Model 835

SKU: 835

Tilt Switch

Theory of Operation

The Delta Controls Series 835 detects the presence or absence of material at the elevation of its probe. The arriving material pushes the lower end of the hanging probe to one side. An internal drop of liquid acts as a tilt sensor and signals when the probe moves to an angle of 15° away from vertical This tilt signal is handled in accordance with the programmed setup. The output relay energizes if the probe remains vertical for the preset time period. The interconnecting cable is very flexible. Each wire has rubber insulation. The overall jacket is abrasion resistant rubber.


  • Easy to install
  • Rugged and reliable
  • From 1 to 4 points in a single enclosure-40 to 220°F (-40 to 105°C) service
  • Sanitary probes
  • Long life probe cable
  • Program relay action
  • Heavy duty relay
  • Optional intrinsically safe probe barrier
  • Optional time delay


  • Circuit Board: Epoxy-glass; acrylic sealed
  • Relay: DPDT, 5 amps at 240 VAC
  • Relay Action: Energized when probe is vertical
  • Terminals: Clamp up to 12 gage (2mm) wire
  • Supply Power: VAC 50/60Hz, 20 watts
  • Operating Temperature: -20 to 190°F (-30 to 90°C)
  • Time Delay: From 1 to 90 seconds on return to vertical position


  • High silo level
  • Crusher bowl level
  • Empty conveyor alarm
  • Classifier screen overload
  • Conveyor belt overload
  • Hopper railcar loading tool
  • Conveyor belt misalignment
  • Vibratory feeder starvation
  • Plugged chute alarm
  • Differential level control

Optional Features

  • Output contacts are then SPDT: "A" Model Only
  • Differential Controls: High-Low using two probes; field selected
  • Intrinsic Safety Probe Barrier: Mounted is a separate housing, replaceable fuse, FM, CSA, CENELEC
  • Housing: NEMA 7X

Probe Specifications

  • Tilt Sensor: Liquid drop inside a welded steel chamber; has a second safety seal; 1 amp rating
  • Tilt Angle Sensed: 15° away from vertical in any direction, no additional action occurs during a global tilting of the probe.
  • Temperature Limits: -40 to 220°F (-40 to 105°C)
  • Wetted Materials: Stainless Steel, Nylon, PVC, PVDF, and exotic metals
  • Probe Cable: Oil resistant rubber insulation and jacket, flexible 41 x 34 stranded copper, 18 gage

Probe Applications

Type 60 Type 60 Probe Applications for Model 835 Tilt Switch - Delta Controls Gen'l Purpose For Most Solids
Type 61 Type 61 Probe Applications for Model 835 Tilt Switch - Delta Controls For Moving Solids, E.G. Conveyors
Type 64 Type 64 Probe Applications for Model 835 Tilt Switch - Delta Controls For Liquids & Powders
Type 65 Type 65 Probe Applications for Model 835 Tilt Switch - Delta Controls For Dense and Viscous Slurries
Type 66 Type 66 Probe Applications for Model 835 Tilt Switch - Delta Controls For Water and Thin Liquids
Option HB Option HB - Probe Applications for Model 835 Tilt Switch - Delta Controls Support For All Bail or Cable Supported Probes

Rod type probes are typically the best choice for lump, granulated, or powdered solids. The Type 60 is the best choice for most level detecting jobs. A Delta Controls Type 64 is usually required when the density is low or the material is an aerated powder.

A Delta Controls Type 61 paddle end probe is a good choice for most moving material detection needs. The large sensing area provides high sensitivity and is less affected by voids. Stainless steel bail material is basic and is suitable for most services. Use all stainless probes when the area is wet or corrosive. Polished all stainless is required for 3A sanitary services.

Slurries and liquids vary from extremely heavy and viscous to thin and watery. The Delta Controls Type 65 works well on heavy slurries.

The Delta Controls Type 64 and 66 are normally needed when the material is a clean liquid or is a liquid with entrained solids.

The Delta Controls Types 65 and 66 are cable suspended and do not have bails. They can be cable suspended if the surface is calm and still. The option CH and support pipe should be added if ripples, roiling, or surface choppiness are present.

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