FULTON VSRT Series Installation, Operation And Maintenance Manual page 114

APPENDIX - A
GWR •
•
•
•
•
VF •
•
•
Conductive •
•
•
GWR & VF •
•
2 x •
Conductive
Glossary of terms:
SIL2:
Safety Integrity Level 2 – Applied to a system or part of a system to indicate that the Probability of Failure on
Demand (PFD) is in the region 10
SIL3:
Safety Integrity Level 3 – Applied to a system or part of a system to indicate that the Probability of Failure on
Demand (PFD) is in the region 10
PFD:
Probability of Failure on Demand. The likelihood that a safety device or system will fail if the system needs to act
to prevent a dangerous occurrence.
GWR:
Guided Wave Radar level measuring and limiting probe device.
VF:
Vibrating Fork Level limiting probe device
Limiting device:
A device that stops a machine if the machine enters an unsafe state or if the limiting device detects a fault with
itself.
Fulton Ltd
5 Fernhurst Road, Fishponds,
Bristol, BS5 7FG
England
Every effort is made to ensure accuracy at time of going to press. However as part of our policy of continual product improvement, we reserve the right to alter specifications without prior notice.
VSRT-IOMM-2019-1
Pros
Works with RO and DeMin Water
SIL2 low water limiter function
Doesn't mistake foam for water
level Provides an analogue
signal
Doesn't attract scale
Function not affected by low level
scale or debris build-up.
Works with RO and DeMin Water
SIL2 low water limiter function
Doesn't mistake foam for water level
Probes can be cut to length
SIL2 low water limiter function
Detects water tracking across insulation
Two separate technologies to reduce
probability of undetected double
failure.
SIL3 low water limiter function
SIL3 low water limiter function
to 10 .
-2 -3
-3 to 10 -4 .
Tel: +44 (0)117 972 3322
Fax: +44 (0)117 972 3358
Email: sales@fulton.co.uk
Website: www.fulton.co.uk
TI-149-High Integrity Water Limiters-2017-2
Cons
• Probe lengths need to be ordered to
size within a range
• Probe lengths need to be ordered to
size (can't be cut to length)
• Mistakes foam for water level.
• Function affected by low level scale
or debris build-up.
• Two probes of the same technology
increase the probability
undetected double failure.
Fulton Ltd
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