• Single-point Wall-mounted Gas Alarm (Carbon dioxide)

Single-point Wall-mounted Gas Alarm (Carbon dioxide)

Short Description:

Single-point wall-mounted gas alarm is designed aimed at gas detecting and alarming under the various non-explosion-proof conditions. The equipment adopts imported electrochemical sensor, which is more accurate and stable. Meanwhile, it is also equipped with 4 ~ 20mA current signal output module and RS485-bus output module, to internet with DCS, control cabinet Monitoring Center. In addition, this instrument can also be equipped with large-capacity back-up battery (alternative), completed protection circuits, to ensure that the battery has a better operating cycle. When powered off, a back-up battery can provide 12 hours of life time of equipment.

Product Detail

Product Tags

Technical parameter

● Sensor: infrared sensor
● Responding time: ≤40s (conventional type)
● Work pattern: continuous operation, high and low alarm point(could be set)
● Analog interface: 4-20mA signal output [option]
● Digital interface: RS485-bus interface [option]
● Display mode: Graphic LCD
● Alarming mode: Audible alarm -- above 90dB; Light alarm -- High intensity strobes
● Output control: relay output with two way alarming control
● Additional function: time display, calendar display
● Storage: 3000 alarm records
● Working power supply: AC195~240V, 50/60Hz
● Power consumption: <10W
● Temperature range:-20℃ ~ 50℃
● Humidity range:10 ~ 90%(RH)No condensation
● Installing mode: wall-mounted installing
● Outline dimension: 289mm×203mm×94mm
● Weight: 3800g

Technical parameters of gas-detecting

Table 1: Technical parameters of gas-detecting

Measured Gas

Gas Name

Technical standards

Measuring Range


Alarming point


Carbon dioxide





ALA1   Low alarm
ALA2   High alarm
Prev   Previous
Set Para   Parameter settings
Com Set   Communication settings
Num   Number
Cal   Calibration
Addr   Address
Ver   Version
Min   Minutes

Product configuration

1. Wall-mounted detecting alarm    one
2. 4-20mA output module    (option)
3. RS485 output    (option)
4. Certificate    one
5. Manual    one
6. Installing component    one

Construction and installing

6.1 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.

Figure 1 installing dimension

Figure 1: installing dimension

6.2 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.

Figure 2 wiring reference picture of relay

Figure 2: wiring reference picture of relay

Provides two relay outputs, one is normally open and another is normally closed. Figure 2 is a schematic view of the normally open.
6.3 4-20mA output wiring  [option]
Wall-mounted gas detector and control cabinet (or DCS) connect via 4-20mA Current signal. The interface shown in Figure 4:

Figure3 Aviation plug

Figure3: Aviation plug   

The 4-20mA wiring corresponding shown in Table2:
Table 2: 4-20mA wiring corresponding table




4-20mA signal output







The 4-20mA connection diagram shown in Figure 4:

Figure 4 4-20mA connection diagram

Figure 4: 4-20mA connection diagram

The flow path of connecting leads is as follows:
1. Pull the aviation plug off the shell, unscrew the screw, get out the inner core marked "1, 2, 3, 4".
2. Put 2-core shielding cable through the outer skin, then according to Table 2 terminal definition welding wire and conductive terminals.
3. Install the components to the original place, tighten all the screws.
4. Put the plug in the socket, and then tighten it.
As to the processing method of shielding layer of cable, please execute a single end connection, connect shielding layer of controller end with the shell In order to avoid interference.
6.4 RS485 connecting leads [option]
The instrument can connect controller or DCS through the RS485 bus. Connection method similar 4-20mA, please refer 4-20mA wiring diagram.

Operation instruction

The instrument has 6 buttons, a liquid crystal display, alarm device (alarm lamp, a buzzer) could be calibrated, set the alarm parameters and read alarm record. The instrument has memory function, and it can record the state and time alarm timely. The specific operation and functional are shown below.

7.1 Equipment description
When the device is powered on, it will enter the display interface. The process is shown in Figure 5.

Figure 5 Boot display interface
Figure 5 Boot display interface1

Figure 5: Boot display interface

The function of device initialization is that when the parameter of device is stable, it will preheat the sensor of instrument. X% is currently running time, the running time will vary according to the type of sensors.
As what shows in Figure 6:

Figure 6 Display interface

Figure 6: Display interface

The first line shows the detecting name, the concentration values is shown in the middle, the unit is shown on the right, year ,date and time will be shown circularly.
When alarming occurs, v will be shown on the upper right corner, the buzzer will buzz, the alarm will twinkle, and relay respond according to the settings; If you press the mute button, the icon will becomeqq , the buzzer will be silent, no alarm icon is not displayed.
Every half an hour, it saves the current concentration values. When the state of alarm changes, it records it. For example, it changes from normal to level one, from level one to level two or level two to normal. If it keeps alarming, recording will not be occurred.

7.2 Function of buttons
Button functions are shown in Table 3.
Table 3: Function of buttons



button5 Display the interface timely and Press the button in the menu
Enter the child menu
Determine the set value
button Mute
Back to the former menu
button3 Selection menuChange the parameters
Example, press button to check show in figure 6 Selection menu
Change the parameters
button1 Select the setting value column
Decrease the setting value
Change the setting value.
button2 Select the setting value column
Change the setting value.
Increase the setting value

7.3 Check parameters
If there is a need to see the gas parameters and recording data, you could anyone of the four arrow buttons to enter the parameter-checking interface on the concentration display interface.
For example, pressExample, press button to check show in figure 6 to see the interface below. As shows in Figure 7:

Gas parameters

Figure 7: Gas parameters

PressExample, press button to check show in figure 6 to enter the memory interface (Figure 8), press Example, press button to check show in figure 6to enter specific alarming recording interface (Figure 9), press buttonback to detecting display interface.

Figure 8 memory state

Figure 8: memory state

Save Num: The total number of records for the storage.
Fold Num:  When the written record is full, it will start from the first cover storage, and coverage counts will add 1.
Now Num: The index of Currently storage
Pressbutton1 or Example, press button to check show in figure 6 to the next page, alarming records are in the Figure 9

Figure 9 boot record

Figure 9: boot record

Display from the last records.

alarm record

Figure 10: alarm record

Press button3 or button2 to the next page, press button back to the detecting display interface.

Notes: when checking parameters, not pressing any keys for 15s, the instrument will automatically return to the detection and display interface.

7.4 Menu operation

When in the real-time concentration display interface, pressbutton5 to enter the menu. The menu interface are shown in Figure 11, pressbutton3 or Example, press button to check show in figure 6to choose any function interface, press button5 to enter this function interface.

Figure 11 Main menu

Figure 11: Main menu

Function description:
Set Para: Time settings, alarm value settings, device calibration and switch mode.
Com Set: Communication parameters settings.
About: The version of device.
Back: Back to the gas-detecting interface.
The number on the upper right is the countdown time, when there is no key operation 15 seconds later, will exit the menu.

Figure 12 System setting menu

Figure 12: System setting menu

Function description:
Set Time: Time settings, including year, month, day, hours and minutes
Set Alarm: Set alarm value
Device Cal: Device calibration, including zero point correction, correction of calibration gas
Set Relay: Set relay output

7.4.1 Set Time
Select "Set Time", press button5 to enter. As Figure 13 shows:

Figure 13 Time setting menu
Figure 13 Time setting menu1

Figure 13: Time setting menu

Icon aais referring to the currently selected to adjust the time, pressbutton1 or button2to change data. After selecting data, press button3orExample, press button to check show in figure 6to choose to regulate other time functions.
Function description:
● Year set range 18 ~ 28
● Month set range 1~12
● Day set range 1~31
● Hour set range 00~23
● Minute set range 00 ~ 59.
Press button5to determine the setting data, Press buttonto cancel, back to former level.

7.4.2 Set Alarm

Select "Set Alarm", press button5to enter. The following combustible gas devices to be an example. As shown in figure 14:

Combustible gas alarm value

Figure 14: Combustible gas alarm value

Choose Low alarm value is set, and then press button5to enter the Settings menu.

Set the alarm value

Figure 15: Set the alarm value

As shown in figure 15, press button1orbutton2to Switch data bits, press button3orExample, press button to check show in figure 6to increase or decrease data.

After the completion of the set, pressbutton5, confirm numerical interface into the alarm value, press button5 to confirm, after the success of the Settings below 'success', whereas tip 'failure', as shown in figure 16.

Settings success interface

Figure 16: Settings success interface

Note: set the alarm value must be smaller than the factory values (oxygen lower limit alarm value must be greater than the factory setting); otherwise, it will be set a failure.
After level set is finished, it returns to the alarm value set type selection interface as shown in figure 14, the secondary alarm operation method is same as above.

7.4.3 Equipment calibration
Note: powered on, initialize the rear end of zero calibration, calibration gas, correction must be corrected when zero air calibration again.
Parameter Settings - > calibration equipment, enter the password: 111111

Figure 17 Input password menu

Figure 17: Input password menu

Correct password into the calibration interface.

Calibration option

Figure 18: Calibration option

● Zero in Fresh Air (assumed to be 450ppm)
In the fresh air, assumed to be 450ppm, choose 'Zero Air' function, then press button5  into the Zero in Fresh Air interface. Determining the current gas 450ppm, press button5  to confirm, below middle will display 'Good' vice display 'Fail' .As shown in figure 19.

Select zero

Figure 19: Select zero

After the completion of the Zero in Fresh Air, press buttonback to return. 

● Zero in N2
If gas calibration is needed, this needs to operate under the environment of a standard gas.
Pass into the N2 gas, choose 'Zero N2' function, press button5  to enter. As shown in figure 20.

Confirmation interface

Figure 20: Confirmation interface

Pressbutton5, into the calibration gas interface, as shown in figure 21:

Figure 21Gas calibration

Figure 21: Gas calibration

Display the current detecting gas concentration values, pipe in standard gas. As the countdown gets to 10, press button5 to calibrate manually. Or after 10s, gas automatically calibrates. After a successful interface, it displays 'Good 'and vice, display 'Fail '.

● Relay Set:
Relay output mode, type can be selected for always or pulse, just as what shows in Figure22:
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.

Figure 22 Switch mode selection

Figure 22: Switch mode selection

Note: The default setting is Always mode output
7.4.4 Communication settings:
Set relevant parameters about RS485

Figure 23 Communication settings

Figure 23: Communication settings

Addr: address of slave devices, range: 1-255
Type: read only, Custom (non-standard) and Modbus RTU, the agreement can not be set.
If RS485 is not equipped, this setting will not work.
7.4.5 About
Version information of display device is shown in Figure 24

Figure 24 Version Information

Figure 24: Version Information

Warranty Description

The warranty period of the gas detection instrument produced by my company is 12 months and warranty period is valid from the date of delivery. Users shall comply with the instructions. Due to the improper use, or poor working conditions, the instrument damage caused is not in the scope of the warranty. 

Important Tips

1. Before using the instrument, please read the instructions carefully.
2. The use of the instrument must be in accordance with the rules set in the manual operation.
3. The instrument maintenance and replacement of parts should be processed by our company or around the pit.
4. If the user is not in accordance with the above instructions to boot repair or replacement parts, the reliability of the instrument shall be the responsibility of the operator.
5. The use of the instrument should also abide by the relevant domestic departments and factory equipment management laws and rules.

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