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VKM Viscosity Compensated Flowmeter/Switch
Brand: KOBOLD Instruments, IncThe KOBOLD flowmeters and switches model VKM have a spring-loaded float, which slides within a cylindrical measuring tube and has an integral orifice which is believed to be unique.
This and other design features means that it has for the first time become possible to create a flowmeter and switch which fully compensates for viscosity and to a large extent for density even with very low flows.
The float of these patented devices contains a permanent magnet which actuates a potential free bistable reed contact mounted outside the flow thus ensuring hermetic separation between the medium and the electrical contact system.
The contact is embedded within a height-adjustable plastic housing to prevent damage to the contacts by mechanical action or aggressive atmospheres.
As the medium enters the instrument the float rises. Once its magnetic field reaches the contact tips of the reed switch the contact closes. As the flow increases the float rises further until it reaches its stop.
This prevents the float from going beyond the contact range of the magnetic operating tube, that is, the contact remains closed thus ensuring bistable switching.
Specifications
Brand
Accuracy
- ± 4 % of Full Scale
Applications
- Extruding Plant
- Hydraulics
- Lubrication Circuits
- Machine Tools
- Oil Lubrication Circuits
- Paper-Making Machines
- Printing Presses
Approvals & Certifications
- ATEX-Zone 1
BSP Connection
- G 1” Female
- G 1/2” Female
- G 1/4” Female
- G 3/4” Female
Electrical Connectors
- 2 metres Cable
- DIN EN 175301-803
- M12 x 1
Electrical Contacts
- Bistable Reed Contact
- Changeover Contact
- N/O Contact
- Normally Closed
- Normally Open
Electrical Rating
- N/O Contact & Chageover Contact (cCSAus) - Max.
- N/O Contact, Max.
Enclosure / Body Material
- 304 Stainless Steel
- Nickel-Plated Brass
Environmental Protection
- IP54
- IP65
- IP67
Flow Rate
- 0.01 to 0.07 LPM to Oil
- 8 to 80 LPM to Oil
Indication
- 3-Digit LED
Load Limit
- Maximum
Materials of Construction
- 301 Stainless Steel - Fitting
- 301 Stainless Steel - Float
- Ceramic - Magnet
- Nickel-Plated Brass - Fitting
- Nickel-Plated Brass - Float
- Oxide - Magnet
Maximum System Pressure
- psi: 5,076 (kPa: 35,000, bar: 350)
Mounting Position
- Any Orientation
NPT Connection
- 1” NPT
- 1/2” NPT
- 1/4” NPT
- 3/4” NPT
Orifice Material
- 301 Stainless Steel
Output
- 0-10 V
- 4-20 mA, 3-Wire, Max.
Output Format
- PNP or NPN Semiconductor
Power Supply Effect
- 24 Vdc ± 20 %
Process Fitting Details
- Screwed Fitting
Seat / Seal Material
- FPM
- NBR
Spring Material
- 301 Stainless Steel
Temperature Range
- Maximum