Kayden CLASSIC® 812 Flow, Level, Interface Switch & Transmitter

Brand: Kayden Instruments
The Kayden CLASSIC 812 Flow, Level, Interface Switch & Transmitter features a precision welded, highly accurate stainless steel sensor. Ideal for liquids, gases & slurries in a clean or dirty process.

The CLASSIC 812 is available with a Raised Face or RTJ Flange, in a wide range of flange sizes, ANSI ratings and insertion lengths. All Kayden models feature a rugged flameproof enclosure with blind or lens covers available. Kayden’s advanced digital electronics will revolutionize the way you monitor and control your process.


  • Process Connection
    • Raised Face or RTJ Flange
  • Adjustable Set Point Range
    • 0-254 feet/s, 0-77 meters/s
  • Insertion 'U' Length
    • Available in 1/2" or 1 cm increments
    • Min. 2.5" to Max. 120" (6.0 - 305 cm)
  • Input Power
    • 12-24 Vdc & 115-230 Vac, 50-60 Hz
  • Operating Pressure (Maximum)
    • Per Flange Rating, ASME B16.5
  • Temperature Range (Sensor)
    • -45° to 200° C, -50° to 392° F
  • Local Enclosure
    • Aluminum Flameproof
    • 1" Female NPT Conduit Connection
  • Local Enclosure Cover
    • Blind or Glass Lens, Flameproof
  • Wetted Materials
    • 316/316L Stainless Steel
    • Other Materials Available
  • Outputs/Communications
    • Two Independent Relays (SPDT)
    • 4-20 mA
    • Modbus
    • Rated 120 Vac max, 30 Vdc max, 4A max
  • Approvals
    • FM
    • CSA
    • CRN
    • Single Seal
    • NACE
    • NEMA 4X
show more
Images are representations only.
The Kayden CLASSIC 812 Flow, Level, Interface Switch & Transmitter features a precision welded, highly accurate stainless steel sensor. Ideal for liquids, gases & slurries in a clean or dirty process.

The CLASSIC 812 is available with a Raised Face or RTJ Flange, in a wide range of flange sizes, ANSI ratings and insertion lengths. All Kayden models feature a rugged flameproof enclosure with blind or lens covers available. Kayden’s advanced digital electronics will revolutionize the way you monitor and control your process.


  • Process Connection
    • Raised Face or RTJ Flange
  • Adjustable Set Point Range
    • 0-254 feet/s, 0-77 meters/s
  • Insertion 'U' Length
    • Available in 1/2" or 1 cm increments
    • Min. 2.5" to Max. 120" (6.0 - 305 cm)
  • Input Power
    • 12-24 Vdc & 115-230 Vac, 50-60 Hz
  • Operating Pressure (Maximum)
    • Per Flange Rating, ASME B16.5
  • Temperature Range (Sensor)
    • -45° to 200° C, -50° to 392° F
  • Local Enclosure
    • Aluminum Flameproof
    • 1" Female NPT Conduit Connection
  • Local Enclosure Cover
    • Blind or Glass Lens, Flameproof
  • Wetted Materials
    • 316/316L Stainless Steel
    • Other Materials Available
  • Outputs/Communications
    • Two Independent Relays (SPDT)
    • 4-20 mA
    • Modbus
    • Rated 120 Vac max, 30 Vdc max, 4A max
  • Approvals
    • FM
    • CSA
    • CRN
    • Single Seal
    • NACE
    • NEMA 4X
626 models matching criteria
812-RAA142A-I0058-C1B0A3E
KAYDEN® CLASSIC® Thermal Flow, Level, Interface Switch, Modbus, 2" 300# RF SST Flange, 5.8"U Length, 316 SST Sensor, Local Electronics Enclosure with Blind Cover, Approvals: c CSA us (UL Standards), CRN
In Stock 3 - 7 days
$1,605.42USD
Does not ship to US
812-RAA121A-I0025-C1B0A1E
KAYDEN® CLASSIC® Thermal Flow, Level, Interface Switch, Modbus, 1" 150# RF High-Hub SST Flange, 2.5"U Length, 316 SST Sensor, Local Electronics Enclosure with Blind Cover, Approvals: c CSA us (UL Standards)
In Stock 3 - 7 days
$1,651.78USD
Does not ship to US
812-RAA121A-I0020-C1G0A3E
KAYDEN® CLASSIC® Thermal Flow, Level, Interface Switch, Modbus, 1" 150# RF High-Hub SST Flange, 2"U Length, 316 SST Sensor, Local Electronics Enclosure with Glass Lens Cover, Approvals: c CSA us (UL Standards), CRN
In Stock 1 - 2 weeks
$1,651.78USD
Does not ship to US
812-RAA121A-I0030-C1B0A1E
KAYDEN® CLASSIC® Thermal Flow, Level, Interface Switch, Modbus, 1" 150# RF High-Hub SST Flange, 3"U Length, 316 SST Sensor, Local Electronics Enclosure with Blind Cover, Approvals: c CSA us (UL Standards)
In Stock 3 - 7 days
$1,668.34USD
Does not ship to US
812-RAA121A-I0030-C1B0A3E
KAYDEN® CLASSIC® Thermal Flow, Level, Interface Switch, Modbus, 1" 150# RF High-Hub SST Flange, 3"U Length, 316 SST Sensor, Local Electronics Enclosure with Blind Cover, Approvals: c CSA us (UL Standards), CRN
In Stock 3 - 7 days
$1,668.34USD
Does not ship to US
812-RAA131A-I0025-C1B0A1E
KAYDEN® CLASSIC® Thermal Flow, Level, Interface Switch, Modbus, 1-1/2" 150# RF High-Hub SST Flange, 2.5"U Length, 316 SST Sensor, Local Electronics Enclosure with Blind Cover, Approvals: c CSA us (UL Standards)
In Stock 3 - 7 days
$1,697.32USD
Does not ship to US
812-RAA121A-I0040-C1B0A1E
KAYDEN® CLASSIC® Thermal Flow, Level, Interface Switch, Modbus, 1" 150# RF High-Hub SST Flange, 3"U Length, 316 SST Sensor, Local Electronics Enclosure with Blind Cover, Approvals: c CSA us (UL Standards)
In Stock 3 - 7 days
$1,701.46USD
Does not ship to US
812-RAA121A-I0040-C1B0A3E
KAYDEN® CLASSIC® Thermal Flow, Level, Interface Switch, Modbus, 1" 150# RF High-Hub SST Flange, 3"U Length, 316 SST Sensor, Local Electronics Enclosure with Blind Cover, Approvals: c CSA us (UL Standards), CRN
In Stock 1 - 2 weeks
$1,701.46USD
Does not ship to US
812-RAA121A-I0040-C1B0A9E
KAYDEN® CLASSIC® Thermal Flow, Level, Interface Switch, Modbus, 1" 150# RF High-Hub SST Flange, 4"U Length, 316 SST Sensor, Local Electronics Enclosure with Blind Cover, Approvals: FM
In Stock 3 - 7 days
$1,701.46USD
Does not ship to US
812-RAA121A-I0045-C1B0A3E
KAYDEN® CLASSIC® Thermal Flow, Level, Interface Switch, Modbus, 1" 150# RF High-Hub SST Flange, 4.5"U Length, 316 SST Sensor, Local Electronics Enclosure with Blind Cover, Approvals: c CSA us (UL Standards), CRN
In Stock 3 - 7 days
$1,718.02USD
Does not ship to US
812-RAA141A-I0020-C1B0A1E
KAYDEN® CLASSIC® Thermal Flow, Level, Interface Switch, Modbus, 2" 150# RF SST Flange, 2"U Length, 316 SST Sensor, Local Electronics Enclosure with Blind Cover, Approvals: c CSA us (UL Standards)
In Stock 3 - 7 days
$1,720.50USD
Does not ship to US
812-RAA141A-I0025-C1B0A3E
KAYDEN® CLASSIC® Thermal Flow, Level, Interface Switch, Modbus, 2" 150# RF SST Flange, 2, 5"U Length, 316 SST Sensor, Local Electronics Enclosure with Blind Cover, Approvals: c CSA us (UL Standards), CRN
In Stock 3 - 7 days
$1,734.58USD
Does not ship to US
812-RAA121A-I0050-C1B0A1E
KAYDEN® CLASSIC® Thermal Flow, Level, Interface Switch, Modbus, 1" 150# RF High-Hub SST Flange, 5"U Length, 316 SST Sensor, Local Electronics Enclosure with Blind Cover, Approvals: c CSA us (UL Standards)
In Stock 3 - 7 days
$1,734.58USD
Does not ship to US
812-RAA122A-I0025-C1B0A1E
KAYDEN® CLASSIC® Thermal Flow, Level, Interface Switch, Modbus, 1" 300# RF High-Hub SST Flange, 2.5"U Length, 316 SST Sensor, Local Electronics Enclosure with Blind Cover, Approvals: c CSA us (UL Standards)
In Stock 3 - 7 days
$1,738.72USD
Does not ship to US
812-RAA131A-I0040-C1B0A9E
KAYDEN® CLASSIC® Thermal Flow, Level, Interface Switch, Modbus, 1-1/2" 150# RF High-Hub SST Flange, 4"U Length, 316 SST Sensor, Local Electronics Enclosure with Blind Cover, Approvals: FM
In Stock 3 - 7 days
$1,747.00USD
Does not ship to US
812-RAA141A-I0030-C1B0A1E
KAYDEN® CLASSIC® Thermal Flow, Level, Interface Switch, Modbus, 2" 150# RF SST Flange, 3"U Length, 316 SST Sensor, Local Electronics Enclosure with Blind Cover, Approvals: c CSA us (UL Standards)
In Stock 3 - 7 days
$1,749.48USD
Does not ship to US
812-RAA141A-I0035-C1B0A1E
KAYDEN® CLASSIC® Thermal Flow, Level, Interface Switch, Modbus, 2" 150# RF SST Flange, 3.5"U Length, 316 SST Sensor, Local Electronics Enclosure with Blind Cover, Approvals: c CSA us (UL Standards)
In Stock 3 - 7 days
$1,763.56USD
Does not ship to US
812-RAA121A-I0060-C1B0A3E
KAYDEN® CLASSIC® Thermal Flow, Level, Interface Switch, Modbus, 1" 150# RF High-Hub SST Flange, 6"U Length, 316 SST Sensor, Local Electronics Enclosure with Blind Cover, Approvals: c CSA us (UL Standards), CRN
In Stock 3 - 7 days
$1,767.70USD
Does not ship to US
812-RAA123A-I0025-C1B0A1E
KAYDEN® CLASSIC® Thermal Flow, Level, Interface Switch, Modbus, 1" 600# RF High-Hub SST Flange, 2.5"U Length, 316 SST Sensor, Local Electronics Enclosure with Blind Cover, Approvals: c CSA us (UL Standards)
In Stock 3 - 7 days
$1,767.70USD
Does not ship to US
812-RAA123A-I0025-C1B0A3E
KAYDEN® CLASSIC® Thermal Flow, Level, Interface Switch, Modbus, 1" 600# RF High-Hub SST Flange, 2.5"U Length, 316 SST Sensor, Local Electronics Enclosure with Blind Cover, Approvals: c CSA us (UL Standards), CRN
In Stock 1 - 2 weeks
$1,767.70USD
Does not ship to US
812-RAA151A-I0025-C1B0A9E
KAYDEN® CLASSIC® Thermal Flow, Level, Interface Switch, Modbus, 3" 150# RF SST Flange, 2.5"U Length, 316 SST Sensor, Remote Electronics Enclosure with Glass Lens Cover, Approvals: FM
In Stock 1 - 2 weeks
$1,767.70USD
Does not ship to US
812-RAA141A-I0040-C1B0A1E
KAYDEN® CLASSIC® Thermal Flow, Level, Interface Switch, Modbus, 2" 150# RF SST Flange, 4"U Length, 316 SST Sensor, Local Electronics Enclosure with Blind Cover, Approvals: c CSA us (UL Standards)
In Stock 3 - 7 days
$1,778.46USD
Does not ship to US
812-RAA141A-M0100-C1B0A1E
KAYDEN® CLASSIC® Thermal Flow, Level, Interface Switch, Modbus, 2" 150# RF SST Flange, 10 cm U Length, 316 SST Sensor, Local Electronics Enclosure with Blind Cover, Approvals: c CSA us (UL Standards)
In Stock 3 - 7 days
$1,778.46USD
Does not ship to US
812-RAA131A-I0050-C1B0A1E
KAYDEN® CLASSIC® Thermal Flow, Level, Interface Switch, Modbus, 1-1/2" 150# RF High-Hub SST Flange, 5"U Length, 316 SST Sensor, Local Electronics Enclosure with Blind Cover, Approvals: c CSA us (UL Standards)
In Stock 3 - 7 days
$1,780.12USD
Does not ship to US
812-RAA132A-I0030-C1B0A3E
KAYDEN® CLASSIC® Thermal Flow, Level, Interface Switch, Modbus, 1-1/2" 300# RF High-Hub SST Flange, 3"U Length, 316 SST Sensor, Local Electronics Enclosure with Blind Cover, Approvals: c CSA us (UL Standards), CRN
In Stock 3 - 7 days
$1,782.60USD
Does not ship to US

CLASSIC® 812

Sensor Material

Flange Material

Process Connection Flange Type

Process Connection Flange Type

Process Connection Flange Type

Flange Size & ANSI Rating

Select your desired ANSI size and pressure class.

Flange Size & ANSI Rating

Select your desired ANSI size and pressure class.

Flange Size & ANSI Rating

Select your desired ANSI size and pressure class.

Flange Size & ANSI Rating

Select your desired ANSI size and pressure class.

Flange Size & ANSI Rating

Select your desired ANSI size and pressure class.

Flange Size & ANSI Rating

Select your desired ANSI size and pressure class.

Insertion 'U' Length

Insertion 'U' Length

Insertion 'U' Length

Cover for Local Enclosure

Remote Electronics Enclosure & Cover

Agency Approvals

Typical Applications

Flow
  • Ammonia Storage
  • Biogas Flow
  • Catalysis Vessels
  • Chemical Injection & Additive Flow Monitoring
  • Chemical Reactors
  • Chlor-alkali Processes
  • Compressors
  • Condensers
  • Deionization Tanks
  • Digester Gas Flow
  • Distillation Columns
  • Drain Line Flow
  • Emergency Eye Wash & Shower Stations
  • Fermentation Vessels
  • Flare Gas Monitoring
  • Flare Knock-out Drums
  • Flow Monitoring & Verification
  • Heat Exchangers
  • Heat Recovery Steam Generator (HRSG) – Power & Utilities
  • High Pressure Flows
  • Leak Detection
  • Lube Oil Systems
  • Monitoring Purge Air Flow
  • Natural Gas to Boilers
  • Pumps
  • Reboilers
  • Refinery Flow Applications
  • Relief Valve & Rupture Disk Flow Monitoring
  • Remote Indication of Flow via Analog Output & Digital Communications
  • Pump Protection - Dry Alarm
  • Tank Blanketing
  • Tank Overflow Protection
  • Tanker Loading & Unloading
  • Water & Wastewater
  • Vaporizers
  • Vent Monitoring
Level
  • Biogas Dehydration
  • Blending Operations
  • Carbon Slurry Level
  • Compressor Scrubber
  • Compressor Waste Liquid
  • Condensate Receiver Tanks
  • Cooling Tower Basins
  • Crude Desalting
  • Crude Dehydration
  • Deionization Tanks
  • Digester Blow Tanks
  • Free Water Knock-out Tanks – High, Low and Interface Level
  • Geothermal - Degasser Tanks
  • Geothermal - Steam & Brine Separators
  • Leak Detection (Accumulation Reservoir)
  • Lime Slurry Level
  • Mixing & Blending Systems
  • Oil Separators & Treaters – High, Low & Interface Level
  • Production Fluid Storage
  • Pulp Bleaching Towers
  • Pulp Digesters
  • Pulp Storage
  • Pulp Washing Systems
  • Sampler Systems
  • Sand Separators
  • Scrubber Vessels
  • Storage Tanks
  • Sumps - All Types of fluids: Water, Oil, etc.
  • Surge Tanks
  • Tank Overflow
  • Turpentine Recovery
  • Vapor & Liquid Separation
  • Vapor Recovery
Interface
  • Crude Desalting
  • Interface Control in Separation Vessels
  • Interface Detection
  • Interface Control & Level Detection in Settling Vessels
  • Liquid-liquid Extraction - LLX
Media
  • Liquids, Air & Gases
  • Slurries
  • Corrosive Liquids
Areas
  • Flameproof, Hazardous & General-Purpose Areas

>    IDEAL PROCESS CONDITIONS FOR FLOW    <

Liquids
  • Consistent Process Composition & Temperature
  • Sufficient Straight Run Flow Profile (minimizes turbulence)
  • Recommended Minimum of 5 Pipe Diameters from any Disturbance
Air & Gas
  • Consistent Process Composition & Temperature
  • Sufficient Straight Run Flow Profile (minimizes turbulence)
  • Clean and Dry
Slurries
  • Consistent Process Composition & Temperature
  • Sufficient Straight Run Flow Profile (minimizes turbulence)
Emulsion
  • Consistent Process Composition & Temperature
  • Sufficient Straight Run Flow Profile (minimizes turbulence)

>    UNDESIRABLE PROCESS CONDITIONS FOR FLOW    <

Liquids
  • Inconsistent Process Composition or Temperature
  • Insufficient Straight Run
  • Aerated Fluids
  • Turbulence
Air & Gas
  • Inconsistent Process Composition or Temperature
  • Wet or Saturated Air & Gas
Slurries
  • Inconsistent Process Composition or Temperature
  • Insufficient Straight Run
  • Aerated Fluids
  • Turbulence
Emulsion
  • Inconsistent Process Composition & Temperature
  • Insufficient Straight Run
  • Aerated Fluids
  • Turbulence
Solids
  • Dry granulated processes are NOT good candidates for thermal switches

Documentation

Review this product and let us know your experiences

Write a Review

Ask a Question

Write a Question