Metek DREXELBROOK Universal IV Lite, Installation And Operating Instructions Manual

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Installation
13
FLEXIBLE
BOTTOM
ANCHOR
PART# 727-XX-X
CUSTOMER
SUPPLIED
SUPPORT
RECOMMENDED FLEXIBLE
SENSOR INSTALLATION
FLEXIBLE
CABLE TYPE
SENSOR
ROD
STYLE
SENSOR
CUSTOMER
SUPPLIED
SUPPORT
BRACKET
INSULATED
SUPPORT
BUSHINGS
PART # 713-XX-X
RECOMMENDED RIGID
SENSOR INSTALLATION
AVOID WEIGHTED
FLEXIBLE SENSORS IN
AGITATED VESSELS
Figure 2-5
Installing Sensing
Element
in Agitated Vessel
Figure 2-6
Providing Ground
Reference*
*This is a sensing
element ground
reference and possibly
different from an
electrical power
ground.
GROUND
CLAMP
PLASTIC
TANK
SENSOR
A B
C CLAMP
CLAMP
E
D
WEIGHT
PUMP
F
RUN 14 AWG. WIRE FROM FABRICATED
GROUND TO GREEN SENSOR GROUND
SCREW
METAL
C
MOUNT SENSOR IN METAL PIPE
Mounting the level sensor inside a metal
pipe provides an excellent ground
reference.
Use only if the process material is
greater than 1000 uMHOS/cm such as acids
and caustic.
A
GROUND ROD
A ground rod can be fabricated out of any
metal compatible with the process. Use
material that is at least 3/8inch dia. such as
pipe, All-Thread, or tubing. The ground rod
must be parallel and relatively close to the
sensor for insulating and low conductivity
materials.
B
GROUND WIRE
1/4 inch or larger dia. stainless steel rope
that is anchored or weighted can be used.
E
SUBMERGED METAL STRUCTURE
Use any constantly submerged metal
object such as: pumps, agitators, or
thermowells.
F
METAL FLANGE
A submerged metal flange or orifice plate
can be used.
Use only if the process material is greater
thatn 1000 uMHOS/Cm. such as acids and
caustic.
D
METAL PIPING
Metal piping that connects to the tank
bottom can be used as a ground
reference.
Use only if the process material
is greter than 1000 uMHOS/cm such as
acids and caustic.
If the vessel is non metallic see grounding sketch below. sensors
with factory supplied concentric shield or ground rod do not need
additional grounding.
In metal vessels measure continuity from housing ground screw to
metal wall of vessel. A good ground will measure less than 5 ohms.
Ground element must be equal to or below the bottom of the
sensing element
2.3 Mounting the Electronic Unit (Continued)