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Fieldpiece CAT85K2 Combustion Analyzer HydroCycle and Printer
Fieldpiece CAT85K2 Combustion Analyzer HC with Wireless Printer

Fieldpiece CAT85K2 Combustion Analyzer HydroCycle and Printer

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On Sale: $2,232.00 $1,897.20
Retail Price:$2,232.00
You Save:$334.80(15%)
The Fieldpiece CAT85K2 is a residential combustion analyzer that measures and analyzes key parameters of combustion equipment, including O2, CO, CO2, temperature, efficiency, and draft pressure. The patent pending HydroCycle™ Pump technology on the Fieldpiece CAT85 flue probe automatically separates and returns accumulated water to the flue. In addition, the CAT85K2 gas analyzer uses an innovative SensorVault technology seal to prolong the life of the sensors. The Fieldpiece CAT85K2 combustion analyzer features a large 5.5” touchscreen display, field-replaceable sensors, live draft pressure measurement to maintain accuracy throughout the combustion test, and the ability to connect to Fieldpiece Job Link App for job site documentation.
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Fieldpiece CAT85K2 Combustion Analyzer HydroCycle


The Fieldpiece CAT85K2 is a residential combustion analyzer that measures and analyzes key parameters of combustion equipment, including O2, CO, CO2, temperature, efficiency, and draft pressure. The patent pending HydroCycle™ Pump technology on the Fieldpiece CAT85 flue probe automatically separates and returns accumulated water to the flue. In addition, the CAT85K2 gas analyzer uses an innovative SensorVault technology seal to prolong the life of the sensors. The Fieldpiece CAT85K2 combustion analyzer features a large 5.5” touchscreen display, field-replaceable sensors, live draft pressure measurement to maintain accuracy throughout the combustion test, and the ability to connect to Fieldpiece Job Link App for job site documentation. For convenience, the Fieldpiece combustion analyzer includes dual manometer ports. The Fieldpiece CAT85K2 comes with a wireless thermal printer (CATPR).

The Fieldpiece CAT85K2 include a wireless printer for a model without a printer, the Fieldpiece CAT85.

Main Benefits


  • Accurately measure O2, CO, CO2, draft pressure
  • Includes wireless thermal printer
  • Built-in manometer means one less tool to carry
  • Automatically separates and returns accumulated water to the flue using the patent pending HydroCycle Pump technology.
  • Lower cost of ownership with four-year sensor warranty
  • Large 5.5" touchscreen display with one-touch power on
  • Field-replaceable sensors to maximize uptime
  • Troubleshoot while running analysis with live draft pressure
  • Patent pending SensorVault technology prolongs sensor life
  • Connect with Job Link System App, industry-leading 1000' wireless range
  • USB-C chargeable while in use


Breakthrough Innovations

If you’re tired of emptying water traps, the CAT85’s flue probe Hydrocycle™ Pump automatically separates and returns accumulated water to the flu. Also, the CAT85 offers a built-in manometer so you can carry one less tool.

Simplicity Redefined

A new, high contrast 5.5” touchscreen display makes it easy to view measurements, whether your jobsite is a dimly lit basement or bright rooftop. You can also save customer data with dedicated fields for client information. If you require advanced diagnoses, a live trend report is available with O2, CO and CO2 readings.

Reliable Performance

Along with a four-year sensor warranty, the CAT85 HVAC combustion analyzer also features patent-pending SensorVault™ technology that extends sensor life by sealing the sensors from oxygen in the air during storage. If they need to be swapped out, they are field-replaceable to maximize uptime.

Rugged Construction

Durable construction and rubberized casing make the CAT85 tough enough to tackle any jobsite conditions. The magnetic back also lets you work hands-free and the padded hardline carrying case has multiple inserts for accessories.

Jobsite Documentation

Connect to Job Link® System App to view trends, draft pressure and customer details, all with 1000’ wireless range. A wireless printer is also available for jobsites that require documentation printouts.

What’s Included


  • (1) CAT85 Combustion Analyzer HC (including probe)
  • (1) Wireless Thermal Printer - CATPR
  • (1) Carrying case – ANC85
  • (2) Cones – RCONE3
  • (10) Filters – RFC10
  • (1) USB-C Charging Cable
  • (1) Manual
  • 1 year warranty
  • 4 Year Sensor Warranty

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Fieldpiece CAT85 Combustion Analyzer with HydroCycle Pump
Fieldpiece CAT85K2 Combustion Analyzer HydroCycle Pump and Printer

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