On Line Set Point Servo System (OLSPSS)
Introduction
This is an automated system to test trip points of plant safety system by servoing the input signal around the set point. Facility also exists to move the input signal to full range & also above full range & below the minimum range for on line live signal calibration. The output leads are connected across 4-20mA terminators of the system under test. This test & monitoring sequence neither disturbs the field loop current nor the wiring of the inputs to system under test.
This method helps the plant maintenance, as wiring need not be disconnected to calibrate or to test the safety signals. This method also avoids fear of wrong connections & loose connections after the plant maintenance. This method increases the safety & availability of the plant.
Specifications
| Principle | Current injection through floating source |
| Mode of operation | Response test / Accuracy test / Calibration mode |
| Operator interface | Local panel keyboard display Display station centralized PC |
| Operator interface | Field current Floating current injected |
| Current source | 0-25mA |
| Configuration | Triplicated independent Test Units can be connected to a centralized display station through serial isolated link |
| Safety interlocks | Single channel single input being tested at a time |
Application
This can be used for OEM application for test & monitoring unit for plant safety systems for on line live checking & to make hand held live field calibrators.
For further information please contact
Head,
Technology Transfer & Collaboration Division,
Bhabha Atomic Research Centre,
Trombay, Mumbai - 400 085
Tel : 091-022-25505337/25593897
Fax : 091-022-25505151
E-mail : headttcd@barc.gov.in
