AGSM user manual

The Allsensing Gas Sensor Module provides an easy way to add gas detectors to the Internet of Things.

Description

The Allsensing Gas Sensor Module (AGSM) provides an easy way to add gas detectors to the Internet of Things. Here are some key features and specifications:

• Gas Calibration: Once the gas calibration is complete, the AGSM sends sensor concentration values (in ppb) using UART communication.

• Response Time: It is not suitable for environments that require a fast response time (T90<30Sec). It is designed for long-term environmental change monitoring.

• Sensor Stabilization Time: A minimum of 30 minutes to 1 hour of sensor stabilization time is required. Temperature Compensation & Gas Sensor Calibration Algorithm: The module applies a temperature compensation and gas sensor calibration algorithm.

• Sensor Signal Value: The sensor signal value (raw data) output from the sensor driving circuit can be checked (23bit adc). Compatibility: The AGSM product can be applied in conjunction with Arduino and compatible products.

• Integration: It can be easily integrated and applied to small, lightweight, high-performance, low-power wireless gas detectors, portable and network solutions.

• Gas Sensors: The AGSM is supplied in a form applied with individual gas sensors for CO, H2S, SO2, NO2, O3.

• Sensor Calibration:

  • If the user has calibration gas and a test environment, Zero calibration and Span Calibration can be performed using communication commands.

  • It is recommended to calibrate the gas sensor (Span Calibration) every six months.

  • The AGSM product was calibrated using a small chamber of 400mL.

AGSM Module

Specifications and Connection Methods

Module Specifications

Item	Specification
Measured Gases	CO, H2S, SO2, NO2, O3 (individual measurements)
Operating Principle	Solid electrolyte electrochemical (3 electrodes)
Measurement Range	### Sensor Specifications
Accuracy	<5% @ Full Range
Communication Output	UART (TTL 3.3V, 5.0V)
Expected Operating Life	> 5 years (10 years @ 25± 10C; 60 ± 30% RH)
Electrical Characteristics
Operating Voltage	DC 3.3V ~ 5.0V
Operating Current	Max 13mA (3.3VDC)
Power Consumption	≤43mW
Environment
Operating Temperature	-20 to 40 °C
Operating Humidity	15 to 95% (Based on Standard Conditions: 25 ºC, 50% RH and 1 atm)

Sensor Specifications

Gas	Range	Resolution	Accuracy	T90 Response Time
Carbon Monoxide (CO)	0~100ppm	0.1ppm	5% of Full range	<30 sec
Hydrogen Sulfide (H2S)	0~10ppm	10ppb	5% of Full range	<30 sec
Sulfur Dioxide (SO2)	0~20ppm	50ppb	5% of Full range	<30 sec
Nitrogen Dioxide (NO2)	0~5ppm	20ppb	5% of Full range	<30 min
Ozone (O3)	0~5ppm	20ppb	5% of Full range	<30 sec

Pin Connection

• Connector(default): Molex 53261, Yeonho 12505WR

• Pin header(option): 2.54 pitch(V:VCC, G:GND, R: Rxd, T: TxD)

AGSM PIN Connection

Dimension

• Size: L X W (33 x 21 mm)

AGSM Module Size

Communication protocols

Defaults

+ Voltage level: DC 3.3 V or 5.0V
+ Baud: 9600 
+ Data bits: 8 
+ Stop bits: 1 
+ Parity: None 
+ Flow Control: None

Commands

Command	Function
<CR>,	Single data output. Output: SN [XXXXXXXXXXXX], PPB [0 : 999999], TEMP [-99 : 99], RH [0 : 99], ADC[ADCCount], TempDigital, RHDigital
C<cr>, c<cr>	Continuous data output. Resets upon reboot and does not store status level in internal memory.
Z	Zero user calibration. Recalculates and calibrates the sensor value to output 0ppm.
B	Barcode entry. Inputs the barcode information recorded on the sensor.
S	Span user calibration. Recalculates and calibrates the sensor's measurement sensitivity by injecting calibration gas (based on PPM).
e	Internal memory readout. Checks the configuration information values stored inside the module.
D<cr>	LED ON/OFF. Status information is not stored in internal memory.
r<cr>	System reset.

Command Examples

\r
    081821011255, 212, 23, 18, 2194921, 23490, 18665

c\r
     081821011255, 212, 23, 18, 2194921, 23490, 18665

S 
    Enter span gas value in PPM:
    Setting span...
    done

Z
    Setting zero...
    done

B
    Remove Sensor and Scan:
    Setting OC...done

e 
    Serial Number= 112020010530
    Barcode= 081821011255 110507 NO2 2108 -28.57
    ADC Zero= 2165186
    ADC_SpanCalValue=  1890818
    Temperature Zero(x1000)= 24366
    Humidity Zero(x1000)= 16797
    Temperature Span(x1000)= 24205
    Humidity Span(x1000)= 17139
    Calibration GAS(x100)(ppm)=  250
    Calibration InA(x100)=  -2857
    Max Range(ppm)= 5
    NoneSensorADC Zero= 2165186
    Firmware Version= 2022-03-23B-04”

r\r
    reset

D\r
    LED OFF
    LED ON

Precautions

• Please use within the specified standards and be careful with connections.

• Use in the vicinity of excessive chemicals may damage the sensor.

• Prolonged exposure to high temperatures and humidity may cause the sensor to malfunction.

• Impacts above a certain threshold may cause temporary malfunctions.

• Failure to follow these instructions may result in product damage.

• It is recommended to use as a safety device or supplementary device for safety reasons.

Manufacturer / Contact (A/S)

• Manufacturer: ㈜ 올센싱 https://www.allsensing.com/

• Address: A2214, 184, Jungbu-daero, Giheung-gu, Yongin-si, Gyeonggi-do, Republic of Korea

• Contact: E-MAIL: [e-mail]

I hope this information is helpful! If you have any other questions, feel free to ask.