Fox K4 User manual

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
/
min1): 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: 334
44 44 45 55 56 65 53 3(P 77) 33(P 77) 444 4
Signal condition: D means setting for lowering pressure; Umeans 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, 106cycles 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: 33External screw; 44Internal screw; 55Internal screw, protected by a safety cap; 66External gear; 77Knob
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
M1÷12 M 150
Z20÷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
M1÷12 M 150
Z20÷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. [phone] – Fax [phone]
http://www.fox.it e-mail:[e-mail] 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.

3. COMPATIBILITY AND TECHNICAL DATA OF ELASTOMERS AND GASKETS
3.1 During the assembling, always protect the elastomer (if present) with grease.
3.2 Hereunder the table of fluids compatibility and the min/MAX temperatures of the standard gaskets supplied by FOX s.r.l.
WARNING!
• Never try to repair gaskets • Before disposing of gaskets, verify the leaking cause. Perhaps the problem is different.
• Replace gaskets after five operating years • Elastomers are special non toxic littering.
Tab. 2
FOX s.r.l
SYMBOL ISO SYMBOL ELASTOMER DESCRIPTION ELASTOMERS TEMP. RANGE FLUIDS COMPATIBILITY
- NBR Acrylonitrile, Butadiene -40°C ÷ +120°C Very good resistance to mineral and animal fats and oils, aliphatic hydrocarbons. Resistant to alkali. Not suitable for
use with amines, ketones, esters, benzene ethers, chloridated solvents and concentrated acids.
E EPDM Ethylene-Propylene Diene -30°C ÷ +110°C Very good resistance to heat, atmospheric agents; long life and good performance. Very good compatibility with acids,
alcohols, ketones and esters. Bad resistance to oils and fats.
T PTFE Polytetrafluorethylene (Teflon®) -50°C ÷ +150°C Very good resistance to heat and to almost any chemical aggression; not suitable for use with dichlorobenzene,
dietilamine, fluorite, gold cyanide, vaseline.
V FPM Fluorine elastomer (Viton®) -20°C ÷ +140°C Very good resistance to heat, oils and silicon-based fats, aliphatic and dying hydrocarbons, gasoline, diesel, vinegar,
phenol, chloride, nitric and sulfuric acids, cleaners, ethylene glycol, plating solutions.
NOTE: Min and max limits of temperature are shown in Tab.1 as min/MAX (°C) working temperature, TS. The temperature supported by elastomer will always be equal or higher than the equipment
one. For detailed information on chemical compatibility between fluids and elastomers, write to Manufacturer, FOX s.r.l. communicating the exact symbol of the fluid in use and the working temperature.
4. CONNECTIONS WIRING
4.1 All the connections satisfy DIN 43650 Directions. The wiring must be performed by clean hands (not grease stained), by qualified staff, in a clean room; after fixing, check
with a tester the signal quality; protect contacts with specific silicon based grease; tighten the screw; always leave slightly loosen the threads in the connector and tighten the
cable clamp.
4.2 In the following table are shown the detailed projects of two standard connections used commonly by FOX s.r.l.
Fig. 1
P2 ELECTRICAL CONN. M2 ELECTRICAL CONNECTION M3 ELECTRICAL CONNECTION EXPLOSE FOR CONNECTIONS TYPE M2 AND M3
1 -Gasket
2 -Contacts hld grp.
2a-Contacts holder
2b-Contact
3 -Binding screw
4 -Protection
5 -Screw press
6 -Washer
7 -Cable clamp
8 -Fixing screw
NOTE: Electrical protection according to DIN 40050 Directions - IP54 with protection cap for P2, IP65 for M2 and M3.
Fig. 2
5. EQUIPMENT FIXING
5.1 The gasket seat (side implantation) must be
void of defaults: rust free surface and integral
thread. Apply some grease for elastomers and
screw the equipment in its place side installation
(see table aside, Tightening coupling). The use of
a dynamometric key becomes capital with less
resistant material, as aluminium, brass and AISI
316. Always use recommended tools to prevent
warrant exclusion.
5.2 The same procedure must be used in
presence of adaptors male-, female- or flange-
connected.
TIGHTENING COUPLING (Nm) FEMALE CONN. MALE CONN. K7 AND K9 ADAPTER
FOX s.r.l. can supply on demand many hydraulic adapters, even upon Customer’s project.
As these items may vary considerably, the matter won’t be discussed in this Handbook, but all details
are explained in the drawing that Manufacturer sends for approval.
MATERIALS 10x1 1/8” 1/4”
Steel 20 20 30
AISI 316 15 15 20
Brass 7.5 7.5 15
Aluminium 6.2 6.2 12.5
-Tightening coupling values change
depending of the thread width, not on
thread type: the loading difference due
to thread type is meaningless, while it’s
relevant depending of the used material.
-Always take into account a ±10%
tolerance on the values shown.
6. PRESSURE TEST (PT)
6.1 Before joining the connection to the equipment, it’s highly recommended to produce an hydraulic test to verify that the equipment body is installed correctly on the plant. The
necessary pressure, PT, according to the ruling Directive, is calculated as PT=PS (bar) x 1.43, where PS means plant max. admissible pressure, and 1.43 is the minimum
coefficient shown by 2014/68/UE Directive. Two can be the fluid leaking reasons:
Leaking through the equipment thread (external leaking); in this case, check if the equipment is correctly tightened, the bearing seat is free from manufacturing scraps and
the gasket is insert in its place.
Leaking through the diaphragm/piston (internal leaking); in this case, contact as soon as possible the Manufacturer, to obtain the replacement of the product under warranty.
Don’t try to repair or manipulate the instrument, as this could cause the warranty withdrawal.
7. LINK CONNECTOR - PRESSURE/VACUUM SWITCH
7.1 Check that contacts are clean and rust free: they must appear metal colored and polished; during the insertion, the connector should not be forced, and it should enter
thoroughly in its seat. At this moment tighten the screw in the center of the connector: the pressure switch is now installed and linked. Fig. 3
8. SETTING OF ELECTROMECHANICAL PRESSURE SWITCHES
Fig. I When electrical connectors 16x16 and 30x30 (called M2, M3) are placed at the top of the equipment, the setting can be
performed removing the fixing screw of the connector, and introducing in the hole a 2mm hexagonal spanner which will locate the
setting grub screw put inside of the equipment.
Fig. II For series K9, the setting can be performed turning clockwise the anodized aluminum gear to increase, and anti-clockwise to
decrease the value. For all other mechanical pressure switches by FOX s.r.l., the setting of the operating point can be performed
working on a knob, a screw or a grub screw put on the top of the equipment.: turning clockwise, the pre-loading of the spring increases,
while it decreases when turning anti-clockwise.
Each mechanical pressure switch has its own regulation range. The equipment works at its best when the setting value is in the central
part of the range.
8.1 Check by a tester the signal quality. For a longer electrical life, it’s strongly recommended to supply a steady voltage rating and to
keep always an eye to the data shown in Tab. 1 (WORKING); it’s important to not exceed them.
8.2 Temperature and ageing of the equipment affect the intervention precision; this condition can compromise the repetition of the
settled signal. It’s recommended to perform a fine setting at full rating, and to replace the equipment when the intervention precision
exceeds the tolerance percentage shown in Tab. 1 (Working).
9. MAINTENANCE
There’s no need of maintenance. In case of shock or breaking, the Manufacturer supplies technical assistance and spare parts; contact in writing the FOX s.r.l. Post-Sale
Assistance. It’s strongly recommended to use only original spare parts.
10. GUARANTEE
The product is under warranty, provided that all preceding conditions are met. The Manufacturer cannot be held responsible for accidental damage to persons, animals or goods
caused by improper or irresponsible use of the equipment.
FOX s.r.l. via Romagna, 6 – 20090 Opera (MI) – Italy - tel. [phone] – Fax [phone]
http://www.fox.it e-mail:[e-mail] Page 2 of 2
Fig. I Fig. II