Active and Passive Barriers
Difference between active and passive intrinsic safety barriers
By Nik Ammar on 3 January, 2017 - 6:53 am
The details of the topic is of course very complex. But the concept is very simple actually. The...
Placing a Motor in an Explosion Proof / Intrinsically Safe Location
What are the physical/electrical barrier requirements if I want to locate a motor in a hazardous location with its associated drive outside of the hazardous location?
By Bob Peterson on 9 December, 2016 - 12:42 pm
One other thing. In general, Division 1 areas are surrounded by division two areas. So even if...
By Bob Peterson on 6 December, 2016 - 8:52 pm
this is not really a DIY type of project. You might want to get some experienced help. Having...
Basic difference between Zone-2 and Zone-1 equipment
Exd/Exe equipment for Zone-2 and Zone-1
By will hunt on 11 November, 2016 - 12:24 pm
Hello Please be careful following zone 1 and zone 2 certifications. They are designed to protect...
Requirements for Sil 3 System
Questions about SIL 3 system requirements
By W.L. Mostia on 14 October, 2016 - 8:27 pm
You should not be implementing a SIL 3 system unless you know how to so. This is not a learn as...
does Ex d Ib need IS barrier?
does Ex d Ib instrument need IS barrier?
For ATEX Ex certification, is the barrier/isolator included in the equipment when the ATEX marking is: Ex ia d IIC?
Ex ia and IECEX Flameproof, ATEX Flameproof, CSA/US-Exp.
can we use IECEX Flameproof, ATEX Flameproof, or CSA/US-Exp device instead of Ex ia rated device for Zone 1?
By gunawan556 on 5 August, 2016 - 4:09 am
There is flameproof rated device available for zone 1. But the type of protection which are...
By Bob Peterson on 4 August, 2016 - 6:03 pm
*WE requested supplier to supply Ex ia rated device for Zone 1 and he replied he can only supply...
Are IS Barriers Required for Instrumentation Rated Class II?
Is Safety relay controlling multiple control relays advisable?
Chemical Resistant Enclosure Experience/Advice Needed
Our enclosure gaskets are melting due to acidic enviroment.
Use of Ex'i' Certified Transmitter Without Isolating IS Barriers
Posted by Mohan Jayaraj on 23 April, 2016 - 1:59 am
Can Ex'i' certified transmitters be used in zone 2 without applying IS philosophy?
Connecting Ex na [iC] Field Device
Connecting an Ex nA nC [ic] device and zenner barrier
Instrument Valves for Oil Pumping
Types of valves for circuits in oil pumping and gas compression. controlled safety valve or valve mechanical safety?
Intrinsic Safe & Non-intrinsic Safety Cables
Differences between intrinsic Safe & Non-intrinsic safety Cables
By StrangerOnTheInternetInADifferentCountry on 9 February, 2016 - 1:36 am
> So if I use NIS cable in hazardous areas then is it OK? You will still need to use the...
Fire and Gas System / Safety Instrumented System
Using SIL-2 Devices in SIL-3 Loops
Can we use two SIL-2 capable sensors in 1oo2 configuration in a SIL-3 loop?
Laying of RTD heat tracing cables in Intrinsically safe and non IS categories
NEMA 4 Enclosure Installation Best Practices
How to install Free Standing Nema 4 Enclosure on concrete pad, with bottom entry conduits, while maintaining NEMA 4 Rating?
By Bob Peterson on 4 February, 2016 - 1:43 pm
I prefer type 3R enclosures. They often come with the whole bottom open. Cut what you have to and...
Instrument grounding: arguments needed...
RTD Cable Outer Sheath Colour in Hazardous Area
IS temperature transmitter in hazardous area. What colour shall the remote RTD cable's outer sheath be - Blue or Black? What if a thermocouple is used?
Learning about safety PLCs
By James Ingraham on 20 January, 2016 - 3:55 pm
> I've transitioned from a job with mega-relay logic to one > with safety PLCs! Any...
E-Stop Regulation: Hardwired vs. PLC Controlled
Is there a law or regulation that clearly states that you are not allowed to use a PLC to execute a E-stop procedure?
By James Ingraham on 18 January, 2016 - 11:11 am
> Typically, if the equipment can be run in hand at the starter or > vfd, then the e stop...
By Scott h on 16 January, 2016 - 8:30 am
Typically, if the equipment can be run in hand at the starter or vfd, then the e stop needs to be...
By Bob Peterson on 15 January, 2016 - 12:59 pm
I would suggest this. The first thing that has to be done is a risk assessment. That will tell you...
EXd Flameproof Enclosures
What is the correct solution for a flame path in a flameproof enclosure?
Combination of Ex d and Ex m through I.S. barrier