Gas detectors
Industrial Scientific Radius BZ1 Area Monitor fault codes
What all 15 Industrial Scientific Radius BZ1 Area Monitor fault codes mean, in plain words, with a risk grade for each. These come from the manufacturer's own manual. The fix for each one is in WERCS Diagnose.
Get the fixes · plans from $49/moUpdated November 4, 2026
| Code | What it means | Risk |
|---|---|---|
| OR | Positive over-range event The area monitor detects a positive over-range gas event, causing the instrument to trigger an alarm. | RED |
| -OR | Negative over-range A negative over-range event occurred on the gas detector, triggering an alarm in the area. | GREEN |
| 408 | System error The area monitor has a critical system error, meaning the instrument will not be operational until it is resolved. | YELLOW |
| ERR | Sensor error The area monitor sensor has a data fault or is incompatible, causing the sensor to fail. | YELLOW |
| OFF | Sensor off The sensor setting is turned off, which makes the sensor nonoperational and unable to monitor gas. | GREEN |
| TWA | TWA event The area monitor has reached the time-weighted average limit for gas exposure, causing the instrument to trigger an alarm. | RED |
| STEL | STEL event The area monitor has reached the short-term exposure limit for gas, causing the instrument to trigger an alarm. | RED |
| MAN DOWN | Peer man down The area monitor indicates a peer man down alarm, meaning a worker may be in distress. | RED |
| Peer Lost | Peer Lost Warning A peer instrument is no longer communicating with the group, causing the area monitor to trigger a warning. | GREEN |
| Alarms off | Alarms off The audible and visual alarms have been turned off in the settings, which prevents the monitor from alerting personnel. | GREEN |
| Group Lost | Group Lost Warning The instrument is no longer communicating with the group, causing the area monitor to trigger a warning. | GREEN |
| LEL-Low O2 | LEL-Low O2 The oxygen concentration is insufficient for the combustible gas sensor, causing it to lose functionality. | RED |
| Low battery | Low battery warning The area monitor has a low battery warning, meaning the instrument will shut down in about thirty minutes. | GREEN |
| No GPS Signal | No GPS Signal The area monitor cannot obtain its GPS coordinates, meaning location tracking will not function. | GREEN |
| Low Battery Shutdown | Critical low battery The area monitor has a critical low battery, causing the instrument to shut down completely. | YELLOW |
Every code comes from the manufacturer's own manual. Subscribers see which manual and page.