OPTISWITCH 6700 Capacitance Level Switch for Food & Pharma


Offering the same point-level detection of liquids and solids as previous models, the OPTISWITCH 6700 Capacitance Level Switch features 10-Link communication with high and low-level detection. Ideal for overfill and dry-level protection of food and pharmaceutical products, the switch monitors CIP and SIP cleaning processes, media separation, clogged or blocked pipes, moisture levels, and offer dry-run protection.


The 6700’s double output can be individually programmed to monitor different processes or media, making it ideal for adhesives and difficult products as detection is not affected by product build-up, foam or condensation. Additionally, this switch offers a maintenance-free function with an optimal sensor shape for cleaning.


Highly customizable, it offers a wide range of available hygienic adapters, the potential to add a sliding connection for tanks with thicker walls and insulation, and an alternate sensor version complete with reverse-threaded G¾ connection, enabling low-level detection from the top of the tank.


  • With IO-Link interface for quick configuration; two freely programmable outputs are available, e.g. IO-Link/PNP, IO-Link/NPN, IO-Link/4 to 20 mA, etc.
  • Point-level detection of liquids, solids, and liquid-liquid interface
  • -40 to 239°F (-40 to 115°C) (extended length version up to 302°F (150°C)); non-hygienic version up to 1,450 psi (100 bar)
  • Problem solver for adhesions and difficult products: level detection not affected by product build-up, foam or condensate
  • Switch points can be indicated by 360-deg. multicolor LEDs: available with a transparent polycarbonate collar or with the LEDs collar protected by a metal crown
  • Stainless steel housing with PEEK sensor material
  • Easy-to-clean, minimized risk of clogging by sticky products
  • Maintenance-free; can be installed in any mounting position
  • Wide variety of hygienic adapters are available
  • Also available with a sliding connection for tanks with thick wall thickness/insulation or to overcome high process temperature
  • Sensor version with reverse-threaded G¾ connection allows for mounting in a pipe extension tube for low-level detection from the top
  • Adaptive trigger for quick-set-up and commissioning

General Applications:

  • Level detection of liquids, pastes, and solids
  • Dry-run protection and media separation
  • Interface detection
  • Media differentiation
  • Moisture determination
  • Detection of clogged or blocked pipes

F&B; Life Sciences Applications:

  • Point-level detection of food and pharma products (e.g. mustard, cream, honey, flour, sugar, toothpaste, etc.)
  • Monitoring of CIP and SIP cleaning processes
Product PositioningFor hygienic and industrial applications
Product VariantsOPTISWITCH 6700 C: Compact housing
Measurement VariablesLevel
Measurement PrincipleMicrowave/Frequency sweep
Level Measurement TypePoint level detection
Contact to Measured MediumYes
Interface MeasurementYes
Measured MediaBulk solids, foam, granulates, liquid/liquid interface,
liquids, pastes, powders, slurries, solids
Operating Conditions
Process Pressure-14.5 to 1,450 psi (-1 to 100 bar)
Variant with G½ hygienic: max. 145 psi (10 bar)
Variant with sliding connection: max. 72.5 psi (5 bar)
Process Temp.-40 to 239°F (-40 to 115°C)
Variant with sliding connection: up to 302°F (150°C)
GasketsEthylene propylene diene monomer (EPDM),
Fluoroelastomer rubber (FKM), Nitrile butadiene rubber (NBR), Silicone
Wetted PartsPolyetheretherketone (PEEK)
Process Connections
Thread ConnectionsMale: G½ (ISO 228-1), G½ (DIN 3852-E), 
½ NPT, G¾, reverse-threaded (ISO 228-1), 
G½ for hygienic adapters
Hygienic ConnectionsDairy screw (DIN 11851): DN25, DN40, DN50
Tri-Clamp: 1.5, 2 in. (38.1, 50.8 mm)
DIN clamp (32676): DN25, DN32, DN40, DN50
ISO clamp (2852): 25, 38, 51
Varivent: N
SMS (1145): 2 in. (51 mm)
Weld-in sleeve: 1.2 in. (30 mm)
Weld-in sleeve with shoulder: 1.1 in. (29 mm)
Collared weld-in sleeve: 1.8 in. (45 mm)
Spherical weld-in sleeve: 1.2 in. (35 mm)
Ingress ProtectionIP67, IP69K
Certificates/Approvals HygienicEC 1935/2004, EC2023/2006, FDA
Analogue Outputs4 to 20 mA
Discrete OutputsNPN/PNP
Digital OutputsIO-Link


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