LN1000 IS Annunciator
7
SECTION 2 SYSTEM DESCRIPTION & FEATURES
General
The LN1000 intrinsically safe annunciator is a totally unique product which allows operators
to monitor the alarm status of critical parameters in any hazardous area. Not only will the
LN1000 give detailed information of the plant alarm status but it can also be used to control
sections of the plant both in the hazardous area and, via isolating relays, in the safe area.
Certification
The LN1000 is certified by BASEEFA to Ex ia IIB T4, with the 8 way version being certified
by BASEEFA to Ex ia IIC T4. This certification is suitable for use in zones 0, 1 and 2.
BASEEFA certify that the product complies to EN60079-0 and EN60079-11
System Sizes
Two chassis sizes are available as standard, a 12 way (size used for 8 way and 12 way
units) and a 32 way.
The chassis always contains the Sequence Card which controls the common functions and
group outputs.
Each Alarm Card monitors two alarm channels, these are simply added to the chassis to
make up the alarm system of the required size.
Complete System
Figure 2.1 on the following page shows a typical system, those parts shown shaded illustrate
an alarm system in its simplest form.
All the complementary parts needed to design a more complex system are manufactured by
RTK and can be supplied together with interconnection diagrams.
RTK Instruments will help in designing systems and providing all components and details of
how the separate products interconnect.
Programmability
The annunciator alarm sequences, functions and features are programmable via the on-
board DIL switches.
This covers different alarm sequences, normally open or normally closed alarm contacts,
first-up groups, output functions and time delays.
Most features are programmable down to each individual alarm way.
Mounting
The standard system is supplied suitable for panel mounting for customers to incorporate
into their control systems.
A wall mounting version is also available for stand-alone systems, these are mounted in IP65
stainless steel enclosures and fully wired to terminals ready for on-site connection via the
bottom gland plate.
