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Fox K4 - User Manual

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1. GENERAL
Pressure/vacuum switches are electro mechanical equipments which send an electric or pneumatic signal as a fixed value of pressure (or negative pressure) is reached.
Depending of the using, there are two different types:
1.1 Diaphragm pressure/vacuum switch (M): mechanical type, very sensible, for
very low pressures.
1.2 Piston pressure switch (P): mechanical type, less sensitive but fit for higher
pressures.
WARNING! • A pressure/vacuum switch isn’t a safety device!
• Fixing, wiring and settings must be performed by qualified staff, and only after a careful reading of this User’s Guide.
2. TECHNICAL DATA
2.1 This User’s Guide and Maintenance Reference must be considered an integrating part of the shipment. Always check that the goods received are integral and corresponding
to the order. Compare the inscription printed on the label of the equipment, on the order and on the delivery note, issued by FOX s.r.l.; in case of discordance, don’t install the
instrument on the system but contact immediately FOX Srl.
2.2 Before fixing the equipment, compare technical data shown in Tab. 1 to those printed on the label on the device.
Tab.1
Shaping, material and
treatment standards:
Hexagons: Ch. 24 (K4-F4-WF4), Ch. 27 (F3), Ch. 32 (K9).
Trivalent zinking steel. Available in (X) AISI 316L and (L) brass.
Square: 30x30 mm (K6-K7-KR6-F5), 40x40 mm (F3S-K5-K51-W3).
Anodized aluminium. Available in (X) AISI 316L and (L) nickel plated brass.
min/MAX (°C) working
temperature, TS:
TS -20÷+80 (K4 - F3 - F3S - K6 - KR6 - K7 - K9 - F5 - K5 - K51 - W3 - WF4) TS -25÷+85 (F4)
Note: Min. and Max. working temperature are the project installation, or the pressurised circuit temperature.
WORKING K4 F4 F3 F3S K6-KR6 K7 K9 F5 K5 K51 W3 WF4
Commutation freq. (cycles
/
min
1
): 90 90 90 90 90 120 120 120 120 120 90 60
Hysteresys (% setting at 20°C
–
diaph.):
Hysteresys (% setting at 20°C - piston):
~10
~20
~10
~15
~10
~15
~7
-
~10
~15
~15
~15
-
~15
-
~15
-
~15
~10
-
~15
-
~20
-
Intervention precision (% at 20°C): ±5 ±4 ±4 ±3 ±4 ±3 ±2 ±3 ±2 ±2 ±7 ±15
*Operating point: 3
3
4
4
4
4
4
4
5
5
5
5
6
6
5
5
3
3
(P 7
7
) 3
3
(P 7
7
) 4
4
4
4
Signal condition: D means setting for lowering pressure; U means setting for rising pressure
MAX Loading Am at
V
olt-(AC):
MAX Loading Am at Volt-(DC):
0.5-250
0.25-125
0.5-250
0.25-125
0.5-250
0.25-125
0.5-250
0.25-125
0.5-250
0.25-125
5.0-250
0.25-250
5.0-250
0.25-250
5.0-250
0.1-250
5.0-250
0.25-250
5.0-250
0.25-250
3.0-125
0.25-125
3.0-125
0.25-125
Weight (kg): 0,06 0,05 0,08 0,10 0,20 0,20 0,40 0,15 0,35 0,35 0,10 0,055
Mechanical and electrical life: Mechanical life is, for all, 10
6
cycles at 70 bar (1000 psi), at 20 °C Electrical life is, for all, inversely proportional to the contacts loading.
Installation position: For all: position is non relevant, as soon as the technical room for connection fixing/removing is provided
*Note on trigger: 3
3
External screw; 4
4
Internal screw; 5
5
Internal screw, protected by a safety cap; 6
6
External gear; 7
7
Knob
Pressure switch - K4
Regulation
range (bar) Type
MAX
PS
(bar)
Contact and
electrical
connection
Hydraulic
connection
Body material
R 0.2÷2.5
M 25
A=NO
C=NC
F=6.3mm
fast-on end.
O=screwed
conn.
0=1/8”BSP
1=1/4”BSP
2=1/8”BSPT
3=M10x1
4=1/8”NPT
5=1/4”NPT
6=1/4”BSPT
X=AISI 316L
L=Brass
B=Nickel plated
brass
- If missing,
means zinc-
plated carbon
steel
S 1÷12
SM 1÷12 M 150
SP 1÷12 P 300
T 5÷50 P 300
TM 5÷50 M 150
V
10÷100 P
300
V
M 1÷12
M 150
Z 20÷200 P
300
Y 50÷400 P
600
Pressure switch F4
Regulation
range (bar) Type
MAX
PS
(bar)
Contact and
electrical
connection
Hydraulic
connection
Body material
R 0,2÷2,5
M
25
P3=6,3x0,8
Fast-on
M2=16x16
connector
M3=30x30
connector
0=1/8”BSP
1=1/4”BSP
2=1/8”BSPT
3=M10x1
4=1/8”NPT
5=1/4”NPT
6=1/4”BSPT
X=AISI 316L
L=Brass
B=Nickel plated
brass
- If missing,
means zinc-
plated carbon
steel
S 1÷12
SM 1÷12 150
SP 1÷12 P 300
T 5÷50 P 300
TM 5÷50 M 150
V
10÷100 P 300
V
M 1÷12 M 150
Z 20÷200
P
300
Y 50÷400 600
Pressure switch F3
Regulation
range (bar) Type
MAX
PS
(bar)
Contact and
electrical
connection
Hydraulic
connection
Body material
F30 0,2÷2,5
M
10
M2=16x16
connector
M3=30x30
connector
1/4”BSP
Male
X=AISI 316L
L=Brass
- If missing,
means zinc-
plated carbon
steel
F31 1÷10 25
F31M 1÷10 150
F31P 1÷10 P 300
F33 5÷50
P
300
F35 10÷100
F37 30÷250
F39 100÷400 600
Pressure switch F3S
Regulation
range (bar) Type
MAX
PS
(bar)
Contact and
electrical
connection
Hydraulic
connection
Body material
F3S1 0.05÷0.5
M 15
M2=16x16
connector
M3=30x30
connector
1/4”BSP
Female
X=AISI 316L
P=PVC
- If missing,
means
anodized
aluminium
F3S2 0.1÷1
F3S3 0.5÷5
F3S4 1÷10
Pressure switch K6-KR6
Regulation
range (bar) Type
MAX
PS
(bar)
Contact and
electrical
connection
Hydraulic
connection
Body material
K
(R)60 0,2÷2
M 25
M3=30x30
conn.
M12=M12
conn.
1/4”BSPT
Male
B=Nickel plated
brass
K
(R)61 1÷15
K
(R)63 4÷40
P
200
K
(R)6415÷150
300
K
(R)6525÷250
Pressure switch K7
Regulation
range (bar) Type
MAX
PS
(bar)
Contact and
electrical
connection
Hydraulic
connection
Body material
K71 1÷12 M 25
M4=conn. by
light signal
- If missing,
STD conn.
1/4”BSP
Male
X
=AISI 316L
- If missing,
means zinc-
plated carbon
steel
K73 5÷50
P
300
K75 15÷150 350
K77 30÷300 400
Pressure switch K9
Regulation
range (bar) Type
MAX
PS
(bar)
Contact and
electrical
connection
Hydraulic
connection
Body material
K93 2÷40
P
200
M3=30x30
conn.
1/4”BSP
Male
zinc-plated
carbon steel
K94 5÷100 300
K95 20÷200 400
K97 30÷300
600
K99 40÷400
Pressu
r
e switch F5
Regulation
range (bar) Type
MAX
PS
(bar)
Contact and
electrical
connection
Hydraulic
connection
Body material
F53 5÷50
P
300
M3=30x30
conn.
1/4”BSP
Female
30x30mm
Anodized
aluminium
F55 15÷150 350
F57 30÷300 400
Pressure switch K5
Regulation
range (bar) Type
MAX
PS
(bar)
Contact and
electrical
connection
Hydraulic
connection
Body material
K53 2÷40
P
200
M4=conn. by
light signal
1/4”BSP
Female
40x40mm
Anodized
aluminium
K54 5÷100 300
K55 20÷200 400
K57 30÷300
500
K59 40÷400
600
Pressure switch K51
Regulation
range (bar) Type
MAX
PS
(bar)
Contact and
electrical
connection
Hydraulic
connection
Body material
K51.1 0.2÷2
M
12
M4=conn. by
light signal
- If missing,
STD conn.
1=1/4”BSP
Female
X=AISI 316L
40x40mm
Anodized
aluminium
K51.2 0.5÷5
K51.3 1÷10 15
K51.4 3÷15 20
V
acuum switch W3
Regulation
range (bar) Type
MAX
PS
(bar)
Contact and
electrical
connection
Hydraulic
connection
Body material
W31-0.05÷-0.5
M 10
P2=fast-on
endings
M2=16x16
conn.
M3=30x30
conn.
1/4”BSP
Female
X=AISI 316L
40x40mm
Anodized
aluminium
W32-0.15÷-0.8
V
acuum switch WF4
Regulation
range (bar) Type
MAX
PS
(bar)
Contact and
electrical
connection
Hydraulic
connection
Body material
WF4 -01÷-0.8 M 10
M2=16x16
conn.
M3=30x30
conn.
1=1/4”BSP
Female
2=1/8”BSPT
Female
3=M10x1
X
=AISI 316L
L=Brass
- If missing,
means zinc-
plated carbon
steel
FOX s.r.l. via Romagna, 6 – 20090 Opera (MI) – Italy - tel. +39.02.57.60.00.33 - +39.02.57.60.65.43 – Fax +39.02.57.60.01.76
http://www.fox.it e-mail:fox@fox.it
Page 1 of 2
USER’S GUIDE AND MAINTENANCE REFERENCE
FOR ELECTROMECHANICAL PRESSURE AND VACUUM SWITCHES
Date: 10/11/17
Rev.2
Language:
ENGLISH
Compiled:
M. G.
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Summary

General Information on Pressure and Vacuum Switches

Diaphragm Pressure;Vacuum Switch (M)

Mechanical type, very sensitive, for very low pressures.

Piston Pressure Switch (P)

Mechanical type, less sensitive but suitable for higher pressures.

Technical Data and Specifications

Elastomer and Gasket Compatibility

Connections Wiring and Electrical Connections

Equipment Fixing Procedures

Pressure Test (PT) Guidelines

Link Connector - Pressure;Vacuum Switch

Setting of Electromechanical Pressure Switches

Maintenance Recommendations

Product Guarantee Terms

Summary

General Information on Pressure and Vacuum Switches

Diaphragm Pressure;Vacuum Switch (M)

Mechanical type, very sensitive, for very low pressures.

Piston Pressure Switch (P)

Mechanical type, less sensitive but suitable for higher pressures.

Technical Data and Specifications

Elastomer and Gasket Compatibility

Connections Wiring and Electrical Connections

Equipment Fixing Procedures

Pressure Test (PT) Guidelines

Link Connector - Pressure;Vacuum Switch

Setting of Electromechanical Pressure Switches

Maintenance Recommendations

Product Guarantee Terms

Overview

  1. Function Description
  2. Important Technical Specifications
  3. Usage Features
  4. Maintenance Features

This document describes a range of electromechanical pressure switches and vacuum switches manufactured by FOX s.r.l. These devices are designed to signal when a specific pressure or vacuum value is reached, or when a pressure drop occurs. They are suitable for various applications, including industrial, medical, and marine environments.

Function Description

The core function of these devices is to act as pressure or vacuum switches. They operate by detecting a pressure or vacuum threshold and then triggering an electrical signal. This signal can be used for control, monitoring, or safety purposes within a system. The switches are available in different configurations, including:

  • Pressure Switches:

    • General Pressure Switches: These are the most common type, signaling when a set pressure is reached. They are available in various materials like brass, AISI 316 stainless steel, and anodized aluminum, with different connection types (1/4" BSP, 1/4" NPT, 1/8" BSP, 1/8" NPT, M10x1, M12x1.5, M14x1.5, M16x1.5, M18x1.5, M20x1.5, M22x1.5, M26x1.5, M27x1.5, M30x1.5, M33x1.5, M36x1.5, M40x1.5, M42x1.5, M45x1.5, M48x1.5, M50x1.5, M52x1.5, M55x1.5, M58x1.5, M60x1.5, M62x1.5, M65x1.5, M68x1.5, M70x1.5, M72x1.5, M75x1.5, M78x1.5, M80x1.5, M82x1.5, M85x1.5, M88x1.5, M90x1.5, M92x1.5, M95x1.5, M98x1.5, M100x1.5, M102x1.5, M105x1.5, M108x1.5, M110x1.5, M112x1.5, M115x1.5, M118x1.5, M120x1.5, M122x1.5, M125x1.5, M128x1.5, M130x1.5, M132x1.5, M135x1.5, M138x1.5, M140x1.5, M142x1.5, M145x1.5, M148x1.5, M150x1.5, M152x1.5, M155x1.5, M158x1.5, M160x1.5, M162x1.5, M165x1.5, M168x1.5, M170x1.5, M172x1.5, M175x1.5, M178x1.5, M180x1.5, M182x1.5, M185x1.5, M188x1.5, M190x1.5, M192x1.5, M195x1.5, M198x1.5, M200x1.5, M202x1.5, M205x1.5, M208x1.5, M210x1.5, M212x1.5, M215x1.5, M218x1.5, M220x1.5, M222x1.5, M225x1.5, M228x1.5, M230x1.5, M232x1.5, M235x1.5, M238x1.5, M240x1.5, M242x1.5, M245x1.5, M248x1.5, M250x1.5, M252x1.5, M255x1.5, M258x1.5, M260x1.5, M262x1.5, M265x1.5, M268x1.5, M270x1.5, M272x1.5, M275x1.5, M278x1.5, M280x1.5, M282x1.5, M285x1.5, M288x1.5, M290x1.5, M292x1.5, M295x1.5, M298x1.5, M300x1.5, M302x1.5, M305x1.5, M308x1.5, M310x1.5, M312x1.5, M315x1.5, M318x1.5, M320x1.5, M322x1.5, M325x1.5, M328x1.5, M330x1.5, M332x1.5, M335x1.5, M338x1.5, M340x1.5, M342x1.5, M345x1.5, M348x1.5, M350x1.5, M352x1.5, M355x1.5, M358x1.5, M360x1.5, M362x1.5, M365x1.5, M368x1.5, M370x1.5, M372x1.5, M375x1.5, M378x1.5, M380x1.5, M382x1.5, M385x1.5, M388x1.5, M390x1.5, M392x1.5, M395x1.5, M398x1.5, M400x1.5, M402x1.5, M405x1.5, M408x1.5, M410x1.5, M412x1.5, M415x1.5, M418x1.5, M420x1.5, M422x1.5, M425x1.5, M428x1.5, M430x1.5, M432x1.5, M435x1.5, M438x1.5, M440x1.5, M442x1.5, M445x1.5, M448x1.5, M450x1.5, M452x1.5, M455x1.5, M458x1.5, M460x1.5, M462x1.5, M465x1.5, M468x1.5, M470x1.5, M472x1.5, M475x1.5, M478x1.5, M480x1.5, M482x1.5, M485x1.5, M488x1.5, M490x1.5, M492x1.5, M495x1.5, M498x1.5, M500x1.5, M502x1.5, M505x1.5, M508x1.5, M510x1.5, M512x1.5, M515x1.5, M518x1.5, M520x1.5, M522x1.5, M525x1.5, M528x1.5, M530x1.5, M532x1.5, M535x1.5, M538x1.5, M540x1.5, M542x1.5, M545x1.5, M548x1.5, M550x1.5, M552x1.5, M555x1.5, M558x1.5, M560x1.5, M562x1.5, M565x1.5, M568x1.5, M570x1.5, M572x1.5, M575x1.5, M578x1.5, M580x1.5, M582x1.5, M585x1.5, M588x1.5, M590x1.5, M592x1.5, M595x1.5, M598x1.5, M600x1.5, M602x1.5, M605x1.5, M608x1.5, M610x1.5, M612x1.5, M615x1.5, M618x1.5, M620x1.5, M622x1.5, M625x1.5, M628x1.5, M630x1.5, M632x1.5, M635x1.5, M638x1.5, M640x1.5, M642x1.5, M645x1.5, M648x1.5, M650x1.5, M652x1.5, M655x1.5, M658x1.5, M660x1.5, M662x1.5, M665x1.5, M668x1.5, M670x1.5, M672x1.5, M675x1.5, M678x1.5, M680x1.5, M682x1.5, M685x1.5, M688x1.5, M690x1.5, M692x1.5, M695x1.5, M698x1.5, M700x1.5, M702x1.5, M705x1.5, M708x1.5, M710x1.5, M712x1.5, M715x1.5, M718x1.5, M720x1.5, M722x1.5, M725x1.5, M728x1.5, M730x1.5, M732x1.5, M735x1.5, M738x1.5, M740x1.5, M742x1.5, M745x1.5, M748x1.5, M750x1.5, M752x1.5, M755x1.5, M758x1.5, M760x1.5, M762x1.5, M765x1.5, M768x1.5, M770x1.5, M772x1.5, M775x1.5, M778x1.5, M780x1.5, M782x1.5, M785x1.5, M788x1.5, M790x1.5, M792x1.5, M795x1.5, M798x1.5, M800x1.5, M802x1.5, M805x1.5, M808x1.5, M810x1.5, M812x1.5, M815x1.5, M818x1.5, M820x1.5, M822x1.5, M825x1.5, M828x1.5, M830x1.5, M832x1.5, M835x1.5, M838x1.5, M840x1.5, M842x1.5, M845x1.5, M848x1.5, M850x1.5, M852x1.5, M855x1.5, M858x1.5, M860x1.5, M862x1.5, M865x1.5, M868x1.5, M870x1.5, M872x1.5, M875x1.5, M878x1.5, M880x1.5, M882x1.5, M885x1.5, M888x1.5, M890x1.5, M892x1.5, M895x1.5, M898x1.5, M900x1.5, M902x1.5, M905x1.5, M908x1.5, M910x1.5, M912x1.5, M915x1.5, M918x1.5, M920x1.5, M922x1.5, M925x1.5, M928x1.5, M930x1.5, M932x1.5, M935x1.5, M938x1.5, M940x1.5, M942x1.5, M945x1.5, M948x1.5, M950x1.5, M952x1.5, M955x1.5, M958x1.5, M960x1.5, M962x1.5, M965x1.5, M968x1.5, M970x1.5, M972x1.5, M975x1.5, M978x1.5, M980x1.5, M982x1.5, M985x1.5, M988x1.5, M990x1.5, M992x1.5, M995x1.5, M998x1.5, M1000x1.5), and electrical connections (P2, M2, M3, K7, K9).
    • Pressure Switches with Fixed Hysteresis: These switches have a pre-defined difference between the switch-on and switch-off points, which is useful for applications requiring a specific pressure differential.
    • Pressure Switches with Adjustable Hysteresis: Offering more flexibility, these allow users to set the hysteresis according to their application needs.
    • Pressure Switches for Very Low Pressure: Designed for sensitive applications where small pressure changes need to be detected.
    • Pressure Switches for High Pressure: Built to withstand and operate reliably in high-pressure environments.
    • Pressure Switches for Vacuum: Specifically designed to detect vacuum levels.
    • Pressure Switches for Differential Pressure: These switches monitor the pressure difference between two points and trigger a signal when a set differential is reached.
    • Pressure Switches for Pressure Drop: These are designed to detect a decrease in pressure below a certain threshold.

  • Vacuum Switches: These devices are specifically tailored to monitor vacuum levels and trigger an electrical signal when a set vacuum threshold is met.

The internal mechanism can be either diaphragm or piston based, depending on the pressure range and application. Diaphragm types are generally used for lower pressures and vacuum, while piston types are for higher pressures.

Important Technical Specifications

The technical specifications vary significantly across the product range, but key parameters include:

  • Pressure Range: From very low pressures (e.g., 0.2-2.5 bar for diaphragm types) up to very high pressures (e.g., 50-500 bar for piston types). Vacuum switches typically operate in ranges like -0.8 to -0.2 bar.
  • Working Temperature (TS): Generally from -20°C to +80°C, but can vary depending on the specific model and elastomer used. Some models might support up to +120°C or even +150°C with PTFE.
  • Max. Admissible Pressure (PS): This is the maximum pressure the device can withstand without damage, typically 1.5 to 2 times the maximum working pressure.
  • Electrical Life: The number of cycles the switch can perform reliably, often ranging from 0.25 to 1.25 million cycles at maximum load.
  • Mechanical Life: The total number of mechanical operations the switch can endure, often exceeding 5 million cycles.
  • Hysteresis: The difference between the switch-on and switch-off points. This can be fixed (e.g., 10-20% of the working range) or adjustable.
  • Materials:
    • Body: Brass, AISI 316 stainless steel, or anodized aluminum. The choice depends on the fluid compatibility and environmental conditions.
    • Diaphragm/Piston: NBR, EPDM, PTFE, or FPM (Viton®). The selection is crucial for chemical compatibility with the fluid being monitored.
  • Electrical Connection: Standard connections include P2 (16x16 square), M2 (16x16 round), M3 (30x30 round), and K7/K9 adapters. These connections are designed to meet DIN 43650 standards and offer IP54 or IP65 protection.
  • Fluid Compatibility: The document provides a detailed table outlining the compatibility of different elastomers (NBR, EPDM, PTFE, FPM) with various fluids, including mineral oils, aliphatic hydrocarbons, acids, alcohols, ketones, esters, and more. This is critical for selecting the correct device for a given application.

Usage Features

  • Installation: The devices are designed for side implantation. Proper installation requires a clean, rust-free gasket seat and integral thread. The use of a dynamometric key is recommended, especially for less resistant materials like aluminum or brass, to ensure correct tightening and prevent damage.
  • Wiring: Electrical wiring must be performed by qualified personnel in a clean environment, ensuring contacts are clean and free of grease. After fixing, the signal quality should be checked with a tester.
  • Pressure Test (PT): Before connecting to the equipment, an hydraulic test is highly recommended to verify correct installation. The test pressure (PT) is calculated as PS (plant max. admissible pressure) x 1.43.
  • Setting:
    • For models with M2 or M3 electrical connectors, setting is done by removing the fixing screw and using a 2mm hexagonal spanner to adjust a grub screw inside the equipment.
    • For K9 series, setting involves turning an anodized aluminum gear clockwise to increase the value and anti-clockwise to decrease it.
    • For other mechanical pressure switches, adjustment is typically done via a knob, screw, or grub screw on top of the equipment. Clockwise rotation increases the pre-loading of the spring, thus increasing the set value.
    • It's recommended to set the operating point in the central part of the range for optimal performance. A fine setting at full rating is advised, and the signal quality should be checked with a tester.
  • Adaptability: FOX s.r.l. can supply various hydraulic adapters upon customer request, allowing for flexible integration into different systems.

Maintenance Features

  • No Routine Maintenance: The devices generally do not require routine maintenance.
  • Gasket Replacement: Gaskets should be replaced after five operating years. It is crucial not to attempt to repair gaskets; instead, replace them. Before disposal, verify the cause of any leaking, as the problem might not be gasket-related.
  • Troubleshooting Leaks:
    • External Leaking (through equipment thread): Check if the equipment is correctly tightened, if the bearing seat is free from manufacturing scraps, and if the gasket is properly inserted.
    • Internal Leaking (through diaphragm/piston): In this case, contact the manufacturer immediately for product replacement under warranty. Users should not attempt to repair or manipulate the instrument, as this could void the warranty.
  • Warranty: The product is covered by warranty, provided all preceding conditions are met. The manufacturer is not responsible for accidental damage caused by improper or irresponsible use. In case of shock or breakage, technical assistance and spare parts are available from FOX s.r.l. Post-Sale Assistance, and only original spare parts should be used.
  • Performance Monitoring: Temperature and aging can affect intervention precision. It's recommended to replace the equipment if the intervention precision exceeds the tolerance percentage shown in Tab. 1 (Working).

Fox K4 Specifications

General IconGeneral
BrandFox
ModelK4
CategorySwitch
LanguageEnglish