Large Multipoint Float Level Switch
The KOBOLD NCG is a multipoint float level switch for liquids that monitors up to six user-specified level points on a single stem, in lengths up to 96 inches. Each unit is custom manufactured to order with your choice of stem material, process connection, float type, switch locations, and switch logic.
Operation is simple and proven: each float carries a magnet, and as the liquid level raises or lowers the float, its magnetic field actuates a hermetically sealed reed contact inside the stem, opening or closing the switch at that level. Switch accuracy is 1/8 inch (3.2 mm), and the series is designed for level monitoring and pump control applications for liquids.
NCG Key Specifications
The NCG operates at pressures up to 80 PSIG (5.5 bar) and temperatures from -40 to 176°F (-40 to 80°C). Standard SPST reed switches are rated 200 VDC / 150 VAC at 0.5 A, 70 W maximum.
- User-specified stem lengths up to 96 inches, with one to six switch points in user-specified locations
- Stem and fitting in 316 stainless steel or PVC; floats in 316 stainless steel, NBR, or polypropylene
- Minimum media specific gravity from 0.40 to 0.65, depending on float type
- Optional SPDT contacts (option D4) rated 150 VDC/VAC at 0.5 A, 20 W maximum — up to four SPDT points on stainless units, three on PVC units
- Optional weighted NBR floats (option B)
Materials and Media Compatibility
The NCG pairs 316 stainless steel or PVC stems and fittings with float choices in 316 stainless steel, NBR, or polypropylene (polypropylene floats are supplied on PVC-stem units). Every unit is assembled from the material set you select at time of order. This material range is designed to let you match the switch to the media being measured, ensuring that all wetted components are compatible with the process.
Custom Configuration for Your Application
Every NCG is built to order. You specify the process connection — 1/2 inch NPT male; 1-1/4 inch NPT, 2 inch NPT, or a 3 inch ANSI flange, each with a 1/2 inch NPT conduit connection; or a 1/2 inch tube end — the stem material, the number of switch points, each switch location, and whether each contact is normally open, normally closed, or an SPDT.
Switch points require 3 inches (76 mm) minimum between levels, 1-1/2 inches (38 mm) from the fitting to the highest level, and 2 inches (51 mm) from the stem end to the lowest level. Options include an adjustable fitting (option A; not available with PVC), weighted NBR floats (option B), SPDT contacts (option D4), and a NEMA 4x aluminum junction box with terminal strip (option NT).
Where Is the NCG Used?
The NCG is designed for level monitoring and pump control for liquids in small to medium sized tanks and vessels. Because one stem carries up to six factory-set switch points, a single NCG can provide high, low, and multiple intermediate switching — service that would otherwise require several separate single-point switches.
Electrical and Installation Considerations
NCG reed switches are pilot-duty devices. They are not designed to switch solenoid valves, motors, or other high-current loads directly. Switch points are factory set and are not adjustable in the field. Contacts are set in the dry (empty-tank) position.
Common Questions about Large Multipoint Magnetic Float Level Switches
One NCG stem carries up to six reed switch points, each factory set at a user-specified location. Minimum spacing is 3 inches (76 mm) between levels, with 1-1/2 inches (38 mm) from the fitting to the highest level and 2 inches (51 mm) from the stem end to the lowest level.
The NCG operates at pressures up to 80 PSIG (5.5 bar) and temperatures from -40 to 176°F (-40 to 80°C).
Standard NCG switches are SPST hermetically sealed reed contacts rated 200 VDC / 150 VAC at 0.5 A, 70 W maximum. The optional SPDT contact (option D4) is rated 150 VDC/VAC at 0.5 A, 20 W maximum, and is limited to four SPDT points on stainless units and three on PVC units.
No. NCG contacts are pilot-duty reed switches, not designed to switch motors, solenoid valves, or other high-current loads directly. An interface relay rated for the load with an MOV or RC filter protecting AC relay coils or a 1N4004 diode protecting DC coils against inductive kickback should be used.
Four float types are offered: a 316 stainless steel ball (minimum specific gravity 0.65), small NBR (0.40), large NBR (0.42), and polypropylene (0.50, on PVC-stem units). Weighted NBR floats are also available under option B.
Five fitting options are available: 1/2 inch NPT male; 1-1/4 inch NPT, 2 inch NPT, and a 3 inch ANSI flange, each with a 1/2 inch NPT conduit connection; and a 1/2 inch tube end. Stems and fittings come in 316 stainless steel, or PVC with fitting types 1, 3, 4, and 5.
Switch points are factory set and are not field-adjustable. In some cases, a float can be set to the opposite switch state by repositioning its collars, verified with an ohmmeter. Contacts are set in the dry, empty-tank position, so specify N/O or N/C per level when ordering. Option A adds an adjustable fitting (fitting types 2, 3, and 4; not available with PVC) that allows the fitting position on the stem to be adjusted, with a default adjustment distance of 4-3/8 inches (111 mm).
Standard units ship with 24-inch (610 mm) flying leads. Option NT adds an aluminum junction box with terminal strip (NEMA 4x) on fitting types 2, 3, and 4, adding approximately 3-3/8 inches (86 mm) to the unit.
Monthly preventive maintenance is recommended, or more often depending on tank conditions: disconnect all power, then clean and inspect the stem, floats, stops, and electrical connections. If damage is found, the unit should not be put back into service. There are no user-serviceable parts; a damaged or malfunctioning unit means the level switch must be either repaired by the factory or replaced.
Product Specifications
Instrument Type
Large multipoint float level switch for liquids
Switch Points
1 to 6 per unit, factory set in user-specified locations
Switch Accuracy
1/8" (3.2 mm)
Process Connections
1/2" NPT male; 1-1/4" NPT, 2" NPT & 3" ANSI flange, each with 1/2" NPT conduit; 1/2" tube end
Stem / Fitting Material
316 stainless steel; PVC (fitting types 1, 3, 5)
Float Materials
316 stainless steel, NBR (small or large), or polypropylene (PVC-stem units)
Minimum Specific Gravity
0.40–0.65 by float type (SS ball: 0.65; small NBR: 0.40; large NBR: 0.42; PP: 0.50)
Electrical Rating — SPST (standard)
200 VDC / 150 VAC, 0.5 A; 70 W max
Electrical Rating — SPDT (option D4)
150 VDC/VAC, 0.5 A; 20 W max (max. 4 SPDT points on SS units, 3 on PVC units)
Maximum Pressure
80 PSIG (5.5 bar)
Operating Temperature
-40 to 176°F (-40 to 80°C)
Options
A: adjustable fitting (types 2–4, not PVC); B: weighted NBR floats; D4: SPDT contacts; NT: NEMA 4x aluminum junction box with terminal strip (types 2–4)
Product Features
Large Multipoint Design for Liquids — Up to Six Switch Points per Unit
Stem Lengths up to 96" (2438 mm), Switch Locations Specified by the User
Multiple Material Combinations - 316 SS or PVC Stems; 316 SS, NBR, or Polypropylene Floats
Maximum Pressure of 80 PSIG (5.5 bar)
Operating Temperature of -40 to 176 °F (-40 to 80 °C)
Hermetically Sealed Reed Switch Contacts, N/O or N/C Logic per Switch Point; Optional SPDT Contacts
Optional Weighted NBR Floats
Custom Manufactured to Order; Single-Point and Multipoint Configurations
Optional Adjustable Fitting and NEMA 4x Aluminum Junction Box
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