3. LCD Display Symbol
Symbol
Meaning
Description
CO2
Concentration ppm
(Parts Per Million)
Ambient CO2 concentration
O2 Concentration Ambient O2 concentration
Alarm
Alarm
icon
Diagnostics
Test communications between
the SEU and RDU
CO2/O2 First
Alarm level
Relay 1 will be triggered when the
CO2 concentration exceeds the
first alarm level or O2
concentration drops below the
first alarm level, the Red 1 LED
will flash, and buzzer will sound.
CO2/O2 Second
Alarm level
Relay 2 will be triggered when
CO2 concentration exceeds the
second alarm level or O2
concentration drops below the
second alarm level. The Red 1 &
Red 2 LEDs will flash, and the
buzzer will sound.
Calibration
Calibrate the CO2 / O2 sensors
when the accuracy deviates from
the actual concentration.
Recover Factory
Setting
Recover factory default settings
and cancel customized settings.
ESC
Indicate the CO2 leakage once
the CO2 level is above the
second alarm level.
Hi
The CO2 concentration is above
5%, or the O2 concentration is
lower than 30%.
Fan
If CO2 > CO2 Alarm Level or
O2<O2 Alarm Level, fan will run.
4. SEU (Sensor Unit) Function Instructions
The SEU (Sensor Unit) should be placed in a room where the CO2 is likely to
accumulate or O2 reduced, such as a room where CO2 canisters or tanks are
stored. The large LCD displays the ambient CO2 & O2 concentration.
The SEU has the “DIAG”, “AL1”, “AL2”“CALI”, “ReFactSet” function. The
“DIAG” function executes communication tests between the SEU and RDU.
The user can do the calibration under the “CALI” mode when necessary. If
data-setting is done incorrectly, the user can use the “ReFactSet” back to the
original factory setting.
There are two alarm levels: “AL1” and “AL2”. Both alarm levels are
adjustable. The first alarm level of CO2 can be set to 5,000ppm, 1%, 1.5%,
2%. The default first alarm level is 1.5%. The first alarm level of O2 can be
set to 18%, 18.5%, 19%, 19.5% or 20%. The default first alarm level is
19%.The second alarm level of CO2 can be set to 1.5%, 2%, 2.5%, 3%,
3.5% or 4% CO2. The default second alarm level is 3%. The second alarm
level for O2 can be set to 16%, 16.5%, 17%, 17.5% or 18%. The default
second alarm level for O2 is 17%.
When the RAD-0200 CO2 &O2 Monitor detects CO2 concentration exceeds
the first alarm level or O2 concentration drops the first alarm level, the red 1
LED will blink and the buzzer will sound intermittently, and the relay will be
triggered. When CO2 concentration drops below the first alarm level, or O2
concentration raises to the first alarm level, the red 1 LED will stop blinking
and the buzzer will stop beeping.
If the concentration of CO2 continues to rise above the second alarm level,
or the concentration of O2 drops below the second alarm level, the red 1 and
red 2 LED’s will both flash together, the tempo of the buzzer will increase,
and the second relay will be triggered. When the CO2 concentration drops
below the first alarm level the red 1 and red 2 LED’s will stop blinking, and
the buzzer will stop beeping. However, the yellow FLT LED will stay on to
show an event has occurred until the RAD-0200 is restarted with the reset
button RAD-0200 or the AC adapter is unplugged and reconnected.
The green LED will light continuously when the power is normally supplied.
Warning: If the ambient CO2 concentration reaches the second alarm level
on SEU & RDU, there will be a safety notice “ESC” displayed on the LCD.
Careful action, such as ventilating the space, must be taken before entering
the room where the SEU is placed.
If the communication cable between the SEU & RDU isn’t connected properly,
the fault LED on the SEU will blink. To fix this, reconnect the cable. If the cable
is accidently inserted into the output port on the RDU, after one minute “Er7”
will flash on the LCD. Unplugging the cable and plugging it into the Input port
will normally correct the problem.
5. RDU (Remote Display Unit) Function Instructions
The RDU (Remote Display Unit) should be placed outside the CO2 storage
room during use. The RDU is connected to the SEU with a CAT5 cable. An 8
meter (26 ft.) cable is supplied, although up to 3 daisy-chained RDUs over 76
meters (250 ft.) using CAT5 cable has been tested. The RDU should be
placed where it can be conveniently observed before entering the room
where the SEU is located. The RDU is a repeater, and displays the
measurements made by the SEU on an easy-to-read digital LCD along with
important safety information.
The RDU has “DIAG” function. The “DIAG” can test the communication
between the SEU and RDU. Resetting the RAD-0200 CO2 and O2 Monitor is
only available from SEU.
6. Safety Notes
Warning: Your safety is very important to us. To ensure to use the product
correctly and safety, please read these warnings and the entire User Manual
before using the product. Otherwise, the protection provided by the equipment
may be impaired. These warnings provide important safety information and
should be observed at all times.
1. Handle the device carefully; do not subject the product to impact or shock.
Otherwise, this may cause the accuracy to drift.
2. Do not place the unit or the adaptor near a heat source. Heat can cause
distortion of the unit, which may result in an explosion or fire.
3. Do not touch the exposed electronic circuitry of the device under
any circumstances, as there is danger of electric shocks.
4. Use only the included power adaptor. Improper power adaptors or power
sources can cause serious damage to the product, or result in injury or
death to the user.
5. Use the “DIAG” function to verify the communication between SEU and
RDU works normally.
6. Make sure that the power adaptor is secured tightly by a plug lock so the
power adapter cannot be disconnected accidently or by hand.
7. Do not enter into the room directly if there has safety notice “ESC”
displayed on the LCD of SEU & RDU. Careful and protective action must
be taken before entering the room where the SEU is installed.
8. Take care of cable connection between SEU and RDU. Make sure the
cable from SEU is connected into the INPUT port of RDU.
9. Ensure the external power supply to a ventilation fan is tested while the
relay is working. If there has no power to the fan, the relay will not turn it on,
which may result in potentially dangerous high CO2 concentration or low
O2 concentration in a confined space.