PRODUCT INFORMATION

EM-FECS(B) - Evaluation Module for FECS-series Sensors
Description:

The EM-FECS(B) evaluation module is designed toperform the testing and evaluation of the three-electrodeelectrochemical gas sensors in the FECS-series. Since
the output voltage (VOUT) corresponding to the sensitivity
characteristics can be obtained, the characteristics ofthe FECS sensor can be easily evaluated.

Features:* Compatible with all FECS-series sensors* Converts sensor output current to voltage output* Selectable load resistors dependeing on sensor model* Anti-polarization circuit during power OFF period

Operation:

The FECS-series sensor is placed into the sensor socket on the EMFECS(B). If target gas is present, the output current generated fromthe FECS-series sensor (*1) is converted into output voltage. A linear
relationship exists between output voltage and target gas concentration.
By measuring in advance the output voltage in a known target gas
concentration, that gas concentration can be calculated from themeasured output voltage values. (*2)
For more detailed specifications of FECS-series sensors,refer to Product Information for each model.
*2
The main function of this module is to simply convert
sensor output current into voltage output without temperaturecompensation.
*1

Specifications:

Dimensions:
Specification

5.0 ± 0.2V DC

Current consumption<2.0mA

Output voltage (VOUT)- 1.00±0.05V DC in zero air[FECS40-1000, FECS41-250,
FECS43-20, FECS50-100, FECS44100/200/1000/5000]- 2.50±0.05V DC in zero air[FECS42-20, FECS45-10]

Operating conditions

0~60˚C, <95%RH (no condensation)
For more details of operating
conditions, refer to Product
Information for each model.

3.0
5CN1W

CP2431JP7

JP8

VR12

SEN1R

CP111.0

1JP6C

EM-FECS(B)
3.0

FECS-series
sensor1.6

1.6

Input voltage range (VIN)

W RJP

CO (FECS40-1000)
NO (FECS41-250)
NO2 (FECS42-20)
SO2 (FECS43-20)
NH3 (FECS44-100/200/1000/5000)
Cl2 (FECS45-10)
H2S (FECS50-100)

3.0
C

JP5

Target gases

SEN2Sensor
sockets

32.0

Evaluation module for FECS-series
sensors

16.0

Product name

45.0

12.0

3.0

EM-FECS(B)16.5 maxModel No.

4.9maxItem

unit:mm*FECS-series sensor is to be put in the sensor socket asshown in the above photo.
*Suggested female connectors mating to the 5-pin connector(JST MB5P-90S):
JST XHP-5P or JST 05JQ-BTPRODUCT INFORMATION

Schematic Diagram:
VIN(DC5.0v)

2pin

VBASE

3pin

VOUT

261CE

GND
8C2

C1

11102
3

R11000p C3

FB 551k

R12R

22µ/10v

R2

SEN1

13k

4

XCL211B082

W

DC810k

2

2

R11G

1M

104

C93.94v

J-FET(P-ch)
MMBF176

S5pin

GND

3C

C4CN13.94v

R3R

3W4C5CP110kSEN2R1310JP63R15R144.7k

33

JP1R7JP2R833k

7JP3R9100k

IC4(2/2)
C11 OPA2388

JP4R106(0.691v) 5JP7JP8

5R161k104

1kIC2(2/2)/IC3(2/2)

C7

C6 104

1R53410104

R6CP2

1kIC4(1/2)

1OPA2388

82200k10482104

10kC10OPA2388

C5R4IC3(1/2)

OPA2388

3.94v

67104

1JP544pin

NC

L2
L1Lx
Lx

1µ/16v

10µ/10v

53.94v

IC19PVIN
1NC4NC
7AVIN

85v

1pin

1VR1100k43(0.358v～3.585v)

IC2(1/2)

OPA2388

Jumper Pin and Base Voltage Settings(*3)
Sensor ModelNo.

Amplifying factor for
I-V conversion

Target gases

Bias voltage

No need

JP7102.50V

Necessary(*4)

JP833

JP710

JP833

JP710

FECS41-250

NO

Nitric Oxide

FECS42-20

NO2

Nitrogen Dioxide

FECS43-20

SO2Sulphur Dioxide

NH3Ammonia

JP233,000 x

FECS45-10

Cl2

Chlorine

JP4200,000 x

2.50V

Necessary(*4)

FECS50-100

H 2S

Hydrogen Sulfide

JP110,000 x

1.00V

No need

100,000 x

JP4200,000 x

JP3100,000 x+300mV

1.00VCarbon Monoxide

JP3

JP5

Recommended
load resistor (Ω)

CO

10,000 x-Volumeadjustment

FECS40-1000

JP1JP6

Base voltage

FECS44-100
FECS44-200
FECS44-1000
FECS44-5000

JP6-1.00VNo needJumper pins are connected to JP1, JP6 and JP7 respectively at time of factory setting.
Base voltage adjustment method: Please adjust base voltage to 2.5V by VR1 while measuring the voltage value between VBASE (Pin 2)
and GND (Pin 5).
*3*4

Pin connections:
Pin No.

NameDescription

1

VIN

Input voltage

5.0±0.2V DC2VBASE

Base outputvoltage

1.00V±0.05V at timeof factory setting

3VOUTOutput voltage

4-No connection

5GNDGroundSensor output current Is (μA) is calculated from output voltage VOUT (V)between Pin #3 (VOUT) and Pin #5 (GND) using the following formula:
Is= ((VOUT[Gas] - VOUT[Air]) / I-V conversion amp. factor) x 106
where: VOUT[Air] : sensor output voltage in zero air
VOUT[Gas]: sensor output voltage in target gas
Example: When output voltage of FECS 50-100 (typical sensitivity of0.7μA for H2S) are as follows:
VOUT[Air] = 1.00V
VOUT[Gas] = 1.7V		
Is = ((1.7-1.00)/10,000) ×106 ≈ 70μA
* The calculated Is value corresponds to the sensor output in around
100ppm H2S.

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: 08/24

Caution:This module is designed for evaluation of the FECSseries sensors only. Please do not use this module forany other purpose.