Honsberg Flow Switches

CRG Flow Switch
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Technical data

Switch Micro switch
Nominal width DN 25..200
Process connection Male thread R 1 "
Tolerance ±15 % of full scale value
Pressure resistance PN 11 bar
Medium temperature -20..+120 °C
Ambient temperature -20..+85 °C
Media Water (oils and aggressive media available on request)
Switching voltage 250 V DC
Switching current 15(8) A
Protection class 1 - PE connection
Ingress protection IP 65
Electrical connection Cable screw gland M20x1.5
Non-mediumcontact materials ABS, PC transparent

Details :

  • Can be used from nominal width DN 25..200
  • Suitable for media with ferritic particles.


Characteristics : The devices function via the principle of a paddle supported by a metal bellows, and the triggering of a micro switch.

Handling and operation :

  • Attention! Paddle fixing unsecured. For critical conditions (e.g. vibration), fit a bolted fixing.
  • Include straight calming section of 10 x DN in inlet and outlet
  • If the media are dirty, install a filter.
  • It must be ensured that the values given for voltage, current, and power are not exceeded.
  • When switched on, a load must be connected in series.
  • The electrical details apply to ohmic loads. Capacitive and inductive loads must be operated using a protective circuit.
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FF Flow Switch
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Technical data

Switch Reed switch
Nominal width DN 8..40 (DN 50..80 available on request)
Process connection Female thread G 1/4 ..G 11/4
Tolerance ±3 % of the switching value, minimum ±0.3 l/min
Ambient temperature -20..+70 °C
Media Water (oils available on request)
Switching voltage Max. 230 V AC
Switching current Max. 1 A
Switching capacity Max. 50 VA
Protection class 1 - PE connection
Ingress protection IP 65
Electrical connection Cable 1.8 m
Non-mediumcontact materials PA, PVC
Materials medium-contact Rg 5 nickelled, 1.4310, CW614N nickelled, NBR, hard ferrite

Details :

  • Adjusted switching value
  • Highly reproducible
  • Insensitive to dirt


Characteristics : The volume flow raises a piston (fitted with a magnet) out from a valve seat against a spring force. The piston actuates a hermetically separated reed switch.

Handling and operation :

  • Include straight calming section of 5 x DN in inlet and outlet
  • If the media are dirty, install a filter (use magnetic filter for ferritic components).
  • It must be ensured that the values given for voltage, current, and power are not exceeded.
  • When switched on, a load must be connected in series. The electrical details apply to ohmic loads. Capacitive, inductive and lamp loads must be operated using a protective circuit.


Options :

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FW1 Flow Switch
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Technical data

Switch Reed switch
Nominal width DN 8..25
Process connection Female thread G 1/4..G 1 (further process connections available on request)
Tolerance ±10 % of full scale value
Pressure resistance PN 100 bar optionally up to PN 800 bar
Media temperature -20..+90 °C
Ambient temperature -20..+70 °C
Media Water (oils and aggressive media available on request)
Switching voltage Max. 230 V AC
Switching current Max. 0.5 A
Switching capacity Max. 50 VA
Protection class 2 - safety insulation
Ingress protection IP 67
Electrical connection For round plug connector M12x1, 4-pole
Materials medium-contact CW614N nickelled, CW614N, POM, 1.4310, hard ferrite
Non-mediumcontact materials PC, 1.4301, 1.4305

Details :

  • Economical design
  • High switching power
  • Insensitive to dirt


Characteristics : Mechanical flow switch, for fluid media, with spring-supported piston and magnetic triggering of a reed switch. Robust construction in brass and POM.

Handling and operation :

  • Include straight calming section of 5 x DN in inlet and outlet
  • Include a filter if the media are dirty (use magnetic filter for ferritic components).
  • It must be ensured that the values given for voltage, current, and power are not exceeded.
  • When switch on, a load must be connected in series.
  • The electrical details apply to ohmic loads. Capacitive, inductive and lamp loads must be operated using a protective circuit.


Options :

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HD1F Flow Switch
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Technical data

Switch Reed switch
Nominal width DN 8..25
Process connection Female thread G 1/4..G 1 (Further process connections available on request)
Tolerance ±5 % of full scale value
Pressure resistance PN 200 bar optionally PN 500 bar
Media temperature -20..+120 °C with display Z -20..+70 °C optionally -20..+150 °C
Ambient temperature -20..+70 °C
Media Water, oil (gases and aggressive media available on request)
Switching voltage Max. 250 V AC
Switching current Max. 1.5 A
Switching capacity Max. 50 VA
Protection class 2 - safety insulation
Ingress protection IP 65
Electrical connection Plug DIN 43650-A / ISO 4400 optionally for round plug connector M12x1, 4-pole
Non-mediumcontact materials PA, CW614N, NBR

Details :

  • High switching power
  • Compact design


Characteristics : Mechanical flow switch, for fluid or gaseous media, with spring-supported piston and magnetic triggering of a reed switch. Robust construction in brass or stainless steel.

Handling and operation :

  • Include straight calming section of 5 x DN in inlet and outlet
  • Include a filter if the media are dirty (use magnetic filter for ferritic components).
  • It must be ensured that the values given for voltage, current, and power are not exceeded.
  • When switch on, a load must be connected in series.
  • The electrical details apply to ohmic loads. Capacitive, inductive and lamp loads must be operated using a protective circuit.


Adjustment : If it is nece...

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HD1K Flow Switch
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Technical data

Switch Reed switch
Nominal width DN 8..25
Process connection Female thread G 1/4..G 1 (Further process connections available on request)
Tolerance ±5 % of full scale value
Pressure resistance PN 200 bar optionally PN 500 bar
Media temperature -20..+120°C with display Z -20..+70°C optionally -20..+150°C
Ambient temperature -20..+70 °C
Media Water, oil (gases and aggressive media available on request)
Switching voltage Max. 250 V AC
Switching current Max. 1.5 A
Switching capacity Max. 50 VA
Protection class 2 - Safety insulation
Ingress protection IP 65
Electrical connection Plug DIN 43650-A / ISO 4400 Optionally for round plug connector M12x1, 4-pole
Non-mediumcontact materials PA, CW614N, NBR

Details :

  • High switching power
  • Compact design


Characteristics : Mechanical flow switch, for fluid or gaseous media, with spring-supported piston and magnetic triggering of a reed switch. Robust construction in brass or stainless steel.

Handling and operation :

  • Include straight calming section of 5 x DN in inlet and outlet
  • Include a filter if the media are dirty (use magnetic filter for ferritic components).
  • It must be ensured that the values given for voltage, current, and power are not exceeded.
  • When switch on, a load must be connected in series.
  • The electrical details apply to ohmic loads. Capacitive, inductive and lamp loads must be operated using a protective circuit.


Adjustment : If it is nece...

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HD2F Flow Switch
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Technical data

Switch Reed switch
Nominal width DN 8..25
Process connection Female thread G 1/4..G 1 (Further process connections available on request)
Tolerance ±5 % of full scale value
Pressure resistance PN 200 bar optionally PN 500 bar
Media temperature -20..+120°C with display Z -20..+70°C optionally -20..+150°C
Ambient temperature -20..+70°C
Media Oil
Switching voltage Max. 250 V AC
Switching current Max. 1.5 A
Switching capacity Max. 50 VA
Protection class 2 - safety insulation
Ingress protection IP 65
Electrical connection Plug DIN 43650-A / ISO 4400 optionally for round plug connector M12x1, 4-pole
Non-mediumcontact materials PA, CW614N, NBR

Details :

  • High switching power
  • Compact design
  • viscosity-stabilized


Characteristics : Mechanical flow switch, for fluid or gaseous media, with spring-supported piston and magnetic triggering of a reed switch. Robust construction in brass or stainless steel.

Handling and operation :

  • Include straight calming section of 5 x DN in inlet and outlet
  • Include a filter if the media are dirty (use magnetic filter for ferritic components).
  • It must be ensured that the values given for voltage, current, and power are not exceeded.
  • When switch on, a load must be connected in series.
  • The electrical details apply to ohmic loads. Capacitive, inductive and lamp loads must be operated using a protective circuit.


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HFK30-IFIN Flow Switch
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Technical data

Sensor Calorimetric measurement principle
Process connection Smooth tube for crimp adapter or hose connection
Measurement accuracy ±3 % F.S. (H2O dist.)
Repeatability ±1 % MW (H2O dist.)
Temperature gradient 4 K/s
Start-up time 10 sec. after application of operating voltage
Response time In water (25°C) at an average flow speed of approx. 1-2 sec.
Process pressure PN 10
Pressure loss Max. 0.3 bar at max. flow
Media temperature 0..+100°C
Ambient temperature -20..+70°C
Storage temperature -20..+80°C
CIP- / SIP temperature With spacer 140°C, 30 minutes max.
Materials medium-contact 1.4404 (others available on request)
Materials, nonmedium- contact PPS, PA6.6, 1.4305
Power consumption Max. 2.5 W
Supply voltage 24 V DC ±10 %
Analog output 4..20 mA / Load 500 Ohm max. or 0..10 V / Load min. 1 kOhm
Electrical connection For round plug connector M12x1, 4-pole
Current consumption Max. 100 mA
Switching hysteresis Flow 2 % of end value temperature approx. 2 °C
Adjustment By means of magnet

Details :

  • Flow switch/transmitter for small flows in the foodstuffs industry
  • Combination with temperature switch or transmitter possible
  • No moving parts in the medium being measured
  • Only one medium-contact material
  • Simple to use
  • Low pressure loss
  • Various nominal widths
  • Rapid response times for a calorimetric Sensor
  • Linearised and temperature compensated


Characteristics :

  • The HFK30-FIN flow sensor monitors fluid media. Its compact form combines the measurement tube and converter / counter. The integrated transducer has an analog output (4..20 mA or 0..10 V) and one switching output, which can be configured as a limit switch for monitoring minimal or maximal, or as a frequency output.
  • The switching output is designed as a push-p...

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HFK35-FIN Flow Switch
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Technical data

Sensor Calorimetric measurement principle
Process connection Smooth tube for crimp connector or hose connection
Measurement accuracy ±3 % F.S. (H2O dist.)
Repeatability ±1 % MW (H2O dist.)
Temperature gradient 4 K/s
Start-up time 10 sec. after application of operating volt.
Response time In water (25°C) at average Flow speed of approx. 1-2 sec.
Process pressure PN 10
Medium temperature 0..+100°C
Ambient temperature -20..+70°C
Storage temperature -20..+80°C
CIP- / SIP temperature With spacer 140°C, 30 minutes max.
Materials medium-contact Stainless steel 1.4404 (others available on request)
Supply voltage 24 V DC±10 %
Analog output 0/4..20 mA or 0/2..10 V
Power consumption Max. 2.5 W
Hysteresis Adjustable, position of the hysteresis depends on minimum or maximum switching value
Electrical connection For round plug connector M12x1, 5-pole
Ingress protection IP 67
Weight Approx. 0.25 kg
Conformity CE

Details :

  • For foodstuffs use
  • Analog output 0/4..20 mA or 0/2..10 V
  • Two programmable switches (push-pull)
  • Graphical LCD display, backlit (transreflective), can be read in sunlight and in the dark
  • Programmable parameters via rotatable, removable ring (programming protection)
  • Full metal housing with non-scratch, chemically resistant glass
  • Physical unit in the display (selectable)
  • Rotatable electronic head for best reading position
  • Optionally CIP/SIP-capable (130 °C)
  • Connection to USB interface for setting parameters


Characteristics :

  • The HFK35-FIN calorimetric sensor measures small fluid flows, and has been designed specially for use in the foodstuffs industry (for the measurement principle, see also "General description: cal...

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LABO-XF-S Flow Switch
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Technical data

Sensor Dynamic diaphragm
Nominal width DN 8..25
Pressure loss Max. 0.5 bar at the end of the metering range
Media temperature 0..+70°C with high temperature option 0..150°C
Ambient temperature 0..+70°C
Storage temperature -20..+80°C
Supply voltage 10..30 V DC
Power consumption < 1 W (for no-load outputs)
Electrical connection For round plug connector M12x1, 4-pole
Ingress protection IP 67

Details :

  • Very short response time
  • High overload protection
  • Metering range 1:80
  • Low pressure loss
  • Compact design


Characteristics :

  • The integrated converter / counter make available an electronic switching output (push-pull) with adjustable characteristics (minimum/maximum) and hysteresis, which responds when an adjustable limit is fallen short of or exceeded. If desired, the switching value can be set to the currently existing flow using "teaching".
  • Models with analog or pulse output are also available (see separate data sheets). Because the diaphragm only bends, and functions without a bearing, there is almost no friction effect. The movement therefore occurs practically free of hysteresis, and the switching point has very good reproducibility.
  • The dia...

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MR Flow Switch
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Technical data

Switch Reed switch
Nominal width DN 8.0.25
Tolerance ±5 % of full scale value
Pressure resistance PN 200 bar (with optional display O1 G 1/4..G 3/4 PN 90)
Media temperature -20..+120°C
Ambient temperature -20..+70°C
Media Water (oils, gases and aggressive media available on request)
Switching voltage Max. 250 V AC
Switching current Max. 1.5 A
Switching capacity Max. 50 VA
Protection class 2 - safety insulation
Ingress protection IP 65
Electrical connection Cable 2.5 m (others cable lengths available on request)
Non-mediumcontact materials PA, PVC

Details :

  • High switching power
  • Compact design


Characteristics : Mechanical flow switch, for fluid or gaseous media, with spring-supported piston and magnetic triggering of a reed switch. Robust construction in brass or stainless steel.

Handling and operation :

  • Install straight calming section of 5 x DN in inlet and outlet.
  • Include a filter if the media are dirty (use magnetic filter for ferritic components).
  • It must be ensured that the values given for voltage, current, and power are not exceeded.
  • When switch on, a load must be connected in series.
  • The electrical details apply to ohmic loads. Capacitive, inductive and lamp loads must be operated using a protective circuit.


Options :

  • Sw...

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MR1K Flow Switch
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Technical data

Switch Reed switch
Nominal width DN 8..25
Tolerance ±5 % of full scale value
Pressure resistance PN 200 bar optionally PN 500 bar
Media temperature -20..+120 optionally -20..+150oC
Ambient temperature -20..+70oC
Media Water (oils, gases and aggressive media available on request)
Switching voltage Max. 250 V AC
Switching current Max. 1.5 A
Switching capacity Max. 50 VA
Protection class IP 65
Electrical connection Plug DIN 43650-A / ISO 4400, optionally round plug connector M12x1, 4-pole

Details :

  • High switching power
  • Compact design


Characteristics : Mechanical flow switch, for fluid or gaseous media, with spring-supported piston and magnetic triggering of a reed switch. Robust construction in brass or stainless steel.

Handling and operation :

  • Install straight calming section of 5 x DN in inlet and outlet.
  • Include a filter if the media are dirty (use magnetic filter for ferritic components).
  • It must be ensured that the values given for voltage, current, and power are not exceeded.
  • When switch on, a load must be connected in series.
  • The electrical details apply to ohmic loads. Capacitive, inductive and lamp loads must be operated using a protective circuit.


Options :

  • Si...

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RVM Flow Switch
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Technical data

Switch Reed switch
Nominal width DN 8
Process connection Female thread G 1/4
Tolerance ±10 % of full scale value
Media temperature -20..+100°C optionally 160°C
Ambient temperature -20..+70°C
Media Water (gas and aggressive media available on request)
Switching current Max. 0,7 A
Switching capacity Max. 20 VA
Protection class 2 - safety insulation
Ingress protection IP 65
Electrical connection DIN 43650-C plug
Non-mediumcontact materials Switching head PBT, PA, NBR, brass nickelled, stainless steel

Details :

  • Monitoring of small flows
  • PN 300 / 350


Characteristics : Mechanical flow switch, for fluid media, with magnetic triggering of a reed switch. Robust construction in brass or stainless steel.

Handling and operation :

  • Include straight calming section of 5 x DN in inlet and outlet.
  • If the media are dirty, install a filter (use magnetic filter for ferritic components).
  • It must be ensured that the values given for voltage, current, and power are not exceeded.
  • When switch on, a load must be connected in series.
  • The electrical details apply to ohmic loads. Capacitive, inductive and lamp loads must be operated using a protective circuit.


Options :

  • Switching values for oil or gas
  • ...

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UB1 Flow Switch
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Technical data

Switch Micro switch
Nominal width DN 25..200
Tolerance ±15 % of full scale value
Pressure resistance PN 16 bar
Medium temperature -20..+140°C (No superheated steam)
Ambient temperature -20..+70°C
Media Water (oils and aggressive media available on request)
Protection class 2 - safety insulation
Ingress protection IP 65
Non-mediumcontact materials PC, PA

Details :

  • Can be used from nominal width DN 25..200
  • Micro switch with gold-plating for small currents, and silver-plating for larger currents
  • Visual function control through transparent cover
  • Suitable for media with ferritic particles.


Characteristics : The devices function via the principle of a paddle supported by a metal bellows, and the triggering of a microswitch.

Handling and operation :

  • Attention! Paddle fixing unsecured. For critical conditions (e.g. vibration), fit a bolted fixing.
  • Include straight calming section of 10 x DN in inlet and outlet
  • If the media are dirty, install a filter.
  • It must be ensured that the values given for voltage, current, and power are not exceeded.
  • When switched on, a load must be ...

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UM3K Flow Switch
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Technical data

Switch Micro switch
Nominal width DN 15..80
Process connection Soldered/welded nozzle (further process connections available on request)
Tolerance ±15 % of full scale value
Pressure PN 25 bar
Medium temperature -20..+110°C
Ambient temperature -20..+70°C
Media Water (oils, gases and aggressive media available on request)
Switching voltage Max. 250 V AC (gold contact max. 125 V AC / 30 V DC)
Switching current Max. 5 A (round plug connector max. 4A) (gold contact max. 100 mA)
Protection class 2 - safety insulation
Ingress protection IP 65
Electrical connection Plug DIN 43650-A / ISO 4400, optionally for round plug connector M12x1, 4-pole
Non-mediumcontact materials ABS, PA, NBR
Weight 0.3 kg

Details :

  • Soldered/welded connection
  • Micro switch
  • Low pressure loss
  • Compact design
  • Threaded connection
  • Plug DIN 43650-A / ISO 4400


Characteristics : The devices function via the principle of a spring-supported paddle, and the magnetic triggering of a micro switch.

Handling and operation :

  • Include straight calming section of 5 x DN in inlet and outlet
  • When tightening the union nut, the connection piece must be countered using an open-ended spanner (SW 19).
  • If the media are dirty, install a filter (use magnetic filter for ferritic components).
  • It must be ensured that the values given for voltage, current, and power are not exceeded.
  • When switched on, a load must be connected in series.
  • The el...

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VD Flow Switch
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Technical data

Switch Reed switch
Nominal width DN 15..150
Process connection Flange
Hysteresis Depending on the switching value, minimum 0.3 l/min
Tolerance ±5 % of full scale value
Pressure resistance PN 40 bar
Medium temperature -20..+120°C
Ambient temperature -20..+70°C
Media Water, oils (gases and aggressive media available on request)
Switching voltage Max. 250 V AC
Switching current Max. 1.5 A
Switch performance Max. 50 VA
Protection class 2 - Safety insulation
Ingress protection IP 44
Connection Plug DIN 43650-A / ISO 4400
Materials medium-contact 1.4408, Stainless steel, 1.4571, POM,1.4310, 1.4571, Viton, Klingerit, hard ferrite
Non-medium-contact materials ABS

Details :

  • Highly reproducible
  • Insensitive to dirt
  • DIN flange housing
  • Precise setting of the switching valve by means of a 180o scale / setting diagram


Characteristics : Mechanical flow switch, for fluid media, with no-contact triggering of an adjustable Reed contact. Robust construction in stainless steel material.

Handling and operation :

  • Include straight calming section of 5 x DN in inlet and outlet
  • When tightening the union nut, the connection piece must be countered using an open-ended spanner (SW 19).
  • If the media are dirty, install a filter (use magnetic filter for ferritic components).
  • It must be ensured that the values given for voltage, current, and power are not exceeded.
  • When switched on, a load...

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VL Flow Switch
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Technical data

Nominal width DN 15..25
Process connection Female thread G 1/2..G 1
Tolerance ±5 % of full scale value
Pressure resistance PN 10 bar
Medium temperature -20..+100°C
Ambient temperature -20..+70°C
Media Water (oils, gases and aggressive media available on request)
Switch Reed switch
Switching voltage Max. 230 V AC
Switching current 1 A
Switching capacity 50 VA
Protection class 2 - safety insulation
Ingress protection IP 65
Connection Plug DIN 43650-A / ISO 4400
Non-medium contact materials PC, PA, NBR, nickelled brass
Weight 0.02 kg

Feature : Optionally switching contact

Characteristics : A piston moves in a transparent glass tube, relative to the flow. The position of the float depends on the volume flow (weight force versus resistance to flow), and indicates the flow rate on the scaled glass tube.

Handling and operation :

  • Include straight calming section of 5 x DN in inlet and outlet
  • When tightening the union nut, the connection piece must be countered using an open-ended spanner (SW 19).
  • If the media are dirty, install a filter (use magnetic filter for ferritic components).
  • It must be ensured that the values given for voltage, current, and power are not exceeded.
  • When switched on, a load must be connected in series.
  • The electrical details apply to ohmic loads. Capacitive and induct...

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