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Process configurations
(Models GR3, GR6 - range BC)
For normal pressure difference operation, the con-
nections are made to the High Pressure (HP) and
Low Pressure (LP) ports as appropriate. For single-
ended positive pressure operation, the HP only is
used and the LP is left open to atmosphere. The
single-ended negative pressure operation, the LP
only is used and the HP is left open to atmosphere.
Use a breather / filter in the vacant port of single-
ended operation.
Compound range eg –12.5 to +12.5 mbar
(Models GR3, GR6 - range BC)
For normal operation, negative pressure may be
applied to the LP port, whereby the HP port is left
open to atmosphere and the set point is between 0
and +12.5 mbar.
For reverse operation, negative pressure may be
applied to the HP port, whereby the LP port is left
open to atmosphere and the set point is between 0
and –12.5 mbar.
For positive pressures the opposite applies.
It is recommended that the minimum setting is to be
not less than 5% of FS either side approaching zero.
MAINTENANCE
Inspections should be carried out at quarterly to
yearly intervals depending upon operating condi-
tions.
Where a terminal enclosure is fitted, isolate the unit
from process and power and remove the lid. Check
all terminals for tightness. Check that cable tails are
not fouled or chafed. Check for internal condensa-
tion. Rectify as necessary.
It is recommended that instruments used to provide
an alarm are operated periodically to ensure they
are functioning correctly.
If further maintenance is required, seek advice from
DELTA MOBREY before attempting repair or re-
placement of parts.
Should the diaphragm fail the process will vent to
atmosphere via a control orifice without pressurising
the switch enclosure. Periodically ensure the vent
area does not become blocked and vent plug has
not degraded. Ensure that the vent area is not ob-
structed.
SPECIAL CONDITIONS FOR SAFE USE
For certificate number
Baseefa02ATEX0214X:
The permanently attached leads shall be suitably
protected
terminated in a suitable junction box or terminal
facility suitable for the conditions of use.
For certificate number
Baseefa06ATEX0091X:
1) The apparatus must be installed such that the
risk of impact or abrasion is negligible.
2) The permanently attached leads shall be suitably
protected
terminated in a suitable junction box or terminal
facility suitable with a minimum degree of
protection of at least IP6x.
3) The installation of external connections to models
of the apparatus with terminal enclosures must
be carried out using appropriate conduit or cable
gland with a degree of protection of at least IP6x,
Component
Certification Body
For certificate number
Baseefa03ATEX0089X:
1) Not more than 1 single or multiple lead shall be
connected into either side of any terminal
2) Leads to be
voltage. Insulation to extend to within 1mm of the
terminal throat.
3) All terminal screws used and unused to be
tightened down
4) Circuits to be protected by excess current
protection which shall operate within 4 hours a t
1.5 X the designed load current.
5) Al cable entries shall maintain IP66 minimum
6) Kwikstik 3507 inseal gasket must be fitted
between GR series adaptor and enclosure to
ensure IP66 ingress protection.
Note: When weatherproof junction box code 'C' is
fitted the unit must not be used in hazardous areas
unless the circuit or system to which it is connected
is Intrinsically Safe.
REPLACEMENT PARTS:
Use only factory authorised parts and the fitting
instructions that are supplied.
www.delta-mobrey.com
IOM-GR-B : SEPT 2019
against
mechanical
against
mechanical
Certified
by
an
insulated for the appropriate
damage
and
damage
and
EU
approved
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