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***jradomski*** · 15th July 2007, 21:27

Quote: (Originally Posted by PaulTG2)

Hello,

I use the Apexs, but it is that easy. Hook it up and calibrate to air then then to O2. Fast, easy, accurate.

I've not had any problems with back pressure. You can test it by disconnecting the inflater hose after the cavity is flushed to see if if causes any immediate decrease in the readings.

I have also done a slight pressure test by covering up the outlet hole after it is all calibrated and watching the readings to see if they go above 1.0. I'm not certain if putting this pressure differential across the sensor is a good idea though (one side of the sensor will be at ambient and the other side higher). Not certain I could recommend it without someone more knowledgeable about the sensors said it was ok.

If I'm being picky I'll calibrate to air from a tank instead of still air to remove the humidity issue from the equation.

Sincerely,

Paul

I see no problem using it for normal calibrations as long as the gas outlet is unrestricted (not true with all analyzers, notably the alpha and OMS meters) but I wouldn't use it to check higher readings.. I dont think the sensors could handle the pressure differential.. If you really wanted to check it at higher pressures just test it using the assembled can (using the loop in and out ports) where 3-4 psi should be an issue.. The volume is fairly large s it would take a good flush to insure 100% calibration gas..

15th July 2007, 21:27	#3 (permalink)
*jradomski* Moderator Current Rebreather/s: Inspiration Classic Sport Kiss Optima rEvo Other CCR Home Build Other Rebreather/s: Inspiration Vision Evolution Megalodon Classic Kiss rEvo Other CCR Home Build Join Date: Mar 2005 Location: "Da" Bronx Posts: 2,992	Re: HammerMeg calibration Quote: (Originally Posted by PaulTG2) Hello, I use the Apexs, but it is that easy. Hook it up and calibrate to air then then to O2. Fast, easy, accurate. I've not had any problems with back pressure. You can test it by disconnecting the inflater hose after the cavity is flushed to see if if causes any immediate decrease in the readings. I have also done a slight pressure test by covering up the outlet hole after it is all calibrated and watching the readings to see if they go above 1.0. I'm not certain if putting this pressure differential across the sensor is a good idea though (one side of the sensor will be at ambient and the other side higher). Not certain I could recommend it without someone more knowledgeable about the sensors said it was ok. If I'm being picky I'll calibrate to air from a tank instead of still air to remove the humidity issue from the equation. Sincerely, Paul I see no problem using it for normal calibrations as long as the gas outlet is unrestricted (not true with all analyzers, notably the alpha and OMS meters) but I wouldn't use it to check higher readings.. I dont think the sensors could handle the pressure differential.. If you really wanted to check it at higher pressures just test it using the assembled can (using the loop in and out ports) where 3-4 psi should be an issue.. The volume is fairly large s it would take a good flush to insure 100% calibration gas.. __________________ Joe Radomski CCR Trimix Instructor Trainer ANDI Instructor Trainer Director #10 All posts are personal opinions and DO NOT reflect any affiliated agency unless specifically stated.
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