Burn-off oven guide
Burn-off oven temperature recorders: chart, digital or automatic
Every burn-off oven with an afterburner needs a way to prove the afterburner stayed hot. Here's how the three ways of doing it compare.
What the recorder does
A thermocouple in the afterburner (secondary chamber) measures its temperature. The recorder turns that into a record you can show an inspector. In Michigan, the EGLE general permit for natural gas-fired burn-off ovens requires the afterburner to hold at least 1,400°F, the temperature to be recorded at least once every 15 minutes, and the records to be kept for five years.
Three ways to keep the record
| Circular chart recorder | Digital (paperless) recorder | OvenArchive | |
|---|---|---|---|
| Paper and pens | Yes, ongoing | No | No |
| Daily task | Change the chart | Download or check the memory | None |
| Tells you when the afterburner runs low | No — you see it later on the chart | Sometimes, at the oven | Yes, by text or email, wherever you are |
| Tells you when the record stops | No | Rarely | Yes |
| Five years of records | Boxes of charts | Files someone has to back up | Kept and backed up for you |
| Finding a specific day | Dig through boxes | Open the right file | A couple of clicks |
| Monthly reports | No | No | Yes |
Circular chart recorders
The classic. A pen draws the temperature on a paper chart that turns once a day or once a week. They're simple and familiar, but they depend on someone changing the chart, keeping ink in the pen, and catching problems by reading the chart afterwards. See our guide to burn-off oven chart paper and pens.
Digital recorders
A paperless recorder stores readings in memory. No more chart paper, but the records still live in one box on the wall. Someone has to download them, back them up and look at them, and most won't tell anyone off-site when the afterburner runs low.
Automatic records with alerts
OvenArchive keeps the record for you and watches it around the clock. If the afterburner drops below your permit minimum, or the record stops for any reason, the right people hear about it within minutes — not when someone reviews the chart. Records are kept for five years, backed up nightly, and ready to print or share with an inspector. It works alongside the oven's existing equipment, whether that's a chart recorder, a digital recorder or PLC controls, and it never controls the oven.
Don't forget calibration
Whatever records the temperature, the reading is only as good as the thermocouple. The permit requires the monitoring device to be calibrated and maintained, and maintenance and testing need to be in your records. Put a calibration date on the calendar and keep the paperwork with the oven's records.
Common questions
What kind of temperature recorder does a burn-off oven need?
Any device that continuously monitors the afterburner temperature and keeps a record that meets your permit. In Michigan's general permit, that means recording at least once every 15 minutes and keeping records for five years. Circular chart recorders, digital recorders and automatic record-keeping services can all be used if they meet your permit's conditions.
Can I replace my burn-off oven chart recorder with something paperless?
Usually, yes. Most permits require continuous monitoring and recording, not paper specifically. Read your permit's monitoring and recordkeeping conditions, keep your old charts for the full retention period, and note the change in your maintenance records.
Where is the thermocouple on a burn-off oven?
The one that matters for the permit measures the afterburner, also called the secondary chamber, which burns the smoke from the main chamber. Many ovens also measure the main chamber temperature.
Will a new recorder change how my oven runs?
A recorder only watches and records. OvenArchive never controls the oven; the oven's own controls and safety interlocks stay exactly as they are.
This guide is general information, not legal advice. Your own air permit is what governs your oven. Questions about your permit go to EGLE's Air Quality Division.