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   Updated: 20 Sep 2018
 

 

 

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GASDETEKTERING - Toluen, C7H8

 

   

Toluene C7H8, formerly known as toluol, is a colorless, water-insoluble liquid with the smell associated with paint thinners.

Toluene is an aromatic hydrocarbon.

Basics on gas monotoring

Harmful Gas
Gas monitoring of combustible gases serve to obtain alarm in case of gas leakage.

Toluene is a heavy explosive gas with a flammable range from 1.2 to 7.0 vol%.

The density of the gas is 3.18. (Air = 1,0)

The detector should be mounted appr.
0.2 m above the floor.

The weight of the gas allows it to accumulate in deep points both indoors and outdoors.

Appropriate alarm levels can be determined from case to case, but outdoors, we recommend level 1 to 10% of LEL and level 2 to 20% of LEL.

Information on LEL och explosion hazard

Alarm level 1 should result in control measures while alarm level 2  should be regarded as an emergency alarm.

When forwarding alarms to local emergency services, we recommend using two detectors at alarm level 2 in order to avoid false alarms.

Alarm level 2 should result in flashlight and/or siren/gas alarm plate.

 

Flashlight should be used for alarm level 1.


 

Outdoor Gas Monitoring
Since recommendations on monitoring always depend on the circumstances in the various specific cases, one must always evaluate the effects of gas monitoring.

For detector placement consider the following:

  1. All deep areas adjacent to storage tanks, pumps, valves, vaporizers must be investigated. Monotoring should take place if accumulation risks in case of leakage are considered great.

  2. Placement of detectors at potential leak areas, like tank valves should be considered. It is important to consider the effects of weather and wind on the gasflow.

Plants have sometimes been built so that not even strong winds could have prevented a certain accumulation of flammable gas around the alarm object.

The advantage of creating a special alarm area is that alarms from the gas monitoring unit can be obtained at a very early stage.

The disadvantage of creating a special alarm area is that explosive gas concentrations can build up in here. With no special alarm area, explosive gas concentrations might not develop.

Choice of Equipment

The Stand-alone detector Combi is a detector where power supply, alarm and control functions are integrated in the detector housing. This detector is used where very simple systems are sought and only few monitoring points are desired

 

ATOL, Analog detector - Wall

 

 

 

CE

Environm.

ATOL

 

 

 

 

declaration

declaration

Datasheet

 
 

 Analog detector ATOL, Duct

 

Duct

IP

 

Calibr.

 

 

Kit

Protection Manual

Certificate

 
 


 

 


Gas alarm plate for gas detector

   

 

   

 

 

 

 

 

    Datasheet  
 


 

 

 

 

 

 

OAW 24
Combined warning horn/flashlight 
for gas detectors

         

 

 

 

 

 

    Datasheet  

 

 

 

 

 

 

 

 

OA 24
Flashlight

 

         

 

 

 

 

 

    Datasheet  

 

   

 

 

The multipoint system equipped with an instrument for gas monitoring is based on detectors providing a gas leak unit with a signal related to the gas concentration.

The signal is then processed in the gas leak unit where measurements, alarms and control functions are obtained.

The most common gas leak unit is of this type and the CGD model is used for several measuring points.

More here

Preferred system functions
Regardless of the type of gas leak unit you choose, we suggest a study of the following features:

ALarm:

Should the facility have one or two alarm levels per detector?

Control signals:

Should the facility have one relay per alarm level and sensor?
Should the relay have a function for time delay?
Should the facility have computer output?

Measurem.
values:

Should it be possible to read alarm values?
Should it be a digital, an analog or a flashing sign for gas alarm?

Diagnostics:

Should the facility itself be able to identify sensor errors, open circuits and instrument errors?

Safety:

Should the plant be equipped with a battery backup?

The exchangeable sensor X-CHANGE turns the recalibration into a home game:

  • Delivery of recalibrated sensor cartridges

  • Easy exchange, no specialized company needs to come to you

  • Available for every gas type

  • At guaranteed exchange prices

  • Increased reliability (SIL2-software)

  • Important time and cost savings

The X-Change support guarantees a price based on the consumption of the sensor capacitance.

For each uncalibrated sensor returned to AP, you will receive a credit for the unused capacity of the sensor.

More >

Legal and safety requirements
The devices are manufactured according to the regulations and various directives such as EN 50545, etc.

Products delivered by AP meet and even exceed the new European Standard EN 50545.

The safety features check the connected warning devices on functionality and open circuit day and night (Level SIL2 according to EN 50271).

 

BTOL, Field Bus detector - Wall
Modbus, BacNet, etc.
 

 

CE

to do   BTOL  

 

 

declaration

Manual

  Datasheet  

 

 

BTOL, Fieldbus detector - Duct
Modbus, BacNet, etc.
 

 

IP

Calibr.

Underst. Art &  

 

Protection

certificate

RS485 Science  
         
    Environm. Duct  
     
    declaration Kit  

 

 

Gas Leak Unit, CGD

Gas Leak Unit

 

 

 

 

 

 

 

 


Quick and easy replacement of sensor

 

   
  1. Open the housing with a screwdriver.

  2. Disconnect the sensor cable and unscrew the disused sensor head.

  3. Exchange the sensor cartridge (3) and connect the cable of the new sensor head to the PCB.

  4. Close cover of the housing with the screws (1). The recalibrated sensor is ready for use at once.

 

 

 


   

Electrical products in an explosive environment
A small amount of energy - a flame, spark, high surface temperature or similar is required to ignite an explosive gas mixture.

Products installed in an area with a potential explosion hazard must of course in themselves  not be a potential explosion hazard.

For this reason, the products are manufactured in such a way that this cannot occur.
The equipment must also be labeled and tested - ATEX classified - by the approved testing authority.


The Ex-class information is available in "Swedish Standard"
The choice of which Ex-classification is required is determined by factors such as type of gas, permissible maximum surface temperature and potential explosive hazards in the area where the products are to be installed.

The potential explosion hazard in the different areas is determined by the zone classification according to "Swedish Standard".
 



More about ATEX-products can be found in the following link



ATEX explosionproof detectors

CTOL, Combi detector - Wall
ModBus, Analog, Relay Output

 

CE

Art/Science

Underst. CTOL  

 
deklaration RS485 RS485 Datasheet  

 

 

 

 

CTOL, Combi detector  - Duct
 ModBus, Analog, Relay Output

 

Environm.

Calibr.

CE missing  

 

 

declaration

certificate

deklaration

Manual  
         
      Duct  
     

 
      Kit  

 

 

   

E-mail: ewert@automatikprodukter.se     

Phone: +46(0)31-287202

Mobile: +46(0)708885298

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