Fieldpiece SOX3 Combustion Check

Fieldpiece SOX3 Combustion Check

Model: SOX3
MFG Part: SOX3
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2 Review(s)

Quick Overview

Fieldpiece SOX3 Combustion Check is a tool to easily tune furnaces when a full combustion analysis isn't needed. It can directly measures % O2 and flue temperature, and calculates % CO2, % Excess Air, and combustion efficiency.


Fieldpiece SOX3 Combustion Check

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  • Fieldpiece SOX3 Combustion Check

Characteristics: Fieldpiece SOX3 Combustion Check
  Automatic Electric Pump with Pause
  Field-replaceable Oxygen Sensor
  Hands-free testing with magnet, R-cone, and automatic pump
  Measures % O2 and flue temp
  Calculates % CO2, % EA, and combustion efficiency

Fieldpiece SOX3 Combustion Check is a hand held automated combustion check designed for the HVAC technician. The SOX3 provides all the necessary measurements for checking and tuning combustion equipment. Fieldpiece SOX3 Combustion Check measures flue temperature and %O directly to view the calculated % CO % Excess Air (% EA) and % Efficiency (%). With 3 common fuel types and a custom fuel input, the SOX3 lets you check % O, % CO, % EA and % (efficiency) on any combustion equipment.

Specifications: Fieldpiece SOX3 Combustion Check
Sensor Type Highly accurate oxygen sensor.
Operating environment 32 to 122°F (0 to 50°C) at <75% R.H.
Storage environment -4 to 140°F (-20 to 60°C) at
<80% R.H. with battery removed from meter.
Temperature Coefficient
0.1 times the applicable accuracy per °
from 32°F to 64°F and 82°F to 122°F
(0 to 18°C and 28 to 50°C)
Battery 9V.
Battery Life 28 hours typical alkaline.
Auto Power off After 15 minutes.
Accuracy Stated accuracy at 23°C±5°C, <75% R.H.
Dimensions 45.0mm(H) x 69.8mm(W) x 211.7mm(D).
Weight approx. 579.7g with battery.
Display 4 digit liquid crystal display(LCD)
with maximum reading of 9999.
Low battery indication The low battery icon is displayed
when the voltage drops below the operating level
Range -58°F to 1000°F (-50°C to 538°C)
Resolution 0.1°
Accuracy ±[0.6%+3°F(1.7°C)]after field calibration.
Sensor Type Rod K-type thermocouple.
Range -50°F to 900°F (continuous operation range)
up to 1000°F (single exposure use)
Accuracy (±4°F) on -50°F to 545°F (±0.75%)
 on 545°F to 1000°F
Oxygen Range 0 to 25%
Accuracy ±0.3%O2 (Calibrated at 72°F, 20.9%O2)
Max Overload 30% Oxygen
Operational temp range -4°F to 122°F
Response time Under 2 minutes.
Specs and Videos


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Customer Reviews

Quality on a budget Review by Kent Abbott

Now I won't try to make out like this runs the same kind of features and quality of the 1000 dollar units, but for the price it is from Fieldpiece so you know its a good instrument and it does everything you need an analyzer to do. I would recommend this unit for outfitting your techs that don't need to really detailed analysis but accurately spot-check various smaller issues on heating systems. Still a great buy!

(Posted on 9/5/2014)

simple device Review by Billy Greer

Not a full combustion analyzer but it does measure O2 and Flue Temperatures. If you are not looking for the full kit and are on a budget, this fits the bill.

(Posted on 8/19/2014)

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