Prestart Alarm Units I.S

Prestart Alarm Units I.S

Features

  • Simple, robust and functional
  • Low cost alternative
  • Intrinsically safe - Ex ia
  • Long distances achievable - Fully down line powered
  • No repeaters – no batteries
  • Alarm output duration = zero to indefinite
  • Dual state output allows alarm / warning as well as healthy / safe to be broadcast

Applications

The Alarm Units can be used anywhere that a single or dual state warning or permissive function is required. Typical applications include conveyor pre-start alarm and remote isolation indication, evacuation systems, and remote / distributed security system monitoring. The most popular of these are:

1 Conveyor / Machine Pre-Start / Operating Warning

An audible and visual (red flashing) alarm is sounded at each alarm site, while ever voltage is applied across the P1/P2 terminals of units (P1 positive). In this mode up to 90 units can be connected at 100mtr intervals on 4mm2 cable to provide overlapping performance over the entire length of an 8.9km conveyor. The alternate (green) state lights a solid green light at each alarm site and (if required) can be used to confirm whole current remote isolation.

2 Evacuation / Keep Clear Alarm

A large evacuation area can be supervised by a single system. System ‘ready’ status can be continually broadcast and observed by leaving the system in the Green State. The entire area can be placed on alarm / evacuation footing from a central command. E.G. tunneling or confined workplaces, Colliery Dolly-car Drifts – lift shafts, etc.

Specification

Supply Voltage
12.5 to 30V (Ui=30V)
Supply Current
8.3mA (18V)
Alarm Tone
Alternate Two tone – 2.8 / 3.7 kHz
Sound Pressure Level
83dB @ 1m nom. (>12.5V)
Luminous Intensity
Red: 3800 mcd nom.(≥15.5V)
Green: 750 mcd nom.(≥15.5V)
Operating Temp. Range
-20 → 40°C

Ordering Information

Select product(s) for project list, then add to list.

Product name Product number
IS Alarm Unit – 3 way in Orange box AL24X3O_IS
IS Alarm Unit – 3 way low cost variant AL24X3G_IS

Resources and Downloads

Brochure
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