Kobold nbk-m User manual

Operating Instruction
Mini Bypass Level Indicator
Model: NBK-M
NBK-M_manual_3-4-04

NBK-M
1. Contents
1. Contents........................................................................................................2
2. Note ..............................................................................................................3
3. Instrument Inspection....................................................................................3
4. Regulation Use .............................................................................................3
5. Operating Principle .......................................................................................5
6. Mechanical Connection.................................................................................6
7. Electrical Connection ....................................................................................7
7.1. Switch (option).....................................................................................7
7.2. Resistive level transducer (option ..W..) ..............................................7
7.3. Resistive level transducer with transmitter (option ..M..)......................8
7.4. Magnetostrictive sensor with 4-wire transmitter (option ..T..)............... 9
8. Startup ..........................................................................................................9
9. Trouble Shooting......................................................................................... 10
10. Technical Information.................................................................................. 11
11. Order Codes ............................................................................................... 13
12. Maintenance ...............................................................................................13
13. Dimensions .................................................................................................14
Manufactured and sold by:
Kobold Messring GmbH
Nordring 22-24
D-65719 Hofheim
Tel.: [phone]
Fax: [phone]
E-Mail: [email protected]
Internet: www.kobold.com
USA
Kobold Instruments, Inc.
1801 Parkway View Drive
Pittsburgh, PA 15228
PH: 412-788-2830
FAX: [phone]
[email protected]
www.koboldusa.com
CANADA
KOBOLD Instruments Canada Inc.
9A de l'Aviation
Pointe Claire, QC H9R 4Z2
Telephone: [phone] and
[phone]
Fax: [phone]
E-mail: [email protected]
Page 2 NBK-M_manual_3-5-04.doc

NBK-M
2. Note
Please read these operating instructions before unpacking and putting the unit
into operation. Follow the instructions precisely as described herein.
These instruments are only to be used, maintained and serviced by persons
familiar with these operating instructions and in accordance with local regulations
applying to Health & Safety and prevention of accidents.
3. Instrument Inspection
Instruments are inspected before shipping and sent out in perfect condition.
Should damage to a device be visible, we recommend a thorough inspection of
the delivery packaging. In case of damage, please inform your parcel service /
forwarding agent immediately, since they are responsible for damages during
transit.
What’s included in the shipment:
The standard delivery includes:
Level Indicator model: NBK-M•
• Operating Instructions
Note: If switches were ordered as an option, they will not be attached to the level
indicator. They are packed inside the shipping container. Be sure to check the
packaging for any extra items.
Please inspect the devices using the packing slip. All options are listed here.
4. Regulation Use
Any use of the model: NBK-M which exceeds the manufacturers specification
may invalidate its warranty. Therefore any resulting damage is not the
responsibility of the manufacturer. The user assumes all risk for such usage.
The NBK-M Mini Bypass Level Indicator is used for continuous measurement,
indication, and monitoring of liquids in tanks, vessels, reservoirs, basins etc.
Information is displayed on a magnetically coupled roller indicator.
NBK-M_manual_3-5-04.doc Page 3

NBK-M
4.1. Bypass measuring tube system
The bypass tube is attached at the side of the vessel with a connecting flange or
a threaded coupling. The installation position is always vertical. The NBK should
only be used for liquids with the medium density specified on the nameplate.
Otherwise the indication may be in error or the float may submerge and give no
level indication. Vessel inner pressure and medium temperature should not
exceed the specified maximum values, as this can lead to instrument damage or
personnel injury. It is imperative to ensure that the level indicator wetted materials
are chemically resistant to the liquid being measured.
Proper operation is also impaired by:
High degree of soiling•
•
•
•
Solids
Crystallization
Ferrite particles
4.2. Adjustable setpoint switches (option)
The optional adjustable switches serve to signal a preset level.
Important!
Attention !
Observe the maximum electrical ratings for the switches.
Maximum values Standard
contact
High temperature
contact
Breaking capacity: 40 VA 80 VA
Switching current: 0.8 A 1 A
Switching voltage: 230 V 220 V
4.3. Variable Resistance Transducer
(options..M & W..)
The optional remote electrical sensor converts the liquid level to a resistance
value (Option W). A version of this transducer can also be supplied with an
integral 4-20 mA transmitter (Option M).
Please note max. medium and ambient temperatures.
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NBK-M
4.4. Magnetostrictive Level Transmitter (option..T..)
Remote level transmission can be achieved by mounting a magnetostrictive sen-
sor outside the bypass tube. A continuous standard 4 to 20 mA signal is obtained
with a built-in transmitter. This signal can then be displayed on analog or digital
indicators, or taken as an input to a computer system.
5. Operating Principle
The NBK-M is a bypass tube which is attached to the top and bottom of a vessel.
The liquid level in the bypass tube will equalize with the liquid level in the vessel
and will therefore will correspond to the level in the vessel to which it is attached.
A float with flush-encased magnet in the bypass tube follows the liquid level. The
magnetic float activates a roller indicator that is externally attached. As the float
passes by, the red/white rollers rotate through 180° about their own axis. Red
indicates the actual level, whereas white means no level. The actual tank level is
read at the red/white roller interface.
The float’s magnetic field propagates in an annular fashion 360° around the
periphery of the float. For this reason, the roller indicator, switches and level
transducer can be mounted anywhere on the external portion of the bypass tube
within the limits of float travel.
NBK-M_manual_3-5-04.doc Page 5

NBK-M
6. Mechanical Connection
Remove bottom flange from bypass
tube, and insert the cylindrical float in
the NBK bypass tube with the designa-
tion "TOP" at the top. Re-position the
gasket and close the bottom flange
again; firmly tighten the flange bolts.
Mount and tighten the bypass tube to
the vessel to be monitored with process
connection and seal.
Normally it is sufficient to fix the
complete NBK with both process
connections. However should the
NBK be sub
j
ected to constant shock
or strong vibrations it is
recommended that the instrument is
secured with rubber-damped pipe
clamps.
To allow for dis-assembly, cleaning and
maintenance, the bypass tube should
never be welded.
Mount and tighten the magnetic rolle
r
indicator - if not already mounted - on
the bypass tube with the two
accompanying clamps.
Mount and tighten the Switches -i
f
supplied, on the bypass tube with the
accompanying clamps. The rolle
r
indicators must be loosened so that the
switch clamps can be inserted behind
the roller indicator prior to tightening.
The switches may be adjusted on the
bypass tube to meet the users set point
requirement. The cable connection must
point downwards. Tighten the switch
clamps securely. The switch must be
snug against the bypass tube. The
switch may not function if a gap exists
between the switch housing and bypass
tube.
Mount and tighten remote sensor -i
f
available and not already mounted - on
the bypass tube with the supplied
clamps. The cable terminal box is to
situated at the top of the bypass tube
assembly.
Bottom Flange
Standpipe
Indicator
Float
Roller indicator
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NBK-M
7. Electrical Connection
7.1. Switch (option)
Connect switch (if available) according to the diagram.
3
1
2
brown
black
blue
With cable connection
Connection box
When switching inductive loads, such as, contactors, relays,
etc, electrical limit values should not be exceeded (even for
short periods) e.g. by voltage peaks. The use of a contact
protection relay is recommended to avoid overloading the
switches.
Valid regulations for hazardous areas and installation
regulations , should be observed when installing the NBK level
indicator in hazardous areas.
7.2. Resistive Level Transducer (option ..W..)
Ensure that the electrical supply lines are de-energized.•
•
•
•
To avoid faults caused by electrical fields from other circuits, the cable should
not be laid in conduits with power cables cables.
Unscrew cover and pull supply lines through cable gland.
Connect the transmitter to the electronics according to the following table.
Transducer
"top"
Transducer
"bottom"
Variable
Tap
Silicon cable White brown green
PVC cable White brown green
FEP cable Brown blue black
Terminal
box Terminal 1 terminal 2 terminal 3
Internal* Yellow red black
*Please note: The colors of internal cables are for internal connections only
and therefore can only be seen in transducers with terminal box.
When connecting transducer to a Kobold transmitter, for example models DFA,
DST or DFM, please read the relevant operating instructions.
NBK-M_manual_3-5-04.doc Page 7

NBK-M
Service in hazardous areas
To operate the transducer in hazardous areas, the measuring circuit must contain
the appropriate intrinsic safety barrier to separate intrinsically safe circuits from
non-intrinsically safe circuits. Specially designed liquid level transducers with a
total resistance of 40 k Ohm are required for this purpose. Only the resistive
transducer (option W) can be installed in hazardous locations. Resistive
transducers with transmitter and the magnetostrictive transducers are not suitable
for installation in hazardous locations.
CAUTION: Installers must be familiar with all local and national codes
concerning electrical device installation in hazardous locations.
7.3. Resistive Level Transducer with Transmitter (option ..M..)
Ensure that the electrical supply lines are de-energized.•
•
•
•
To avoid faults caused by electrical fields from other circuits, the cables should
not be laid in conduits with power cables.
Unscrew cover and pull supply lines through the cable gland.
Connect the transmitter according to the terminal connection diagram below.
+
-
+
-
16-32 V DC
+
-
Page 8 NBK-M_manual_3-5-04.doc

NBK-M
7.4. Magnetostrictive Pick-up with 4-wire Transmitter (option ..T..)
Ensure that the electrical supply lines are de-energized.•
•
•
•
To avoid faults caused by electrical fields from other circuits, the cables should
not be laid in conduits with power cables.
Unscrew cover and pull the supply lines through the cable gland.
Connect the transmitter according to the terminal connection diagram below.
GND
+Us
AGND
AOUT
+
-
4-20 mA
24 V DC
+
-
8. Startup
Fill vessel, and switch on the electrical controller, if present.
The entering liquid lifts up the float and thus the coupled magnet actuator. The
roller indicator indicates the liquid level.
Commissioning of electrical reed switches
Function of switches
All switches have three connection poles (black (2), blue (3) and brown (1)).
The black wire (2) is the common pole for both switching functions
(N/C and N/O contact).
black (2) / blue (1) black (2) / brown (3)
float above closed open
float below open closed
brown
black
blue
With cable connection
NBK-M_manual_3-5-04.doc Page 9

NBK-M
The float must pass the switch once in both directions so that the switching
function is in line with the wiring diagram and table on page 10.
Note that the switch cable must point downwards.
These instructions are often ignored when an alarm lamp is connected and it is
assumed that the switch is damaged.
When the switch has passed in both the directions, it is ready for operation and
requires no maintenance.
Hysteresis
Hysteresis is the difference between contact closing
and opening points. A hysteresis of approximately
15 mm float movement is achieved by factory tuning of
the float magnet and the contact.
9. Trouble Shooting
Error: The tank is full but there is no indication
Check that the float is present in the system.•
•
•
•
•
•
If the float is present, check whether it is being blocked by foreign objects or
dirt deposits.
Check the op. SG of the float and the medium if the liquid density is too low for
the float it will sink and not provide indication.
Error: The tank is full but the indication is too low.
Check that the density of the liquid is in accordance with the density prescribed
on the indicator nameplate.
Check that the float has been correctly installed.
Check if dirt deposits in the over-head tube are blocking the float.
Page 10 NBK-M_manual_3-5-04.doc

NBK-M
10. Technical Information
Bypass tube: Ø 40 mm (1.57”)
Material: 1.4571/316 SS
O-Ring (Ground flange): Buna-N
(other materials as options)
Operating pressure: PN 6/16/40 (87/232/580 PSIG)
Service temperature: to 120°C (250°F) with polypropylene rollers
to 200°C (390°F) with ceramic rollers
Viscosity: max. 200 centistoke
Max. measuring length: to 3000 mm (120”) one-piece
Total length: according to measuring length,
see dimension drawing
Float: titanium, closed
Special versions on request
PED 97/23/EG Art. 3 § 3, Diagram 1, Gr. 1
No CE- mark
Limit contacts model NBK-R, NBK-REx
Contact operation: bistable changeover contact
Switching hysteresis: approximately 15 mm
Switching capacity: 60 W/VA; 230 VAC/DC, 1.0 A (NBK-R)
Process temperature: max. 100 °C (212°F)
Ambient temperature: max. 75 °C (170°)
Protection type: IP 67/NEMA 4X
Connection: 3 Ft. PVC cable
Case: plastic
Limit contacts model NBK-RT200, NBK-RT400
Contact operation: bistable changeover contact
Switching hysteresis: approximately 15 mm
Switching capacity: 80 VA; 250 VAC; 1A
Process temperature: RT200 = 200 °C / RT400 = 400 °C
Protection type: IP 65 NEMA 4X
Design: aluminium pressure casing, terminal connection
Resistive Level Transducer: Option...W...
Total resistance: approximately 5 kΩ
Measuring-circuit voltage: max. 24 VDC
Measuring current: max. 0.1 A
Medium temperature: max. 200 °C (390°F)
Ambient temperature: max. 130 °C (265°F)
Protection type: IP 65 NEMA 4
Resolution: ±10 mm (0.4”) for measuring length < 78”
±20 mm (0.8”) for measuring length >78”
Transmitter model: ...M...
NBK-M_manual_3-5-04.doc Page 11

NBK-M
Resistance Transducer with 2-wire transmitter
Output: 4-20 mA
Auxiliary power: 16-32 VDC
Load: (UB–9 V) /0.02 A [Ω]
Medium temperature: max. 130 °C (265°F)
Ambient temperature: max. 80 °C (176°F)
Protection type: IP 65/NEMA 4
Resolution: ±10 mm (0.4”) for measuring length < 78”
±20 mm (0.8”) for measuring length >78”
Transmitter model: ...T...
Magnetostrictive sensor with 4-wire transmitter
Output: 4-20 mA
Load: max. 500 Ω
Max. length: 4000 mm (160”)
Supply voltage: 24 VDC, max. 150 mA
Power consumption: < 5 W (without load)
Accuracy: ± 1mm
Medium temperature: max. 120°C (250°F)
Ambient temperature: max. 80°C (176°F)
Protection type: IP 65/NEMA 4X
Page 12 NBK-M_manual_3-5-04.doc

NBK-M
11. Order Codes
Model Nominal Pressure Connection Nominal Diameter Roller Indicator Transmitter Medium Density Optionsn
NBK-M 1= PN 6
(not for ASME-Fl.) F= DIN Flange 10= DN 10
(only fori DIN Fl.) 0= without 0= without 8= from 0.8 g/cm³ 0= without
2= PN 16 (150 lbs) A= ASME-Flange 15= DN 15, 1/2" P= PP-rollers T= magnetostrictive 1= from 1.0 g/cm³ ...= (see list)
3= PN 40 (300 lbs) R= R-Thread 20= DN 20, 3/4" K= ceramic rollers W= resistive
N= NPT-Thread 25= DN 25, 1" M= resistive with
transmitter
NBK-R Standard limit contact
NBK-Rex Limit contact-Eex d IIC T6
NBK-RT200 High-temperature contact max. 200 °C
12. Maintenance
The drain plug should be opened now and again, to wash out any deposits in
case the liquid to be measured contains dirt particles, which could settle in the
bypass tube. If coatings have formed, the tank must be emptied or shut off; the
lower cover flange must then be removed. The float should then be removed
carefully from the vessel. The bypass tube can now be mechanically cleaned.
The inspection window for the roller indication is made of high-quality plexiglass
(glass for high-temperature display). It should be cleaned with a suitable cleaning
agent.
The indicator requires no further maintenance.
NBK-M_manual_3-5-04.doc Page 13

NBK-M
13. Dimensions
NBK-M with roller indication (millimeters)
Dimension C [mm] for DIN V-Flange
Model DN 10 DN 15 DN 20 DN 25
PN 6 46 47 47 46
PN 16 53 52 53 49
PN 40 53 55 55 51
Page 14 NBK-M_manual_3-5-04.doc

NBK-M
NBK-M with roller indicator and magnetostrictive transmitter (millimeters)
Dimension C [mm] for ASME V-Flange
Model ½“ ¾“ 1“
150 lbs 46 47 47
300 lbs 53 52 53
Dimension C for R- or NPT thread: 60 mm
Dimension A: Medium density 0,8 g/cm³: 285 mm
Medium density 1,0 g/cm³: 180 mm
NBK-M_manual_3-5-04.doc Page 15

NBK-M
14. Options
B Display model ADI-B with bar graph, sturdy aluminum housing,
mounted on bypass tube, for description, see brochure Z2
C Display model ADI-K with bar graph and digital display, sturdy aluminum
housing, mounted on bypass tube, for description, see brochure Z2
D Display model ADI-D with digital display, sturdy aluminum housing
mounted on bypass tube for description, see brochure Z2
E1 Drain flange DN 15, stainless steel 1.4571
E2 Drain flange DN 20, stainless steel 1.4571
E3 Drain flange, ASME 1/2", stainless steel 1.4571
E4 Drain flange, ASME 3/4", stainless steel 1.4571
L1 Drain valve G 1/4, stainless steel 1.4571
L2 Drain valve 1/4 NPT, stainless steel 1.4571
H1 Rinsing connection DN 15/PN 16, top and bottom
H2 Rinsing connection ASME 1/2", 150 lbs, top and bottom
M1 Measuring scale to 200°C, aluminum backing, engraved scale
M2 Measuring scale to 120°C, aluminum backing, polyester foil scale
P Radiographic examination DIN 54111 T1
Q Dye penetration test DIN 541152
X Pressure test with water 1.5 x PN
Z 3.1 B certificate as per EN 10204
R1 Drain screw, bottom, G 1/4, PTFE gasket
R2 Drain screw, bottom, 1/4 NPT, no gasket
W1 O-ring material (bottom flange): Viton
W2 O-ring material (bottom flange): silicone
W3 O-ring material (bottom flange): PTFE
W4 O-ring material (bottom flange): Kalrez/Chemraz
Page 16 NBK-M_manual_3-5-04.doc