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Silo Guard Overfill Protection SystemSafety and Health Levelflex
M / Cerabar T / RIA452
Silo arrangement Tank lorry unloading Levelflex M FXA520
Features
Silo guard consists of a continuous guided
level radar Levelflex M, Cerabar T pressure
sensor, remote displays with integrated
alarm relays
Optional remote data access and control
with Fieldgate inside, sends you an SMS
message or e-mail in an overfill emer-
gency
Visual and audible high level & pressure
overfill alarms in pneumatically filled
powder bins
Benefits
Eliminate the prospect of silo damage
Meet requirements of local health and
safety for over filling
Prevent environmental emission issues
Assist you in preventative maintenance
Bulk storage of cement in silos is the prefer-
red method of storing cement for concreteproduction.
The following recommendations can ensure
the safe, clean and trouble-free operation of
cement silos.
Endress+Hauser can fit each silo with
a Fieldgate based silo guard monitoring
system which will allow e.g. the concrete
plant operator or cement supply compa-
ny to remotely monitor the bin levels to
optimize the supply logistics by setting refill
level alarms.
Silo Guard with Fieldgate inside
Each Fieldgate module can link to up to 30
control instruments via standard processindustry communication
protocols such as
4-20 mA HART, PROFIBUS to Ethernet
and transmit measurement data over a wide
area network through standard telecom
lines or via GSM. Data can be accessed
through the Internet using standard web
browsers and exported and saved in stan-
dard formats.
Cement silos should be erected securely
and inspected regularly. Concrete hardening
though is inevitable and can seriously affect
the accuracy of silo weighing systems if
not cleaned regularly. The only accurateand trouble free way of
determining the
silo cement content is using a continuous
level sensor such as a guided or free space
radar device Levelflex M FMP40 or a free
space radar measurement Micropilot M
FMR250. Endress+Hauser radar accuracy
is not affected by plant vibration, moisture,
high process temperatures or excessive dust
clouds during filling.
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Instruments International
Endress+Hauser GmbH+Co. KG
Instruments International
P.O. Box 2222
79574 Weil am Rhein
Germany
Tel. +49 7621 975 02
Fax +49 7621 975 345
http://www.endress.com
[email protected]
CS 007B/11/en/01.05
555001829
IMPR/INDD 2.0
Remote viewing and multi silo monitoring
Radar measurements do not require
repeated calibrations after an initial setup to
guarantee measurement integrity.
Silos and supply lines should be clearly
marked to display the type of cement
which they contain. Endress+Hauser has
a range of bright easy read silo level or
pressure displays which can be wall orpanel mounted on the silo
or near the tank
loading nozzle in the truck loading area.
An Ecograph panel mounted recorder will
clearly indicate the actual silo content and
corresponding bin level and pressure, as
well as record the mix ratios of the material
feed. Advance planning will facilitate deli-
very at specified times.
The level of cement in the silo should
always be checked before filling begins.
Ensure that the time between filling of the
silo and shutting off the cement supply is
kept to a minimum to avoid overfilling. Asthe bulk density of
fresh cement varies, it is
therefore advisable to be conservative when
estimating the weight of cement required
to fill a silo.
A pressure relief valve and sensor is neces-
sary should excessive air pressures build up
in the silo.
Filters are necessary to remove cement dust
from the excess air leaving the silo during
the filling operation. The air filter is often
located on top of the silo with extracted
dust allowed to drop into the silo below.
Most modern filters are self-cleaning pres-
sure filters. While a minimum of attention
is required with these filters, it is recom-
mended that a regulary check of the filter
efficiency be made using the pressure sen-
sor electronic control unit. Endress+Hauser
offer a complete range of pressure gauges
including the cost effective Cerabar gaugeand Deltabar S
differential pressure sensor
which can be flange mounted to the silo
and monitor for blocked or burst filters.
The sensor comes with an abrasion proof
ceramic or stainless steel cell and the
display and programmer can be mounted
separately.
Overfilling can cause severe dust emissions
from the silo and the structural soundness
of the silo may also be put at serious risk
posing a threat to personal safety. The inclu-
sion of a high level alarm is recommended
to avoid the consequences of overfilling.
Endress+Hauser has a range of cost effecti-
ve high level switches for bulk solids which
include the Soliphant T/M vibrating forks,
Solicap M capacitance probe or Soliswitch
rotating paddle switch. All switches can be
easily mounted as a rod from the tank side
or suspended from the silo roof on a rope
or cable.
Local guidance information for the cement,concrete and quarrying
industry generally
states a requirement for:
Prevention against over-filling of silos
with a high level device
Silo operating conditions must not exceed
manufacturers specifications
The Endress+Hauser Fieldgate system not
only optimizes cement logistics and the
reorder process but can be used as a per-
manent silo guard which will automatically
distribute data triggered by silo overfills,
over pressurization or burst filters. The
alarms can be sent directly to your mainte-nance engineers
mobile or cell phone via
SMS or to a service center via the telephone
network as a fax or e-mail message.
With an Endress+Hauser Silo Guard System
accidents will be prevented and your plant
control will be in safe hands.
