Boost gauge safety

[Aussie_Oz_Born]

G'day,

I know this an LPG page so bear with me...........I will get to the point, trust me. :)

A while ago I purchased a Redarc boost/EGT (G52-BET) gauge to keep an eye on the ol' TD5. After looking through the posts on AULRO, I decided to install the thermocouple pre-turbo (Cheers TD5 gurus!!) . At first I only connected the EGT probe to the gauge, and WOW, did not expect to be hitting 700+'C so very easily :eek: :eek: !!!.
Next up was to connect the boost pressure signal. Normally this would be a straight forward process, but considering I have an ECO SHOT LPG system installed, I was uncomfortable in having LPG lingering in a DP cell installed behind the dash, as the Redarc interface box where the multiple inputs ie: EGT, boost and optional temp. inputs connect to, is not IP rated, and therefore needs to be installed in the cabin. My solution was to de-solder the DP cell from the main PBC and have the boost pressure fed to the DP cell in the engine bay, whilst having the resultant electrical signal fed back to the PBC (in cabin) via cable. This way I was assured that no LPG could enter the cabin and cause any unwanted fires/explosions.
Did I waste my time or were my concerns warranted? Cheers guys!

[AK83]

an alternative method could have been to install the redarc control box into a sealed jiffy box, that is IP rated, in the engine bay.

[bee utey]

Even if the unit was mounted in the cab, the air/fuel mixture downstream of the Eco-shot unit will be well under its flammability point. LPG is actually quite hard to light unless within a narrow band of mixtures and a diesel gas system is extremely unlikely to reach that point during its operation. The LPG/air mixture is acting as an accelerant to the burning diesel and will not combust on its own.

[Aussie_Oz_Born]

an alternative method could have been to install the redarc control box into a sealed jiffy box, that is IP rated, in the engine bay.

That did go through my mind, however I didn't want to completely seal the unit in an air tight box as the DP cell also needs to read atmospheric pressure.

[Aussie_Oz_Born]

Even if the unit was mounted in the cab, the air/fuel mixture downstream of the Eco-shot unit will be well under its flammability point. LPG is actually quite hard to light unless within a narrow band of mixtures and a diesel gas system is extremely unlikely to reach that point during its operation. The LPG/air mixture is acting as an accelerant to the burning diesel and will not combust on its own.

Very good point, didn't think of that.