Because of SF6 gas is heavier than air, the SF6 gas leaked so will gather together when quilt the minimum place of monitoring room. SF6 of low-lying place report to the police density sets is in 2. 0% signifies: With quilt the total air quantity in monitoring room compares , the leakage rate of SF6 gas is still nearly 0%. Therefore under the most conditions, even if having sent out to report to the police , still returning some enough headroom to survey and eliminate leak source.
Since warning decice will be worked for a long period continuously, its reliability is very important , is so this to install the various functions that may inspect self need not repair regularly just. 
Function introduction
The air in room is then taken out first through a dust-clearing filter by a little membrane type pump in test cavity. This installation determines the content of SF6 through measuring the velocity of sound of gas mixture sucked in by this pump. This measured value compares via tiny processor and the data stocked in advance , reach the content of SF6 in air comparatively soon afterwards. If the content measured is larger than 2. 0%( concentration percentage by volume than), processor sends alarm signal, red give out light diode sends smooth signal, buzzer produces sound signal, and the signal of remote control will be suspended the constant signal on control socket.
Tiny processor returns can monitoring the other function of this installation, such as the operation of air current and membrane type pump, voltage, temperature and the function of installation. If appearance fault, will show discrepant frequently, red give out light the signal lamp of 'disturb' of diode lights , buzzer is light and loud , at the same time, the another constant signal on far end control socket is suspended.
Through using end control socket, all functions of this installation may remotely control.
Standard disposition may carry out monitoring through 1 monitoring points, may also select to control case carry out monitoring warning decice for 3 monitoring points can can expand 6 monitoring points at most to carry out monitoring. 
Technical parameter
Voltage - 240 V/50Hz of 220 V
Consume can ask 40VA
Respond time to use the long connection of 2 m flaxible tube is approximately 1 minutes
Contact exports 2 2s. 5A has no to press conversion contact 250 V AC
Working temperature -5 ¡æ to +40 ¡æ( working state)( +32 ¨H to+104 ¨H)
-25 ¡æ to +60 ¡æ( the state stored )( -13 ¨H to+140 ¨H)
Protective grade basis IP40 of DIN400500
Report to the police to set the concentration percentage by volume of the air of SF6/ than is 2. 0%
Precision ±0. 5Vol. The composition of %SF6