The keys are key. Trapped key process and valve interlocks have been used in a myriad of safety critical processes in process industry for decades. By using the right key at the right time, the mechanically defined and sequenced trapped key interlocks prevent wrong operation and sequencing, processing or changeover errors. The 'knowledge carrying link', or the safety providing element in this approach is the uniquely coded key, traveling its way through the process. Taking a critical look at the overall process, the interfaces, the operational execution, the human operator interaction and the system status information 'hidden' in these key movements, the key can become even 'more key'! Feel free to contact us, to help you use your keys to significantly raise your primary safety processes on the levels of flexibility, efficiency, authorization, process knowledge, operator guidance, asset integrity and workflow management. svd@netherlocks.com sales@smithflowcontrol.com sales@netherlocks.com

1. Process interlocking
Process interlocking Valve positioning Partial stroke testing Valve operation
Process interlocking
Process interlocking prevents human error by guiding the
operator through a predefined operating sequence. Valve
interlocks are based on the principle of the exchange of unique
keys, that only allow the right valves to be operated in the correct,
predefined order.
Electronic Key Cabinets - Key Management
Solution
Netherlocks Key Management Solutions enable advanced
key management for mechanical interlocks at a central
location.
www.netherlocks.com

2. www.netherlocks.com
Process interlocking
The Netherlocks Key Management Solution allows
for easy logging and authorization of the use of your
interlocking keys. It offers operators detailed interlock
information and provides insight in the use and status
of your systems.
Know where your keys are
In order to track the whereabouts of your interlocking
keys, you want to know where your interlocking keys
go when they’re taken from their cabinet.
The operator must identify at a touch screen, using a
personal ID code or tag. Key removals are logged in
the cabinet PC. Detailed key movements reports are
available at the cabinet touch screen or remotely.
Avoid unauthorized operation
To make sure that interlocked systems are operated
only by authorized personnel and under the right
circumstances, the system regulates the release of
operating keys.
The operator logs into the system to obtain an
operating key. Based on the authorization level linked
to the operator ID, the system regulates access to
the appropriate keys.
Through the link with your DCS, authorization of key
release can also depend on specific field variables,
status of related systems, maintenance job planning,
etc.
Improve operator convenience
Operators require detailed information about the
systems they operate. When they experience
difficulties, they want supporting materials readily
available.
The Key Management Solution supplies interlocking
sequence information per system. IOM and other
related documentation are all stored and available
through the touch screen.
Instruction videos are available about how to
use interlocks and how to resolve simple issues.
Additionally, customer specific content is easily
uploaded to the system.
Integrate valve operation in your
overall planning
Improve planning of your equipment changeovers
and system operations, by linking the operation of
interlocked valve systems to other planning systems.
The Key Management Solution can be connected to
existing systems of general planning, maintenance
and even work permit systems and operational
planning. This way, it serves as a pro-active tool to
schedule operations and maintenance activities.

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Process interlocking
Characteristics
Our Key Management Solution is added to a
traditional Compact Key Cabinet. It consists of an
integrated PC, dedicated software and a touch
screen. Sensors are added to detect key presence.
Optionally, solenoids retain individual keys
>> Provides digital information about presence of
keys, indicating valve position and system status
>> Logs and reports all key movements
>> Door hinges with safety switches for reliable door
status feedback
>> Local GUI client software for key management
>> Remote access to key cabinet management
application for systems settings and management
>> Remote access to key cabinet environment
for keys and systems status information and key
movements reporting
>> Process interlocking diagrams according to
System ID

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Key management Solution data sheet
Process interlocking
SPECIFICATIONS
Monitor > Integrated full HD 17” (1920X1080 pixels) touchscreen LCD monitor
Processor > Integrated fanless Core i5-3230M PC @ 2.60 GHz; Intel SSD 530; 120 GB, MLC, 2,5”, SA TA6G
Operating system > Windows 8.1 Professional Edition build 9600 (64 bit) license & media UK OEM
IP rating > IP 20
Power supply > 230 VAC, 2000 W max
Network connection > Ethernet IPv4, UTP RJ45 connection
Ambient oparting environment > Temperature: 0 to 50 °C
> Relative humidity: 20% to 90%, non-condensing
Key postions (operational &
master)
> PCB controlled modular IKC cassettes (12 positions per cassette –Sections 1,2,3,4;
10 positions per cassette – Section 5)
> 1 microswitch per key position, 250 VAC 5A, SPDT, 0,25 N
> 1 multicolor LED light (green, orange, red) per key position (25 – 30 mA), (2 – 2.2 VDC)