Smoke Alarm User Manual

23
Note: This document is based on the recommendations of BS5839 Part 1: 2002. It is intended only as a guide to the application of fire detection systems.
Reference must be made to relevant national and local standards.
2251EIS INTRINSICALLY SAFE DETECTOR AND IST200
INTERFACE
The 2251EIS analogue addressable photoelectric sensor is a
plug in Intrinsically Safe smoke sensor combining an optical
sensing chamber with analogue addressable communications.
As an Intrinsically Safe sensor, the 2251EIS has been designed
specifically to provide fire protection for most hazardous
environments, and has therefore been engineered so that it
cannot become a source of ignition in areas where potentially
explosive atmospheres are likely to arise.
The IST200 translator module serves as an interface between
the control panel and up to a maximum of 15 x 2251EIS smoke
sensors. The IST200 must be used in conjunction with a
Y72221 custom galvanic isolator barrier.
Tested and approved to EN54-7 and by BASEEFA (2001) to
EEx ia IIB T5 for use in Zone 0 hazardous areas.
Specifications
Note that there are limitations of capacitance, inductance and
inductance/resistance ratio connected within the hazardous
area. Reference must therefore be made to product data
before installation of these devices.
Voltage: 17 to 24VDC
Max. standby current: 330µA
(One communication every 5s
with LED blink enabled)
Max. alarm current: 4.2mA at 24VDC
Weight: 102g
IST200
Input Voltage: 15 to 32VDC
Output Voltage: 20 to 24VDC
Supply Current: 14mA at 24VDC
Dimensions: 70mm x 70mm x 32mm (h x w x d)
Weight: 142g
System Sensor Intelligent Product Range