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Digital Epiphany [Uncomplicating the Digital Manifold Gauge]

Posted in Uncategorized on June 3, 2008 by Digital Zeus™

Digital Epiphany: Trending versus Evolution

American Heritage Dictionary – Cite This Source – Share This trend (trěnd)  Pronunciation Key 
n.  
The general direction in which something tends to move.
A general tendency or inclination. See Synonyms at tendency.
Current style; vogue: the latest trend in fashion. 

American Heritage Dictionary – Cite This Source – Share This ev·o·lu·tion (ěv’ə-lōō’shən, ē’və-)  Pronunciation Key 
n.  
A gradual process in which something changes into a different and usually more complex or better form. See Synonyms at development. The process of developing.
Gradual development.

These two words are your key to understanding the crucial significance in the differences that exist in digital manifold gauge OEM’s. I can’t begin to estimate the number of emails I’ve answered and replies on boards that I’ve made in the past two – two and a half years to questions like, “Aren’t all digital gauges the same?” “What’s the real differences in the Refco and the Digi-Cool or the Testo?” “How come this, how come that?”

A day or so ago I was replying to a thread at RE titled simply, “Digital Manifold”. The jist of the thread as it was originally authored was what do you know about the Mastercool digitals. Another member responded that the Mastercools were in his apparently less than scientific assessment, “entry level”. He continued to proclaim – rather proudly I took note that he had just invested – wisely he felt in the digital technology we all know so fondly as the Digimon. Now everyone here knows me, or are at least familiar with my overall philosophy on the DMG – and in particular the Digimon, so I couldn’t resist the temptation to respond to this member. And I did so cordially.

The Mastercool, I am unfamilair with so cannot offer any impressions on them aside from personal opinion based upon what I have read, and I added, everything I’ve read has been published by the OEM – not a wholly reliable source of objective assessment I reasoned.Before I concluded that response, as I typically attempt to do I offered first my opinion of the Refco and advised in my opinion – if ever there were an entry level DMG – the Refco would be it and followed that up with some supportive data to confirm my evaluation.

That thread aside, from a thank you from the OP lie dormant for several days – perhaps approaching weeks, until the other day I received an email notification that a reply to the thread had been made.

To my astonishment another member replied by saying he had looked at the Mastercool website – proceded to quote an introductory paragraph from that website – and concluded based on the information he had gleened from their site – the Mastercool did not appear to be entry level at all.

I have relatively little doubt that my jaw almost certainly hit the desktop. How can anyone I thought nearly aloud, be so naive as to assume that any self biographical description could be taken as law? I mean look at the Digimon fliers – they sound good – look at least adequate, but most of the trade by now knows what lies behind that green casing. But realistically speaking would anyone expect Refco to do otherwise than to project the “tool” in the best light possible? Of course not. Do any of the companies we work for now or have worked for previously run to the local newspaper every time they screw something up and ask to have an advertsiment published listing all of our defficiences for that week?

I responded to the most recent reply in that thread, almost under the assumption that whomever posted that reply must have been joking – but who knows? Mastercool may or may not be worthy of being classified as a digital manifold gauge – an instrument – I don’t know, there is no way to know until it’s been tested and reviewed by our peers – other technicians using it under field conditions. We are negotiating with them to acquire a set for evaluation – rather or not it actually comes to fruition remains to be seen, but that wasn’t the point in my reply to that thread.

At some point in the course of that reply it occurred to me – call it an epiphany or call it what you like but it became crystaly clear to me the key to differentiate these OEM’s.

Does the introduction of any given OEM’s digital manifold gauge follow trending or do they fit into the category of following evolution? Based on the definitions I provided above, at least on the surface the opposition between the two words seem negligible – almost non existent. In fact there is a critical difference in the two.

Some music follows trends, hairstyles follow trends, kids toys follow trends, clothing follows trends. Here today gone tomorrow is a cliche that appropriately fits the characterization of trends. Trends are based on the whimsical notion of something as mundane as what a movie star is wearing, or eating or how they cut their hair. And statistically trends tend to be cyclical – which is a crucial identifying hallmark in the way that SPX views and reacts to the digital manifold gauge. They put the Tif 9600 Series away when they could no longer be given away – only to return with the 41875 and followed suit by putting it away until now – in what they assess as a trend, by introducing the 11000 series that have already began to pick up where their predecessors left off.

Evolution on the other hand is a natural progression of technology – it is the next right thing. It isn’t something that sprang to mind because some engineer had a dream about how they could market a digital version of the analog while making their company untold tens of thousands of dollars – irrespective of it’s inherent failure rate. The true version of the digital manifold gauge evolved applying new technology to achieve with greater reliablity and greater accuracy the same thing the analog gauge was supposed to be doing for the past three quarters of a century.The same reason we are using digital multi-meters, digital combustion analyzers – digital satellite television signals, digital video recorders, digital cameras – fill in the blank yourself, digital manifold gauge are better than their analog counterparts – not just better they are exponentially better in every aspect – if you get the right one.

Does the DMG OEM you are considering making this purchase from have a legacy with the technology? A progressively favorable legacy? You don’t know? Then the answer is probably no. J/B, Digi-Cool and Testo are proud of the legacy they have in this technology – it’s progressive. Each version of the new has been significantly refined in comparison to the previous – but that does not mean the previous was abandoned and rendered obsolete and that’s because each of the successive models fill a legitimate position in the evolutionary ladder – it was not something thrown together to meet the demands of an emerging trend. Each model in any given OEM’s digital manifold gauge series should stand on it’s own merit – if it does not, it has no merit.

It makes no difference if you are an entry level tech or an experienced lead technician if you are considering making a transition from analog to digital manifold gauges – ask these kinds of questions. The more questions you are equipped to ask the OEM – the better you will be able to evaluate the legitimacy of thier instrument as it compares to others.
 

Gauge Manifolds: Let’s Play Games [The Art of Deception]

Posted in Applications, Evacuation, Guides, HVAC PROTech Forum, HVAC PROTech Technical Archives, Recovery - Reclamation, manifolds on May 25, 2008 by Digital Zeus™

This is an active thread on the PROTech Boards and is an excerpt from our upcoming publication,  Manifold Gauges: Φ The Definitive Guide© .

You don’t hear or read a whole lot on the actual manifold as a component I mean comparative to the amount of discussions, threads and articles about the gauge.

This is a piece out of the Manifold Gauge: The Definitive Guide that I’ve been “working” on for the past several months. In the Definitive Guide we look at the hoses, the valves, the analog, the digital and yep, you guessed it the manifold. This is practice in the art of deception at it’s best.

We’re going to play a little game here for the next few days. Take a look at the manifold below – after you get tired of looking at it – in a reply to the thread, tell me what you see wrong with it. I’ll answer it in a few days and we’ll see who’s been paying attention. :mrgreen:

 

For you old codgers, if you can’t see the manifold well enough above, click the image below to open a high resolution copy. :mrgreen: Ready – Set………………………………….Play.

 

I should note this is not a machining error we are looking for. This is a deceptive design practice that we will discuss in greater detail in the Definitive Guide.

Zeus™ Available on SmartCast™ Podcast® and iTunes®

Posted in Uncategorized on May 21, 2008 by Digital Zeus™

Zeus content is now available for subscription to Podcast and iTunes. Including all Zeus AV tutorials future and present.

Subscribe to Digital Zeus With Email

Posted in Uncategorized on May 21, 2008 by Digital Zeus™

By popular request you can now subscribe to Digital Zeus via email. You will receive an email version, one time every day that we add a new artcile to Zeus. To subscribe, scroll down the front page bottom right hand column, above the Zeus File Box and click the link.

Robinair® 14470 Duo-Range Leak Gun [Blast From the Past]

Posted in Uncategorized on May 18, 2008 by Digital Zeus™

Recognize the Model №. 14470? Recognize the look? Be careful, you’re gonna give away your age…….

This is the Robinair® 14470 Duo-Range Refrigerant Leak Gun.  Circa. 1970 – ‘71 ish. Mint condition complete with Operating and Maintenance Manual and spare sensing tip. One of our regular member’s over on the PROTech Boards sent this to me a few weeks back, I’ve gotta do something about this tool habit :) The gun still works – thought it would be fun to share a little nostalgia here. If you have a vintage tool or instrument you’d like to share, send an image or two to digital.zeus@yahoo.com with a brief description and we’ll share it with everyone. 

Inficion® Leak Detector Model Application Chart

Posted in Applications, Charts/Diagrams, HVAC PROTech Forum, HVAC PROTech Technical Archives, Refrigerant Leak Detection, Refrigerant Leak Detectors [RLD], Sensor Technologies, Uncategorized on May 16, 2008 by Digital Zeus™

 

Testo® 556 RSA: First Impressions

Posted in Applications, Data Logging, Diagnostics & Analysis, Digital, Digital Manifold Gauges, FieldTest Evaluations, Guides, HVAC PROTech Forum, HVAC PROTech Technical Archives, Sensor Technologies, Technique, Technology, Uncategorized on May 15, 2008 by Digital Zeus™

Testo® 556: First Impressions

I’m new to the boards here and I’m not sure if this is the section I should post this in, so if I’m mistaken, please correct me.
I received the 556-1 wireless kit the recently and today was the first chance that I got to use it. The first machine it saw was a 3 ton coolair split that is having occaisional low pressure lock out problems. I’m the third tech on this call and I have not seen the machine until today so I figure this will be a good opportunity to see what this DRSA is all about.

Right off the bat it’s plain to see that this instrument, yes instrument is not for every job. It is rather bulky ( when in case ) and I can’t see techs climbing up and down ladders and running around mechanical rooms with it on a daily basis. I don’t know about you but I like to travel light and usually only carry a small tool bag. I’ll go back to the truck if I think I need gauges. All of my work is commercial and more often then not the problem is electrical in nature. Besides I think that most of us here can tell if a unit is running okay just by feel alone.

With that in mind I have to say that this is the first set of digital gauges that I have ever used and you know what ? I like them. On the call I was on today first tech says TXV is bad, second tech says unit is under charged and has dirty condenser coil. I check and find 125 foot pipe run, 2 liquid line driers ( one at c/u and one inside a/h ), poor airflow evap and excessive pressure drop at a/h. what the 556 allowed me to do was measure pressures,superheat and sub cooling at both locations record them and download them to my laptop all on site. Gauging up was easy and most important of all, quick. The ability to record and transfer the data gathered is not to be underestimated.

The 556 seems rugged enough for its intended use and was relatively easy to set up initially. The display is clear and easy to read and the backlight worked very well. What a pleasure it was to actually see superheat and subcool values along with pressure without having to stop and consult pt chart and then do calculation. I can see that the accuracy of this instrument is a vast improvement over analog gauges. I can tell you that I checked system with my Y/J manifold and when I disconnected them the low side gauge needle was stuck at 15 psi. They were less then a month old and weren’t dropped that I know of. If I wasn’t convinced before I am now.  

Read More of This Evaluation at HVACPROTech.com®

The Only Professional Technicians Boards with Comparative Instrument Analysis

Everyone – This is exactly what i’m trying to get at. It is s fact of life in most companys that you can’t always get the same tech back to the same call. The variability of readings across different gauges and techs is what I would like to see minimized. I Know that for a purely empirical test of analogs vs digital ( excuse me DRSA’s ) I would absolutely agree that duplicating sensor locations and hose connection locations is rule # 1.

The very reason that i even purchased the 556 was so that i could develop some level of confidence in the readings taken by multiple techs across all types of equipment in sometimes less than optimal conditions. Some techs have $400 multi sensor temp kits, some are using fieldpiece, one kid even showed me where he tucked the tip of his pocket digital thermometer under the suction piping insulation. Add to that the inaccuracy inherent in analogs and we can all see that is time for a change.

Field Applications

Hello everyone – today was the third time i have used the 556. today’s patient was a 80 ton Trane water cooled VAV unit with four compressors, each with single circuit. Age of unit is appx 20 years old. Several of these units have developed leaks and I havn’t found them all yet. I’ve used electronic leak detectors, Halide torches, bubbles and dye. As this is typical of the type of service work most of us encounter I thought it would be a good trial for the 556.

The 556 is rugged and appears well suited to field use. It is very easy and intuitive to use and dare I say fun. What a pleasure it is to watch s/h & s/c readings in real time. Here is a picture of the setup I used before the TESTO arrived.

 I underestimated the time saved and ease of gauging up to equipment.. I attached wired probe to LL line and wireless probe to suction line. I left radio handle inside unit and it broadcasted temp signal to 556 flawlessly. Yesterday I could not get it to read s/h & s/c values. Then I realized that I forgot to enter refrigerant type. After that okay. Here is a picture of both the old way and the new way of checking charge. I like the new way better.

The only place to find hard field data on the diagnostics instruments you use. HVAC PROTech.com® http://www.hvacprotech.com