The C50 / OILKIT is an effective and affordable way to measure combustion efficiency when installing or maintaining oil-burning appliances. This kit combines the innovative and feature packed C50 Combustion Analyzer and the SPT1 Smoke Test Kit. Equipped with smart and useful features like the digital multimeter style rotary selector, a real time clock and a magnet built-in to the boot. The C50 captures and calculates data with professional accuracy and ease. The SPT1 Smoke Test Kit determines efficient combustion from distillate fuels. This kit also includes a professional grade flue probe with a stainless steel shaft, an AC power adapter, an extra particle filter all packed in a compact and convenient soft carrying case. Three year limited warranty (Two year limited warranty on sensor).

The C50/C75 enables HVAC professionals to accurately test and service all residential combustion appliances. The extra large backlit LCD displays two parameters at one time. Easily choose the desired combustion parameter with the rotary selector. The optional printer allows you to print your readings to document your test results.

For technicians who are required to diagnose and repair heating equipment, the C75 also has a CO sensor.

Features include

• Choose combustion parameter with a rotary selector
• Measure flue temperature and oxygen (C75: also carbon monoxide)
• Calculates carbon dioxide, gross & net efficiency, and excess air ( C 75: also carbon monoxide air free)
• Large backlit LCD, 2 line display
• Protected boot with an integral magnet
• 1 ppm accuracy
• Infrared printer port
• User programmable header
• 16 position memory

Main Display Parameters

O2 : Oxygen reading in percentage (%).
Tf :  Te m p e rature is measured by the flue gas probe in Centigrade or Fahrenheit. Will show ambient temperature after fresh air calibration and “- - - -” if the flue probe is disconnected.
CO : Carbon Monoxide reading displayed in ppm (parts per million). “- - - -” is displayed if there is a fault with the CO sensor or the instrument has not set to zero correctly, switch off instrument and try again.
COa : Carbon Monoxide air-free reading referenced to an oxygen level of 0%. Do not confuse this reading with the actual CO reading as detailed above. 
CO₂ :  Carbon Dioxide calculation determined by the type of fuel. This only shows a reading when a combination test is being carried out. “- - - -” is displayed while in fresh air.
^T : Net temperature calculated by deducting the AMBIENT (or INLET) temperature from the measured FLUE temperature. Displays in either Centigrade (°C) or Fahrenheit (°F) and will display “- - - -” if the flue probe is not connected. 
EFF (G): Combustion efficiency calculation displayed in percentage. Gross (G) or Net (N) can be set (see MENU). The calculation is determined by the fuel type and uses the calculation in British Standard BS845. The efficiency is displayed during a combustion test, “- - - -” is displayed while in fresh air.
XAIR % : Excess air calculated from the measured oxygen and type of fuel used. Displays reading during a combustion test. “- - - -” is displayed while in fresh air.
AMB : Boiler air INL ET temperature used to calculate the NET temperature
CO/CO2 : The CO/CO2 ratio is the ratio of measured CO divided by calculated CO2 .