I received a request for information about process safety time. I thought that some members of the list might be interested. ...
Using SIL-2 Devices in SIL-3 Loops
Can we use two SIL-2 capable sensors in 1oo2 configuration in a SIL-3 loop?
By masoud sadra on 26 February, 2019 - 11:54 am
Ahmet, It`s not true. you can use lower SIL rated device in higher loop as long as you maintain...
Security of Modbus Data Packets Against "Man-in-the-Middle" Attacks
Posted by sritam paltasingh on 29 October, 2018 - 12:38 pm
Security of modbus TCP data packets implemented via libmodbus
Questions About SIL 3 System Requirements
What are the requirements for SIL 3 system?
Intrinsic Safety Barrier Selection
Calculation methodolgy for IS barrier entity parameters.
Mounting Two SITOP Power Supply Units Side-by-side
I am installing two SITOP 6EP1334-2BA20 power supply units side by side in my panel
GE 9HA DLN 2.6+ Combustion Modes
Posted by AbdulRehman on 11 July, 2018 - 8:11 am
Differences between DLN 2.6+ combustion modes
Single transmitter for two ESD outputs
Single transmitter for ESD on HH and LL
New Fire Extinguishers Use Water on Electrical Fires
Posted by Gerald Beaudoin on 27 June, 2012 - 8:29 am
the latest generation of fire extinguishers employ a mist of distilled water. To what voltage would this be safe as we have a lot of 600VAC equipment?
By telly reyes on 18 May, 2018 - 6:07 pm
So my question is: if I have a metal fire extinguisher on an electrical fire and if I tried to use...
Barriers for Pressure Sensors, Temperature Sensors, and Solenoids.
Requirement of barriers in control panel (safe area) for instruments (sensors & solenoids) which are in gas group IIA/IIB. (application compressor)
Ex nAC Device in Enclosure Ex e
I want to use an Ex nAC device in Ex e enclosure.
By Mr Sweeney on 14 May, 2017 - 6:18 pm
Hi, >Can I use an Ex nAC device in enclosure Ex e or this device >must have an Ex de...
Exd vs Exi Transmitters/Devices
Application of Exi or Exd devices in oil//gas industry
Electrical Equipment Protection in Hazard Areas
Some questions regarding electrical equipment protection in hazard areas.
What is the major difference between SIS (safety instrumented system) and HIPPS (high integrity pressure protection system)?
Barrier for Temperature Sensor
Does temperature sensor (Pt-1000-Skin type) require barrier/isolator in flameproof panel when used in hazardous zone 1 area?
What is the HFT of QMR system?
What is the HFT of QMR system? Comapre QMR with TMR??
Pressurized Nema 4x Enclosure
Certification for a pressurized Nema 4x Enclosure for hazardous location
Wiring Up 7 Emergency Stops on a Conveyor
Looking for a diagram for wiring emergency stops on a conveyor.
By d on 6 April, 2017 - 2:59 am
Without the ladder or Logic drawing of the plc controls it is not possible to properly assess what...
Electronic Circuit Protection
Surge/Transient/Lightening protection of transmitter.
Using a intrinsically safe positioner in non-hazard area
Ex ia Transmitters and Barrier
Using an Ex ia transmitters without a barrier
Can Zone 2 Gc Equipment Inside a Zone 1 Gb Ex de Enclosure
Can zone 2 IECEx equipment go inside a zone 1 rated panel, or, is the atmosphere inside a Ex de Gb panel de-rated to zone 2?
What kind of experiences have you had with industrial viruses and malware?
Wireless Transmitter for High Temperature Application
Need Wireless Transmitter for high ambient temperature.
Shutdown and Blowdown Valves in Oil and Gas Processing
Looking for safety information on Shutdown and Blowdown Valves
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?