• Compound single point wall mounted gas alarm

Compound single point wall mounted gas alarm

Short Description:

The products are widely used in metallurgy, chemical industry, petroleum, pharmaceutical, environmental industries work environment with toxic and harmful gas or oxygen content detection, up to four gas detection at the same time, using imported sensors, high precision, strong anti-interference ability, long service life, live shows, sound and light alarm, intelligent design, simple operation, easy calibration, zero, alarm Settings, can be output relay control signals, metal shell, strong and durable, convenient installation.

Optional RS485 output module, easy to connect with DCS and other monitoring center.

Product Detail

Product Tags

Product Parameters

● Sensor: Combustible gas is catalytic type, other gases are electrochemical, except special
● Responding time: EX≤15s; O2≤15s; CO≤15s; H2S≤25s
● Work pattern: continuous operation
● Display: LCD display
● Screen Resolition:128*64
● Alarming mode: Audible & Light
Light alarm -- High intensity strobes
Audible alarm -- above 90dB
● Output control: relay output with two way(normally open, normally closed)
● Storage: 3000 alarm records
● Digital interface: RS485 output interface Modbus RTU (optional)
● Backup power supply: provide power outage for more than 12 hours (optional)
● Working power supply: AC220V, 50Hz
● Temperature range:-20℃ ~ 50℃
● Humidity range:10 ~ 90% (RH) No condensation
● Installing mode: wall-mounted installing
● Outline dimension: 203mm×334mm×94mm
● Weight: 3800g

Technical parameters of gas-detecting
Table 1   Technical parameters of gas-detecting


Gas Name

Technical index

Measure Range


Alarm Point


Carbon monoxide





Hydrogen sulfide










Sulfur dioxide










Nitric oxide





Nitrogen dioxide




















Hydrogen chloride





Hydrogen fluoride





Ethylene Oxide








High 18%vol

Low 23%vol






Note: this instrument is for reference only.
Only specified gases can be detected. For more gas types, please call us.

Product configuration

Table 2 Product List






Wall Mounted Gas Detector




  RS485 output module




Backup battery and charging kit












Installing component



Construction and Installing

Device Installing
Installing dimension of device is shown in Figure 1.Firstly, punch at the proper height of wall, install expanding bolt, then fix it up.

Device Construction

Figure 1: Device Construction

Output wire of relay
When gas concentration exceeds the alarming threshold, the relay in the device will switch on/off, and users could connect linkage device such as fan. The reference picture is shown in Figure 2.Dry contact is used in the inside battery and device need to be connected in the outside, pay attention to the safe use of electricity and be careful of electric shock.

Wiring reference picture of relay

Figure 2: Wiring reference picture of relay 

RS485 Connection
The instrument can connect controller or DCS through the RS485 bus.
Note: RS485 output interface mode is subject to the actual.
1. Regarding the treatment method of shield layer of shielded cable, please perform single-end connection. It is recommended that the shield layer at one end of the controller be connected to the shell to avoid interference.
2. If the device is far away, or if multiple devices are connected to the 485 bus at the same time, it is recommended to install a 120-euro terminal resistor on the terminal device.

Operating instructions

The instrument has 6 buttons, an LCD screen, related alarm devices (alarm lights, buzzer) can be calibrated, set alarm parameters and read alarm records. The instrument itself has a storage function, which can record the alarm status and time in real time. For specific operations and functions, please see the description below.

Instrument working instruction
After the instrument is powered on, enter the boot display interface, displaying the product name and version number. As shown in Figure 3:

Boot display interface

Figure 3: Boot display interface

Then show the initialization interface, as shown in figure 4:

initialization interface

Figure 4: initialization interface

The function of initialization is to wait for the instrument parameters to stabilize and warm up the sensor. X% is the currently running progress.

After the sensor warms up, the instrument enters the gas detection display interface. The values of multiple gases are displayed cyclically, as shown in Figure 5:

Concentration display interface

Figure 5: Concentration display interface

The first line displays the detected gas name, the concentration value is in the middle, unit is on the right, and the year, date, and time are displayed cyclically below.
When any gas alarm occurs, the upper right corner displaysdisplay, the buzzer sounds, the alarm light flashes, and the relay acts according to the setting; if the mute button is pressed, the icon changes asdisplay, the buzzer mute; no alarm, icon is not displayed.
Every half hour, store the current concentration of all gases. The alarm status changes and is recorded once, for example from normal to first level, first level to second level or second level to normal. If it keeps alarming, it will not be stored.

Button function
Button functions are shown in table 3:
Table 3 Button function

Button Function
5.2.Button function2 l Press this button to enter the menu in the real-time display interface
l Enter sub-menu
l Determine the setting value
5.2.Button function1 l Silence, press this button to silence when an alarm occurs
l Return to previous menu
5.2.Button function4 l Select menu
l Change the setting value
5.2.Button function Select menu
Change the setting value
5.2.Button function3 Select setting value column
Decrease setting value
Change the setting value
5.2.Button function5 Select setting value column
Increase the setting value
Change the setting value

View parameter
If there is a need to view gas parameters and store recorded data, in the real-time concentration display interface, you can press any button in the up, down, left, right, to enter the parameter view interface.

Example, press button Example, press button to check show in figure 6 to check show in figure 6

Gas parameter

Figure 6: Gas parameter

Press button Example, press button to check show in figure 6 to show other gas parameters, after all gas parameters are displayed, press button Example, press button to check show in figure 6 to enter the storage state view interface as shown in figure 7

Storage state

Figure 7: Storage state

Total storage: the total number of records currently stored.
Overwrite times: when the memory of the written record is full, the store is over written from the first, and the overwrite times are increased by 1.
Current sequence number: the physical sequence number of the storage.

Press button Example, press button to check show in figure 6 to enter the specific alarm record as shown in figure 8, press buttonbutton return to the detection display screen.
Press button button1orExample, press button to check show in figure 6 to enter next page, alarm records are shown in figure 8 and figure 9.

Boot record

Figure 8: Boot record

Show from the last record

Press button button3 or button2 to previous page, press button button exit to the detection display screen

Alarm records

Figure 9: Alarm records

Note: If does not press any button during 15s when viewing the parameters, the instrument will automatically return to the detection display interface。

If you need to clear the alarm records, enter the menu parameter settings-> device calibration password input interface, enter 201205 and press OK, all alarm records will be cleared.

Menu operation instructions
On the real-time concentration display interface, press button button5to enter the menu. The main interface of the menu is shown in Figure 10. Press button button3 or  Example, press button to check show in figure 6 to select the function and press buttonbutton5 to enter the function.

Main menu

Figure 10: Main menu

Function description
● Set Para: time setting, alarm value setting, instrument calibration and switch mode.
● Communication setting: communication parameter setting.
● About: device version information.
● Back: return to the gas detection interface.
The number on the upper right is the countdown time. If there is no button operation during 15 seconds, the countdown will exit to the concentration value display interface.

If you want to set some parameters or calibration, please select "parameter setting" and press button button5 to enter the function, as shown in figure 11:

System Setting Menu

Figure 11: System Setting Menu

Function description
● Time setting: set the current time, you can set the year, month, day, hour, minute
● Alarm setting: set the device alarm value, the first level (lower limit) alarm value and the second level (upper limit) alarm value
● Calibration: zero point calibration and instrument calibration (please operate with standard gas)
● Switch mode: set relay output mode

Time setting
Select "Time Setting" and press button button5enter. Figures 12 and 13 show the time setting menu.

Time setting menu I

Figure 12: Time setting menu I

ime setting menu II

Figure 13: Time setting menu II

The icon button001 refers to the currently selected time to be adjusted. Press button button1orbutton2 to change the data. After selecting the desired data, press button button3orbutton3 to select other time functions.
Function description
● Year: the setting range is 20 ~ 30.
● Month : the setting range is 01 ~ 12.
● Day: the setting range is 01 ~ 31.
● Hour: the setting range is 00 ~ 23.
● Minute: the setting range is 00 ~ 59.
Press button button5to confirm the setting data, press buttonbutton to cancel the operation and return to the previous level.

Alarm setting
Select "Alarm setting", Press button to enter and select the gas which needs to be setting, show as figure 14.

Gas selection interface

Figure14: Gas selection interface

Example, select CH4, press button button5 to show the parameters of CH4, show as figure 15.

Carbon monoxide alarm setting

Figure 15: Carbon monoxide alarm setting

Select "the first level alarm", press buttonbutton5 to enter the setting menu, show as figure 16.

The first level alarm setting

Figure 16: The first level alarm setting

At this time, press buttonbutton1 orbutton2  to switch the data bit, press buttonbutton3 or Example, press button to check show in figure 6 to increase or decrease the value, after setting, press button button5to enter the alarm value confirmation value interface, press buttonbutton5 to confirm, after the setting is successful, the bottom shows "success", otherwise it prompts "failure", as shown in Figure 17 Show.

Setting success interface

Figure 17: Setting success interface

Note: The set alarm value must be less than the factory value (the oxygen lower limit alarm must be greater than the factory setting value) otherwise it will fail to set.

After the first level setting is completed, press buttonbutton5 to the alarm value setting selection interface as shown in Figure 15. The operation method for setting the second level alarm is the same as above. After the setting is completed, press the return button to return to the gas type selection interface, you can select the gas to set, if you do not need to set other gases, press buttonbutton5 until return to the real-time concentration display interface.

Equipment calibration
Note: powered on, zero calibration and gas calibration can be performed after initialization, and zero calibration must be performed before calibration
Parameter Settings - > calibration equipment, enter the password: 111111

Input password menu

Figure 18: Input password menu

Press button5and Correct password into the calibration interface as figure 19.

Calibration option

Figure 19: Calibration option

Select calibration type and press button5 enter to gas type selection, select the calibrated gas, as figure 20, press button5enter to calibration interface.

Select gas type interface

Select gas type interface

Take CO gas as an example below:
Zero calibration
Pass into the standard gas(No oxygen), choose 'Zero Cal' function, then press button5 into the zero calibration interface. After determining the current gas after 0 ppm, press button5to confirm, below middle will display 'Good' vice display 'Fail'. As shown in figure 21.

Select zero

Figure 21: Select zero

After the completion of the zero calibration, press buttonback to the calibration interface. At this time, gas calibration can be chosen, or return to the test gas interface level by level, or in a countdown interface, without pressing any buttons and time reduces to 0,it automatically exit menu to return to the gas detection interface. 

Gas calibration
If gas calibration is needed, this needs to operate under the environment of a standard gas.
Pass into the standard gas, choose 'Full Cal' function, pressbutton5 to enter the gas density Settings interface, through button1or button2 button3or Example, press button to check show in figure 6 set the density of the gas, assuming that the calibration is methane gas, the gas density is 60, at this time, please set to' 0060 '. As shown in figure 22.

Set the standard of gas density

Figure 22: Set the standard of gas density

After setting the standard gas density, pressbutton5 into the calibration gas interface, as shown in figure 23:

Gas calibration

Figure 23: Gas calibration

Display the current detecting gas concentration values, pass into standard gas. As the countdown gets to 10S, press button5to calibrate manually. Or after 10s, gas automatically calibrated. After a successful interface, it displays 'Good 'or display 'Fail '.As figure 24.

Calibration result

Figure 24: Calibration result

Relay Set:
Relay output mode, type can be selected for always or pulse, just as what shows in Figure 25:
Always: when alarming occurs, relay will keep actuating.
Pulse: when alarming occurs, relay will actuate and after the Pulse time, the relay will be disconnected.
Set according to the connected equipment.

Switch mode selection

Figure 25: Switch mode selection

Communication settings
Set relevant parameters as figure 26.

Addr: address of slave devices, range: 1-99
Type: read only, non-standard or Modbus RTU, the agreement cannot be set.
If RS485 is not equipped, this setting will not work.

Communication settings

Figure 26: Communication settings

Version information of display device is shown in Figure 27

Version Information

Figure 27: Version Information

Common malfunctions and solutions

Table 4 Common malfunctions and solutions




After turning on the power supply gas sensor cannot connected Connection failure between sensor board and host Open the panel to check whether it connected well.
Alarm value setting failed Alarm value set must be less than or equal to factory value, except for oxygen Check whether the alarm value is greater than the factory setting value.
Zero correction failure Current concentrations is too high ,is not allowed It can be operated with pure nitrogen or in clean air.
No change when input standard gas Sensor expiration Contact after sell service
Oxygen gas detector but display 0%VOL Sensor failure or expiration Contact after sell service
For Ethylene oxide, hydrogen chloride detector, it has been display full range after the boot For such sensors to warm up it needs powered off  and recharged,after 8-12 hours warm up it will works normally Wait until the sensors warm up finished

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