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VOC GAS SENSOR Model C‑21 - C‑21

• Allow at least 5 minutes warm‑up.
• Read all instructions in this manual.
• Keep instrument dry. Never let water or other liquids into the sensor.
• Do not drop the instrument or subject It to continuous vibration.

Model Number: C‑21
Data Sheet:

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Product Specification

VOC GAS SENSOR Model C‑21 General：

The model C‑21 is a solid‑state gas monitor capable of sensing a variety of gases and vapors. The ones it is generally sensitive to are called VOCS (volatile organic compounds),and the most common application of the C‑21 is for solvent vapors. Common examples are paint thinners, dry cleaning fluids, cleaning solvents, and gasoline vapors. The instrument does not respond to carbon dioxide or radon, and has only a weak response to carbon monoxide. The C‑21 is self‑contained except for its AC adapter power module.The instrument also has an audio alarm and has outputs to external alarms, data loggers,calibration equipment, etc.

VOC GAS SENSOR Model C‑21 safety features ：

Enclosure: Self‑extinguishing ABS plastic. Sensor: Heated element is flame arrestor protected. Electrical: (a) Circuits operate at 24 volts, 250 mA, or less with no high capacity inductors

or capacitors. (b) Self‑resetting fuse to protect against excess input current flow. (d)

Overvoltage protection diode barrier to protect against supply voltage surges, spikes,

overvoltage, and reverse polarities.

VOC GAS SENSOR Model C‑21 precautions ：

• Allow at least 5 minutes warm‑up.

• Read all instructions in this manual.

• Keep instrument dry. Never let water or other liquids into the sensor.

• Do not drop the instrument or subject It to continuous vibration.

• Do not store in high levels of dust.

• Do riot clean the instrument with cleaning chemicals or solvents. Clean it with a

damp cloth.

• Do not operate near heavy aerosols (spray) usage or where oxygen Is being

administered.

• Call a qualified electrician If you have any doubts about voltages, currents, electrical

practice, etc.

VOC GAS SENSOR Model C‑21 parameter：

	First detects	Alarm (First red bar)	TLV*
	ppm	ppm	ppm
Acetone	45	2025	750
Benzene	510	2550	10
Diacetone alcohol	510	2550	50
Methylene chloride	810	4050	50
Methyl ethyl ketone	35	1520	200
Perchloroethylene	5	50	50
Toluene	3-5	15-25	50
Trichloroethylene	10-20	50-100	50