output silicon strain gages. In the form of a Wheatstone bridge, the gages measure the slightest deflection of the metal diaphragm to produce a high quality, repeatable output signal. Core Sensors trims the raw output signal to 10mV/V after pressure and temperature compensation and 100% tests and inspects each sensor before shipment.
Competing technologies are not able to produce 10mV/V of signal, so the default is to offer less, such as 2.6mV/V. Core Sensors can calibrate its downhole pressure sensors to be backwards compatible with the 2.6mV/V signal or other lower level millivolt outputs.
Can CS90 downhole pressure sensors handle high shock and vibration?
Yes, CS90 pressure sensors are designed for downhole environments. While our shock and vibration spec is to industry standards, customers have lab and field tested our sensors under extreme conditions to qualify various package designs. From the sensing element to the electrical connection, Core has created a robust package. Contact us to discuss your shock and vibe requirements.
Can you explain the thread sealing method of the CS90?
CS90 pressure sensors come standard with a ⅜-24 UNF male process connection With Inconel 718 material. A sealing insert is provided with the sensor manufactured from Inconel 600, a slightly softer material with equivalent corrosion resistance. As the sensor thread is torqued in place, the front insert creates a metal-to-metal seal between the sensor and mating surface. This design minimizes the torque strain on the sensor which can create offsets in the zero reading. It also creates a robust seal for high pressure applications.
For a details description and images, visit our application article on the crush seal design: Downhole Sensor Crush Seal
Additional inserts are available upon request. Contact our office.
Are vented downhole pressure sensors available?
Yes, the CS90 series can be designed with vent holes in the housing to allow the flow of non-conductive fluid into the housing. This is used when the downhole sensor is used to measure differential pressure between the non-conductive fluid and the process connection.
Core will work with you to determine the hole diameter, placement, and count to meet your needs.
Connect With Our Sales Team
Have questions? Need a quote? We are ready to help! Fill out the form and a member of our sales team will contact you to discuss your requirements. You can also give us a call at (862) 245-2673.
