Oceanus OC-904 User manual

OC-904
Portable Gas detector
Operating Manual
Henan Oceanus

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Portable Gas Detector OC-904 Instruction
(Please read through this instruction before using the device)
1. Description
OC-904 is a Portable gas detector which is applicable for one-to-four gas
detection including combustible gas, oxygen and toxic gas. It is possible to
combine different sensors to make up 2 in 1, 3 in 1 or 4 in 1 gas detector. The
standard four in one gas detector is for combustible gas (CH4), O2, CO and
H2S.
With the large LCD screen, solid ABS materials body and accurate audible-
visual-vibration alarm, OC-904 can detect the hazardous gas in severe
operating environment and alert the operator for preventive measure in time.
2. Specifications
1 Keys 6 Sensor (CO)
2 LCD display 7 Sensor (O2)
3 Main body 8 Sensor (Ex)
4 Sensor (H2S) 9 Buzzer
5 Light alarm 10 Charge hole

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Features
• Small figure, portable and firm
• Audible-visual-vibration alarm
• Large screen digital display for the measurement value and alarm status
• Self-checking for the display, battery, sensor and alarm status when start up or
when necessary.
• Regulation alert with glitter or sound signal
• Outstanding audio signals alarm
• Low cost for maintain
• Support multi gas detection for combustible gas, toxic gas or oxygen.
Technical Parameter
Detecting Gas Detecting Range Accuracy Resolution
Resp
o
nse
t
i
m
e
Oxygen (O2) 0-30%VOL ＜±3%(F.S) 0.1%VOL ≤15s
Combustible gas (Ex) 0-100%LEL ＜±3%(F.S) 1%LEL ≤5s
Carbon Monoxide (CO) 0-1000ppm ＜±3%(F.S) 1ppm ≤25s
Hydrogen Sulfide (H2S)
0-100ppm ＜±3%(F.S) 1ppm ≤30s
Sulfur Dioxide (SO2) 0-100ppm ＜±3%(F.S)
0.1ppm ≤30s
Nitrous Oxide (NO) 0-250ppm ＜±3%(F.S) 1ppm ≤60s
Nitrogen Dioxide (NO2)
0-20ppm ＜±3%(F.S) 0.1ppm ≤25s
Chlorine (Cl2) 0-20ppm ＜±3%(F.S)
0.1ppm ≤30s
Chlorine Dioxide (ClO2)
0-20ppm ＜±3%(F.S) 0.1ppm ≤30s
Ammonia (NH3) 0-100ppm ＜±3%(F.S)
1ppm ≤50s
Hydrogen (H2) 0-1000ppm ＜±3%(F.S)
1ppm ≤60s
Hydrocyanic Acid (HCN) 0-50ppm ＜±3%(F.S) 0.1ppm ≤200s
Chlorine Hydride (HCl) 0-20ppm ＜±3%(F.S) 0.1ppm ≤60s
Phosphine (PH3) 0-20 / 1000ppm
＜±3%(F.S)
0. 1 / 1ppm ≤25s

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Ozone (O3) 0-20ppm ＜±3%(F.S)
0.01ppm ≤50s
(Remark：Some gas types are not listed. If you have special
request for the applicable gas or detecting range, please contact us.)
Sampling Methods：Diffusion
Battery：3.7V Li-Ion rechargeable battery
Continuous Working Period：11 hours (for combustible gas);
200 hours (for oxygen or toxic gas)
Gas Sensor Type：Catalytic combustion (for combustible gas);
Electrochemical (for oxygen or toxic gas);
Gas Sensor Performance Life: 3 years (catalytic combustible sensor);
2 years (electrochemical sensor);
Data storage: with the data storage function with memory capacity of 1000
alarm records.
Display: Large-screen LCD
Alarming Method: Audible-visual-vibration alarm
Direct Readout: gas concentration value, battery energy, alarm status
Explosion-proof Grade: Ex ibd IICT3
Protection Grade: IP54
Operating Temperature: -10~ 40℃
Operating Humidity: 5~90%RH
Dimensions: 110mm*60mm*30mm
Weight: 210g (with the charger)
Warranty: 2 years
3. Operating Instruction
Power On
When power off with enough electricity, press the key “ ” for about
3 seconds, the device will start up and display software version, then

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begin initializing with 100-second countdown. If the electricity is
empty, please don’t power it on. When low power, the device may
start up but will be automatically power off after the prompt.
Power Off
In working state, press the key “ ” uninterruptedly for about 2 seconds,
the device will power off.
Low Voltage
When the battery electric quantity is lower than the pre-set level, the acoustic
under-voltage alarm will be activated to remind the operator to charge up the
battery. At the same time, the under-voltage signal will also glitter on the
screen. When the power is exhausted, the device will automatically power off.
When the under-voltage alarm occurred, please power off the device and charge
up the battery. The charging period should be about 3 ~ 5 hours.
3.1 Keys Instruction
Power on/off Key Menu Key Up Key Down Key
·Power on ·Enter menu ·Select the option ·Select the option
·Power off ·Confirm setting ·Add the value ·Minus the value
·Exit ·Activate backlight ·Activate backlight
3.2 Self-checking and Preheating
Press the key “ ” to power on, after displayed the software version, the
device will preheat during 100-second countdown, it is the process of self-
checking for energy, sensor, alarm, etc. The display during this period is as

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below,
After preheat, it will enter working mode directly.
Remark: If the self-checking is failed, the device needs to repeat the self-
checking. If failed again, please contact the distributor or manufacturer.
3.3 Working Mode
The gas detector is diffusion sampling. When operating, it is able to be carried in
hand or hung on waist belt. After power on, it will enter working mode to
measure the gas concentration diffused into gas sensor. Usually, the targeting gas
will be taken into gas sensor by the air flow. When the sensor contact the gas, it
will response and display measurement value. If user needs to remotely measure
the gas concentration, suction sampling is available with an external pump.
3.3.1 Gas Alarm
There is preset two-grade alarm in the gas detector, Grade-Ⅰalarm value (for
combustible gas & toxic gas it is low alarm, for oxygen it is high alarm) and
Grade –Ⅱ alarm value (for combustible gas & toxic gas it is high alarm, for
oxygen it is low alarm). User can set and adjust the alarm value freely.
Remark: For all gas types, except oxygen, the Grade-II alarm value is higher
than Grade-I alarm value.

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If the gas concentration exceeds the preset alarm level, the alarm alert signal will
displayed on the screen, also, related alarm grade will displayed as “Alarm1” or
“Alarm2”.
If the gas concentration exceeds the full range scale, except alarm, the full scale
signal will also displayed and glittering.
3.3.2 Working status prompts
There is an audible-visual alarm every 5 minutes, to alert user the gas detector is
in normal working mode. User can set this function to be on or off, or change
the alarm mode (referring to the instruction of setting mode). The default setting
of this function is off when leave factory.
3.4 Setting Mode
Auction: In setting mode, the gas detector will stop measurement working.
In working status, press “ ” key to enter main setting menu, below
submenu will be displayed:
1. System Setting
2. Zero Calibration
3. Records View
4. Language (Chinese or English Menu)
Press “ ” or “ ” key to select the submenu, press “ ” key to
enter or press “ ” key to exit.
3.4.1 System Setting
In main setting menu interface, press “ ” or “ ” key to select “System

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Setting” option, and then press “ ” key to enter. Press “ ” key can
return to main setting menu. There are below options in this sub menu,
1. Alarm Value
2. Time Setting
3. Gas Calibration
4. Alarm Setting
Use the “ ” or “ ” key can select the option need to modify.
Alarm Value
Select this option and press “ ” key to enter, related information of
sensor channel, gas type and alarm value will be displayed as below (take
standard 4 in 1 gas detector as example),
Press “ ” or “ ” key to select the sensor channel need to modify, press
“ ” key to confirm the selection. Press “ ” or “ ” key to modify the
alarm value, press “ ” key to confirm or press “ ” to exit.

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Time Setting
Select this option and press “ ” key to enter, related information of date
and time will be displayed as below,
Press “ ” or “ ” key to select the data need to modify, press
“ ” key to confirm or press “ ” to exit.
Gas Calibration
The device has been calibrated when leave the factory, so it need not calibrated
when first use. After used for a period, or when there is measurement error,
please calibrate it based on the below instruction. The calibration must be
operated by professionals or trained users.
For instruction of calibration, please refer to 4.2 Gas Sensibility Calibration.
Alarm Setting
This submenu is to set the alarm mode, user can set the sound, light, vibration
alarm to be on or off. The screen displays as below,

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Press “ ” or “ ” key to select the data need to modify, select
“Enable” or “Disable”, press “ ” key to confirm or press “ ” to
exit.
3.4.2 Zero Calibration
This submenu is to calibrate the zero point for the gas detector. Please refer to
instruction of 4.1 Zero Calibration.
3.4.3 Records View
Select this submenu and press “ ” key to enter, related information of
alarm records will be displayed as below,

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Remark: S1, S2, S3, S4 means the sensor channel.
Alarm 1 means grade-I
alarm. Alarm 2 means
grade-II alarm.
The number of Total means total record quantity.
The date and time in right is the date and time when this alarm occurs.
User can view all alarm records with “ ” or “ ” key.
4. Calibration
4.1 Zero Calibration
(For oxygen, it is span gas calibration with standard value of 20.9%vol in clean
air.) Zero calibration must be operated in clear air environment, preferably
once a day or calibrated after an alarm.
In the normal working mode, press “ ” key to enter main menu.
Press “ ” or “ ” key to select the submenu “Zero Calibration” and press
“ ” key to enter.
Now, the screen will display as below,

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Press “ ” or “ ” key to select the sensor need to calibrate, then, press “ ” or
“ ” key to select “Enter” to confirm the zero calibration. The zero calibration
for this sensor is finished.
Attention: If failed in zero calibration, please recalibrate in clear air. If failed
again, please contact local agent or manufacturer.
4.2 Gas Sensibility Calibration
(For oxygen, it is zero calibration with the standard value of 0.0%vol.)
For all gas sensors, the gas sensibility calibration should be operated once every
6 to 12 months at least. User should calibrate a sensor with one kind of
calibrating gas, the device will operate calibration automatically.
Below calibration tools are needed for calibration,
· Calibrating gas bottle with known concentration.

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Gas Type Recommended Gas Concentration
Methane Methane of 50%LEL
Oxygen High purity nitrogen of 99.99%
CO CO of 500ppm
H2S H2S of 50ppm
Other Gas Renegotiable
·
·
· Flow meter and pressure reducer, the recommended flow rate is 300ml / min.
· Silicone tubes for connection.
· Calibration cap and screw to fix the calibration cap
In normal working mode, press “ ” key to enter the main menu. Press
“ ” or “ ” key to select the submenu “Gas Calibration” and press
“ ” to enter. Now, the screen will display as below,

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Select the sensor need to calibrate and connect the calibration equipment and
gas detector as below,
Then, inlet the calibration gas into the gas detector and wait until the display
data becomes stable. If the displayed concentration value is not the same as the

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concentration of gas cylinder, please “ ” or “ ” key to modify the value. Then,
select “Enter” to confirm the calibration.
After calibrate all sensor channels according to above steps, the multi gas
detector calibration is completed.
Remark: To avoid error caused by mis-operation, the calibration must be
operated by professionals or trained users.
5、Ordinary Use and Maintenance
5.1 Before using the detector please read through the manual.
5.2 Only professionals or trained personnel should conduct maintenance.
5.3 Please use the device in strict accordance with this manual.
5.4 The parts must be replaced with original accessories from factory, and
serviced by professionals or trained personnel.
5.5 Please charge up the battery in safe place.
5.6 Avoid heavy vibrations or dropping from high position.
5.7 If the battery is under voltage, the device may displays abnormally,
together with discontinuous sound prompt. Please charge up the battery at
once, it will resume soon.
5.8 Do not expose the device in the operating environment of high
concentration aggressive gas for long time. In order to avoid
desensitization or even damage for the sensor.
6. Storage and Guarantee
6.1 BX615 gas detector is sold with 2 years warranty (from the day leave
factory). During this period, we will be responsible for giving free
maintain to the quality problems of breakdown under normal usage.
6.2 We disclaim all responsibility for the damage caused by misuse or trans
normal working conditions.
6.3 Attempt to disassemble the product or replace the parts without

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authorization may damage it and void your warranty. We disclaim all
responsibility for the unreliability.
6.4 Please use a moisture barrier bag when store the device in a humid
environment.
7. Standard Delivery
7.1 OC-904 gas detector
7.2 Operating manual
7.3 Battery charger
7.4 Calibration cap
7.5 Calibration cap screw
1pc
1pc
1pc
1pc
1pc
Henan Oceanus
Address: Jinjiang International Garden No.10th,
Weilai Road, Zhengzhou, China
Telephone: [phone]
Email: [e-mail]
Web: http://china-oceanus.com/