1. Accelerator PSS Radiation Monitoring
Stuart Birch
1st March 2017

2. Contents PSS1 Radiation Monitor Key Monitor functions
High Level System Architecture

3. Radiation Monitor Alarm LED’s LCD screen Keypad Interlock LED’s
Interlock Termination
Enclosure
Interlock Enclosure

4. Key monitor functions MR-002
 SIL 2 Certified Alarms
The monitor shall have two SIL 2 Alarms (1 high and 1 fail alarm). The
‘high’ alarm is triggered when the ambient radiation level
exceeds the preset threshold.
The ‘fail’ alarm is set when
the count-rate falls below the preset level for the detector
(detector in failure).
 Each relay contains:
three sets of contacts, two 2 pole change-over a one single
pole N/O contact set.
NB: The relays operate in the fail-safe mode; energised during
normal operations and shall be SIL 2 compliant.
MR-004
Monitor Visual Alarms.
A visual indication is provided in the form of a red LED for monitor failure and alarm. Failure indications include mains
failure, and monitor failure. The type of failure shall also be displayed
on the LCD screen.
The monitor shall provide attention, alert and alarm visual
indications for the portion of the Interlock SIL monitor
via red and green LEDs located on the front panel.

5. Key monitor functions MR-005
The monitor shall provide attention, alert and alarm audio and visual
indications on the monitor via red and green LEDs located on the front panel and a sounder 100dB maximum (the sounder can be a standalone device which can interface with the monitor)
MR-009
The monitor shall update the measured values at a configurable rate with a minimum rate of 10 seconds and adjustable in steps of, at a minimum of 1 second.  
MR-011
Detector Interface.
Universal detector interface (UDI-1G)
Provides a high performance interface between detector and measurement system
The output stage is designed to drive long cables reliably
Maximum probe separation is 100m (330ft) directly from the UDI and >1100m (3600ft) with external power unit
MR-012
Self Test.
The monitor shall continuously self monitor for faults. Checks shall include:
Detector failure
Power failure
Detector over range

6. Key monitor functions MR-013 Data Storage.
The monitor shall have the capability to:
Provide non-volatile data capability for a minimum of 7 days count history at a minimum 5 minute data log intervals with a historical review on the LCD display.
Non-volatile data capability for event history (last 100 events)
Non-volatile storage for operating parameters

7. System architecture

8. Thank You