Visualization ofCO2 concentration
Automatic ventilation

Ultimate IAQ compatible

MarvelMarvel

NMASMA

SeriesNMA Series

SMA Series（ Standard size）

Measure and display indoor CO2 concentration

Visualization ofventilation

Series（Slim half size）

Energy efficiency by proper ventilation control

Improve work efficiency, prevent drowsiness and health hazards

Significant reduction inImproving the working
electricity expenditures and learning environment

Healthy CO2 level withconsideration of energy
efficiency

800-1,000 ppm

CO2concentration

low350ppm

450ppm800ppm

CO1,000ppm

Preferred healthy and normal level outdoors
ASHRAE recommended level
Building Hygiene Control Law (incl.Hospital etc.)

1,500ppm

2,500ppm

Feel drowsy or discomfort,or smell odors

5,000ppm

2concentration

highDamage is expected
if it continues for a long time

School Hygiene
Management Act

Detect and inform the levels of CO2 concentration
CO2 related standards
U.S.A.

Japan

ASHRAE
Building Hygiene Control
recommended value Law（incl.Hospital etc.）

1,000 ppm

School Hygiene
Management Actthanthan
1,000 lessppm
1,500 lessppm

CONTACT USClassrooms

Offices

info@chcsys.net

Planning, Designing, and sales : C.H.C. SYSTEM TOKYO, JAPANPublic spaces

Hospitals

Greenhouses/
Plant factories

Please feel free to contact uswith any questions before purchasing.
Product HP

Visualization of ventilation

Compliant with Ministry of Economy, Trade and Industry"Guidelines for Selection of Carbon Dioxide Concentration Measuring Instruments"

High-precision optical NDIR dual beam sensor, built-in CO2 concentration correction (calibration) function

Specification table

Models395.00 NMA-VRC-II Standard type

NMA-PR-R Standard type

USD（tax excluded）

NMA-PR-RD

USD（tax excluded）

465.00

Data logger
built-in type465.00

USD（tax excluded）

500.00
Half size
NMA-VRC-IIM RS485（Modbus）type USD（tax excluded） SMA-VRC-IIIlogger
NMA-VRC-IID Data
built-in type535.00

USD（tax excluded）

535.00

USD（tax excluded）（AC type）manufacturer's recommended retail price （DC24V type）manufacturer's recommended retail price（DC24V type）manufacturer's recommended retail price

Optical NDIR（non-dispersive infrared absorption）dual beam sensor

Measurement method
ＣＯ2Control by RS485 Modbus RTU,relay output or proportional output

Control dampers by proportional output

Control of ventilation equipment by ON/OFF

Temperature dependent

Large value of ±0.2% or ±2 ppm per 1°C（25℃ standard）

Air pressure dependent

0.13% per 1mmHg with altitude adjustment function（Factory setting is 0m）

Response time

2 minutes or less（90%）

Warm up

In 60seconds

Correction（calibration）
function

Manual correction（calibration）
CO2: Within ±75 ppm or ±5% larger value（0-3,000 ppm）

Accuracy
Usage conditions

Temperature: 0-50℃; Humidity: 95% or less, No condensation（environment with airﬂow of 0.1m/s or more is recommended）

CO2: 0-3,000 ppm

Measurement range

Temperature: 0-50℃

Measurement interval
Relay setting range

Temperature: 0-50℃; Humidity: 95% or less. No condensation

Humidity: 20-90%

CO2: 0-5,000 ppm Temperature: 0-50℃ Humidity: 20-90%

5 seconds（Update Period）

CO2

ALARM1：100-2,980 ppm、ALARM2：120-3,000 ppm

ALARM1：100-4,980 ppm、ALARM2：120-5,000 ppm

Temperature

ALARM1・Temp：0-49 ℃、ALARM2・Temp：1-50 ℃

MAX 2A（DC30V or AC250V）. 1 contact, normally open.ON when AL2 is exceeded, then OFF when AL1 is exceeded（reverse setting is also possible）*Relay output selectable by CO2 or temperature（SMA-VRC-III only）

Relay output
Current output

4-20mA：CO2

4-20mA: CO2 or temperature (opposite to voltage value)

Analog output Voltage output

0-10V：CO2

0-10V: CO2 or temperature (opposite to current value)

Output width

ALARM1〜ALARM2Digital output

0-5,000 ppm and 0-50 ℃

RS485 Modbus RTU（NMA-VRC-IIM/SMA-VRC-III only）

Record CO2 concentration, temperature and humidit y ever y 5 seconds to MicroSD card（included）.
About 2 years with 1GB（NMA-PR-RD/NMA-VRC-IID only）

Data recording
LCD display

All display / CO2 concentration only display / non-display selectable（switchable among 3 patterns）

LED display

3-color switchable lighting depending on CO2 concentration（non-display selectable）

Alarm

Sounds 4 times at ALARM1 or higher; sounds 8 times at ALARM2 or higher. With mute function

Power supply

AC100-240V

All display/CO2 concentration only display/temperature and humidity
only display/non-display selectable（switchable among 4 patterns）

DC24V

Power consumption

Approx. 1.5W
W120×H120×D28 mm ・ 220g

Size/Weight

W75×H120×D22 mm ・ 130g

Life expectancy of Sensor

Approx. 10 years

Product warranty period

1 yearBody size（mm）

SMA Series
3723

23

3775

60

CO2RH

120

84

ENTER

60

DOWN

ENTER

controller

controller

30

Front

Side

Power switch（OFF/AUTO/ON）
Retaining screw

60

Rear

30

Front

Wiring space（notch possible）
9×16 size

Side

Power switch（OFF/AUTO/ON）

4926

OFF AUTO ONOFF AUTO ON

Top surface
Power outlet for maintenance
Retaining screw
Gas inletMicroUSB
socket*Top surface

Retainingscrew
Retainingscrew

In the case ofdata logger built-in type
*The bottom surface varies
depending on the models

MicroSD card slot

Bottom surface

Distributors

Space for wiring

27.5

DOWN

UP61

UP

MODE

18

MODE120

PPM
RH

23 14.5

14.5 23

PPM
TEMP

TEMP

Power inlet
for maintenance

SMA-VRC-III

59

NMA-PR-R

22

83.5

2818120

9

NMA Series

7.5
Gas inlet（used for calibration）

60

Rear

7.5
Communication
hole for wiring

The display and operation buttons/switches can becovered with a cover（Optional）.
Using when display
and button operation
are not necessary.
Prevent erroneous
operation and mischief.
Size:
W79×Ｈ124×Ｄ24（mm）

Bottom surface

Material:
ABS resin

2023.08