NBK-M - Economical Level Indicator

NBK-M - Economical Level Indicator

Special Features:

316 Stainless Steel Tube
Maximum Pressure: 580 PSIG
Maximum Temperature: 390°F
Measuring Lengths to 9.8 Ft.
Optional Switches, Transmitters and Digital Displays Available
Economical Rugged Design
PRICES START AT $500

Table 1: Process Temperature Limits for Various Options

*All options not listed in this table have a maximum process temperature limit of 390°F

General Description

The Mini-NBK bypass level indicator provides many of the unique features of our standard NBK series but at a fraction of the cost. Like its predecessor, the Mini-NBK uses revolutionary ring magnet float design allowing the user full flexibility in adding roller indicators, switches and other options anywhere on the periphery of the bypass tube.

The use of lighter gauge materials and a streamlined manufacturing process makes the Mini-NBK a very economical choice for low pressure level measuring applications.

Roller Indicators:
A magnetic indicator strip allows the user to take local level readings at the tank. The indicator rollers rotate from white to red as tank level changes. The roller indicator assembly can be rotated in the field to any position on the bypass tube in order to allow for easy readings when installed in a tight location. Rollers are available made of polypropylene for low temperature applications (<212°F) and ceramic for higher temperature applications.

Switches:
SPDT switches are available to use hi/low level alarms or for automatic tank fill/empty operations. The switch level setpoint is adjusted in the field by sliding the switch assembly up or down on the bypass pipe.

Level Transducers:
Magnetostrictive and variable resistance level transducers are available for transmission of tank level to a remote indicator or control system.

Digital Indicators:
For units which have a transducer installed, a digital indicator can also be mounted on the Mini-NBK to allow for local digital indication, an analog output and/or switches. Contact your Flow-Network Representative for details.

Specifications

Max. Pressure
Threaded Fittings: 580 PSIG
Flanged Fittings: Per ANSI B16.5 or DIN for the specified flange rating to 580 PSIG Max.

Wetted Materials:
Bypass Pipe & Fittings: 316-Ti stainless steel
Float: Titanium
Seals: Buna-N standard, viton, silicone, Teflon and Kalrez optional

Roller Materials: Polypropylene or ceramic based on ordering code
Max. Liquid Viscosity: 200 Centistokes

Allowable Liquid SG:
Float style 8: Liquid specific gravity between 0.78 and 0.94
Float style 1: Water and any liquid with specific gravity above 0.95
Max. Measuring Length: 9.8 ft

Electrical Specifications

Level Transducers Resistive, Option-W
Output: Resistive 0 to 5 K-ohm Approx.
Working Voltage: 24 VDC Max.
Working Current: 100 mA Max.
Resolution: ±3/8” for Measuring lengths <6.6 Ft. ±3/4” for Measuring lengths>6.6Ft.
Max. Process Temperature: 390°F
Max. Ambient Temperature: 265°F
Electrical Connection: Cable gland, PG 9
Electrical Protection: NEMA 4/IP65
*Option W can be combined with DFM, DST or DFA series remote controllers/ transmitters to achieve an analog output, switching or remote indication.

Resistive, with Head Mounted Transmitter, Option-M
Output: 4-20 mA, 2-wire
Supply Voltage: 16-32 VDC
Max. Loop Burden: (Vsupply-9)/0.02 ohms
Resolution: ±3/8” for Measuring lengths <6.6 Ft. ±3/4” for Measuring lengths>6.6Ft.
Max. Process Temperature: 265°F
Max. Ambient Temperature: 175°F
Electrical Connection: Cable gland, PG 9
Electrical Protection: NEMA 4/IP65

Magnetostrictive, with Head Mounted Transmitter, Option-T
Output: 4-20 mA, 4-wire
Supply Voltage: 24 VDC +/-10%
Max. Loop Burden:500 ohms
Resolution: +/-1mm
Max. Process Temperature: 175°F
Max. Ambient Temperature: 175°F
Electrical Connection: Cable gland, PG 9
Electrical Protection: NEMA 4/IP65

Switches Low Temperature, Model NBK-R
Function: Bistable reed contact, SPDT
Ratings: Max. 60 watt, 230 VAC, 0.8A
Hysteresis: Approx. 1/2”
Max. Process Temperature: 212°F
Max. Ambient Temperature: 165°F
Electrical Connection: 10 Ft. PVC cable
Electrical Protection: NEMA 4X/IP67

High Temperature, Model NBK-RT200
Function: Bistable, magnetically activated, SPDT
Ratings: Max. 80 watt, 230 VAC, 1.0A
Hysteresis: Approx. 1/2”
Max. Process Temperature: 390°F
Max. Ambient Temperature: 290°F
Electrical Connection: Cable Gland, PG 9
Electrical Protection: NEMA 4X/IP65

Ordering Information

Dimensions

NBK-M - Economical Level Indicator