PRODUCT INFORMATIONEM26AQS - Evaluation Module for Air Quality Sensors
Features:* Accommodates three models of TGS26 series air quality sensors(TGS2600, TGS2602, TGS2603)* Facilitates evaluation of sensor responses to indoor air pollution* Two types of power supply connectors (USB Type-C or 5-Pinconnector)

Description:
The EM26AQS is a multifunctional evaluation module that simplifies
the evaluation of TGS 26 series semiconductor type air qualitysensors. To use these sensors for air quality monitoring or control
equipment, such as electronic air purifiers, signal processing of thesensor output using the dynamic benchmark renewal algorithm is*Sensor not include
required. This evaluation module includes the signal processing
software required for such applications.
This module converts sensor output voltage into a five-level voltage output using the signal processing software to provide
the Indoor Air Quality Level (VAQL) output. The LED equipped on the module changes color to indicate the Indoor Air Quality
Level (VAQL).
*1 For detailed product specifications of TGS 26 series air quality sensors, please refer to the Product Information for eachmodel.
*2 The main function of this module is to convert output voltage of the sensor to indoor air quality level output and to provide
LED indications without temperature compensation.

Schematic Diagram:
CP1+5V

CP2SW1
Vdd

4312Sensor
VH-CONT

1µF

NC
GND

(Blue)(青)

D1(Green)(緑)

D2(Yellow(黄緑)green) D3

CN3(Orange)(ｵﾚﾝｼﾞ) D4

CP4(Red)
(赤)

D5

SW2-1
SW2-2

SW21MΩ

VOUT
VAQL

1kΩ

SW3AQlebel
レベル出力51kΩ

100kΩ

10kΩ

VIN (+5V)

2kΩ

CN1CP3JP4
VRL-CONT
VRLVss0.1µF

USB-C

Pin Connections(CN1):
Pin No.

Name

Dip switch (SW2) Settings:
Description

Sensor Model

SW2-1

SW2-2
OFF1VC

Circut voltage

TGS2600

OFF

2VOUT

Sensor output

TGS2602

OFFON

3

VAQL

Indoor air quality level output

TGS2603

ONOFF

4NC

No connection

5

GNDGround* Power supply connector USB Type-C or CN1 can be selected by the switch
SW1.
* Sensor resistance (Rs) in kΩ is calculated from sensor output VOUT using
the following formula:
Rs = (Vc / VOUT -1) × RL

* Default factory settings for switches SW2-1 and SW22 are both set to OFF. Please change SW2 settings asnecessary for the sensor model to test.

PRODUCT INFORMATION

Specifications:

Structure and Dimensions:

Gas sensor socket

Specification

55.0

Unit:mmapprox. 45 x 55 x 17 (mm) excluding sensor

0.64

Dimensions

CP2CP3

CN1

D35

2.5

D2SW3

D1
12JP4

SW2

CN2ONmax
3.0

1.6

133.3 0.64

CN3

* TGS 26 series gas sensor is not included in this module. Please insert a gas sensor into the sensor socket properly as shown in the drawing on the right.
* When inserting the sensor into the sensor socket, please make sure that the position of the protrusion is correct. (Please refer to the drawing on the lower right.)
Improper sensor output may occur if the sensor is inserted incorrectly.
* Suggested female connectors for mating with the 5-pin connector (JST MB5P-90S):
JST XHP-5P or JST 05JQ-BT* Please make sure that the 5-pin connector is inserted in the correct direction.
* Note that the USB Type-C connector is for power supply purposes only.

How to insert sensor into module:approx. 1V

BlueClean

2approx. 2V

Green

Mildly polluted

3approx. 3V

Yellow-green

Moderately polluted

4approx. 4V

OrangeHeavily polluted

5approx. 5V

Red

Extremely polluted

CN3_ON

D52

1

CN1_ON1

Air pollution levels

GS1

Color of LED

1

VAQL Output
voltage

CP1

SW1

4

FIGARO EM26AQS

3Air Quality Level Output:
Level

D4

JP

1 - 5V2

Air quality level output

35V max.

CN3_ON

1Sensor output voltage

CN1_ON

25.0 ± 0.2VDC

3Input voltage

D51

TGS2600, TGS2602, TGS2603

SW1GS1Compatible sensor

FIGARO EM26AQS

5 pin connector
JST:MB5P-90S

4Evaluation Module for Air Quality Sensors

CP1EM26AQS

Product Name

1Model No.

D4JP
2

D313CP2CP3CN1

D2SW35D112

JP4SW2

CN2CN3* Air pollution levels are subjective feelings and may vary between individuals.

ONEnsure that the sensor is inserted so thatthe protrusion on the sensor base is facing
the 5-Pin connector.

Basic operation:
1) Set the dip switch (SW2) to match the sensor model being tested. Select the power supply connector,either USB-Type C or 5-Pin connector (CN1),  by setting the position of switch SW1 accordingly. Thenturn on the power supply to the evaluation module.
2) Once powered on, the blue LED will blink for approximately two minutes during the warm-up period.
Then, the blue LED will illuminate, indicating that the module is in normal operation mode.
3) In normal operation, a specific color LED will illuminate, and pin No. 3 of connector CN1 will produce
a VAQL voltage output that varies according to the indoor air quality level.

NOTE:
This module is designed for the evaluation of TGS26-series air quality sensors only andnot for other purposes or applications.
FIGARO ENGINEERING INC.
1-5-11 Senba-nishi
Mino, Osaka 562-8505 JAPAN
Phone: (81)-727-28-2045
URL：www.figaro.co.jp/en/

REV: 02/24

45.0

Item

Unit : mm