Emerson Enardo 850 Series User Manual

Zone 0: II 1 G c T5
Ex ia IIC T5 Ga
Zone 1: I 2 G c T5
Ex ia IIC T5 Gb
14
850 and 950 Series
North America Only
12. For seat replacement, the seats are installed in
the reverse order of the removal. Make sure the
bores are clean and that the O-ring seals are not
damaged. If necessary, use a light lubricant in
replacing seats.
Smart Wireless Monitoring Maintenace
1. Maintain Wireless Models 850 and 950 PVRVs
in the same way as all standard Models 850 and
950 PVRVs. Clean the pallet and seat sealing
surfaces, remove any buildup of residues on the
weights and ensure any screens are not blocked.
2. Take certain precautions when cleaning the
transmitter. The surface resistivity of the antenna
assembly when the optional transmitter is installed
is greater than 1 GΩ. To avoid electrostatic charge
build-up, it must not be rubbed or cleaned with
solvents or dry cloth.
The overall ATEX rating for all Wireless Models 850
and 950 valves are listed below:
Adjustments
The Enardo™ pressure/vacuum relief valves have
wide range of pressure and vacuum settings in units
of ounces per square inch (oz./sq.in.) or inches of
water column (in. w.c.) as indicated in the specication
section of this instruction manual. Standard Enardo
valve pallets assemblies are marked with a minimum
equivalent pressure value in the specied units.
Installed alone has minimum settings of 1/2 oz./sq. in.
or 1 in. w.c. The pallets are calibrated by the seal
support located on the bottom side of the pallet. The
pallet’s setting of 1/2 oz./sq.in. or 1 in. w.c. is etched into
the support. When a valve requires a setting higher than
the 1/2 oz./sq.in. or 1 in. w.c. standard pallet setting,
use weights to increase the pallet’s setting up to the
required setting.
Additional calibration weights are marked with their
equivalent pressure value and should be added as
necessary to achieve the specied setting.
Enardo weights also come in units of ounces per
square inch (oz./sq.in.) or inches of water column
(in. w.c.). The individual setting of each weight is either
etched or imprinted into the weight. Emerson o󰀨ers
several di󰀨erent sizes of pressure/vacuum relief valves.
To ensure that the right weight is placed on the right
pallet, take note that the weights and pallets that go
together will have the same outside diameter. Standard
Enardo weights allow the user to stack in increments of
1/2 oz./sq.in. or 1/2 in. w.c.
Pressure/vacuum relief valve is shipped with
prepackaged weight kits to set the valve pressure
properly. The package labelled “pressure” is for the
pallet in the pressure chamber, while the package
labelled “vacuum” is for the pallet in the vacuum
chamber. All weights in these packages should be
installed. If one or neither of these packages is included
with your order, then they are not needed.
Figure 12. Weights on Pallet

Emerson Enardo 850 Series Specifications

General

Brand	Emerson
Model	Enardo 850 Series
Category	Control Unit
Language	English