968-043 Datasheet by SPEC Sensors (a division of Interlink Electronics)

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g spec SENSORS NE W!! Using SPEC’s 110-508 NO; sensor with 0; ﬁlter and impmved low ppb performance!

DGS-NO2 968-043

August 2017

PRODUCTION DATA information is current as of publication date.

Sensors standard warranty. Production processing does not

necessarily include testing of all parameters.

Digital Gas Sensor – Nitrogen Dioxide

NITROGEN DIOXIDE APPLICATIONS

• Air Purification Control

• Air Quality Monitoring

• Industrial Safety Sensing

BENEFITS

 Low Power – 100 μW in standby mode

 Calibrated & Temp. Compensated Output

 Fast Response < 30 seconds

 Simple Digital UART Interface

 Integrated T & RH Sensors

 Robust 10-year Estimated Lifetime

 ROHS Compliant

 Small form Factor

 UART to USB adapter provided

 Lightweight (< 2 oz.)

NEW!! Using SPEC’s 110-508 NO2 sensor with O3 filter and improved low ppb performance!

DESCRIPTION

SPEC Sensors now offers an easy way to add gas sensing to the Internet of Things. Combining our

Screen Printed ElectroChemical sensor technology (SPEC Sensor™) with state-of-the-art electronics and

algorithms, enables easy integration of small, lightweight, high performance, ultra-low power consumption

gas sensing into wireless, portable, and networked solutions.

MEASUREMENT PERFORMANCE CHARACTERISTICS

Based on Standard Conditions 25 ºC, 50% RH and 1 atm

Measurement Range

0 to 5 ppm

Resolution

20 ppb (1)

Measurement Accuracy

15% of reading

Measurement Repeatability (2)

< ± 3% of reading

T90 Response Time (100 ppm step)

< 30 seconds

Power Consumption

100 μW in standby mode

14 mW in measurement mode

Expected Operating Life

> 5 years (10 years @ 25± 10C; 60 ± 30% RH)

Operating Temperature Range

-20 to 40 °C (-30 to 55 °C intermittent)

Operating Humidity Range

15 to 95% (0 to 100% non-condensing intermittent)

Mechanical Dimensions

1.75 x 0.82 x 0.35 in. (44.5 x 20.8 x 8.9 mm)

Weight

< 2 Ounces

NOTES:

1) Based on Standard Deviation of noise at zero, 1 Hz measurement 60 second averaging.

2) When zeroed after 60 minutes of power-on stabilization

3) Based on consecutive measurements of 100 ppm

4) Contact factory for custom calibration for improved measurement performance

SPEC SENSORS

DGS-NO2 968-043

August 2017

PRODUCTION DATA information is current as of publication date.

Sensors standard warranty. Production processing does not

necessarily include testing of all parameters.

ABSOLUTE MAXIMUM RATINGS

Parameter

Conditions

Min.

Rec.

Max.

Units

Maximum Concentration

Short term exposure

1000

5000

ppm

Supply Voltage

Regulated

2.6

3.6

Storage Temperature

Vapor sealed @ 50% RH

̊C

Storage Humidity

Non-condensing, vapor sealed

% RH

Storage Pressure

Vapor sealed

0.8

1.2

atm

Storage Time

Vapor sealed

Months

Operating Temperature

< 10 hours

-40

̊C

Operating Humidity

< 10 hours, Non-Condensing

100

% RH

Operating Pressure

Transient pulses

-.5

atm

Operating Temperature

Continuous

-30

̊C

Operating Humidity

Continuous, Non-Condensing

% RH

Operating Pressure

Continuous

0.8

1.2

atm

ESD Rating

Human Body Model

ELECTRICAL CHARACTERISTICS

Parameter

Conditions

Min.

Typ.

Max.

Units

Supply Current

V+ = 3.3 V

0.03

4.3

Power Consumption

V+ = 3.3 V

0.1

CROSS SENSITIVITY

The following table lists the relative response of common potential interfering gases, and the

concentration at which the data was gathered.

Gas/Vapor

Applied Concentration

(ppm)

Typical Response

ppm NO2

Nitrogen Dioxide

Hydrogen Sulfide

<0.02

Ozone

<0.1

Nitric Oxide

<0.1

Chlorine

<0.5

Sulfur Dioxide

<0.02

Carbon Monoxide

100

<0.02

g spec SENSORS pmn islsgag

DGS-NO2 968-043

August 2017

PRODUCTION DATA information is current as of publication date.

Sensors standard warranty. Production processing does not

necessarily include testing of all parameters.

PACKAGE OUTLINE DRAWING & DIMENSIONS

PINOUT

Electrical connections to the DGS are made via a rectangular female socket connector (Sullins Connector Solutions

P/N: PPPC041LGBN-RC; recommended mate for host board: P/N: PBC08SBAN). This connector also provides

mechanical rigidity on one end of the board. A through-hole is located on the opposite end of the board to provide

additional mechanical connection.

Pin#

Function

Notes

N/C

RXD

TXD

N/C

GND

N/C

V+

Voltage Supply Input: 3.0 to 3.6 V

g SPEC" SENSORS USB to UART BRIDGE SETTINGS

DGS-NO2 968-043

August 2017

PRODUCTION DATA information is current as of publication date.

Sensors standard warranty. Production processing does not

necessarily include testing of all parameters.

QUICK START – TERMINAL PROGRAM OPERATION

1. Download and install a terminal program, such as Tera Term.

2. Connect the DGS to the USB to UART Bridge via the adapter board.

3. Connect the USB to your computer

a. If device drivers are not automatically downloaded and installed, you can find device drivers

for your operating system by searching www.silabs.com for: “CP210x USB to UART Bridge

VCP Drivers”.

4. Determine the COM port that is associated with the module

a. On Windows operating systems, locate and open the Device Manager.

b. The DGS device should be listed under the heading, “Ports (COM & LPT)”, as “Silicon Labs

CP210x USB to UART Bridge (COMXX)”, where XX is the unique port number associated

with the device.

c. Make a note of the unique port number.

5. Open Tera Term and establish a serial connection with the module

a. In the “New Connection” window, select the “Serial” radio button.

b. In the drop down list, select the appropriate COM port, identified above, then Select “OK”.

c. On the Menu bar, select “Setup”, then “Serial port…” Use: USB to UART BRIDGE SETTINGS

 Voltage level: 3.3 V

 Baud: 9600

 Data bits: 8

 Stop bits: 1

 Parity: None

 Flow Control: None

d. Select “OK”

6. Start Continuous Measurement in Terminal Window

a. Type any key to exit low-power standby mode.

b. Press the Enter key (‘\r’) to transmit a single measurement string.

c. Type ‘c’ (lower-case c, without quotation marks) to start continuous output.

d. The format of the output is:

SN, PPB, T (°C), RH (%), ADC Raw, T Raw, RH Raw, Day, Hour, Minute, Second

e. Type ‘c’ to stop the continuous output

f. Type ‘s’ to enter low-power standby mode

7. Initial ZERO (Clean Air) Calibration

a. When first given power after a long period of unpowered storage, the sensor needs to

stabilize in clean air to its zero offset current.

b. WAIT at least 1 hour in clean air while ensuring the computer and USB port have not

gone to sleep.

c. Type ‘Z’ in the terminal window to re-zero the sensor output.

g spec SENSORS Ma nitude Time NOTE: When enlering commands via a serial or soltware allow for a small delay in belween all characters.

DGS-NO2 968-043

August 2017

PRODUCTION DATA information is current as of publication date.

Sensors standard warranty. Production processing does not

necessarily include testing of all parameters.

NORMAL SENSOR STARTUP FROM HAVING NO POWER APPLIED

The electrochemical sensor output has the normal startup profile pictured here. When powering the

sensor, its output will rapidly increase followed by a gradual decrease. Once this process is complete, the

sensor output will be the most accurate and stable. The time and magnitude of this response may vary

depending on the sensor type and the length of time the sensor has been unpowered.

It is recommended that the module remains always on power. For the greatest accuracy, the DGS module

should not be placed in low-power standby mode between measurements. When not in low-power

standby mode, a running average may be implemented to improve signal noise (at the expense of

response time). By default, the running average is set to n = 1 (no averaging). The value of n may range

from 1 to 300.

DGS OPERATION

When the DGS is connected to V+ and GND: The module’s microprocessor will automatically configure

the sensor and circuit for operation and then enter a low-power standby mode. While in standby mode,

critical sensor circuitry remains active.

If the module is powered and in low-power standby mode: Any data (i.e. single key stroke) received on

the UART interface will exit the standby mode. To transmit a single measurement string, press the return

key (‘\r’). There is up to a 1 second delay between when the module receives a command and when the

module transmits a response. To transmit a continuous stream of measurement strings at a rate of once

per second, type ‘c’. To stop the continuous data, type ‘c’ again. When the module is not in standby mode

it measures and averages the data in the background, regardless of the transmission state. To re-enter

the low-power standby mode, type ‘s’.

NOTE: When entering commands via a script or software, allow for a small delay in between all

characters.

SPEC” SENSORS NOTE: When entering commands via a script or soltware allow for a small delay in between all characters.

DGS-NO2 968-043

August 2017

PRODUCTION DATA information is current as of publication date.

Sensors standard warranty. Production processing does not

necessarily include testing of all parameters.

COMMAND LIBRARY

To execute one of the following commands, send the corresponding case-sensitive ASCII character via

UART.

NOTE: When entering commands via a script or software, allow for a small delay in between all

characters.

\r [Enter key] TRANSMIT single measurement string

c CONTINUOUS data output

The module transmits measurement strings at a rate of 1 per second

Press ‘c’ to exit

s STANDBY mode

The module enters a low-power standby mode (press any key to exit).

B BARCODE entry

The module is initially configured at the factory based on the barcode sticker on the

back of the sensor.

Example Barcode: 090115020653 110109 CO 1509 5.21\r (‘\r’ denotes Enter key)

Z ZERO user calibration

The sensor is re-zeroed such that the module output is 0 ppm.

S SPAN user calibration

The sensor nA/PPM value is recalculated such that the output matches the entered

value.

A AVERAGE

Changes the number of samples in the running average (1 to 300)

T TEMPERATURE calibration

Adds offset (positive or negative) to temperature sensor measurement

L LMP91000 manual setting

Allows the user the manually set the LMP91000. Refer to the LMP91000 datasheet

for information on the settings.

Incorrect settings may damage the sensor.

R or r RESETS the module

l LMP910000 read

Transmits the LMP91000 settings.

f FIRMWARE readout

Displays the firmware revision date

e EEPROM readout

Stored module parameters are output for diagnostic purposes.

g spec SENSORS All sensor designs are made for air monitoring @ 1 atm +/- 0.2 atm.

DGS-NO2 968-043

August 2017

PRODUCTION DATA information is current as of publication date.

Sensors standard warranty. Production processing does not

necessarily include testing of all parameters.

EXAMPLE BARCODE PROCEDURE

(‘B’) Remove Sensor and Scan: 090115020653 110401 O3 1509 -12.11 (return key pressed)

Setting OC...done

Setting zero...done

EXAMPLE ZERO PROCEDURE

(‘Z’) Setting zero...done

EXAMPLE SPAN PROCEDURE

(‘S’) Enter span gas value in PPM: 2 (return key pressed after 2)

Setting span...done

EEPROM EXAMPLE OUTPUT

(‘e’) EEPROM Values

nA_per_PPM_x100= -1036

ADC_OC= 32722

ADC_Zero= 32721

ADC_Span= 32390

Temperature_Offset_x1000= -1

T_Zero= 25989

RH_Zero= 31266

T_Span= 26164

RH_Span= 31042

LMP91000 Register 0x10= 3

LMP91000 Register 0x11= 161

LMP91000 Register 0x12= 3

Average_Total= 1

Barcode= 090115020653 110401 O3 1509 -12.11

Serial_Number= 090115020653

Part_Number= 110401

Gas= O3

Date_Code= 1509

Sensitivity_Code= -12.11

IMPORTANT PRECAUTIONS

All sensor designs are made for air monitoring @ 1 atm +/- 0.2 atm. Because applications of use and

device implementation are outside our control, SPEC Sensors cannot guarantee performance in a given

device or application, and disclaims any and all liability therefore. Customers should test under their

own conditions to ensure the sensors are suitable for their requirements.

g SPEC" SENSORS

DGS-NO2 968-043

August 2017

PRODUCTION DATA information is current as of publication date.

Sensors standard warranty. Production processing does not

necessarily include testing of all parameters.

Contact the factory to discuss specific concerns that might damage the sensor performance or life.

 Condensation and Water (1)

 High Temperature Operation (> 40C) for more than 1 month

 Low Humidity Operation (< 15% RH) for more than 3 months

 Highly contaminated air over a prolonged period

 High levels of particles or soot (unless proper filtering is provided)[2]

(1) Use of porous PTFE membrane or filter cap may address this concern)

(2) Use of replaceable filter recommended where dust and particulate is expected.

g SPEC" SENSORS

DGS-NO2 968-043

August 2017

PRODUCTION DATA information is current as of publication date.

Sensors standard warranty. Production processing does not

necessarily include testing of all parameters.

SENSOR STORAGE, HANDLING AND SOLDERING

This information embodies various general recommendations concerning the storage, handling, and manual soldering

conditions for SPEC SENSORS CSPEC Modules. It is only applicable for modules guaranteed by SPEC SENSORS

stated in SPEC SENSORS Sensor Specification Sheet. Moreover, SPEC SENSORS' modules are NOT warranted

and should NOT be used in high temperature soldering (reflow) or pre-tinning baths.

Sensor & Module Handling

Handle sensors with care. Take precautions, including but not limited to the following:

A. DO NOT apply excessive pressure to the top or bottom of the sensor module.

B. Whenever possible, handle or make contact with the sensor module from the sides of the PCB or substrate.

C. Light vacuum pressure is possible during handling, DO NOT apply vacuum over gas sensor port.

D. If the sealed sensor package is opened, DO NOT re-seal using vacuum or nitrogen gas. DO NOT reseal with

desiccant.

E. DO NOT obstruct the gas sensor port by making direct contact with any tape, apparatus, weights, etc.

F. DO NOT use silicone or other conformal coatings around the sensor or gas port-holes.

G. Operators are requested to wear powder free antistatic gloves.

Manufacturing Assembly Floor Environment

SPEC SENSORS recommends that the manufacturing assembly floor environment be maintained at controlled

conditions:

A. Temperature: 18 - 26°C

B. Relative Humidity: 40 to 60%

C. Pressure: 1.0 ± 0.2 atm

Sensor & Module Storage Conditions

The shelf life for sealed, packaged components is 12 months from the pack seal date, when stored in the factory-

sealed bag under the following conditions:

A. Temperature: 5 to 25 °C

B. Relative Humidity: 20 to 80%

C. Pressure: 1.0 ± 0.2 atm

D. Storage Time: 12 months

When moving from Storage Conditions to the Manufacturing Assembly Floor Environment, the sensors should be

allowed to equilibrate at the new conditions for at least 24 hours prior to manufacturing.

Module Attach Soldering Process

Hand solder only. Keep the soldering iron or solder process tool away from the sensor. The sensor should not see

pre-heat temperatures above 70 °C. There have been suggested cases where a heat sink cover over the sensor may

be applicable to protect the sensor during processing. No Application notes to this approach available. Only to be

used as reference only.

A. DO NOT heat sensor above 70 °C

B. Hand or peripheral process type approach

C. Use solder wire alloy with the lowest possible eutectic temperature

D. Use lowest possible soldering iron temperature

E. Contact the host board with the soldering iron at a 45° angle on the solder pad

F. Keep the soldering iron away from the top and bottom of the sensor module

G. DO NOT place in reflow, wave or IR reflow type processes

H. DO NOT place mounted board In a wash

968-043 Datasheet by SPEC Sensors (a division of Interlink Electronics)

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