Kobold NBK - WJF Instrumentation
NBK
BYPASS LEVEL GAUGES
Flow
Pressure
Level
Temperature
measurement
monitoring
control
N2
● KOBOLD Circular Magnet System
Effective from All Sides
● 1450 PSIG Maximum Pressure
● Temperature to 750°F
● Remote Transmission Capability
● Limit Switches Available
● Industrial Ruggedness
USA
CANADA
KOBOLD Instruments Inc.
1801 Parkway View Drive
USA- Pittsburgh, PA 15205
☎ +1 412-7 88 - 28 30
Fax +1 412-7 88 - 48 90
E-mail: info@koboldusa.com
KOBOLD Instruments Canada Inc.
9A Aviation
Pointe-Claire, QC H9R 4Z2
☎ +1 514-428-8090
Fax +1 514-428-8899
E-mail: kobold@kobold.ca
Visit KOBOLD Online at
www.kobold.com
Model:
NBK
393
NBK - Bypass Level Gauges
KOBOLD bypass level gauges are used
in applications requiring continuous
measurement, indication and control of
liquid levels. Any medium with viscosity
less than 200 cPs is a candidate.
KOBOLD’s bypass design relies on the
hydrostatic pressure principle to display
tank level in a side mounted measuring
chamber. A float, containing a ring
magnet, rises and falls with the liquid
level in the bypass tube. This approach
allows an all metal construction which
eliminates the breakage and leakage
problems frequently experienced with
glass tube designs. Transmission, visual
indication, or switching may be achieved
by mounting magnetically sensitive
devices on the exterior of the bypass tube.
These devices track, or are activated by,
the magnet inside the float.
The following devices are available with
KOBOLD’s bypass level gauges:
● Magnetic Indicators: An assembly of
rollers may be mounted on the side of
the gauge body. These rollers contain
small bar magnets and are free to
rotate about their axes. Passage of
the level following float causes them
to be rotated 180°. Since the
indicators are white on one side, and
red on the other, the location of the
gauge’s internal float, and liquid level, is
clearly shown by the red to white
transition area of the indicator
assembly.
● Level Transducer: If data transmission
is required, a signal can be generated
with the aid of a resistive reed contact
chain mounted on the outside of the
bypass pipe. Using a separately
mounted control element, a continuous
0–20 mA, 4–20 mA or 0-10 VDC signal
is produced. Additionally, an integrally
mounted 4-20 mA transmitter is
available.
● Switches: Reed contacts may be
mounted on the bypass pipe to monitor
or control liquid levels. The magnet
inside the float serves as the switch
actuator.
Bypass Pipe
The bypass pipe (sometimes called the
standpipe) is constructed of 316-Ti
stainless steel. Depending on local
conditions, the bypass pipe will be
connected to the side of the tank with
either flanges or NPT fittings.
Individual bypass gauges are available
in single unit lengths to 19.7 feet
(6 meters.) Longer versions are possible
by delivering the gauge in two or more
sections.
Max. Pressure:
1450 PSIG
Temperature Range: – 58 °F to + 750 °F
(– 50 °C to + 400 °C)
394
Subject to change without prior notice.
NBK - Bypass Level Gauges
Cylindrical Floats
The unique float design developed for the
KOBOLD NBK series is the key to this
level indicating system’s versatility. The
float contains a permanent magnet which
is specially designed to project a uniform
magnetic field 360˚ around the float. This
means that the magnetic roller indicators,
switches and analog transducers can be
placed anywhere on the periphery of the
bypass pipe.
For the NBK-0300 series and NBK-0600
series, the standard floats are made of
316-Ti stainless steel. Optional floats are
available in titanium for low specific gravity
liquids. All floats for the high pressure
NBK-0700 and NBK-1000 series are made
of titanium.
Stainless Steel Floats
The standard floats for the NBK-0300 and
NBK-0600 series are made of 316-Ti
stainless steel and used with liquid
specific gravities down to 0.8. They are
hermetically sealed and completely liquid
and gas tight.
Titanium Floats
An optional titanium float is available for
NBK-0300 and NBK-0600 series to be
used with liquids which have a specific
gravity lower than 0.8. The titanium float
can be used with liquid specific gravities
between 0.54 and 0.79. Titanium floats are
standard for the high pressure NBK-0700
and NBK-1000 series and can be used
with liquid specific gravities above 0.54.
Magnetic Indicators
For local level indications, a magnetic roller
indicator can be mounted on the bypass
pipe. As the float rises past the indicator
assembly, its ring shaped magnetic field
rotates the individual indicator elements
from their white, to their red sides. The
large contrast produced by use of these
two colors allows easy reading of the level
even from a distance.
N2
The standard polypropylene rollers may be
used with media temperatures to 212˚F.
For applications to 750˚F, ceramic roller
assemblies are used. the entire assembly
is highly resistant to vibration due to the
stabilizing effect of the individual magnets
in each indicator element. This makes the
KOBOLD bypass gauge a good choice for
a wide variety of level indicating
applications.
Diameter
(inches)
Length
(inches)
580 PSIG
2.05
10.67
0.8
230 PSIG
2.05
11.81
0.54
Standard Titanium Float
for NBK-07
930 PSIG
2.05
8.85
0.8
Low Specific Gravity
Titanium Float for
NBK-06 & NBK-07, Option-T7
930 PSIG
2.05
18.50
0.54
1450 PSIG
2.05
12.80
0.8
1450 PSIG
2.05
28.35
0.54
Float Type
Standard Stainless Steel
for NBK-03 & NBK-06
Low Specific Gravity
Titanium Float for
NBK-03, Option-T3
Standard Titanium Float
for NBK-10
Low Specific Gravity
Titanium Float for
NBK-10, Option-T10
Subject to change without prior notice.
Maximum
Pressure
Minimum Liquid
Specific Gravity
395
NBK - Bypass Level Gauges
Transducer
Level transmission can be provided in
addition to, or in place of, visual local
indication. This is done by locating a reed
chain transducer outside the bypass pipe
(NBK Option W or WHT).
The transducer is located inside a
stainless steel tube which is clamped to
the bypass pipe. It is composed of a series
of reed switches connected by resistors.
As the float in the bypass tube moves,
reed contacts near its location
are closed, altering the resistance seen
on the chain’s terminals. This system
allows continuous level measurement in
0.4" (10 mm) increments.
A separate electronics module converts
the resistance to a current, voltage, or
relay output. The three-wire bridge
resistance design of the
transducer allows separation of the
electronics and the transducer by
distances exceeding one mile. See the
DFM, DST or DFA series for details.
Additionally, an integrally mounted, 2-wire
4-20 mA transmitter can be provided in
lieu of the external controllers
(NBK Option RT).
Construction:
Resolution:
Wiring:
Terminal Box:
316-Ti SS
0.4" (10 mm)
3-wire, any length
Aluminum
64 ×58 ×35 mm
NEMA 4
Remote Level Indication
For operation of the remote level
transducer, one of the following
Indicators/Controllers can be used.
Limit Switches
Bistable limit switches may be clamped
to the exterior of the bypass pipe to
provide alarm functions. These switches
are SPDT reed switches, so they can be
wired in either normally-open or
normally-closed configurations.
The switches work as follows: As the
float passes the reed switch, its magnet
actuates the reed switch. The switch
remains actuated until the float returns and
passes it a second time (traveling in the
reverse direction as previously.)
As many switches as desired may be
used. Switches may be placed anywhere
on the exterior of the bypass tube. The
minimum distance between switches is
approximately 1 inch.
Switch:
SPDT, bistable
220 VAC max.
0.5 A max.
60 VA max.
0.6"
Hysteresis:
Housing
Switch R:
Nylon
Switch RH & RHH: Aluminum
Environment
Max. Temperature:
Protection:
Max. Temperature:
Switch R:
Switch RH:
Switch RHH:
up to 750 °F
NEMA 4X/IP65
250˚F
392˚F
750˚F
0(4)–20 mA, 0-5 or
0-10 VDC
Hazardous Zone Protection
All metal Kobold bypass level indicators
are suitable for application in hazardous
areas. To operate the level transducer or
the limit switches in a hazardous area,
intrinsically safe barriers must be used.
0(4)–20 mA, 0-5 or
0-10 VDC
Two adjustable limit switches
If unsure of your requirements, call your
KOBOLD representative.
● Model DFM
Output:
● Model DST
Output:
● Model DFA
Output:
Analog
Indicator:
0(4)–20 mA, 0-5 or
0-10 VDC
0–100 %
Two adjustable limit switches
396
EX
Subject to change without prior notice.
NBK - Bypass Level Gauges
Note 1: Dimension is for specific gravity = 1.0.
Floats for lighter liquids can increase this dimension.
Note 1: Dimension is for specific gravity = 1.0.
Floats for lighter liquids can increase this dimension.
12.60” (Note 1)
12.60” (Note 1)
N2
NBK-0300
NBK-0600
Technical Data
Bypass Pipe:
Gasket:
Fittings
Flanges:
NBK-0300:
316-Ti SS,
PTFE
NBK-0600:
Threads:
Length
Single Section:
Multiple Sections:
Maximum Pressure
NBK-0300
NPT Threaded:
Flanged:
150LB ANSI,
316 SS
300LB ANSI,
316 SS
NPT Male
19.7 feet max.
As desired
230 PSIG
Per ANSI B16.5
for class 150 to
230 PSIG Max.
Subject to change without prior notice.
Maximum Pressure (continued)...
NBK-0600
NPT Threaded: 580 PSIG
Flanged:
Per ANSI B16.5
for class 300 to
580 PSIG Max.
Allowable Media Temperature
Standard:
– 58 °F to + 750 °F
With Options . . .
Ri:
– 58 °F to + 250°F
RHi:
– 58 °F to + 392°F
RHHi:
– 58 °F to + 750°F
RP:
– 58 °F to + 212°F
RK:
– 50 °F to + 750°F
W:
– 58 °F to + 390°F
WHT:
– 58 °F to + 750°F
Cylindrical Float
Material:
316-Ti stainless steel or
titanium see Table 1 for
float material and
dimensions
397
NBK - Bypass Level Gauges
Note 1: Dimension is for specific gravity = 1.0.
Floats for lighter liquids can increase this dimension.
13.0” (Note 1)
13.0” (Note 1)
Note 1: Dimension is for specific gravity = 1.0.
Floats for lighter liquids can increase this dimension.
NBK-0700
NBK-1000
Technical Data
Bypass Pipe:
Gasket:
Fittings
Flanges:
NBK-0700:
NBK-1000:
Threads:
Length:
Maximum Pressure
NBK-0700
NPT Threaded:
Flanged:
398
316-Ti SS,
PTFE
600LB ANSI,
316 SS
900LB ANSI,
316 SS
NPT Male
19.7 feet max.
930 PSIG
Per ANSI B16.5
for class 600 to
930 PSIG Max.
NBK-1000
NPT Threaded:
Flanged:
1450 PSIG
Per ANSI B16.5
for class 900 to
1450 PSIG Max.
Allowable Media Temperature
Standard:
– 58 °F to + 750 °F
With Options . . .
Ri:
– 58 °F to + 250°F
RHi:
– 58 °F to + 392°F
RHHi:
– 58 °F to + 750°F
RP:
– 58 °F to + 212°F
RK:
– 50 °F to + 750°F
W:
– 58 °F to + 390°F
WHT:
– 58 °F to + 750°F
Cylindrical Float
Material:
Titanium see Table 1 for
float material and
dimensions
Subject to change without prior notice.
NBK - Bypass Level Gauges
NBK Ordering Information
NBK-
XX = Pressure Rating
Y = Fitting Style
Z = Fitting Size
XX = 03:
230 PSIG Max.
Y = 1: Stainless Steel DIN Flange
Z = 1: 1/2" (DIN: 15 mm)
XX = 06:
580 PSIG Max.
Y = 3: bsp Threads
Z = 2: 3/4" (DIN: 20 mm)
XX = 07:
930 PSIG Max.
Y = 4: Stainless Steel ANSI Flange
Z = 3: 1" (DIN: 25 mm)
Y = 6: NPT Threads
Z = 4: 11/4" (DIN 32 mm)
Z = 5: 11/2" (DIN 40 mm)
XX = 10: 1450 PSIG Max.
Z = 6: 2” (DIN 50 mm)
NBK Option Information
Part Number
Suffix
Description
N2
-RP
Polypropylene Magnetic Indicating Roller Assembly. Operating Temperature Range: – 58 °F to + 212 °F
-RK
Ceramic Magnetic Indicating Roller Assembly. Operating Temperature Range: – 58 °F to + 750 °F
-Ri
Adjustable Reed Contact Limit Switch. Process Temperature: – 10 to 250 °F. Ambient Temperature: – 10 to 160 °F
i = number of switches desired. Example: Two reed switches = »-R2«.
-RHi
High Temperature Reed Switch. Process Temperature: – 10 to 392 °F. Ambient Temperature: – 10 to 160 °F
-RHHi
Very High Temperature Reed Switch. Process Temperature: – 10 to 750 °F. Ambient Temperature: – 10 to 160 °F
-W
Analog Level Transducer. Kobold Transmitter must be used to produce 0(4)–20 mA signal. Process Temp.: – 58 to 390 °F
-WHT
High temperature analog level transducer. Process Temperature: – 58 to 750 °F
-RT
2-wire 4-20 mA Integral Transmitter, Requires Option W or WHT
-A
Connecting Flanges for two part design (Models NBK-0300 & NBK-0600 only).
-F
Drain Valve. 1/2" NPT. 316-Ti Stainless Steel. 400 °F Max. at atmospheric pressure
-J
Top and Bottom Cleanout Flanges
-S
Level Measuring Scale
-T3
Low Specific Gravity to Titanium Float for NBK-0300, 0.54–0.79 Specific gravity
-T7
Low Specific Gravity to Titanium Float for NBK-0600 & NBK-0700, 0.54-0.79 Specific gravity
-T10
Low Specific Gravity Titanium Float for NBK-1000 , 0.54-0.79 Specific gravity
Example Order
Kobold’s bypass level gauges are
customized to your specific application.
Our part numbering system is designed
to make the process of specifying a gauge
as easy as possible. To help you create
the part number for the bypass gauge you
need, an example is given below:
Assume you want a level gauge to meter
the liquid in a tank. The tank has 3/4"
NPT fittings, spaced 4 feet apart. The
maximum operating pressure and
temperature are 20 PSIG and 90 °F
respectively. You want an analog output to
be sent to a Kobold Transmitter
(purchased separately) and a 1/2" NPT
drain valve. You do not need any local
level indication.
Subject to change without prior notice.
Use the NBK Application Datasheet to
document all required process information.
The part number for the main component
(the bypass element) can be assembled
from the data in the »Ordering
Information« table at the top of this page.
The part numbers for the optional
accessory products are found in the left
hand column of the »NBK Options Table.«
The complete part number is assembled
as follows:
1. A 230 PSIG bypass tube with 3/4" NPT
fittings is an NBK-XXYZ, where:
1. XX = 03
(230 PSIG)
1. Y = 6
(NPT threads)
1. Z = 2
(3/4" thread size)
The complete order number is:
NBK-0362
2. Drain Valve:
-F
3. Analog Transducer:
-W
4. Length:
-Length = 4 ft.
The ordering information for the above
item must include the part number, the
measuring length and the process
information listed above:
NBK-0362-F-W
Length = 4 ft.
399
NBK - Bypass Level Gauges
NBK Bypass Level Gauge
Application Guide
Customer Name: _____________________________
Form #NBK-002
Rev. 02/01/04
Company Name: _____________________________
FAX to:
KOBOLD Instruments Inc.
412-788-4890 (USA)
514-428-8899 (Canada)
Quote #: ___________
Phone: ______________________________________
Fax: _________________________________________
Date: ____________ Price: _________ Each
Part Number: __________
Material
316 Stainless Steel (PVC Polypropylene and PVDF available upon request)
Teflon Lined 316 Stainless Steel
* To ensure fast order
processing, please retain
the completed quote form
and send it along with your
purchase order.
1. Pressure:
Normal _______PSIG Maximum _______PSIG
2. Temperature:
Normal _________˚F
Process Conditions
Maximum _______˚F
3. Liquid Type: _______________________
4. Liquid Specific Gravity at Normal Operating Temp: _________________
Accurate process information is
essential to ensure the proper
operation of your level indicator.
Please fill out accurately and
completely.
5. Liquid Viscosity: _______________ Centistoke
Mounting Configuration
1. Measuring Length M: ________ Inches (M=center to center length between fittings)
2. Fitting Size:
1/2”
3/4”
1”
1-1/4”
1-1/2”
2”
3. Fitting Type:
NPT Thread
150 LB ANSI Flange
300 LB ANSI Flange
Other (specify): __________________________________________________
Indicator Type
Polypropylene (212˚F Max. Temp.) Suffix-RP
Ceramic (750˚F Max. Temp.) Suffix-RK
Options
1. Switches (SPDT): Quantity __________ (See catalog for switch specifications)
Standard Switch (250˚F Max. Temp.) Suffix -R
Hi-Temp Switch (392˚F Max. Temp.) Suffix -RH
Very Hi-Temp (750˚F) Suffix -RHH
2. Analog Transducer and Signal Conditioner:
Drain Valve Suffix -F
Power Requirement _______
VAC
VDC
Level Measuring Scale
Transducer w/ integral 4-20 mA transmitter
Suffix -S (Scale in inches)
(2-wire, 16-32 VDC)
Scale mounted on left
Transducer only. For use w/ remote mounted signal
Scale mounted on right
conditioner/transmitter. (signal conditioner/
Top and Bottom Cleanout Flanges
transmitter sold separately. See catalog for
Suffix -J
DFM, DST or DFA series.)
3. Other Options/ Custom Configurations / Special Requirements (specify): ______________________
400
Subject to change without prior notice.
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