SE-4 VOC Sensor

SE-4 replacement VOC sensor module for the C-21 VOC Monitor.  Pre-calibrated and ready for use upon delivery.  Just plug into your sensor and dispose of the old sensor.

VOC Information


The SE-4 module is the pre-calibrated replacement sensor used for the C-21 VOC Monitor. 

The sensor (SE-4) is a serviceable part on the C-21 and it's a good practice to replace it annually.  When the C-21 is no longer responding to gases and vapors, it's likely due to sensor failure and must be replaced.

The C-21 is broadly sensitive to most VOCs, but its response is different for each one.  To calibrate for a specific gas, a chemical laboratory is required.  To view this procedure see Tech Note C-100.

 SE-4 VOC Sensor Replacement:

Sensor replacement on C-21 is simply plug-n-play.  Remove the old SE-4 sensor and replace with the new one.

 Replacing the SE-4 sensor on the C-21 VOC Monitor is simple 



EcoSensors Calibration information

General Calibration Information

VOC Information

More Information
Manufacturer Eco Sensors
Call For Price No
Resolution Green = normal. Yellow = cauton. Red = danger.
Response Time Within a few seconds of the VOC gas reaching the sensor
Sensor type HMOS (Heated Metal Oxide Semiconductor) sensor
Sampling Method Diffusion
Alarms No
Operation Modes Battery, and AC Power
Dosimetry No
Operational Temperature Range 32 - 105 deg F
Operational RH Range 15 - 85% RH, non-condensing
Power Requirements Self-contained NiCad or NiMH. Approximately 2 hour capacity. Recharged by AC adapter overnight.
Tests No
Size 3.25 x 1.375 x 2.375 inch
Field Replaceable Battery No
Warranty 1 Year
Range Full scale = 50-100 ppm for most solvent based VOCs
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