HammerMeg calibration

Paul Evans · 15th July 2007, 19:20

Antbody out there useing a ISC Cal kit with a Hammermeg?

It can't be this easy surely...........

Any body had problems with backpressure with the cal kit?

Any thoughts, experiance much appreicated

PaulTG2 · 15th July 2007, 20:09

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

***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..

Paul Evans · 16th July 2007, 12:54

I did the coarse with a Apecs2, I think whats tripping me up is the simplicity of the HH 1 point "100%" calibration........

This is what I do.

Anylise O2 bottle "Luckerly I only ever seem to get 100% from Kent Diving

it varies from 99.7 to 100.4 depending on the weather..........

Fix cal kit, flush head with 02, use anyliser to check its got to 100% in the head, remove anyliser and leave any back pressure settle for a Minute, Cal Primary and Sceondary to 100%.

DONE

MV readings taken before calibration and at calibration for the Log........

I,am not missing anything an I

heyydude · 16th July 2007, 14:07

I smell a Happy Customer...?

Kevin.

Paul Evans · 16th July 2007, 14:15

Quote: (Originally Posted by heyydude)

I smell a Happy Customer...?

Kevin.

Smug or what

Kevin, what happens if I get a lower O2 fill say 96 - 97 - 98 %

I presume I,ll need to follow's Joe's post on acurate calibration

My HH will be getting wet for the first time this weekend, sames a shame not to use it before it gets upgraded

heyydude · 16th July 2007, 14:41

Hey Paul,

Yup - that's the other 50% that I don't listen to Joe about.

We do not support allowing a diver to select lower % of O2 to Calibrate.

You can compensate in other ways, none of which will hurt you.

Joe has posted on this before, and can update it if anyone would like.

Let me know how things go.

Be Safe.

Kevin.

***jradomski*** · 16th July 2007, 15:44

Quote: (Originally Posted by heyydude)

Hey Paul,

Yup - that's the other 50% that I don't listen to Joe about.

We do not support allowing a diver to select lower % of O2 to Calibrate.

You can compensate in other ways, none of which will hurt you.

Joe has posted on this before, and can update it if anyone would like.

Let me know how things go.

Be Safe.

Kevin.

Lawyers Suck!

At least altitude cal is in there now..

***caveseeker7*** · 16th July 2007, 19:44

Quote: (Originally Posted by heyydude)

I smell a Happy Customer...?

Do all your customers smell, or just the happy ones?

15th July 2007, 19:20	#1 (permalink)
Paul Evans Freedom is the Key. Current Rebreather/s: Megalodon Other Rebreather/s: Megalodon Join Date: Oct 2006 Location: London Posts: 129	HammerMeg calibration Antbody out there useing a ISC Cal kit with a Hammermeg? It can't be this easy surely........... Any body had problems with backpressure with the cal kit? Any thoughts, experiance much appreicated __________________ "Freedom is what you do with what's been done to you." Jean-Paul Sartre "Any time anyone says, 'there is only one right way to do this' your bullshit meter should be pegged. Its a presumptive statement, made by a person who fears being proved wrong." Bill Gavin.
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15th July 2007, 20:09	#2 (permalink)
PaulTG2 Custom Title Allowed! Current Rebreather/s: Megalodon Classic Kiss Other Rebreather/s: Sport Kiss Join Date: Mar 2006 Location: Virginia, USA Posts: 323	Re: HammerMeg calibration 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
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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: 2,795	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.
(Online)

16th July 2007, 12:54	#4 (permalink)
Paul Evans Freedom is the Key. Current Rebreather/s: Megalodon Other Rebreather/s: Megalodon Join Date: Oct 2006 Location: London Posts: 129	Re: HammerMeg calibration I did the coarse with a Apecs2, I think whats tripping me up is the simplicity of the HH 1 point "100%" calibration........ This is what I do. Anylise O2 bottle "Luckerly I only ever seem to get 100% from Kent Diving it varies from 99.7 to 100.4 depending on the weather.......... Fix cal kit, flush head with 02, use anyliser to check its got to 100% in the head, remove anyliser and leave any back pressure settle for a Minute, Cal Primary and Sceondary to 100%. DONE MV readings taken before calibration and at calibration for the Log........ I,am not missing anything an I __________________ "Freedom is what you do with what's been done to you." Jean-Paul Sartre "Any time anyone says, 'there is only one right way to do this' your bullshit meter should be pegged. Its a presumptive statement, made by a person who fears being proved wrong." Bill Gavin.
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16th July 2007, 14:07	#5 (permalink)
heyydude King of the Geeks Current Rebreather/s: MK 15.X Optima Other CCR Other Rebreather/s: Other CCR Join Date: May 2005 Location: Addison, Pennsylvania Posts: 319	Re: HammerMeg calibration I smell a Happy Customer...? Kevin.
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16th July 2007, 14:15	#6 (permalink)
Paul Evans Freedom is the Key. Current Rebreather/s: Megalodon Other Rebreather/s: Megalodon Join Date: Oct 2006 Location: London Posts: 129	Re: HammerMeg calibration Quote: (Originally Posted by heyydude) I smell a Happy Customer...? Kevin. Smug or what Kevin, what happens if I get a lower O2 fill say 96 - 97 - 98 % I presume I,ll need to follow's Joe's post on acurate calibration My HH will be getting wet for the first time this weekend, sames a shame not to use it before it gets upgraded __________________ "Freedom is what you do with what's been done to you." Jean-Paul Sartre "Any time anyone says, 'there is only one right way to do this' your bullshit meter should be pegged. Its a presumptive statement, made by a person who fears being proved wrong." Bill Gavin.
(Offline)

16th July 2007, 14:41	#7 (permalink)
heyydude King of the Geeks Current Rebreather/s: MK 15.X Optima Other CCR Other Rebreather/s: Other CCR Join Date: May 2005 Location: Addison, Pennsylvania Posts: 319	Re: HammerMeg calibration Hey Paul, Yup - that's the other 50% that I don't listen to Joe about. We do not support allowing a diver to select lower % of O2 to Calibrate. You can compensate in other ways, none of which will hurt you. Joe has posted on this before, and can update it if anyone would like. Let me know how things go. Be Safe. Kevin.
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16th July 2007, 15:44	#8 (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: 2,795	Re: HammerMeg calibration Quote: (Originally Posted by heyydude) Hey Paul, Yup - that's the other 50% that I don't listen to Joe about. We do not support allowing a diver to select lower % of O2 to Calibrate. You can compensate in other ways, none of which will hurt you. Joe has posted on this before, and can update it if anyone would like. Let me know how things go. Be Safe. Kevin. Lawyers Suck! At least altitude cal is in there now.. __________________ 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.
(Online)

16th July 2007, 19:44	#9 (permalink)
*caveseeker7* Who loves ya, baby Current Rebreather/s: Sport Kiss Other Rebreather/s: Prism Topaz Join Date: Jan 2005 Location: Too far from Neverland Posts: 5,281	Re: HammerMeg calibration Quote: (Originally Posted by heyydude) I smell a Happy Customer...? Do all your customers smell, or just the happy ones? __________________ Cheers Stefan Be Water, My Friend - Bruce Lee Sponsor Lou in Race For Life!
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