Figaro TGS2620 TGS2630 methane sensor gas sensor 

Figaro TGS2620 TGS2630 methane sensor gas sensor

TGS2620 parameters

Packaging: TO-5 metal can, φ9.2×7.8 mm, approximately 1.2g
Test targets: ethanol, various organic solvents (acetone, toluene, xylene, etc.), and also has cross-sensitivity to CO and some combustible gases
Typical range: Ethanol 50~5000 ppm

Power supply:
Heating wire VH: 5.0V ±0.2V (AC/DC available)
Circuit voltage VC: 5.0V ±0.2V DC
Heating current: 42±4 mA; Heating power consumption **≈210 mW**
Load resistor RL: ≥0.45 kΩ (optional as needed)
Sensor resistance under 300ppm ethanol: 1~5 kΩ
Operating / Storage Temperature: -40 ~ 70°C
RoHS2 compliant, long lifespan, simple circuitry, low cost, Figaro technology…

Principle

Semiconductor gas-sensitive materials: when gas concentration rises→ sensor resistance decreases; When paired with voltage-dividing load resistors to collect voltage signals, ** is qualitative/semi-quantitative sensors, cannot directly measure ppm accurately, requires calibration**, and faces issues such as temperature and humidity drift and cross-interference.

Typical applications

Breathalyzer, breath alcohol screening
VOC monitoring and alarm for factory organic solvent evaporation, dry cleaning workshops, printing, and painting
Preliminary inspection of lithium battery thermal runaway gas generation (volatile gases from electrolyte)
Simple Air TVOC Alarm (Note: not a dedicated TVOC sensor, high cross-sensitivity)

TGS2630 Parameters

Principle: Metal-oxide-semiconductor MOS
Packaging: TO-5 metal can, φ9.2×12.4 mm, approximately 1.4g
Target gas: R-32 (difluoromethane), which can also detect some A2L refrigerants
Typical detection range: 1000 ~ 10000 ppm R32

Power Supply Conditions:
Heating voltage VH: 5.0V ±0.2V (both AC and DC available)
Circuit voltage VC: 5.0V ±0.2V DC
Heating current IH: 56±5 mA
Heating power consumption: 280 mW (higher than TGS2620 power)
Load resistor RL: minimum 0.45 kΩ, optional as needed
At 5000ppm R32 low: Rs = 0.46 ~ 10 kΩ
Operating temperature: -40 ~ 70°C to avoid condensation
RoHS2 compliance

Pin definition (4-pin TO5, same pin layout as TGS2620)

Pin 1 and 2: Heating wire VH
Pin 3 and 4: Gas Resistor Rs (Series RL Voltage Divider Acquisition)

Features

1. Built-in filtration layer reduces response to ethanol and common organic solvents, making it more suitable for refrigerant scenarios compared to TGS2620. Selectivity is specifically optimized for R32, but cross-interference still exists (hydrogen and some combustible gases still respond).
2. When gas concentration rises → Rs decreases and voltage divider rises, it is suitable for leak threshold alarms, not precision quantitative sensors
3. Figaro pre-calibration modules: FCM2630-C00 / FCM2630-E00, with temperature compensation and factory calibration, directly meeting the air conditioning IEC60335-2-40 refrigerant leak detection standards, no need to adjust the baseline yourself. Figaro technical research…

Typical applications

Refrigerant leak alarm for variable frequency air conditioners, air source heat pumps, and chiller units R32
A2L refrigerant refrigeration equipment with built-in leak detection probes
Commercial refrigeration unit refrigerant monitoring