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© The WellMark Company • Litho USA • All registered trademarks are the property of their respective owners. • IOM-2001NB 091007
Specifications
Connections
Process 2” MNPT Std. (Others avaialble)
Pilot 1/4” FNPT
Case Exhaust 1/8” FNPT
Output
Throttle (Proportional) 3-15 psig or 6-30 psig
Snap-Acting 0 to Full Supply
General
Repeatability 1.0% of Full Scale
Dead Band 5.0% of Input Scale
Linearity 2.0% of Full Scale
Ambient Temp. Effect 1.0% @ -40°F
3.0% @ +180°F
Specific Gravity 0.4 Minimum
Temp. Limits -40°F to +200°F
(Displacer is limiting factor)
Pressure Rating 6000 psi
Pilot Operating Pressure Normal: 20-35 psi
Overpressure Protection: Gauges are the limiting factor.
Maximum Pressure without Gauges 125 psig
Over-pressure of this control or installation of the
control in applications which may see pressure
levels beyond those for which the control is
designed may result in leakage and/or catastrophic
failure. This failure could result in leaking gas, or
produced liquid, damage to surrounding equipment
and/or environment, personal injury or death.
Suitable pressure-relieving devices, as
recommended by appropriate codes or standards,
should be installed in your system to assure that
maximum rated pressures are not exceeded.
1
WARNING!
2001NB
Series
Application
VesselInstallation
The Series 2001NB Pneumatic Level Control is designed for use in
liquid level and interface liquid control applications. The unit is
available in either Snap-Acting or Throttling configuration and is field
reversible for either Left-hand or Right-hand orientation.
Furthermore, the unit can be set up for Direct or Reversing Acting
operation. This standard displacer is 1-7/8” x 12” PVC in horizontal
configuration. Displacers of other materials and dimensions, as well
as Vertical Displacers are optionally available.
Insure that threaded connections on both the 2001NB and the vessel
are clean, free of debris and undamaged prior to installing. Install the
Displacer (32) onto the Displacer Arm (30) by threading it together
(Note: the Displacer Bushing (31) should already be installed in the
Displacer). If the unit is configured for Vertical Displacer Assemby,
theAdapter (44) will already be attached to the DisplacerArm. In this
case, install the Displacer by threading it onto the Adapter. Snug all
threaded connections firmly.
Install the Control in the vessel. Connect instrument supply line to
SUPPLY port on back. Connect control valve signal line to OUTPUT
port on back. Use a suitable thread sealant to assure leak-tight make
up and to avoid thread galling. Do not overtighten.
CAUTION!
Maximum allowable pressures for this level control are
determined by the rating of the connection. Threaded
connections are rated to 6000 psi @ 100°F. Flanged
connections are subject to the maximum ratings as specified by
ASME B16.5 for specific pressure classes and temperatures.
These pressures should not be exceeded and proper over-
pressure protection should be employed on vessels where
pressures above maximum may occur. Likewise, displacer
material and configuration should be considered when
determining suitability for a particular application.
Prior to installation of the 2001NB Level Control
system must be isolated from pressure. Failure to
do so may result in personal injury, environmental
spill concerns and/or damage to equipment.
WARNING!
Note: This document is to be used in conjunction
with WellMark Catalog Document, Section No.
3.1, “Series 2001NB Pneumatic Level Control”,
pages 1 through 3.
Installation, Operation & Maintenance Instructions
for Series 2001NB Pneumatic Level Control
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