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Originally Posted by slctech

CNG compressors, I have been servicing and maintaining numerous CNG compression equipment for years. From residential FuelMaker systems to Gas Station rack systems.....3000psi plus...so this could count as my 1%

that would do it.

Originally Posted by jayguy

what are you working on 1% of the time where the pressure is over 800 psig?

CNG compressors, I have been servicing and maintaining numerous CNG compression equipment for years. From residential FuelMaker systems to Gas Station rack systems.....3000psi plus...so this could count as my 1%

Originally Posted by slctech

...Gauge does upto 800psi so covers the spectrum of 99% of what I would attach it to...

what are you working on 1% of the time where the pressure is over 800 psig?

Originally Posted by slctech

You know I started with these, but there are so many times I couldn't connect to a system for what ever reason because of the stubby solid connection, that is why I dumped the fitting and added a the hose instead.

I gotcha. I'm using them on flexible service valves for refrigeration so I'm able to bend them a little as necessary.

Originally Posted by gravity

I use my digicool ak900. have hoses with ball valves. after i take my readings i close the ball valves, remove both hoses from ports and hook liquid line hose to suction valve and suck it back in. on PM's my company says check temp split. i have seen plenty of units with good deltas but overcharged, undercharged, bad txvs, etc.....

Do you purge the liquid hose with the suction before you hook up?

You know I started with these, but there are so many times I couldn't connect to a system for what ever reason because of the stubby solid connection, that is why I dumped the fitting and added a the hose instead.

Originally Posted by hydra

I'm with you SLCTECH. I have 4 of these!Attachment 312571

Originally Posted by drife678

Brilliant

X2

Ill be adding these to my arsenal

Brilliant

I'm with you SLCTECH. I have 4 of these!Attachment 312571

so ur saying that if u come to a unit and the filters plugged or ur contactor is blown then u are allowed to put ur gauges on. does that make sense? i dont think so. there is no need to put ur gauges on every single time thats what im saying.

I guess I have seen these posts and I partly agree. I will keep my manifolds in the truck and only grab them if I need to do some deeper diagnostics. Like my 60 pound VETO, I don't haul that until I know I need my arsenal of tools. I have a small tool pack with my Fieldpiece w/amp clamp, Pipe clamp thermocouple, wire strippers, Klein 11 in 1, jumper wires, king-valve wrench, crescent wrench, mini-digital psychrometer, and last of all my custom built quick check pressure gauge. Gauge does upto 800psi so covers the spectrum of 99% of what I would attach it to.
This is how I was taught to make quick SC/SH readings, without hauling a manifold and a ton of tools around. Can quickly jump around the multiple ports of a semi-herm or be in the bowels of a unit at a suction port near the TXV, or on a commercial refer evap getting SH right at the port there.

I don't know how others do it, but I always like to know my pressure and temps, only way to see what the system is doing.Attachment 312441

I agree that gauges are the last thing to be used..... Doesnt make sense to hook em up only to find out ur filters are plugged , or economizer is wide open yada yada!

X2 on insanity's post about guessing the sweet spot. Use ur gauges

oh man huh

guages guages guages.. pull it out read psi... suck it back in.

well i hate to say this ...this old man slaps the gauges on as soon as i get there unless its dead... . been doing it all my life... gauges are my eyes

*

That seems sketchy to me cause your already working with a margin of error of staying around your targeted number for sh/sc, but adding another margin on top of that first margin hmmm.. I don't know. So instead of working with a 3 degree margin of error you may be above or below. If target is a 14 degree sc you got 13-15 to play in, but with that additional margin added by just doing temp probes whats the possibility of a false reading and it telling you that ur below your target temp or above when you were perfectly fine to begin with. I know 410 systems are tricky just like refrigeration units, if your off a few oz. your in for headaches.

Also how do you know your getting accurate readings with only thermometers when you have to guess where the sweet spot is at? Thats a whole lot of probing around. If it does work sounds more likely to be used in a controlled setting in a manufacturing plant where its the same old units running off the line for quality checks. I see diff ambient temps inside/outside of stores, in restaurant kitchens,coolers built into stoves... refrigeration has to be on the money and seems to risky.

Originally Posted by valdelocc

think about a chiller with thermistors only, no pressure transducers,the module translate temperatures to pressures for you perusal, plenty of them out there.

i know exactly what you are talking about...keep in mind that you are assuming that the refrigerant is ONLY the nameplate refrigerant and that there aren't any non-condensibles, no water tube leaks, etc. but if we are going to just go around assuming things, then why do the customers need us? my wife assumes plenty of things about me that aren't true either.

if you are the only one taking care of the unit, then perhaps you can use the two temperature method. but even chillers that use only thermistors have problems too when the therminstors go bad and the unit doesn't know it.

also think about what you are missing. gages will show pressure swings much faster than waiting for the txv to stabilize and give you solid temperature readings that will tell you accurate information.

i am not against the 2 temperature method...it has limitations and in some cases, very serious limitations.

Does not Fluke and/or others have pressure transducers for measuring pressure?

That piping in between the ones I have seen has been about a 1/2 inch.

Originally Posted by jayguy

nope. unless the unit has unit mounted gages (which never seem to be accurate) or unit mounted pressure transducers (which are rarely on the liquid line), i don't see how that would be performed.

think about a chiller with thermistors only, no pressure transducers,the module translate temperatures to pressures for you perusal, plenty of them out there.