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: email@example.com KOBOLD Instruments Canada Inc. 9A Aviation Pointe-Claire, QC H9R 4Z2 ☎ +1 514-428-8090 Fax +1 514-428-8899 E-mail: firstname.lastname@example.org 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.
* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project