The New Low-Level Limiter and High-Level Alarm System
With the new system for boilers according to the Pressure Equipment Directive 97/23/EC, we meet not only the latest technical requirements but also offer new highlights in safety, functionality and service.

Boiler safety has a new benchmark.
The level limiters have been granted TÜV and EU type approvals according to EN 12952/EN 12953. These Directives state, among other things, the requirements made on limiting systems and equipment for steam boiler plants and (pressurized) hot water installations. The low-level limiter and high-level alarm system is certified acc. to IEC 61508 for the Safety Integrity Level 3 (SIL 3).

This includes the following safety-related characteristics:




The safety parameters were checked and certified by TÜV Süd – proof of the system’s long-term durability without hazardous failures. The new limiter system NRS 1-50 / NRG 1x-50 is an advancement of the successful series NRG 1x-11 / NRS 1-7, which it will replace by the end of 2010. The new low-level limiter enables the interconnection of two low-level electrodes with one low-level limiter switch, thus fulfilling the requirement for two independently working low-level limiters.

Special features:
> Low-level limiter by interconnecting 2 low-level electrodes with one low level switch
> Automatic, cyclic and redundant self-monitoring
> Forcibly guided safety relays, dual processor
> Error diagnosis for rapid detection of malfunctions
> Instantaneous external signalling for each measurement channel
> Flexible assignment of the output safety circuit contacts support customization for national requirements
> Approved safety over the entire product lifetime


Approvals
EC type approval
SIL 3
Type-approved level limiter

Specifications
Specification: SPECTORmodul Self Monitoring High Level Alarm
Specification: SPECTORmodul Low Water Level Limiter