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sonde d ambiance d humidite et de temperature hygrasgard rftf u ntc1 8k 0 10v ntc1 8k 1201 41a1 2012 000 p9665Produit de qualit pour le secteur HKL, prcision 3 % HR Le capteur dhumidit et de temprature HYGRASGARD RFF RFTF, calibrable, mesure lhumidit relative et ou la temprature de lair. Il convertit les grandeurs mesures dhumidit et de temprature en un signal normalis de 0 10 V ou 4 20 mA, est disponible au choix avec afficheur (pour afficher la valeur relle de lhumidit et de la temprature) ou sans afficheur, dans un botier lgant en plastique avec couvercle
Produit de qualité pour le secteur HKL, précision 3 % HRLe capteur d’humidité et de température HYGRASGARD® RFF/RFTF, calibrable, mesure l’humidité relative et/ou la température de l’air. Il convertit les grandeurs mesurées d’humidité et de température en un signal normalisé de 0-10 V ou 4...20 mA, est disponible au choix avec afficheur (pour afficher la valeur réelle de l’humidité et de la température) ou sans afficheur, dans un boîtier élégant en plastique avec couvercle à encliquetage, base avec fixation 4 trous, pour le montage sur des boîtiers UP installés verticalement ou horizontalement, avec point de rupture pour le raccordement en saillie, ou dans un boîtier en acier inoxydable (parties supérieure et inférieure en acier inoxydable, couvercle vissé) pour des applications résistantes au vandalisme, par ex. dans les écoles, casernes et bâtiments publics. L’humidité relative (en % HR) est le quotient de la pression partielle de vapeur d’eau et de la pression de vapeur saturante à la température de l’air correspondante.
Le transmetteur de mesure est utilisé dans des environnements non agressifs et exempts de poussière, dans la technique du froid, de la climatisation et des salles blanches, dans les locaux intérieurs/d’habitation, bureaux, hôtels, salles techniques, lieux de réunion et sites de conférences. Il est conçu pour une détection précise de la température et de l’humidité. Un capteur numérique à stabilité élevée dans le temps est utilisé comme élément de mesure pour l’humidité et la température. Un réglage fin peut être effectué par l’utilisateur.
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4.0 ★★★★★
Based on 26 reviews
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Product Reviews
★★★★★ 5
A Very Enjoyable Camino Pilgrimage
Format: Kindle
A detailed 40 day journal format of one pilgrims experience upon the Camino Frances. She revisits the various personalities she encountered along the way and discribes the tough terrain and weather challenges which in turn push her to the limits of her physical abilities. In the end, she perseveres and eventually finds a change in the hardness of her heart ...the Camino is known to do this.
Great book and I enjoyed it thoroughly...I purchased both the text and audio versions to read along. I highly recommend it for any potential pilgrims or for anyone seeking to enjoy a 800km hike in Northern Spain. Thanks for bringing me along!
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Reviewed in the United States on March 9, 2021
★★★★★ 5
Well Presented Concepts and Implementations (5th ed.)
Format: Paperback
Foreword: I have been running my own DNS servers on OpenBSD and FreeBSD for about 4 years. All of my previous DNS knowledge was obtained from the man pages and online tutorials.
The book is great because the example network used throughout the book is built upon, showing you how to "grow" your DNS with your expanding network. The design and implementation presented is priceless and covers some of my favorite topics: placement of slaves, hidden primaries, building root servers, split views, daisy-chaining, forwarders, partial-slaves, address maintenance issues, etc. The pros and cons of each setup are weighed and best practices are suggested. If you like a generous helping of diagrams, examples, and tables as a learning aid, you won't be disappointed.
One specific example of weighing the pros and the cons is presented on page 479 as follows:
"Could we have saved a few bucks on hardware by using our external authoritative nameservers as forwarders, too? Sure, but that would have presented a risk." After that statement, they proceed into all the details of "why."
There is adequate coverage on security. The authors preach defense in depth. An implementation example includes hiding your masters and only exposing bastion slaves. Securing communications between the masters and slaves is also covered in the security chapter using DNSSEC and TSIG. I think IPSec is another way to add a security layer, but that is probably another book.
After reading the book, I started to implement my new DNS infrastructure and found myself referring to the index often. It is fairly consummate, however, I found a few things missing, such as the $GENERATE statement. Also, some of the configuration details were lacking slightly. For example, the order in which ACL elements are processed and how negated elements affect the processing outcome. Another question I had was, what would happen if an ACL name is negated, and what if that ACL contained some negated elements. Well I found my answer by actually trying it and verifying with the canonical reference docs on isc.org.
I gave this book five stars because of its effectiveness in presenting the concepts and implementations of DNS using examples, good writing style, tables, and diagrams. If you're looking for the last 4 percent of the diminutive details of DNS, you will find it on isc.org.
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Reviewed in the United States on August 22, 2006
★★★★★ 5
Good DNS reference
Format: Paperback
The Book is a good reference for BIND9 DNS administration. Although, at this time, it's a bit outdated. It wasn't written to reference DNSSEC, or other new configurations.
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Reviewed in the United States on January 2, 2025
★★★★★ 4
Overall it was an OK book. I am already ...
Format: Paperback
Overall it was an OK book. I am already "competent" with DNS, specifically the BIND9 implementation but I got the book as reference material since the official documentation is a little sparse. The fifth edition (not sure about the others) even covers, albeit a little too briefly, how to deal with reverse lookup zones with subnet masks that do not fall on octet boundaries.
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Reviewed in the United States on July 31, 2015
★★★★★ 5
Domain Names...Serves us!
Format: Paperback
This is the most complete and must-have DNS book i've ever seen before. Nor only prepares you to understand every basic and some advanced issues about DNS, it also shows a lot of "tricks" with the most powerfull and well know - famous DNS implementation!: BIND.
If you are a beginner in the DNS world, this is a good step towards become an expert, if you're already an expert this guide will surely show you a lot of useful information in your daily DNS administration problems.
Definitely, this was one of my best investments on my way to become a site administrator.
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Reviewed in the United States on June 11, 2011