Fieldpiece Combustion Analyzer - CAT45
Fieldpiece Combustion Analyzer - CAT45
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  • SKU: CAT45

Fieldpiece Combustion Analyzer - CAT45

GST included.

NOTE: This NEW Fieldpiece product will be available early 2023. Contact us to preorder.



Keeping Heating Systems Safe and Fuel-Efficient

The Fieldpiece Combustion Analyzer CAT45 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.


Simplicity Redefined
Featuring a high contrast, 5.5” touchscreen display, the CAT45 combustion gas analyzer 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.

Breakthrough Innovation
With a four-year sensor warranty, the CAT45 combustion gas analyzer features patent pending SensorVault ™ technology that protects and prolongs the sensor life. We also maximize uptime on the job with field-replaceable sensors.

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.



  • 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



  • 1 x CAT45 Combustion Analyzer (including probe)
  • 1 x Hard Lined Carrying case – ANC85
  • 2 x Cones – RCONE3
  • 10 x Filters – RFC10
  • 1 x USB-C Charging cable
  • 1 x Operator's Manual



Sensors 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


General Technical Data
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



1 Year from Date of Purchase (​excludes Consumables such as Filters, Gaskets, Leads, Batteries, Fuses, Sensors, Case etc)


Buy with 100% confidence knowing your purchase is backed by the full Manufacturer's Warranty. Please register your product with provided warranty card.



Australia-wide Flat Rate shipping of $15.00 per order.
This includes multiple products up to 5kg only.

Additional cost applies for orders over 5kg. Contact us for quotation.


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