Avoid Costly


CALIPERAY™ is a permanently-mounted ultrasonic (UT) remote thickness tracking system used to monitor piping and vessel wall thickness in high-temperature and difficult-to-access locations.



High-temperature, hard-to-reach locations are not tested as often as they should be. Without adequate testing, plant operators have little-to-no warning of developing problems arising from corrosion and erosion – a costly surprise.

Traditional ultrasonic thickness testing (UTT) methods for determining corrosion and erosion on piping and vessel walls can be challenging to execute at times. It can often be difficult for technicians to access assets in potentially hazardous locations, and manual measurements have to contend with changes in surface conditions, technology and equipment.

The CALIPERAY™ remote thickness tracking system makes it easy for operators to stay on top of their asset integrity and maintenance by utilizing permanently installed ultrasonic sensors to remotely, quickly and accurately monitor corrosion and erosion.


  • ReDucers
  • TEES

Wireless Mesh

The thickness transducers make up a wireless mesh network. As they collect data from the piping or vessel walls, they both receive and transmit information through the rest of the network until it reaches the Smart Wireless Gateway, where it is then transferred to the host computer. The wireless mesh allows CALIPERAY™ to seamlessly merge with on-site and remote network equipment.

The mesh network is self-healing and self-organizing, so if there is ever an interruption in the network, such as a temporary or even permanent obstacle, the transducers will simply find another path to the gateway. This smart sensor network makes it easier to install the network, streamlines the collection of data, and ensures higher reliability and lower maintenance.

Features & Benefits

Non-Intrusive Design and Installation

Highly Precise Readings

High-Temperature Functionality

Self-Organizing And Self-Healing Network

Decreased Reading Intervals

Improved Corrosion Management & Detection Equipment

Reduced Installation Costs


CALIPERAY™ provides more valuable insight into the condition of pipes over traditional methods. Once installed, CALIPERAY™ monitors pipe wall thickness automatically, collecting data with a greater frequency and a higher accuracy than manual readings, because the permanent sensors remove many of the variables that create inconsistencies in manual readings. This data is transmitted wirelessly to a database, where it is stored for analysis through the CALIPERAY™ Web App, PCMS®, or other top-tier Integrated Database Management Software (IDMS).


By tracking changes to a pipe’s wall condition, CALIPERAY™ provides a rich dataset, which helps operators make the right judgements on when to proactively take remedial action, and when to hold off. The transducers are capable of withstanding temperatures of up to 350° C (662° F). This level of insight delivers benefits in cost, safety, planning, and peace-of-mind.


Rather than being welded onto a pipe, fittings, or a vessel wall, the non-intrusive CALIPERAY™ system is attached with a clamp, which lowers the overall cost of installation. High corrosion areas tend to occur in locations that are not regularly tested, which opens the possibility of extensive loss of material, resulting in costly repairs. Frequently-taken measurements enable the opportunity for more reasonable maintenance, extending your maintenance budget and the operational lifeline of the asset by allowing any potential problems to be caught as soon as they manifest.

CALIPERAY can Decrease Costs

In addition to testing more frequently, CALIPERAY’s™ readings are more accurate than traditional methods. As refiners depend on these measurements for important resource allocation, it is essential that they have access to as much trustworthy information as possible. The permanent sensors offer consistently precise data so engineers know exactly the extent of a problem as soon as the information is returned to them, which leads to cost-effective, well-informed decision-making.


The cost of a system isn’t defined solely by a price tag. Critical pipe assets can be located in hazardous areas in high temperature locations, and sending technicians into such areas comes with a risk of injury to personnel. CALIPERAY™ limits the need to send employees into dangerous areas, as once it’s installed, the tracking system takes care of conducting readings for the technicians.

CALIPERAY can Enhance Safety

Constantly testing pipes and vessels also makes them intrinsically safer. As many of these assets are in parts of a plant that contain hazardous materials, if an incident were to occur between manual tests, it may put employees in jeopardy. CALIPERAY™ not only greatly reduces the need for employees to be in the operating area, it also makes it safer for them when they do have to be in the vicinity.


The tracking system is compatible with several types of data-analyzing software. The CALIPERAY™ web application will track and store data as it comes into the host computer, and the wireless network can be integrated into whatever top-tier inspection database management software (IDMS) an organization may already have in-house. In addition, MISTRAS offers its own Plant Condition Monitoring Software (PCMS®).

Once the information is on the host computer, these software systems provide immediate automated data analysis. They offer information on corrosion rates, track data over time to reveal trends, determine risk, and instruct engineers when further inspection is required. Software systems such as these enable technicians to make timely, well-informed decisions when immediate action needs to be taken.



‘Single Source’ Mechanical Integrity Software Solution



Integrate CALIPERAY with your current IDMS



Simple On-Line Monitoring of pipe wall thickness


When the integrity of your critical assets is at stake, trust the latest innovation from the industry-experts. MISTRAS Group (NYSE: MG) is a publicly-listed, leading global nondestructive testing (NDT) and asset protection solutions provider with decades of industry-proven expertise and thousands of talented engineers, scientists and technicians on staff.


MISTRAS’ immense knowledge and expertise has influenced the industry at large, and extends beyond the hardware-only backbones of competing manufacturers. The CALIPERAY’s sophisticated design and capability embodies MISTRAS’ technological leadership.

Typical Installation

  • Surface Preparation

    Ground clean to prepare the surface where the CALIPERAY™ will be installed for use.

  • Installation

    Unit sensors are mounted on the prepared surface. CALIPERAY™ does not require sensors to be welded on.

  • Thermocouple Hook-UP

    Spring terminals inside the unit allow for easy thermocouple hook-up.

  • Completed Install

    System mounted and installed on vertical piping (top) and horizontal piping (bottom).


  • Manufacturer: MISTRAS Group, Inc.
  • Product Line: CALIPERAY™ Thickness Trackers
  • Reference Name: 1616 Wireless UT Node
  • Model Number: 1616-5015 (IS Certified)
  • Multiplexer: 4-Channel for single or dual crystal transducers
  • Receiver: 20-70dB Gain
  • Bandwidth: 1MHz to 9MHz
  • Battery Life: Up to 5-Years at 1 measurement per day
  • Temperature Range: -28°C to +55°C
  • Made in USA
Single Crystal Sensor (ISSUT5M-HT)
  • Operational Frequency Range: 3 - 5 MHz
  • Shock Limit: 10,000 g
  • Surface Temperature: -55°C to 350°C
  • Sensor Material: Stainless Steel 316
  • Connector Type: LEMO 00
  • Connector Location: Side
  • Sensor Type: Contact, Delay
  • Seal Type: Laser Welded
  • Sensor Height: 1.5 inches
  • Sensor Diameter: 0.75 inches
  • Delay Line: 1 inch
  • Cable Type: 1’ hard line + 2M (6.6’) soft line
Dual Crystal Sensor (ISDUT5M)
  • Operational Frequency Range: 5 MHz
  • Surface Temperature: -55°C - 150°C
  • Shock Limit: 10,000 g
  • Sensor Material: Stainless Steel 304/316
  • Connector Type: LEMO 00
  • Connector Location: Side
  • Sensor Type: Contact
  • Seal Type: IP66
  • Sensor Height: 0.934 inches
  • Sensor Diameter: 0.65 inches
  • Cable Length: 2M (6.6’)


  • FM Approved
  • CE 0518
  • Ex II 1 G

The CALIPERAY™ system holds many top tier certifications: IS/Class I, Division 1, Groups A/B/C/D; AEx ia for Class I, Zone 0, Group IIC (US); Ex ia for Class I, Zone 0, Group IIC (CA); T4 for -55°C ≤ Ta ≤ +55°C; IP66; Ex ia IIC T4 for -55°C ≤ Ta ≤ +55°C; IP66; FM15ATEX0043X APPROVED.

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