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Approval Certificate ~ operation ~ alarms ~ compliance ~ support ~ mechanical ~ further comprehensive details
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Benefits Water ingress alarm for cargo holds insensitive to product type or build – up.
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 ‘Bulksafe’ water Ingress
detection monitoring & alarm System draws upon almost 30 years
of PSM’s experience in supplying monitoring and alarm systems in
shipboard liquid levels to provide a robust, reliable, simple to install
and operate solution for this critical water ingress detection in cargo application for bulk carrier
safety. To
cover all applications a choice of sensors is offered (hydrostatic
& RF admittance), both are solid state devices with no float or
other mechanisms to fail, or in-built filters requiring regular
cleaning, both provide a 4-20mA
2 wire output which gives 4mA when the cargo hold is empty.
This ‘live zero’ signal provides an immediate indication of
sensor health, a feature not available to simple switch devices. Any
water ingress which is detected while the tanker is underway will
immediately cause this output signal to rise triggering an alarm
condition.
Systems
based on the hydrostatic sensor require only one sensor per hold to
detect both pre and main alarm conditions, sensor and system
operation may be checked at any time irrespective of hold status by
using a simple test
mechanism built into the deck
termination enclosure. No additional compressed air or water services
are needed to effect this test.
For
additional refinement the RF Admittance based sensors incorporate full digital communications using the global standard modbus
protocol. A 2 wire multidrop network links all alarm sensors to the
central monitor, and embedded diagnostics in the sensor continually
monitor its operational health. Any errors are immediately reported.
The modbus link also enables full remote testing and water detection
alarm condition simulation from the Bridge. On receipt of an
instruction from the central monitor a sensor can set its 4-20mA
output to any value, irrespective of the status of the cargo hold.
Where
the RF sensors are employed two are fitted per hold giving enhanced
redundancy. Other
dry spaces requiring only a single alarm point are fitted with one
sensor Installation / retrofit is simple, the sensor is supplied with the required length of cable and simply mounts within a shipyard suplied pipe, clamped to the inside of the tank. Where holds have a lower stool and or a keel duct alternative installations are possible PSM provide a full range of support fittings and tank penetrations to suit any requirement, and will be happy to supply suggested installation drawings. 
Simplicity of operation is a key feature. The user is guided by a full menu structure and all messages and prompts are provided in plain English on a backlit LCD display. Dedicated function buttons provide immediate ‘shortcuts’ to auto-calibrate and system tests, and dedicated visual annunciations provide immediate identification of ‘all clear’, “Alarm, active”, “system fault” and “power-fail” conditions. Water ingress detection
in cargo alarm conditions also trigger an internal
relay which may be used to drive external remote mounted audible and
visual annunciations. If required repeater displays are available for
remote locations These communicate with the primary display via a 2 wire
RS485 serial link and provides an overview of the entire system status.
This remote display can also be used to acknowledge alarm conditions.
Multiple remote displays can be connected if required.
Each
4-20mA loop is protected using a Zener Barrier.
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For a list of our main contact info at PSM and email addresses please click here |
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![[ISO9000 2000 accredited company]](images/iso9001smallest.gif)
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 PSM Instrumentation Limited Burrell Road,
Haywards Heath, W Sussex RH16 1TW  |
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Bulksafe is a registered Trademark. All rights reserved 2003 |
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Send mail to
info@bulksafe.org with questions or comments
about this web site. |
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