Fieldpiece CAT45K2 Combustion Analyzer with Printer

  • Fieldpiece CAT45K2 Combustion Analyzer with Printer
  • Fieldpiece CAT45K2 Combustion Analyzer with Printer
  • Fieldpiece CAT45K2 Combustion Analyzer with Printer
  • Fieldpiece CAT45K2 Combustion Analyzer with Printer
MSRP: $1,442.00
Price: $1,232.50
— You save $209.50


Fieldpiece CAT45 Combustion Analyzer with Printer

Keeping Heating Systems Safe and Fuel-Efficient

The Fieldpiece CAT45 Combustion Analyzer HC provides a hassle-free solution for technicians to get the job done quickly, easily, and safely while improving system efficiency. Accurate sensors of O2, CO, pressure, and temperature along with powerful trending, provide key insight into equipment performance. SensorVault technology seals to prolong sensor life. A large, high-contrast 5.5" touchscreen display helps you easily view measurements. Save your customer data with dedicated fields for client information and create trend reports for advanced diagnosis.

Key Features and Benefits

  • Accurately measure O2, CO, CO2, draft pressure
  • 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
  • Patent pending SensorVault technology prolongs sensor life
  • Connect with Job Link System App, industry-leading 1000' wireless range
  • USB-C chargeable while in use
  • 1 Year Manufacturer Device Warranty
  • 4 Year Manufacturer Sensor Warranty

Breakthrough Innovation SensorVault

The SensorVault technology of the power button unseals sensors when powering on and and seals the sensors when powering off. SensorVault technology prolongs the life of sensors, but they eventually need to be replaced. When it does come time to replace sensors, CAT45 makes it quick and painless. Replacement sensors have calibration data built-in and do not require calibration. When a sensor's life drops below 5%, a notification appears during startup to inform you it's time to replace it. You can view estimated remaining life at any time in SETTINGS.

Simplicity Redefined

Featuring a high contrast, 5.5" touchscreen display, the CAT45 makes it easy to view measurements, whether your jobsite is a dimly lit basement or bright rooftop. You can also save your 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 & Rugged

The CAT45 can tackle any jobsite conditions with its durable construction and rubberized casing. The magnetic back lets you work hands-free and the padded hardline carrying case includes multiple inserts for accessories.

Jobsite Documentation

Seamlessly connect to Fieldpiece Job Link System App to view trends, draft pressure, and customer details, all with industry-leading 1000' wireless range. A wireless printer is also available for jobsites that require documentation printouts.


General Specs
Display Touchscreen TFT LCD (5.5 in diagonal)
Probe Size 10.7 in (272 mm) length, 0.32 in (8.0 mm) diameter
Accuracy Stated accuracies at 23°C ±5°C, <75% R.H.
Battery Type 3.7 VDC (nominal), 6400mAh, non-replaceable
Battery Life 7 hours typical (pump running 80% of the time)
Charge Time < 7 hours typical @ 5V/2A DC power (power adapter not included)
Charging Port USB-C (Usable when connected to power)
Memory 1000 jobs (approx.)
Warm Up Time 45 seconds (90 seconds near freezing)
Operating Environment 14°F to 104°F (-10°C to 40°C); < 75% RH (non-condensing)
Storage Temperature -4°F to 140°F (-20°C to 60°C); < 80% RH
Weight 39.5 oz (1120 g) with probe
Wireless Range 1000 feet (305 meters)
Fuel Types Natural Gas, Propane (LPG), Oil #2 (Light), Oil #6 (Heavy), Biofuel, Coal, Coal Town Gas, Coking Oven Gas, KOKS, Custom (x3)
Manufacturer Warranty 1 year (4 years sensors only)
Job Link System Minimum BLE 4.0 devices running iOS 7.1 or Android™ Kitkat 4.4
Latest compatibility at
Printer Fieldpiece Wireless Thermal Printer (model CATPR)
Sensor Type Response Time Max Overload
Temperature Type K rod thermocouple (fixed) < 30 seconds (T90)
Oxygen (%) Electrochemical (replaceable) < 30 seconds (T90) 30% Oxygen
Carbon Monoxide (PPM) Electrochemical (replaceable) < 90 seconds (T90) 10000 ppm Carbon Monoxide
Pressure Probe (inWC, torr, Pa) MEMS pressure sensor < 10 seconds (T90) 4.0 inWC will cause damage
Testing Parameters
Range Best Resolution Accuracy
Stack Temperature 32 to 752°F; 0 to 400°C 0.1°F; 0.1°C ±2.5°F [32°F to 212°F], ±(3.6°F or 1.5%rdg) [213°F to 752°F];
±1.4°C [0°C to 100°C], ±(2.0°C or 1.5%rdg) [101°C to 400°C]
Oxygen O2 0 to 21 vol.% 0.1 vol.% ±0.3 vol.%
Carbon Monoxide CO 0 to 4000 ppm 1 ppm ±20 ppm [0 to 400 ppm], ±5%rdg [401 to 2000 ppm], ±10%rdg [2001 to 4000 ppm]
Draft Pressure 0 to ±0.8 inWC 0.01 inWC ±0.02 inWC
CO Air Free (Calculated) 0 to 4000 ppm 1 ppm
CO2 (Calculated) 0 to CO2max vol.% 0.1 vol.%
Excess Air (Calculated) 0 to 999% 0.1%
Efficiency (Calculated) 0 to 100% 0.1%
qA (Calculated) 0 to 25% 0.1%
Dew Point (Calculated) 32 to 212°F; 0 to 100°C 0.1°F; 0.1°C
Primary Air Temp 32 to 212°F; 0 to 100°C 0.1°F; 0.1°C ±2.5°F [32°F to 212°F];
±1.4°C [0°C to 100°C]
Ambient CO 0 to 200 ppm 1 ppm ±20 ppm


  • (1) CAT45 Combustion Analyzer (including probe)
  • (1) Wireless Thermal Printer - CATPR
  • (1) Carrying case - ANC85
  • (2) Cones - RCONE3
  • (10) Filters - RFC10
  • (1) USB cable
  • (1) Manual


Software / App

Download the Fieldpiece Job Link App for your Android or iOS devices

Google Play Google Play

Link Your Tools. Link Your Jobs
Job Link. More than just measurements.

The Job Link System works with all Fieldpiece wireless tools from clamps to probes to digital manifolds, and integrates all of their functionality seamlessly. Job Link increases your level of professionalism on every job and in the back office by allowing you to not only eliminate your clipboard but also virtually adding another technician to the job because you can be in more than one place at a time. Reduce callbacks and increase efficiencies with reliable and trusted system measurements, diagnostics, and reporting!

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