Model 104

SKU: 104

Capacitance Level Switch, Integral Mount, SPDT, Bare Probe Included

The Delta Controls Model 104 probe type control switches when a conductive material touches the tip of the sensing probe. More of the sensing probe must be covered when the material is insulating and has a lower dielectric constant. The Model 104 will sense most materials such as corn, lime, dolomite, coal, water, acid, sodium hydroxide, and coffee.

Features

  • Works on liquids, slurries, and some solids
  • Electronics Integrally mounted on a solid rod or flexible cable sensing probe
  • Probe length is field adjustable
  • 10 Amp SPDT heavy duty output relay
  • High-Low fail-safe relay action selector
  • Has an extended insulator, no cavity to plug up
  • Up to 220°F (105°C) process temperatures
  • Vibration resistant, no glass or epoxy seals to fracture and leak
  • Up to 1500 PSIG (100 bar) process pressure
  • Secondary fire and over pressure stop provides a metal-to-metal seal against catastrophic failure leaks
  • PTFE rod seal is reliable (unlike epoxy or glass)
  • High reliability; 100 hour operational test
  • Quality assured; 100% tested and inspected
  • Special circuitry rejects electrical noise
  • Integrating 1 second time delay standard
  • Economical to acquire, install and own

Specifications

  • Wetted Materials: 316 stainless steel body and rod; PTFE or Delrin® seals
  • Output: SPDT relay contacts, 10A @ 250 VAC
  • Action: Direct/Reverse, with fail-safe selector plug
  • Relay Condition: Indicated by bright LED
  • Time Delay: Integrating type, 1 second delay
  • Housings: integral 4X or X/P; aluminum, SS, or PVC
  • Accuracy: Better than 0.50% full scale
  • Repeatability: Better than 0.10% full scale
  • Process Temperature: -20 to +220°F (-30 to 105°C)
  • Temperature Effect: 0.50% full scale per 50°F (28°C) ambient change in temperature
  • Supply Power Needed: 10 VA @ 120 VAC, 240 VAC or 24 VDC
  • Other Materials and Variations: Available

Applications

The Delta Controls Model 104 probe type control switches when a conductive material touches the tip of the sensing probe. More of the sensing probe must be covered when the material is insulating and has a lower dielectric constant. The Delta Controls Model 104 will sense the level or presence of almost any sort of material, even insulators which have a low density and a low dielectric constant.

The unit is designed to detect high or low levels of liquids, slurries and solids. It is designed for mounting on the top of a tank, container, or open pit for high level detection. It is intended that the sensing probe extend down from the top to the point at which level switching is to occur. The unit can also be mounted so that its sensing probe extends in from the side of the container. This side mounting position should be limited to clean liquids and solids applications. Top mounted probes should be used for slurries and most typical tanks.

The sensed material may be conductive (water,acid, caustic) or nonconductive (oil, wheat, gasoline). The dielectric constant of the material should be 2.0 or higher. All water based compounds, most medium weight hydrocarbons (ammonia, crude oil, fuel oil, lube grease) and most solids (wheat, gravel, talc) meet this requirement.

Typical Services

  • High level alarm in liquid storage tanks
  • Boiling vat "Foam-over" alarm
  • Cement hopper high and low level alarms
  • Heating oil tank overfill alarm
  • Blending system low tank level shutdown
  • Plastic extruding machine hopper level control
  • Beer and beverage vat level alarms
  • Raw and sliced potato bin levels
  • Pumping gallery flood alarm
  • Tanker mounted overfill alarm
  • Ammonia levels in refrigeration
  • Standby fuel oil low level alarm
  • Citrus juice packaging machinery and tanks
  • Aquaculture water and nutrient control systems
  • Subsea oil production modules

Operation

The Delta Controls Model 104 is insensitive to buildup on the tip of its sensing probe. The deposited buildup material can be wet, sticky, or even an insulator. Recalibration or cleaning may be required under conditions such as extreme candeling, glacial salt bridging, etc. Radio frequency technology is the basis for this new and improved level control design. An advanced sensing method, using pulsed radio frequency waves, is the heart of this new circuit technique. This method produces excellent stability and good accuracy. False switching problems have essentially been eliminated by this design. High speed filtering and noise rejection provide highly reliable level detection and switching. Fail-safe relay action is selected with a gold contact plug. The relay can be normally energized or normally de-energized as required by the application.

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