Bosean Electronic Technology BH-90a User manual

BH-90a
Portable Single gas Detector
User Manual
Ver：BSA20150424005
Bosean Electronic Technology Co.,Ltd
ISO9001-2008

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To avoid personal safety injury, Instrument damage and potential dangerous accident;
do not use the product before reading this manual.
1. Description
BH-90a portable single gas detector can make continuous
detection to combustible and toxic gases. It is suitable for
combustible and toxic gas leakage detection in
underground pipe or mines, and keeps the workers safe,
prevents the facilities from being destroyed.
The detector, adopting excellent-quality sensor, makes
detection in the way of natural diffusion. It has good
sensitivity and reproducibility. The detector adopts
embedded MCU controller, easy to operate.
The shell adopts special high strength material and
anti-smooth rubber, with the characters of water-proof and dust-proof.
2. Features and specifications
2.1 Features
Advanced MCU control with low power consumption;
Adjustable low and high alarm level;
Adjustable calibrating level;
High concentration protection for combustible gas;
Self test for the combustible gas sensor;
Low battery indication;
Self-adjustment function
Visual and audible alarm with vibration;
Advanced self-examination and self-renovation function
Password management to avoid wrong operation;
Explosive proof housing
2.2 Specifications
Range: See attached table 1.
Gas Detected: combustible gas (CH4,C3H8,H2) and toxic gas, oxygen, Other rare
toxic gas like ammonia, NO, PH3, NH3, NO2, HCN, SO2etc also available,Can be
specified by the Customer in advance.

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Alarm set points: see attached table 1.
Accuracy: ≤±5% F.S. Response time: T<30s
Indication: LCD indicates the time and state
Indication of alarm, fault and low voltage with LED, sound, vibration
Operating Environment:
Operating temperature -40℃～70℃(for combustible gas)
Operating temperature: -10℃～55℃(for toxic gas)
Humidity: <95%RH non-condensing
Operating voltage: DC3.7V Li battery 1500mAh
Working time: < 8h continuously
Charging time: 4h～6h
Sensor life: 2 years
Protection category: IP65
Weight: about 130g (including battery but without accessories)
Dimension: 109mm×60mm×30mm
3. Structure & Function
3.1 Appearance
1
Alarm light
5
Buzzer
2
Buttons
6
USB charging connection
3
LCD screen
7
Sensor
4
Back clip
3.2 Detector structure: the main shell, circuit boards, batteries, display, sensors,
chargers of the components.
3.3 Principle: Electrochemical or Catalytic sensor or others.

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4. Operation & Function
4.1 Display Elements
CO
Gas type
10:45
Time
Full voltage
ppm
Concentration value
25.5 ℃
Temperature
4.2 Push buttons
Push button
Description
To active the detector, press and hold it for 5 seconds
Press it to cancel the the operation;
To deactive the detector, press and hold it for 5 seconds
Press it to set up the parameters
▼▲
Can check parameters, alarm record, low alarm, high alarm, zero
calibration, calibration,time set.
4.3 Turn on
Press the button for 5s and then release it. The interface shows “Starting”, “LED
Testing”, and then vibrates with “Motor Testing”, then beep and flashes with “Sound and
Alarm Testing”, shows low alarm value, high alarm value, detecting range, it enters into
detecting status.
At this time, it displays the concentration of gas in the environment as figure 1.
Fig 1
CO
0ppm
25.5 ℃10:45
CO
0ppm
25.5 ℃10:45

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4.4 Turn off
To deactivate the detector, press key, then it displays the following information:
At this time, the buzzer gives beep sound. After 3 seconds, when it displays the
following figure on the screen, loosen the key. The detector is turned off.
Attentions：When the detector is not detecting status, press continuously till it
returns to the detection mode.
4.5 Menu Operating Instructions
The user menu contains the following options:
Zero calibration, calibration, time set, alarm record, low alarm settings, high alarm
settings, unit set.
In the detection state, press key, the screen displays the following screen, directly
into user menu as shown in figure 4:
Fig. 4
MENU
→ Gas Zero
Gas Calib
Set time
Record
LA Set
HA Set
Unit set
ESC
Turn off

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Parameter setting of the detector
Display
Description
Fig 5
Fig 6
Fig 7
Fig 8
1. Zero function setting
Press the button in the menu interface, the
interface shown as Figure 14: press key to enter
into the zero setting page as Figure 5: press the
button ▲for zero drift, as shown in Figure 6: the
instrument directly into the menu settings page, press
the button to save the drift value, interface as
shown in Figure 7: the instrument directly into the
menu screen, press the button again, the
instrument enters the normal detection interface.
Warning: this operation is to ensure that the operation
is carried out in clean air, otherwise the concentration
of the reaction gas in the environment will affect the
accuracy of the portable gas detector.
Fig 9
Fig10
2. Calibration settings function
Press the button in the menu interface, move
the cursor with▼key, the interface shown as Figure
9: press enter into the calibration setting page as
Figure 10: press ▲to choose number, press ▼to
adjust the number, input password 8888 and press
the button into calibration interface.
Input the standard calibration gas value in the
calibration interface as Figure 11, for example, CO, it
s 500ppm on the gas cylinder, input 500, and press
“Next” into gas entry interface as Figure 12.
Please inject standard calibration gas, once the

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Fig11
Fig12
value is stable after 2 minutes, press “SAVE”
calibration is done. The rate of flow 500ml/min is
recommended.
Fig13
Fig14
Fig15
3. Time setting
Press the button in the menu interface, move
the cursor with▼key, choose the set time, the year
interface shown as Figure 13: press → to move the *,
press ▲to adjust number, press Next to confirm.
After set year, press next, you can set month, date,
hour, minute, Press “SAVE” to complete the time set.
Fig16
4. Alarm Record
Enter alarm record interface, display date and
max alarm value, it save the max alarm value every 3
minutes as shown Figure 16, “11.29.12.36” means
29th November 12:36, “65” display the max alarm
value within 3 minutes. Press “ESC” return main
interface, Press ▼to delete the record as shown
Figure 17.

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Fig17
Fig18
5. Low alarm setting
Enter “LA set” menu, use ▲to adjust the cursor, use
▼to adjust the value, choose the right value and
press “SAVE”. then it will return the normal detecting
interface show as Figure 18. If no special
requirement, please do not revised alarm value.
6. High alarm setting
The setting is same as low alarm setting. Note: High
alarm value never lower than low alarm value. If no
special requirement, please do not revised alarm
value.
Fig19
7. Unit set
Enter “Unit set” function show as Figure 19, choose
the suitable unit and save it. Note, this function can
be used on the PPM unit gas.
Fig20
8. ESC
Under the menu function interface, choose ESC,
press to return normal detecting interface.
Fig21
9. Turn off
Under the menu function interface, choose “Turn off”,
press ▲to turn off, press ▼to return normal
detecting interface.
4.6 Alarm information
The following table shows the details of each alarm:

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Alarm type
Low alarm:
Short slow alarm tone;
The alarm indication is yellow;
The red alarm light flashes;
Device vibrates .
High alarm:
Abnormal harsh alarm tone;
The alarm indication is red;
The red alarm light flashes;
Device vibrates.
Low battery alarm:
When the device is in low battery, it will give slow short
alarm every minute to remind user.
4.7. Charging
Please charge the detector when it shows low battery or the detector can’t be turned on
due to low battery. Before charging, please turn off the detector to avoid any potential
damage. When the battery mark on the screen is full and doesn’t change any more, it
means the charging is completed, you can pull off the charger.
Warning: During charging status, the detector can’t detect the gas leakage. Please do
not try to charge it at testing places to avoid fire or explosion. Please do not charge it
when the detector is working to avoid potential damage.
Note: Make sure full charge for at least once within 1 months
If do not use it for a long time.
5. Possible fault and corresponding solution
Possible fault
Possible reason
Corresponding solution
No response to alarm
Wrong alarm point
Please reset the alarm point
Fault of electric circuit
Please contact the manufacturer

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No response to gas
detected
Zero drift
Calibrate zero point
Fault of electric circuit
Please contact the manufacturer
Inaccurate indication
Sensor is overdue
Please contact manufacturer to
replace gas senor
Uncalibrated for long time
Please calibrate it in time
Insufficient working
hours
Fault of Charger
Please change charger
Fault of the Device
Please contact the manufacturer
Can not charge
electricity
Fault of Charger
Please change charger
Fault of the Device
Please contact the manufacturer
6. Notices
6.1 Falling down from high places or strong shake is prohibited.
6.2 The detector may not work properly at interferential high-concentration gas.
6.3 To avoid incorrect result or possible damage to the detector, please operate and
handle the detector in accordance with the manual.
6.4 The detector should be not stored or used neither under the circumstance with
caustic gas (such as Cl2), nor under the other rugged circumstances, including
excessive high or low temperature, high humidity, electromagnetic field and strong
sunshine.
6.5 If there is dust on the surface of the detector after a long-term use, please clean it
lightly with clean soft cloth. The surface may be scraped or destroyed with caustic
solvent or hard things.
6.6 To assure the testing accuracy, the detector should be calibrated periodically. And
the calibration period should be less than one year.
6.7 Please put the used Lithium batteries to the appointed places or send to our
company. Don’t discard them into the dustbin randomly.
7. Standard accessories:
Gas detector 1pc
Calibration cap 1pc
Charger 1pc
User manual 1pc
Suit case packaging 1pc
Warranty card 1pc
Quality card 1pc

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Affix. Table1
Model
Range
L-alarm
H-alarm
□BH-90A-CH4
0-100%LEL
20%LEL
50%LEL
□BH-90A-C3H8
0-100%LEL
20%LEL
50%LEL
□BH-90A-H2
0-100%LEL
20%LEL
50%LEL
□BH-90A-H2
0-1000ppm
35ppm
250 ppm
□BH-90A-H2S
0-100ppm
10ppm
15ppm
□BH-90A-H2S
0-100ppm
10ppm
20ppm
□BH-90A-CO
0-1000ppm
35ppm
200ppm
□BH-90A-CO
0-1000ppm
30ppm
60ppm
□BH-90A-C2H4O
0-20ppm
10ppm
15ppm
□BH-90A-C2H4
0-100%LEL
20%LEL
50%LEL
□BH-90A-C2H4
0-20ppm
5ppm
10ppm
□BH-90A-O2
0-30%vol
19.5%vol
23.5%vol
□BH-90A-C2H5OH
0-100%LEL
20%LEL
50%LEL
□BH-90A-NH3
0-100ppm
25ppm
50ppm
□BH-90A-CL2
0-20ppm
5ppm
10ppm
□BH-90A-O3
0-20ppm
5ppm
10ppm
□BH-90A-O3
0-10ppm
2ppm
5ppm
□BH-90A-O3
0-50ppm
5ppm
10ppm
□BH-90A-SO2
0-20ppm
2ppm
5ppm
□BH-90A-SO2
0-100ppm
2ppm
5ppm
□BH-90A-PH3
0-20ppm
0.3ppm
5ppm
□BH-90A-PH3
0-5ppm
0.3ppm
2ppm
□BH-90A-CO2
0-5000ppm
1000ppm
2000ppm
□BH-90A-CO2
0-50000ppm
1000ppm
2000ppm
□BH-90A-NO
0-250ppm
20ppm
50ppm
□BH-90A-NO2
0-20ppm
5ppm
10ppm
□BH-90A-HCN
0-500ppm
10ppm
20ppm
□BH-90A-HCN
0-50ppm
10ppm
20ppm
□BH-90A-HCL
0-50ppm
10ppm
20ppm
□BH-90A-CH2O
0-10ppm
2ppm
5ppm
□BH-90A-VOC
0-100ppm
20ppm
50ppm
□BH-90A-VOC
0-1000ppm
50ppm
200ppm
□BH-90A-C6H6
0-100ppm
20ppm
50ppm

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Declaration
To keep continued product improvement, Bosean reserves the right to change design
features without prior notice
Henan Bosean Electronic Technology Co.,Ltd.
No.228,West 4th Ring,National High-Tech zone,Zhengzhou,China
Tel: [phone]
Fax: [phone]
Website: www.bosean.com