At JM Test Systems we calibrate a wide range of pressure equipment to ensure precise measurements from your instruments. It is imperative that the calibration of your pressure equipment is performed by a certified and accredited service provider like JM Test Systems. We offer in-lab and on-site calibration services to meet your various needs. Our laboratories are ISO 17025 accredited and offer all-encompassing pressure calibration services for your equipment at our multiple locations in Louisiana, Texas, and Illinois. We also offer pick-up and delivery services in most areas. Discover our wide range of pressure calibration services, tools, and equipment by contacting us today.


Our Pressure Calibration Services Include:


Gauges – Process, Test & Precision (Absolute to 50,000 psi with accreditation up to 36,000 psi)

A pressure gauge is one of the most commonly used of all pressure-related devices and can be defined as an instrument that is used to measure the pressure of a liquid or gaseous material by collecting the force it would exert at a state of rest. Periodic calibration of your pressure gauge or device guarantees that your equipment meets manufacturer’s specifications (unless otherwise specified), along with meeting the industry’s most often required safety and compliance standards while on the jobsite. Pressure gauge calibration is critical for worker safety and is extremely important for product quality control. Errors that arise from using uncalibrated or damaged equipment may result in costly consequences or can even lead to someone getting injured while on the job. Calibration verifies and/or restores the accuracy of your equipment back to proper working conditions. Periodic calibration of your pressure device ensures that the integrity of the device is retained and also guarantees that its measurements are precise and accurate. Pressure gauge calibration can be performed on absolute, gauge and differential pressure sensors. The following list below includes more commonly used types of pressure-related devices other than gauges that can also be serviced here at JM Test Systems:

  • Pneumatic Calibrators
    • A pressure calibrator is an accurate pressure device capable of comparing a pressure output to another pressure device of lesser accuracy. These more-accurate devices might also be labeled “pressure standards” in the calibration industry. Often when pressure/pneumatic calibrators are comparing a pressure output to a DUT (device under test), the test ratio is 4:1. In other words, the pressure calibrator is typically four times more accurate than the device that is being calibrated. In some cases, pressure calibrators may be designed to include other modes of operation such as a measure or standby mode that allow the DUT to input pressure into the calibrator’s test port. Some pneumatic controllers also integrate internal pumps into their design, allowing the generation of pressure needed to test many DUT’s. Other pneumatic controllers typically include a precision regulator that is capable of metering an external supply pressure in order to maintain a consistent and precise pressure output.
  • Hand Pumps – (Hydraulic, pneumatic and vacuum)
    • A hydraulic hand pump converts mechanical energy into hydraulic energy, which is a combination of pressure and flow. Pneumatic hand pumps use the force of compressed gasses to generate mechanical effects, like the use of compressed air to create force that moves fluids through a piping system. Vacuum hand pumps are used to easily create a vacuum and pressure with the touch of a finger.
  • Pressure Switch
    • A pressure switch is an instrument that will measure pressure in any given environment and will indicate when a system has reached a certain pressure or lost depending on the limits set by the user.
  • Pressure Transmitters / Transducers
    • Pressure transmitters are instruments that measure the pressure in a liquid, fluid or gas. Pressure transmitters are typically used to measure pressure inside of industrial machinery. Pressure transducers are instruments that convert pressure into an analog electrical signal. JM Test Systems has the ability to calibrate pressure transmitters and pressure transducers to return your equipment back to proper working conditions.
  • Pneumatic Controllers
    • A pneumatic controller is an instrument that is designed to measure temperature or pressure and transmit a corrective air signal to the final control element. Pneumatic controllers need to be calibrated regularly in order to ensure the instruments are performing accurately and reliably. JM Test Systems has the capabilities to calibrate many types of pneumatic controllers, ensuring that the instrument is providing correct measurements and functioning properly.
  • Vacuum Pumps / Vacuum Variators
    • JM Test Systems calibrates vacuum pumps and vacuum variators. Vacuum pumps are instruments that remove gas molecules from a sealed volume in order to leave behind a partial vacuum. Vacuum pumps and vacuum variators can be damaged over time and basic maintenance and recalibration of your instrument, by a high-quality service provider like JM Test Systems, can ensure that your equipment is providing accurate measurements. At JM Test Systems, our calibration services guarantee that your instrument will give precise measurements the first time.
  • Manometers –
    • A manometer is an instrument used for measuring the pressure acting on a column of fluid, especially one with a U-shaped of liquid in which a difference in the pressures acting in the two arms of the tube causes the liquid to reach different heights in the two arms. Using a manometer that is not calibrated can lead to costly mistakes and consequences. JM Test Systems calibrates manometers to verify and /or restore your instrument back to proper working conditions.

Deadweight Tester Calibration – (Pneumatic or Hydraulic)

A deadweight tester (DWT) is an instrument that uses known traceable weights to apply pressure to a fluid for checking the accuracy of readings from a pressure device. Deadweight tester generates pressure by applying the pressure formula:

P = F/A (or pressure is equal to the application of force over unit of area.)

A Deadweight Tester includes a piston with a cross sectional area. The piston and mass (weights) will begin to “float” in equilibrium only after the internal fluid in the system is pressurized. The internal fluid can be either hydraulic or pneumatic depending on the type of DWT. The pressurization of many hydraulic deadweight tester systems is performed using a handpump with an attached reservoir filled with the appropriate fluid.

JM Test Systems calibrates pneumatic and hydraulic deadweight testers to ensure that they are performing accurately and reliably. Inaccurate measurements can result in costly consequences for you or your company, so it is imperative to get your deadweight testers calibrated with an accredited service provider like JM Test Systems.