The Intercon Aero2-Mat 4115 Series of oxygen indicators accurately measures oxygen content down to 1 part per million (ppm) in a lightweight and sturdy design. Other oxygen indicators with a read-out capability of only 0.1% (1000 ppm) or even 0.01% (100 ppm) are not accurate enough to do most precision welding which is done below 70 ppm. This quality control is necessary, as discoloration due to high oxygen levels will limit corrosion resistance and lead to weld damage or even failure.

Intercon Aero2-Mat 4115 Series Oxygen indicator


  • No stabilization time required
  • Useful for finding oxygen leaks
  • Quickly establish weld parameters
  • Portable: weighs 4.8 lbs
  • With carrying case the total weight is 10 lbs


The 4115 Series uses an efficient electrode and electrolyte solution to accurately measure rest oxygen contents. This allows the unit to read values from 100% (outside air) down to 1 ppm in a time frame of less than 5 minutes. We recommend continuous oxygen monitoring while welding to prevent quality failures due to a gas or purge problem. The oxygen indicator comes complete with a probe for root gap inspections. During butt welding constant air monitoring is accomplished with the bulkhead fitting supplied with the unit.

Click here for Instructions for the use and operation of the Aero2 Mat 4115 Series Oxygen Indicators.

Model 4115B
Range 100% - 1 ppm Yes
Audible & Visual Alarm No
LCD Display Yes
Printer Capability No
Order Code 90000004
Replacement Parts
Part Part Number
Electrolyte 90000101
Diaphragm Cap 90000100
Dust Filter 90000102