When it comes to ensuring air quality and safety in environments where solvents or chemicals are used, having a reliable VOC detector is critical. The C-21 VOC Sensor is a rugged, easy-to-use gas monitor designed to detect volatile organic compounds (VOCs)—helping you identify leaks, poor air quality, and potential health hazards before they become serious problems.
Whether you’re in a workshop, lab, industrial facility, or dry cleaning operation, the C-21 offers real-time, on-the-spot protection with minimal setup and maintenance.
Versatile and User-Friendly Monitoring
The C-21 is designed with both portability and fixed-installation flexibility in mind:
- Handheld operation with a built-in rechargeable battery
- Wall-mounted use with an included magnetic strip and audible alarm
- AC adapter included for continuous power
Because of its self-contained design, the C-21 requires no special training or installation. It’s ideal for non-technical users and professionals alike.
Detects a Wide Range of Common VOCs
The C-21 is especially sensitive to solvent vapors, making it ideal for environments using:
- Paint thinners
- Dry cleaning fluids
- Cleaning solvents
- Gasoline vapors
It does not respond to carbon dioxide or radon and has only a minimal response to carbon monoxide, keeping its readings focused on the most common VOC threats.
Reliable Detection You Can Trust
With high sensitivity and low detection thresholds, the C-21 detects VOCs well below OSHA Threshold Limit Values (TLVs). A bright, color-coded display (green/yellow/red) shows gas concentration at a glance, and the internal audible alarm warns users when dangerous levels are reached.
Example VOC Detection Limits:
| VOC Gas | Lower Limit | Alarm Threshold | TLV |
|---|---|---|---|
| Acetone | 4–5 ppm | 20–25 ppm | 750 ppm |
| Benzene | 5–10 ppm | 25–50 ppm | 10 ppm |
| Formaldehyde | 1–5 ppm | 15–25 ppm | 0.1 ppm |
| Toluene | 3–5 ppm | 15–25 ppm | 50 ppm |
| Trichloroethylene | 10–20 ppm | 50–100 ppm | 50 ppm |
Note: TLV is the recommended exposure limit for repeated worker exposure as defined by OSHA and other health agencies.
Built-In Control Capabilities
The C-21 isn’t just a detector—it’s a controller. Integrated relays can be used to activate external devices like:
- Ventilation fans
- Warning lights or sirens
- Shutdown equipment or alarms
Customizable DIP switches on the back of the device allow users to:
- Set alarm trigger thresholds
- Enable/disable the audible alarm
- Adjust relay response for specific applications
Data Logging and System Integration
Need to log VOC levels over time? The C-21 includes a 0–2 VDC analog output that connects to external data loggers like the DL-4C or DL-4V, enabling you to track, store, and review VOC trends in your environment.
What’s in the Box?
The C-21 VOC Sensor package includes everything you need to start monitoring right away:
- C-21 VOC Monitor
- AC power adapter
- Magnetic mounting strip
- User manual
- Calibration certificate
A replaceable internal battery is also included, making long-term use even more convenient.
Key Features at a Glance
- Portable or wall-mounted operation
- Bright LED display with visual hazard indicator
- Detects VOCs at low ppm levels
- Internal audio alarm and control relay
- Easy to use with virtually no maintenance
- Customizable alarms and relay settings
- Analog output for data logging
Stay Ahead of Air Quality Hazards
The C-21 VOC Sensor offers a powerful yet simple solution for continuous air monitoring in VOC-prone environments. With portable convenience, robust detection, and integrated controls, it helps you detect issues early, protect your workforce, and comply with safety standards—without the complexity of high-end gas detection systems.
You can find this product here: https://www.gas-sensing.com/c21-gas-sensor.html