Diagnostic Coverage for SIS Solenoid Through Interposing Relay
SIL 2 loop of a Logi solver (Hima Himax), I/P relay (Phoenix) and Solenoid (ASCO 327)
a question about intrinsically safe instrument
What happens if we install an intrinsically safe instrument without installing a safety barrier before it?
By d on 16 June, 2019 - 3:27 pm
The barrier is for Fire Safety. You should know that it is based on the Area Classification for...
Intrinsic Safe Barrier as Surge Protectors
Can intrinsic safe barriers also serve the purpose of surge protection or just current limitation in case of any fault?
Grounding an Equipment Enclosure
Grounding an equipment enclosure to an available TGB
By d on 16 April, 2019 - 1:54 pm
Is this what you are dealing with? "Type 1 [NEMA] Enclosures constructed for indoor use to...
By magic_din on 16 April, 2019 - 5:38 am
I didn't state enough info. Assume no place to lug on the outside of enclosure, and no built in...
By Hugo on 13 April, 2019 - 4:54 pm
Depends, if you just need to ground the enclosure, bolt a lug on the outside and ground directly...
Questions About SIL 3 System Requirements
What are the requirements for SIL 3 system?
By demigrog2 on 26 March, 2019 - 12:10 pm
I think it is unfortunate that the "SIL" term is used for both components and the system;...
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
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?