Riken Keiki CO2RK-Lite User manual

PT2E-3380
CO2Monitor
CO2RK-Lite
Operating Manual

Contents
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Contents
1. Product Overview .........................................................................................................................................................4
1-1. Introduction .........................................................................................................................................................4
1-2. Intended use .......................................................................................................................................................5
1-3. DANGER, WARNING, CAUTION, and NOTE...................................................................................................6
1-4. Checking markings .............................................................................................................................................7
2. Important Safety Information ........................................................................................................................................8
2-1. Warning information............................................................................................................................................8
2-2. Caution information.............................................................................................................................................9
2-3. Radio law certification...................................................................................................................................... 10
2-4. Installation precautions .................................................................................................................................... 13
3. Product Configuration................................................................................................................................................ 15
3-1. Main unit and standard accessories................................................................................................................ 15
3-2. Part names and functions................................................................................................................................ 16
3-3. Display ............................................................................................................................................................. 18
4. Usage Instructions..................................................................................................................................................... 20
4-1. Turning the power on and off........................................................................................................................... 20
4-2. Checking the carbon dioxide concentration (LCD display) ............................................................................. 21
4-3. Turning the buzzer on and off.......................................................................................................................... 22
4-4. Checking the peak reading and changing alarm setpoints ............................................................................. 22
5. Functions ................................................................................................................................................................... 24
5-1. Alarm activation (Ventilation alert function) ..................................................................................................... 24
5-2. Fault alarm activation....................................................................................................................................... 25
5-3. Automatic adjustment function ........................................................................................................................ 26
5-4. Smartphone app .............................................................................................................................................. 27
6. Storage and Disposal ................................................................................................................................................ 28
6-1. Procedures for storage or when not in use for extended periods ................................................................... 28

Contents
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6-2. Product disposal .............................................................................................................................................. 28
7. Troubleshooting ......................................................................................................................................................... 29
8. Product Specifications ............................................................................................................................................... 31
8-1. Specifications list ............................................................................................................................................. 31
8-2. Product warranty.............................................................................................................................................. 32

1. Product Overview 1-1. Introduction
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1
Product Overview
1-1. Introduction
Thank you for purchasing the CO2RK-Lite (“the product” hereinafter).
This operating manual describes how to use the product correctly. Make sure you read and fully understand all the
information provided in this operating manual before use.
The contents of this operating manual are subject to change without notice to allow product improvements. Any
unauthorized duplication or reproduction of this operating manual is prohibited, whether in whole or in part.
Regardless of the warranty period, Riken Keiki does not accept any liability for accidents or damage resulting from
use of the product.
Be sure to read the warranty policy set forth on the warranty.

1. Product Overview 1-2. Intended use
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1-2. Intended use
The product is designed to monitor carbon dioxide concentrations in indoor environments. The product displays
carbon dioxide concentrations on the LCD screen and alerts the user via the LCD screen color (green, orange, or
red) and a buzzer if carbon dioxide concentrations reach alarm setpoints set within the detection range (ventilation
notification concentrations).
The product incorporates a nondispersive infrared absorption (NDIR) sensor. The sensor reacts directly to carbon
dioxide concentrations within indoor environments. It adopts a measurement principle unaffected by interference from
sterilizing alcohol such as ethanol.
The product is available in both Bluetooth® and non-Bluetooth® models. The Bluetooth® model allows viewing of
carbon dioxide concentrations on the app screen of smartphones or other devices.
Check the markings on the model as described in ‘1-4. Checking markings’ to confirm the product version before use.
The product is not an analyzer designed to perform quantitative analysis/measurement or qualitative analysis of
gases. Use it appropriately for your intended purposes.

1. Product Overview 1-3. DANGER, WARNING, CAUTION, and NOTE
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1-3. DANGER, WARNING, CAUTION, and NOTE
This operating manual uses the following categories to indicate potential damage/hazards if the user disregards the
information provided and uses the product incorrectly:
DANGER This indicates situations in which improper handling may result in fatal or
serious injury or significant property damage.
WARNING This indicates situations in which improper handling may result in serious
injury or significant property damage.
CAUTION This indicates situations in which improper handling may result in minor
injury or minor property damage.
Additionally, usage recommendations are indicated as follows:
NOTE This indicates items that will be helpful to know when using the product.

1. Product Overview 1-4. Checking markings
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1-4. Checking markings
The nameplate affixed to the product provides various markings (CE marking, FCC ID, technical compliance
marking). Check the actual product specifications before use. For CE marking models, please refer to the
‘Declaration of Conformity’ provided at the end of this manual.
Nameplate
location
CE
marking
Bluetooth® model
Non-Bluetooth® model
Technical compliance
marking
FCC ID

2. Important Safety Information 2-1. Warning information
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2
Important Safety Information
To maintain product performance and to ensure safe use, always observe the following WARNING and CAUTION
instructions:
2-1. Warning information
W
ARNING
Do not pull, clamp, twist, or otherwise apply stress to the cable.
Do not disassemble or modify the product. Any attempt to disassemble or modify the product will void
product performance guarantees.
Use the product only as described in this operating manual.
Do not use the product with control devices or other equipment.
Use the AC adapter provided.
The product is available in both Bluetooth® and non-Bluetooth® models.
For information on Bluetooth® wireless communication, refer to ‘2-3. Radio law certification’.
W
ARNING
If an abnormality is discovered in the product, contact Riken Keiki immediately. Visit our website for
information on the nearest Riken Keiki office.
Website: https://www.rikenkeiki.co.jp/

2. Important Safety Information 2-2. Caution information
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2-2. Caution information
CAUTION
Do not use walkie-talkies or other radio transmitting devices near the product or its cables. Use of such
devices near the product may affect measurements.
The product may not function correctly if the power is turned on once again within five seconds after turning
it off.
Do not poke the sensor or buzzer sound opening with sharp or pointed items. Doing so may result in
malfunctions or damage to the product, preventing accurate measurements.
Do not allow the product to come into contact with water. Do not install the product in locations where it may
be exposed to water. The product is not waterproof or splashproof. Exposure to water will result in
malfunctions.
The product is a precision device. Do not subject the product to strong impact or vibration such as by
dropping.
Avoid contact with internal components after opening the case.
Do not block the sensor vent.

2. Important Safety Information 2-3. Radio law certification
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2-3. Radio law certification
This product is certified as complying with radio laws in individual countries and regions as follows.
The following actions are prohibited by radio laws. The user and/or retailer may be subject to punishment if prohibited
actions are committed.
・Use in countries or regions in which radio law certification has not been obtained
・Sale in countries or regions in which radio law certification has not been obtained
・Disassembly or modification of the product
・Removal of certification labels from the product
If this product is used aboard marine vessels, the radio laws of the country bordering the territorial waters shall apply.
In such cases, use shall be prohibited in countries or regions in which radio law certification has not been obtained.
Check to confirm that industrial, scientific, and medical equipment (e.g., microwave ovens), on-premises radio
stations for mobile identification used in plant manufacturing lines (radio stations requiring a license), and specified
low-power radio stations are not operated in the frequency band (2.4 GHz) used by the product. If the product causes
radio interference to a radio station for mobile identification, take measures to eliminate radio interference—for
example, using the product in a different location or stopping radio emissions.
The countries where wireless communication can be used vary depending on the specifications.Please check the
nameplate attached to the product.
Wireless specifications
Wireless
communication
Protocol: Bluetooth Low Energy
Version: Ver. 4.2
Frequency: 2,402 - 2,480 MHz
Modulation: FSK
Output: Maximum 6 dBm

2. Important Safety Information 2-3. Radio law certification
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Radio law
certification
(Country/region)
Details
Radio Act
(Japan)
This product contains radio equipment certified to comply with technical standards in
accordance with the Radio Act. Accordingly, a radio station license is not required when
using this product.
Construction design certification number: 001-A07864
Wireless frequency: 2,402 MHz - 2,480 MHz
Maximum wireless output: 6 dBm
RE Directive
(EU Countries)
We declare that this equipment complies with the basic requirements of Directive
2014/53/EU and other relevant provisions. Connect to the network with radio waves of
frequency 2.4 GHz band and maximum output 6dBm.
FCC compliance
(United States)
This device complies with part 15 of the FCC Rules. Operation is subject to the following
two conditions: (1) This device may not cause harmful interference, and (2) this device
must accept any interference received, including interference that may cause undesired
operation.
FCC CAUTION
Changes or modifications not expressly approved by the party responsible for compliance

2. Important Safety Information 2-3. Radio law certification
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could void the user’s authority to operate the equipment.
Note: This equipment has been tested and found to comply with the limits for a Class A
digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the instruction manual,
may cause harmful interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference in which case the user will be
required to correct the interference at his own expense.
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled
environment and meets the FCC radio frequency (RF) Exposure Guidelines. This
equipment has very low levels of RF energy that is deemed to comply without testing of
specific absorption rate (SAR).

2. Important Safety Information 2-4. Installation precautions
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2-4. Installation precautions
Be sure to observe the following precautions when installing the product.
Failure to comply with these precautions may result in product failure or improper monitoring.
NOTE
Keep the measurement unit away from doors, windows, and vents and at least 50 cm away from people.
* Taken from Ministry of Health, Labour and Welfare ‘Winter ventilation methods for improving poorly-ventilated
enclosed spaces’ (published November 27, 2020)
CAUTION
The product is a precision device. The specified performance may not be achieved depending on the location
(environment) in which the product is installed. Check the installation location environment and implement
appropriate remedial measures where necessary.
Do not install the product in the following locations:
Locations subject to direct sunlight or outdoors
Locations exposed to water, oil, chemicals, or dust
Locations exposed to drafts from air conditioning or other sources
Locations exposed to soot, smoke, or steam
Locations below 0 °C, over 40 °C, or subject to sudden temperature fluctuations
Humid locations such as bathrooms or locations subject to condensation
Poorly ventilated locations such as behind curtains or other objects
Locations where corrosive gas is present

2. Important Safety Information 2-4. Installation precautions
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<Do not install the product in locations subject to vibration or impact.>
The product contains precision electronic components. Install the product in a stable location
free of vibration, impact, and risk of falling.
<Do not install in locations exposed to water, oil, or chemicals.>
Avoid installing in locations where there is a risk of splashing water, oil, chemicals, or other
liquids.
<Do not install in locations where temperatures can fall below 0 °C or exceed
40 °C.>
The operating temperature range for the product is between 0 °C and 40 °C. Install in a
location where temperature is stable and does not exceed the operating temperature range
during use.
<Do not install in locations subject to direct sunlight or sudden temperature
changes.>
Avoid locations subject to direct sunlight or radiant heat (infrared radiation from high-
temperature bodies) and locations subject to sudden temperature changes. Condensation
may form inside the product, or the product may be unable to adjust to sudden temperature
fluctuations.
<Install away from noise-emitting devices (main unit and cables).>
Avoid installing in locations where high-frequency or high-voltage devices are present.

3. Product Configuration 3-1. Main unit and standard accessories
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3
Product Configuration
3-1. Main unit and standard accessories
Unpack and check the product and accessories.
If anything is missing, contact Riken Keiki.
<Main unit and standard accessories>
Main unit Standard accessories
CO2RK-Lite
AC adapter
Inspection report:
×1
Product warranty:
×1
Operating manual:
×1

3. Product Configuration 3-2. Part names and functions
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3-2. Part names and functions
This section describes the names and functions of the various parts of the product and the LCD display.
(2) (3) (4)
(5)
(8)

3. Product Configuration 3-2. Part names and functions
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Name Main function
(1) Power switch Turns the power on and off. Slide upward to turn the power on, and slide downward to
turn the power off.
(2) MODE button Use this button to cancel a setting while making settings.
(3) △button Used to select the PEAK/1st alarm value/2nd alarm value display
Used to select the screen when making settings and to increment input values
(4) ▽button Used to select the screen when making settings and to decrement input values
(5) SET button Used to confirm a setting when making settings
(6) Buzzer sound
opening Emits operating and judgment sounds. (Do not block.)
(7) Sensor Detects the detection target gas. The sensor is located behind the cover.
(Do not block.)
(8) Stand attachment
holes Used to insert and secure the stand

3. Product Configuration 3-3. Display
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3-3. Display
Name Main function
(1) Operating status icon Indicates the operation status. Blinks when normal.
(2) 1st alarm icon Lights up or blinks when a 1st alarm occurs.
(3) 2nd alarm icon Lights up or blinks when a 2nd alarm occurs.
(4) Fault alarm icon Lights up when a fault alarm occurs.
(
1
)
(4)
(3)
(2)
(5) (6)
(7)
(9)(8) (10)

3. Product Configuration 3-3. Display
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(5) Concentration display
Maintenance display
Displays carbon dioxide concentrations.
Displays maintenance items when making settings.
(6) Units display Displays the units (ppm).
(7) Gas name display
Maintenance display
Displays the gas name. [CO2] is displayed.
Displays item names when making settings.
(8) Power supply indication Lights up when the power is turned on.
(9) Not used with this product
(10) Buzzer on/off icon Lights up when the buzzer is turned off (muted).

4. Usage Instructions 4-1. Turning the power on and off
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4
Usage Instructions
4-1. Turning the power on and off
・Before turning on the power switch, check to confirm that the product has been correctly installed.
・Slide the power switch up to turn on and down to turn off.
Power on
▼
▼
▼
Initialization
(approximately 25 seconds)
▼
▼
▼
Measurement screen
ON
OFF
CAUTION
Never turn the power off during initialization. Doing so may result in malfunctions.
When using the product for the first time or after storing for extended periods, place outdoors or in a well-
ventilated location with the power turned on for at least 24 hours to allow time for the automatic adjustment
function to activate.