Drager OxyGauge Repair

Hodge Podge · 14th December 2007, 04:41

Got a Drager Dolphin used, but the OxyGauge did not work. Put a new O2 cell in with no results. The head was working but was alarming low PO2.

Traced the problem to corrosion in sensor P head. The Printed circuit board was not repairable. Found two SMD resistors is series with each other and parrelll to the red greed +- leads. One resistor was a 120 ohm the other measured TOAST.

With a little exterminating found a total resistance of 330 ohms gave me .17 BAR @ 5600 feet "Denver".

Installed a 330 ohm SMD across the +- O2 cell rings and re-soldered new leads.

Replaced the battery cover o-ring with an Ikelite 0126 Mini C-lite ring.
New O2 cell is a Teledyne R-15D

Cross checked with nitrox 40/60.

Good to go, I Hope or I will be dead.

Will post the pictures at OxyGauge

Stephane · 14th December 2007, 08:11

Hello,

If the Oxugauge cell is a Teledyne R-15, you'll find the data-sheet here.
According to it, the total load resistor should be 354 ohms (59µA current to give 20.9mV in air).

Hodge Podge · 21st December 2007, 05:46

Installed it today. took two 1/4 watt resistors to get 354. Not as clean as an SMD. Put heat shrink on the two resistors. Re calibrated and good to go. Thank You.

14th December 2007, 04:41	#1 (permalink)
Hodge Podge New Member Current Rebreather/s: Dolphin Other Rebreather/s: Dolphin Join Date: Oct 2007 Location: Colorado Posts: 9	Drager OxyGauge Repair Got a Drager Dolphin used, but the OxyGauge did not work. Put a new O2 cell in with no results. The head was working but was alarming low PO2. Traced the problem to corrosion in sensor P head. The Printed circuit board was not repairable. Found two SMD resistors is series with each other and parrelll to the red greed +- leads. One resistor was a 120 ohm the other measured TOAST. With a little exterminating found a total resistance of 330 ohms gave me .17 BAR @ 5600 feet "Denver". Installed a 330 ohm SMD across the +- O2 cell rings and re-soldered new leads. Replaced the battery cover o-ring with an Ikelite 0126 Mini C-lite ring. New O2 cell is a Teledyne R-15D Cross checked with nitrox 40/60. Good to go, I Hope or I will be dead. Will post the pictures at OxyGauge Last edited by Hodge Podge : 14th December 2007 at 04:56.
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14th December 2007, 08:11	#2 (permalink)
Stephane Stéphane Acounis Current Rebreather/s: rEvo Other Rebreather/s: rEvo Join Date: Nov 2005 Location: Nantes - France Posts: 788	Re: Drager OxyGauge Repair Hello, If the Oxugauge cell is a Teledyne R-15, you'll find the data-sheet here. According to it, the total load resistor should be 354 ohms (59µA current to give 20.9mV in air). __________________ Stéphane
(Online)

21st December 2007, 05:46	#3 (permalink)
Hodge Podge New Member Current Rebreather/s: Dolphin Other Rebreather/s: Dolphin Join Date: Oct 2007 Location: Colorado Posts: 9	Re: Drager OxyGauge Repair Installed it today. took two 1/4 watt resistors to get 354. Not as clean as an SMD. Put heat shrink on the two resistors. Re calibrated and good to go. Thank You.
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