RKI Instruments RI-600 User manual

RI-600
Indoor Carbon Dioxide Monitor
Operator’s Manual
Part Number: 71-0517
Revision: 0
Released: 11/7/22

2
Contents
1 Outline of the Product ..................................................................................................................................... 3
Preface............................................................................................................................................................ 3
Purpose of use................................................................................................................................................ 3
Definition of DANGER, WARNING, CAUTION and NOTE............................................................................ 4
Method of confirmation for CE marking type ................................................................................................. 4
(DC specification only).................................................................................................................................... 4
2 Important Notices on Safety............................................................................................................................ 5
2-1. Danger Statements ................................................................................................................................. 5
2-2. Warning Statements................................................................................................................................ 5
2-3. Caution Statements................................................................................................................................. 6
3 Product Components ...................................................................................................................................... 7
3-1. Main unit and standard accessories ....................................................................................................... 7
3-2. Names and functions for each part......................................................................................................... 9
4 How to Install................................................................................................................................................. 11
4-1. Precautions for installation points ......................................................................................................... 11
4-2. Precautions for system designing......................................................................................................... 12
4-3. Installation of main unit .........................................................................................................................14
4-4. Precautions for wiring............................................................................................................................ 16
5 How to Use .................................................................................................................................................... 19
5-1. Before using the monitor.......................................................................................................................19
5-2. Preparation for start-up .........................................................................................................................19
5-3. Basic operating procedures ..................................................................................................................20
5-4. Power-on ...............................................................................................................................................21
5-5. Modes ....................................................................................................................................................22
5-6. User mode .............................................................................................................................................23
5-7. Power-off ...............................................................................................................................................25
6 Alarm Activation and Functions..................................................................................................................... 26
6-1. Gas alarm activation .............................................................................................................................26
6-2. Fault alarm activation ............................................................................................................................27
6-3. External output operation......................................................................................................................27
6-4. Peak hold operation .............................................................................................................................. 28
7 Maintenance ..................................................................................................................................................29
7-1. Maintenance intervals and items ..........................................................................................................29
7-2. Maintenance mode................................................................................................................................30
7-3. Preparing for a Zero and Span Adjustment ..........................................................................................36
7-4. Performing a Zero Adjustment ..............................................................................................................37
7-5. Performing a Span Adjustment .............................................................................................................38
7-6. Environmental Setting ...........................................................................................................................39
7-7. Component Replacement ..................................................................................................................... 46
8 Storage and Disposal.................................................................................................................................... 55
8-1. Procedures to store the monitor or leave it for a long time ..................................................................55
8-2. Procedures to relocate the monitor or use it again ..............................................................................55
8-3. Disposal of products.............................................................................................................................. 55
9 Troubleshooting............................................................................................................................................. 56
10 Product Specifications ................................................................................................................................57
10-1. List of specifications............................................................................................................................ 57
11 Spare Parts List ...........................................................................................................................................58
12 Appendix...................................................................................................................................................... 59
12-1. Detection principle of Non-Dispersive Infrared Ray ...........................................................................59
12-2. Definition of terms ............................................................................................................................... 59

3
1
Outline of the Product
Preface
Thank you for choosing our indoor carbon dioxide monitor RI-600. Please verify that the model number of
the product you purchased is included in the specifications on this manual.
This manual describes the monitor’s specifications and instructions on proper use. All users must read
and understand the operating manual before using the detector.
Note that the contents of this manual are subject to change without notice for product improvement. It is
also prohibited to copy or reproduce this manual, in whole or in part, without permission.
Regardless of warranty period, we shall not make any indemnification for accidents and damage caused
by using the monitor. Make sure to read the warranty policy specified on the instrument’s warranty.
Purpose of use
This carbon dioxide monitor measures carbon dioxide in the air and shows the concentration on the LCD.
The detector converts the gas reading to an analog, 4-20 mA output, signal and also provides an alarm
contact.
The monitor is a safety unit, not an analyzer. Check the specifications before use and properly conduct
measurement in accordance with purposes.

4
Definition of DANGER, WARNING, CAUTION and NOTE
DANGER This message indicates that improper handling may cause serious
damage to life, health, or assets.
WARNING This message indicates that improper handling may cause serious
damage to health or assets.
CAUTION This message indicates that improper handling may cause minor
damage to health or assets.
NOTE This message indicates advice on handling.
Method of confirmation for CE marking type (DC
specification only)
The CE marking is attached to the detector, as shown below, for CE versions. Please confirm the instrument
specification before using. Refer to the Declaration of Conformity that is at the end of this manual if your
instrument has the CE marking label.
CE marking label (Bottom of instrument)
(DC specification, dry battery type only)
CE marking

5
2
Important Notices on Safety
2-1. Danger Statements
2-2. Warning Statements
DANGER
•This is not an explosion-proof unit. Never attempt to measure a gas in an atmosphere over the
lower explosive limit.
WARNING
•Before turning on the monitor, always check that the voltage is compliant with the specifications.
Operating on an unstable power supply may cause malfunctions.
•Do not operate this monitor in a place where combustible/explosive gases or vapors are present.
Operating the monitor in such an environment will lead to extreme dangers.
•Perform a span adjustment at fixed intervals.
•Do not run the monitor’s power cable or remote sensor cable with power cables from another
device or with high-frequency or high-voltage cables.
•If a high-frequency or high-voltage cable needs to intersect with the monitor’s power cable, it
should be orthogonally connected.
•When wiring, be careful not to apply any stresses on the cables by pulling, tightening, twisting,
etc.
•Do not disassemble/modify the monitor. It may invalidate the warranty of the performance.
Changing the settings without understanding them may cause alarm malfunctions. Please use
the monitor properly in accordance with the operating manual.
•Do not use the monitor with it attached to a control device, equipment, etc.
WARNING
•If an abnormality is found in the monitor, contact RKI immediately.

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2-3. Caution Statements
CAUTION
•Do not use a device, such as a transceiver, which transmits a radio wave near the monitor or its
cables. It may affect the measurement. If a transceiver or other radio wave transmitting device is
used, it must be used in a place away from the monitor.
•Restarting the monitor within five seconds after turning it off may cause errors.
•This is not a control unit. It is not allowed to use the external output of the monitor to control other
units.
•This is a safety unit. Make sure to perform regular maintenance to ensure safety. Continuing to
use the monitor without performing maintenance will compromise the sensitivity of the sensor,
thus resulting in inaccurate gas readings.
•Do not pick the sensor or buzzer opening with a sharp-pointed item. The unit may cause
malfunction or get damaged, possibly resulting in incorrect measurements.
•Do not also install the monitor in a place where the monitor may get wet. Ignoring this may cause
the monitor to malfunction.
•This is a precision device. Do not apply strong shock or vibration to the monitor.
•When the case is opened for wiring or other operation, do not touch inner parts. When wiring, be
sure that excessive pressure is not applied to the power cable or remote sensor cable.
•Do not block the vent for the sensor.

7
3
Product Components
3-1. Main unit and standard accessories
After unpackaging the unit, check the monitor and accessories. If there is anything missing, contact RKI.
Main unit
For names and functions of individual parts of the monitor and LCD display, see "3-2. Names and
functions for each part" ( P. 9).
RI-600

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Standard accessories
- Cross-recessed pan head
machine screw (2 pcs.)
- Cross-recessed round head
wood screw (2 pcs.)
- 3.2 m AC power cable (1 pc.) *Supplied only with AC
specification
- Operating manual (1 pc.)
Optional accessories
- Installation board (1 pc.)
- Gas calibration cap (1 pc.)
Outline drawing
(Unit: mm)
CAUTION
•The main unit and sensor unit (remote type) are precision devices. Be careful not to drop the
monitor when installing or uninstalling the main unit or sensor unit. Dropping the monitor may
compromise its original performance or cause malfunctions.
Power switch
Cable outlet
Cable outlet
Cable outlet
Cable outlet
Display
Sensor
part

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3-2. Names and functions for each part
This section describes the names and functions of the individual parts and LCD display that make up the
monitor.
Main unit
Name
Major function
(1) Power switch
Turns the power ON/OFF. Slide the switch up to power on and
down to power off.
(2) MODE button
Hold down this button to enter the user mode.
It is also used to cancel or skip during setup.
(3) ˄button
Used to change the screen and increase numerical values during
setup.
(4) ˅button
Used to change the screen and decrease numerical values during
setup.
(5)
SET button
Used to confirm the setting.
(6)
Buzzer sound opening
Emits operation and judgment sounds. (Do not block it.)
(7)
Sensor part
Detects a gas to be detected. The sensor is inside the cover.
(8)
Screw
Loosen this screw to open the case.

10
Display
Name
Major function
(1)
Operating state display
Displays the operating status. Blinks in normal operation.
(2)
1st alarm display
Lights up or flashes orange during a first alarm state.
(3)
2nd alarm display
Lights up or flashes red during a second alarm state.
(4)
Fault alarm display
Lights up red during a fault alarm state.
(5)
Concentration value
display
Maintenance indicator
Displays the gas concentration.
Maintenance items and others are displayed during setup.
(6)
Unit display
Displays the unit (ppm/vol%) according to the specification.
(7) Gas name display
Maintenance display
Displays the gas name.
Maintenance items and others are displayed during setup.
(8)
AC/DC power display
Lights up when the monitor is operating on AC or DC power.
(9)
This is not used for the monitor.
(10)
This is not used for the monitor.

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4
How to Install
4-1. Precautions for installation points
When installing the monitor, observe the following precautions. Ignoring these precautions may damage
the monitor, resulting in inaccurate gas detection.
<Do not install the monitor in a place with vibrations or
shocks.>
The monitor consists of sensitive electronic parts and must be installed in a
stable place without vibrations or shocks, etc. and where it cannot fall.
<Do not install the monitor in a place exposed to water, oil, or
chemicals, etc.>
When selecting installation points, avoid a place where the monitor is exposed
to liquids such as water, oil, or chemicals.
<Do not install the monitor in a place where the temperature
drops below 0ºC or rises over 40ºC.>
The operating temperature of the monitor is 0 to +40ºC. Install the monitor in a
stable place not exceeding the operating temperature range.
<Do not install the monitor in a place exposed to direct
sunlight or sudden changes in the temperature.>
Avoid a place where the monitor is exposed to direct sunlight or radiant heat
(infrared rays emitted from a high-temperature object) or where the unit
temperature changes suddenly. Condensation may form inside the monitor,
and the monitor cannot adjust to sudden changes in the temperature.
<Keep the monitor (and its cables) away from noise source
devices.>
When selecting installation points, avoid a place where high-frequency/high-
voltage devices exist.
CAUTION
•This is a precision device. Because the monitor may not provide the specified performance in
some places (environments), check the installation environment, then take appropriate actions if
necessary. Because the monitor plays an important role for safety and disaster prevention, it
should be installed appropriately.
•Do not install this product in any of the following locations:
- Outside environments or areas exposed to direct sunlight
- Areas exposed to water
- Areas exposed to ventilation from an air conditioner, etc.
- Areas exposed to soot, smoke, or steam
- Areas where the temperature drops below 0ºC or rises over 40ºC or the temperature changes
suddenly
- Areas with high humidity like a bathroom
- Areas with bad ventilation such as behind a curtain

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<Do not install the monitor in a place where maintenance of the monitor cannot
be performed or where handling the monitor involves dangers.>
Regular maintenance of the monitor must be performed. Do not install the monitor in a place where
the machinery must be stopped when maintenance is performed, where parts of the machinery must
be removed to perform maintenance, or where the monitor cannot be removed because racks or
other things prevent access to it. Do not install the monitor in a place where maintenance involves
dangers (for example, near a high-voltage cable).
4-2. Precautions for system designing
Note the following precautions for system designing of the monitor.
Using a stable power supply
The external output and alarm contact of the monitor may be activated when the power is turned on,
when momentary blackout occurs, or when the system is being stabilized. In such cases, use a UPS
(uninterruptible power system), or take appropriate actions on the receiving side.
The monitor must be provided with the following power supply.
Power supply voltage
100 - 120 VAC ±10% (50/60 Hz) or 24 VDC ±10%
Allowed time of
momentary blackout
Up to 10 milliseconds (To recover from the momentary blackout for 10
milliseconds or more, restart the monitor.)
Example of actions:
To ensure continuous operation and activation, install a UPS
(uninterruptible power system), etc. outside the monitor.
Others
Do not use it with a power supply that has a large power load or high-
frequency noise. If necessary, use a line filter to avoid the noise
source.
CAUTION
•An unstable power supply and noise may cause malfunctions or false alarms.

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Proper use of alarm contact
The monitor’s alarm contact is used to transmit signals to activate an air-conditioning control.
The specifications for the external output gas alarm contact of the monitor are based on the resistance
load conditions. If inductive load is used at the alarm contact, the following errors will likely occur due to
counter electromotive force generated at the contact:
- Defective insulation or defective contact at the relay contact
- Damage of any electric parts due to high-voltage generated inside the monitor
- Abnormal operations by an out-of-control CPU
If a load is activated, the following measures must be taken to stabilize the monitor’s operation and to
protect the alarm contact:
- Relay it with an external relay at a lower voltage of 100 VAC or below (contact amplification). At the
same time, the surge absorbing part SK1 suitable for the specifications must be attached to the
external relay.
- In addition, the surge absorbing part SK2 must be attached to the loaded side of the external relay if
necessary.
- For certain load conditions, it is recommended that the surge absorbing part be attached to the contact.
It must be attached to an appropriate location by checking how the load is activated.
CAUTION
•While in a de-energized state, the b contact (break contact) may be opened momentarily by a
physical shock, such as external force.
•When the b contact is selected for the alarm contact, take appropriate actions to prepare for a
momentary activation, for example, add signal delay operation (approximately one second) to the
receiving side of the b contact.
RI-600
CAUTION
•In principle, do not activate inductive load at the alarm contact of the monitor. In particular, never
use an inductive load to activate a fluorescent lamp or motor, etc.
•If an inductive load is activated, relay it with an external relay (contact amplification). However,
because the coil of an external relay also involves inductive load, select a relay at a lower voltage
(100 VAC or below), and then protect the contact of the monitor with an appropriate surge
absorbing part, such as a CR circuit.
Alarm contact
Power
supply
Power
supply
Coil
External relay
(Lower voltage relay)
Load
*SK1, SK2: Surge absorbing part

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4-3. Installation of main unit
Install the main unit on the wall 50-180 cm from the floor.
If wall screws are available, remove the screw at the lower part of the main unit to open the cover and
install the unit using the mounting holes on the back of the unit.
NOTE
•To install the main unit to the wall with screws, use the mounting holes on the back of the unit
according to the following procedure.
(1) Loosen the screw at the lower part of the main unit and open the surface cover of the case.
(2) Push both sides of the monitor until it clicks.
(3) Open the surface cover.
(4) Fix the main unit with two screws (M4) through the mounting holes.
(5) Put the surface cover back on the case and tighten the screw at the lower part of the main unit.
CAUTION
•Install the sensor in a place not directly exposed to ventilation from an air conditioner.
•Sudden changes in the temperature may cause the readings not to come back.
Cable outlet
Mounting hole (for M4
screw)
*Supporting the switch
box
1
2
3
4

15
<Maintenance Space>
If the installation board (option) is used, secure an installation space above the unit so that it can be
installed by sliding.
Installation dimension drawing (Installation board not used)
Compatible with JIS single switch box
Secure as
installation space
Installation dimension drawing (Installation board used)

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4-4. Precautions for wiring
If the monitor operates on AC or DC power, or inductive load is used at the alarm contact, wiring work is
required. The following cables are recommended for wiring the monitor with the power supply, signal
cable and contact.
<Recommended Cables>
For AC power
Solid wire/stranded wire: 0.2 - 1.5 mm
2
For DC power
CVVS: 0.2 - 1.5 mm
2
For signal cable (4 - 20 mA/0 - 1 V)
CVVS: 0.2 - 1.5 mm
2
For contact
Cable such as CVV (0.2 - 1.5 mm
2
) Up to 4 cores
<Cable Connection Conditions>
Connectable cable, bare wire length and connection tools are as follows:
- Cable: 0.2 - 1.5 mm2
- Bare wire length: 10 - 11 mm
- Connecting tools: Dedicated screwdrivers manufactured by WAGO and equivalent (edge width 3.0 to
4.5 mm x 0.5 mm)
<Compatible Bar Terminal>
For a bar terminal, the following items are available.
- Bar terminal (ferrule): Model 216 Series (manufactured by WAGO)
- Crimping tool: Model VarioCrimp 4 (206-204) (manufactured by WAGO)
CAUTION
•Be careful not to damage the internal electronic circuit when wiring. In addition, be careful not to
apply stresses on the monitor when (overweight) cables are installed.
•The power and signal cables must be wired separately from the motor power cables.
•When stranded wires are used, prevent wires from contacting each other.
CAUTION
When the wire insulation is peeled off, the bare wire length must be 10mm.
•Improper clamping of the wire due to a shorter bare wire length may cause defective electric
conduction or heating.
•Catching the wire insulation due to a shorter bare wire length may cause defective electric
conduction or heating.
•Exposing the wire due to a longer bare wire length may cause defective insulation or a short
circuit.
•Be careful not to break up the wire. If the wire is broken up when inserted to the terminal, this may
cause defective insulation or heating.
CAUTION
•A bar terminal of the specified model must be used. Using other bar terminals invalidates the
warranty of the performance.

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How to connect to terminal plate
When cables (wires) are connected to the terminal plate inside the main unit, use the dedicated
screwdriver or a compatible flathead screwdriver.
When connecting a stranded wire, be sure to press the push button and open the spring while connecting
the wire.
1
Push the push button straight
downward using the compatible
screwdriver or equivalent to
open the spring.
2
Insert a wire with a specified
bare wire length (10 mm) until
the end of it reaches the
deepest point.
3
Release the screwdriver.
The wire is connected.
NOTE
<Compatible Screwdriver>
When opening the spring, use the compatible screwdriver manufactured by WAGO or equivalent (a
screwdriver with an edge width of 3.0 to 4.5 mm x 0.5 mm which can fully open the spring: See the table
below). In doing this work, be careful not to apply excessive force. Ignoring this may damage the
housing/push buttons or cause the push buttons to break.
Compatible screwdriver manufactured by WAGO
Screwdriver (M) straight type
210-120J
Screwdriver (M) straight type (short shaft & grip)
210-350/01
210-657
Screwdriver (M) straight type (insulated shaft type)
210-720
CAUTION
•Always use the correct tool when wiring the instrument.
•Do not insert more than one wire into one wiring hole. If the total size (mm2) of two or more wires is
within the maximum wire connection range of the terminal plate, it may cause reduced spring clamping
force, defective insulation due to clogged wire sheath, defective contact, or loose wires.

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Figure of terminal plate
The overview of the terminal plate inside the main unit is as follows:
<For Connecting AC Power>
<For Connecting DC Power>
For external output signal
(4 - 20 mA/0 - 1 V) (TN2)
1: (+)
2: (-)
AC power (TND)
100 - 120 VAC ± 10% (50 Hz/60 Hz)
1: L
2: N
3: Not used
Terminal board for AC power
Terminal board for DC power
DC power (TND)
24 VDC ± 10%
1: (+)
2: (-)
3: N.C
For contact (TN3)
1 - 2: ALM1 (First)
3 - 4: ALM2 (Second)

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5
How to Use
5-1. Before using the monitor
Users must follow the operating precautions. Ignoring the precautions may damage the monitor, resulting
in inaccurate gas detection.
5-2. Preparation for start-up
Check the following points before monitoring for carbon dioxide.
- Before turning on the power, check that the monitor is installed properly and that the external wiring is
done properly.
- Check that the power supply voltage is compliant with the specifications.
- Because the external contact may be activated during the adjustment, take measures to prevent an
activated contact from affecting external circuits.
CAUTION
•After you have received the monitor, start using the monitor within the specified operation start
limit of its sensor.

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5-3. Basic operating procedures
Normally, the detection mode is activated after the power is turned on.
WARNING
•When the monitor enters each mode from the detection mode while an alarm is activated, the
alarm contact is released.
The monitor is restarted
after recovering from fault.
<Detection Mode>
<Gas Alarm Status>
(long press)
<Fault Alarm Status>
<Maintenance Mode>
(long press)
<User Mode>
ＣＯ2
ＣＯ2
ＣＯ2