WellMark 2001NB Series Leitfaden

The Company, L.L.C. Oklahoma City, Oklahoma Tel: (405) 672-6660 Fax: (405) 672-6661

wellmarkco.com

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.

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

Operation

The 2001NB Level Control utilizes a balanced method, whereby a

spring acting on a lever balances the weight of the displacer in the

vessel. As liquid rises in the vessel, force is made available via the

Torque Bar (16) and Fulcrum (26), to the pilot proportional to the

weight of the displaced liquid. As the liquid level rises the amount of

force increases to the pilot.

configuration, whereby rising level Pilot

output. When the unit is configured for Direct-Acting operation the

Fulcrum will be located either left or right of the pivot depending upon

whether the unit is Left Hand Mount or Right Hand Mount as

illustrated below.

configuration (rising level Pilot output)

can be accomplished by moving the Fulcrum to the opposite side as

shown below.

refers to the differential between ON and OFF.

This is determined by the position of the Fulcrum along the Torque

Bar.

Direct-Acting

Reverse-Acting

Span or Dump Span

increases

decreases

The Company, L.L.C. Oklahoma City, Oklahoma Tel: (405) 672-6660 Fax: (405) 672-6661

wellmarkco.com

2001NB

Series

REVERSE-ACTING

Rising level DECREASES Pilot output

FULCRUM

PIVOT PIVOT

FULCRUM

LEFT HAND MOUNT RIGHT HAND MOUNT

psi psipsi psi

DIRECT-ACTING

Rising level INCREASES Pilot output

FULCRUM PIVOT PIVOT FULCRUM

LEFT HAND MOUNT RIGHT HAND MOUNT

psi psi psipsi

Proportional Band, when referring to a throttling control, is the ratio

of displacer actually used as compared to the overall length of the

displacer. For instance, a 50% proportional band would utilize 6” of a

12”displacer to achieve a 3-to-15 psi output.

FULCRUM

PILOT

FLAPPER

BAR

The Dump Span and Proportional Band are adjusted by moving the

Fulcrum along the Flapper Bar as necessary to achieve the desired

result.

- The Displacer’s weight is held in balance by the

Spring (21). Since the Displacer is buoyant, as the level rises the

apparent weight or of the Displacer decreases. As a result of

Level Adjustment

mass

psipsi

SPRING

ADJUSTMENT ARM

Differential force increases

as Displacer is unweighted

Rotates down, relieving

pressure on Torque Bar

Displacer’s apparent weight

decreases as fluid level rises

FLAPPER BAR

FULCRUM

PILOT

TORQUE

BAR

the rising Displacer the Adjusting Bar rotates, relieving pressure on

the Torque Bar. This results in an increase in differential Spring

force, transmitting that force to the Pilot poppet via the Fulcrum and

Flapper Bar. Increasing tension on the Spring lowers the sensed

level. Conversely, decreasing the spring force raises the sensed

level.

Some systems require control at the interface distinction between the

hydrocarbon and water. This is referred to as . It

is possible to adjust the Spring to a point at which the hydrocarbon

liquid completely envelopes the displacer without transmitting

enough force to engage the pilot and produce any output.

Water has a higher specific gravity than hydrocarbon and naturally

separates lower, with hydrocarbon liquid rising above it. When

properly adjusted, water can rise to a level on the displacer, changing

its apparent weight and causing enough force to engage the pilot,

which will then result in output. The 2001NB unit’s broad range of

control allows liquid interface sensing.

Interface Operation

interface operation

The Company, L.L.C. Oklahoma City, Oklahoma Tel: (405) 672-6660 Fax: (405) 672-6661

wellmarkco.com

2001NB

Series

Pilot Operation

IMPORTANT!

Snap-Acting Pilot • No-Bleed On/Off FlowAction

Throttle Pilot • No-Bleed Modulating FlowAction

Although the 2001NB Level Control is appropriately referred to

as , all pneumatic systems require that the

diaphragm operated motor valve exhausts or pressure off

the diaphragm once the valve has completed its actuation cycle.

This vented gas, along with the gas within the lines leading from

the control to the valve will vent back through the control. This

clear distinction, between gas and gas must be

made and understood. As with any or control, the

intent is to stop the unnecessary bleed of gas between valve

actuation cycles. The 2001NB Level Control will accomplish

this task. It will not however, nor will any other or

device stop the required venting of gas from the diaphragm and

lines once the valve has cycled.

The Snap-Acting Pilot is comprised of two inner valves. Valve (1)

admits system supply gas to output. Valve (2) controls system

exhaust from output. Valve (1), as shown in the closed position (Fig.

1), is held closed by force exerted from supply gas. When upward

Flapper Bar forces transferred to Valve (2) is sufficient enough to

overcome supply force, the ball snaps upward, allowing supply

pressure to communicate to output port, which operates the

diaphragm motor valve (not shown). The spherical end of Valve (2)

closes the exhaust port the instant the ball snaps upward and

remains seated against supply pressure until force on the valve

diminishes. As force is removed from Valve (2), causing it to unseat,

a simultaneous action occurs, causing Valve (1) to seat instantly,

closing the supply port to ouput and opening output to exhaust,

thereby allowing the diaphragm motor valve to reverse it’s action.

The Throttle Pilot utilizes a diaphragm, which creates a forced

balance Pilot (Fig. 2). Output pressure acts upon the diaphragm

causing it to push back at the same force being applied to the lower

seat. More force on the seat produces a proportionate increase in

Pilot pressure. When the Flapper Bar of the control exerts upward

force on the lower valve seat, it forces the lower seat closed against

valve body and opens the supply valve. Supply pressure enters the

system, increasing until the control and diaphragm motor valve (not

shown) pressure equals the Flapper Bar force and produces a forced

system balance. The control will stay in this position until a decrease

in the tank level reduces the force allowing exhaust, or an increase in

the level produces an action as described. System supply gas does

not flow while the Pilot is in balance.

“No-Bleed”

vents

“bleed” “vent”

no- low-bleed

The 2001NB Level Control has a sealed box which allows the user to pipe vent gas

away from the facility as needed. This is highly recommended if the control is to

be mounted inside an enclosure that might result in a dangerous build up of gas.

Failure to do so may result in damage to equipment, personal injury or death.

!CAUTION!

SUPPLY

OUTPUT

Startup

Assure free-travel of the Displacer and Displacer Arm by rocking the

Torque Bar by hand and observing corresponding movement of

Displacer. The Displacer Arm should be centered in the vessel

nozzle to assure that the vessel nozzle does not inhibit free

operation. Displacer Arm should be parallel to the ground at

installation.

The controller is factory-set for average level and sensitivity.

- Increase the compression of the Spring by

turning theAdjustment Wheel to the

LEVELADJUSTMENT

To DECREASE LEVEL

RIGHT.

SETTING INTERFACE LEVEL

NOTE: The

presence of foam in the interface zone may affect the accuracy

of the control.

The controller is factory-set for average level and sensitivity.

Generally speaking, interface operation is most successful when

there is a substantial differential in specific gravity between the two

liquids. Interface cannot be reliably achieved with a displacer-type

control with specific gravity differentials less than 0.1. Also, the

sensitivity of the interface control is increased by the size of the

displacer. Therefore, it is usually advantageous to use the largest

displacer available, which will fit into the vessel.

The Company, L.L.C. Oklahoma City, Oklahoma Tel: (405) 672-6660 Fax: (405) 672-6661

wellmarkco.com

2001NB

Series

psipsi

DECREASE LEVEL

by increasing Spring compression

ADJUSTMENT WHEEL

SPRING

RIGHT

psipsi

ADJUSTMENT WHEEL

SPRING

psipsi

INCREASE LEVEL

by decreasing Spring compression

ADJUSTMENT WHEEL

SPRING

LEFT

To INCREASE LEVEL -

LEFT.

Decrease Spring compression by turning

theAdjusting Wheel to the

ADJUSTING PROPORTIONAL BAND (SPAN)

To DECREASE BAND

(Increase Sensitivity)

Loosen Thumbscrew on Fulcrum and position the Fulcrum along the

Flapper Bar.

Slide Fulcrum along

Flapper Bar toward

Snap Ring.

FULCRUM

PILOT

FLAPPER

BAR

SNAP

RING

FULCRUM

PILOT

FLAPPER

BAR

SNAP

RING

To INCREASE BAND

(decrease Sensitivity)

Slide Fulcrum along

Flapper Bar away from

Snap Ring.

Once desired band/span is achieved re-tighten Thumbscrew.

FULCRUM

PIVOT

PILOT

FLAPPER

BAR

1”

1. Set Fulcrum approx. 1/2” from

pivot pin.

Reduce Spring tension slowly by

turning the Adjusting Wheel to the

Allow the upper fluid to rise until

it completely submerges the Displacer.

LEFT.

Next, fine-tune the adjustment by turning the Adjusting Wheel to

the until an output signal is attained.

Finally, turn theAdjusting Wheel back to the until the output

signal returns to

2. Allow the lower liquid to rise until the desired interface level is

attained. Fine tune by slowly turning the Adjusting Wheel to the

until an output signal is obtained. Finally, slowly turn the

Adjusting Wheel to the until the output signal returns to

ZERO.

3. To obtain a shorter dump span, slide the Fulcrum away from the

pivot and repeat the above procedure.

RIGHT

LEFT

ZERO.

RIGHT

LEFT

Maintenance

The 2001NB Level Control is designed to provide years of reliable

service. However, build up of debris, paraffin, etc inside the

controller Body can interfere with proper functioning. A regular

maintenance program should include checking for this condition.

Prior to maintenance 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!

The Company, L.L.C. Oklahoma City, Oklahoma Tel: (405) 672-6660 Fax: (405) 672-6661

wellmarkco.com

2001NB

Series

Maintenance- continued

Note: This procedure does not include removal or servicing of the

Pilot. Refer to section elsewhere on this page for information

specific to removal of Pilot. Also, for reference see Sectional

Diagram and Parts List on Page 6.

Relax compression on Spring (21) and remove along with the Upper

Guide (22). Remove the Stud (19) and Adjustment Wheel (20).

Remove Nyloc Nut (28) from Stud (23) and slide the Flapper Bar (24)

off Stud. DO NOT REMOVE THE STUD, as it is press-fit into the

Control Box. Fulcrum (26) and Thumbscrew (27) should remain in

place on the Flapper Bar.

Remove a second Nyloc Nut (28) from the Pivot Shaft (6) and slide

Torque Bar off the Pivot Shaft (6).

Hold the Adjusting Bar (14) while loosening two Capscrews (15).

Once Adjusting Bar is loose, remove it along with the Adjusting

Screw (17) from the Pivot Shaft. The Adjusting Screw need not be

removed from theAdjusting Bar.

Remove two Capscrews (12) holding the Control Box (1) to the Body

(5) and disassemble Control Box from Body.

Mount the Control Box to the Body using the two Capscrews. Screws

should be tightened to 6 ft-lbs.

Install the Spacer on the Pivot Shaft.

If the Adjusting Screw was removed from the Adjusting Bar during

disassembly it should be refitted, threading it into the Adjusting Bar

until an equal amount of threads is showing above and below the

Adjusting Bar.

Slide theAdjusting Bar onto the Pivot Shaft, against the Spacer, such

that the portion through which the Adjustment Screw is installed is on

the opposite side from the Body (see below).

General Disassembly

General Reassembly

Slide the Spacer (11) from the Pivot

Shaft.

Temporarily install the Torque Bar onto the Pivot Shaft. Position the

Level Adjusting Bar and Adjusting Screw such that the Torque Bar is

parallel with the Displacer Arm (30) when the tip of the Adjusting

Screw is touching the bottom of the Torque Bar.

Remove the Torque Bar, being careful not to disturb the position of

the Adjusting Bar, and fully tighten the two Capscrews securing the

Adjusting Bar to the Pivot Shaft. DO NOT OVERTIGHTEN.

Slide the Torque Bar back in place with the hole for the Upper Guide

oriented on bottom and in proper position to accept the Upper Guide

once the Spring is re-installed. Secure the Torque Bar with the Nyloc

Nut, leaving approx. 1/16” clearance between the bottom of the nut

and the Torque Bar.

Slide the Flapper Bar back onto the Stud and secure with the other

Nyloc Nut. IMPORTANT! Do not over-tighten this nut, as the

Flapper Bar must be able to move freely on the Stud.

Re-install the Stud and Adjusting Wheel. Install the Spring and

Upper Guide, engaging the extrusion on the Upper Guide into its

mating hole on the bottom of the Torque Bar.

IMPORTANT! The Torque Bar must be able

to move freely on the Pivot Arm. Tightening the Nyloc Nut too

much will inhibit this free travel.

Pilot Removal/Replacement

The Pilot (4) is held in place by the Pilot Clamp (36) and four

Capscrews (35). Remove the Capscrews, Pilot Clamp and Pilot from

the Control Box. Inspect condition of Gasket (34) and replace if

necessry.

Re-install the Pilot, assuring that the Gasket is seated properly with

port holes aligned with ports in Pilot and Control Box.

Remove the Body from the Control Box as described in the

section.

Remove the two Shaft Retainers (9) utilizing a 1-1/8” wrench.

Remove the Pivot Shaft (6). Remove the Pivot Shaft O-Rings (7),

Back-up Rings (8) and Shaft Retainer O-Rings (10) and discard.

Body Disassembly

General

Disassembly

Prior to removing Pilot system must be isolated from

pressure. Failure to do so may result in personal

injury, environmental spill concerns and/or damage

to equipment.

CAUTION! If the Shaft Retainers (9) are removed, O-Rings (7

and 10) and Back-up Rings (8) MUST BE REPLACED.

Snug, but the two Capscrews that hold the Adjusting

Bar to the Pivot Shaft.

do not tighten

psipsi

BODY

CAPSCREWS

ADJUSTMENT

BAR

on opposite side from BODY

WARNING!

The Company, L.L.C. Oklahoma City, Oklahoma Tel: (405) 672-6660 Fax: (405) 672-6661

wellmarkco.com

2001NB

Series

Item Description Qty. Part Number

25 TRU-ARC RING 1 06000-1385

26 FULCRUM, Aluminum 1 05011-4412

27 THUMBSCREW, SS/Plastic 1 06500-5429

28 NYLOC NUT, SS 2 05000-2567

29 ACORN NUT, SS 1 05000-2575

30 DISPLACER ARM - STD., SS 1 06000-1534

30 DISPLACER ARM - VF, SS 1 05011-9296

31 DISPLACER BUSHING, SS 1 06000-5105

32 DISPLACER - STD., PVC 1 05012-3561

33 HINGE PIN, Plated CS 2 06000-7537

34 GASKET, Neoprene 1 06000-4819

35 CAPSCREW, SS 4 05000-5313

36 PILOT CLAMP, SS 1 05012-6325

37 PANEL SCREW, SS 1 06000-1153

38 RETAINER, SS 1 06000-2672

39 SERIAL TAG, Aluminum (not shown) 1 06000-1922

40 THREAD SEAL, Steel/Buna N 1 06000-0395

41 O-RING, Viton® 1 05000-5586

42 BEARING, SS 2 06000-7552

43 TOLERANCE RING, SS 2 06000-7560

44 ADAPTER, VERT. DWN ASSY., SS 1 06500-4350

45 COVER GLASS, Lexan® (not shown) 2 10916

46 COVER GLASS PLATE, SS (not shown) 2 10915

47 COVER GLASS GSKT, Neoprene (not shown) 2 10917

48 SCREW, Plated Steel (not shown) 8 001501P

Item Description Qty. Part Number

1 CONTROL BOX, Die Cast Aluminum 1 05012-4841

2 COVER, Die Cast Aluminum 1 05012-4834

3 BOX SEAL, Neoprene 1 06000-5097

4 SNAP PILOT ASSY., Aluminum & SS 1 06500-5304

4 THROTTLE PILOT ASSY., Aluminum & SS 1 06500-5387

5 BODY, CS 1 05011-4560

6 PIVOT SHAFT, SS 1 05011-4511

7 O-RING, Viton® 2 05000-0769

8 BACK-UP RING, Teflon® 2 06000-1179

9 SHAFT RETAINER, SS 2 05012-9389

10 O-RING, Viton® 2 05000-1155

11 SPACER, SS 1 05011-4495

12 CAPSCREW, SS 2 05000-5578

13 CAPSCREW, SS 1 05000-5453

14 ADJUSTING BAR, Aluminum 1 05011-4438

15 CAPSCREW, SS 2 05000-2526

16 TORQUE BAR, Aluminum 1 05011-4545

17 ADJUSTING SCREW, SS 1 05011-4537

18 JAM NUT, SS 1 05000-2559

19 STUD, SS 1 05011-4552

20 ADJUSTMENT WHEEL, Aluminum 1 05011-4529

21 SPRING, SS 1 06000-4157

22 UPPER GUIDE, Aluminum 1 05011-4479

23 STUD, FLAPPER BAR, SS 2 05012-9371

24 FLAPPER BAR, SS 1 05011-4404

The Bearings (42) and Tolerance Rings (43) need not be removed

from the Shaft Retainers unless they are damaged and must be

replaced.

Parts List

BACK-UP RING (8)

SHAFT RETAINER (9)

O-RING (7)

Body Reassembly

Lightly lubricate new O-Rings and Back-

Up Rings with oil. Install Pivot Shaft

Back-Up Ring into Shaft Retainers first,

with O-Ring next. IMPORTANT! The

Back-Up Ring MUST be outboard of

the O-Ring,as illustrated.

Thread the Shaft Retainer into the Body.

Insert the Pivot Shaft into the Body from the inboard side, seating it

firmly into the Bearing in the Shaft Retainer on the side

Re-install the remaining Shaft Retainer over the Pivot Shaft and

threaded into the side of the Body. Tighten both Shaft

Retainers firmly.

Re-attach the assembled Body to the Control Box as described in the

section.

outboard

inboard

General Reassembly

SUPPLY OUTPUT

030

255

10 15 20

030

255

10 15 20

40 13 15 29 19 20

23 30 31 32

539 10

11 67

28 Vertical Displacer

Assembly

Horizontal Displacer

Assembly

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