Figaro TGS2611-C00 TGS 2611 Gas Sensor For LP Gases Methane (Ø x H) 9.2 mm x 7.8 mm TGS2611-C00 Data Sheet

2

TECHNICAL INFORMATION FOR TGS2611

 is available in two different models with

different external housings but identical sensitivity to
methane gas. TGS2611-C00 possesses small size and
quick gas response, making it suitable for gas leakage
checkers, while TGS2611-E00 uses filter material in its
housing to eliminate the influence of interference gases
such as alcohol, resulting in highly selective response
to methane gas. Both models are capable of meeting
the requirements of EN50194 and UL1484.

1-1   Features

* High selectivity to methane
* Low power consumption
* Small size
* Long life and low cost
* Uses simple electrical circuit

1-2   Applications

* Residential gas alarms
* Portable gas detectors
* Gas leak detectors for gas appliances

1-3   Structure
Figure 1 shows the structure of TGS2611.  Using thick
film techniques, the sensing material (SnO

2

) is printed

on electrodes (noble metal) which have been printed
onto an alumina substrate.  One electrode is
connected to pin No.2 and the other is connected to
pin No.3.  The sensor element is heated by RuO

2

material printed onto the reverse side of the substrate
and connected to pins No.1 and No.4.

Lead wires are Pt-W alloy and are connected to sensor
pins which are made of Ni-plated Ni-Fe 50%.

The sensor base is made of Ni-plated steel.  The caps
of both TGS2611-C00 and TGS2611-E00 are stainless
steel.  The upper opening in both caps is covered with
a double layer of 100 mesh stainless steel gauze
(SUS316). The TGS2611-E00 utilizes a charcoal filter
inside the cap for reducing the influence of
interference gases.

1-4   Basic measuring circuit

Figure 2 shows the basic measuring circuit.  Circuit
voltage (Vc) is applied across the sensor element which
has a resistance (Rs) between the sensor’s two
electrodes and the load resistor (R

L

) connected in series.

When DC is used for Vc, the polarity shown in Figure
2  must be maintained.  The Vc may be applied
intermittently. The sensor signal (V

RL

) is measured

indirectly as a change in voltage across the R

L

.  The Rs

is obtained from the formula shown at the right.

Fig. 1 - Sensor structure

-

x

Formula to determine Rs

Fig. 2 - Basic measuring circuit

: In the case of V

H

, there is no polarity, so pins 1 and 4 can

be considered interchangeable. However, in the case of V

C

, when

used with DC power, pins 2 and 3 must be used as shown in the
Figure above.

Electrodes

Heater

Sensing material

Lead wire

1.5mm

Substrate

1.5mm

(Reverse side)

Lead wire

Stainless steel gauze

Lead pin

Metal cap

TGS2611-C00

TGS2611-E00