A
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Level Gauge
Type SNK
Characteristics
Visual / electrical uid level indication in hydraulic reservoirs
with maximum tank pressures not exceeding 2 bar / 29 PSI
Nominal Sizes and Designs
§ 6 nominal sizes from 127 mm / 5.00 in to 381 mm / 15.00 in
§ Display either undivided (SNK-127 ... 176) or subdivided
by strut(s) into 2 (SNK-254) or 3 sections (SNK-305 and
SNK-381)
Media Compatibility
§ Suitable for use with mineral and petroleum based
hydraulic uids (HL and HLP)
Materials
§ Housing made of Aluminium, black powder-coated
§ Sight tube and plugs made of Polyamide (PA)
§ Float made of Polyamide (PA)
§ Sealings made of FKM (Viton®)
For the individual components of the level gauge (sight glass,
housing, sealings, bolts), alternative materials for improved
UV or chemical resistance, low-temperature applications
down to -50°C / -58 °F and use with special media (such as
bio-degradable uids, diesel oils, gasolines) are available on
request.
Electrical Specications
§ Magnetic oat activates switch when uid level drops below
contact level within 60 mm / 2.36 in of lower banjo bolt
§ Available as a break contact (normally closed) or make
contact (normally open)
§ Either equipped with industrial standard connector (types
C / O) or ve-pin circular connector M12 (types CD / OD)
§ Direction of the electrical contact box (right / left) can be
chosen when assembling the electrical contacts (types C / D)
or is right by default (types CD / OD)
§ Contact ratings: max. 10 W (types C / CD) or 5 W (types O / OD)
§ Switching voltage: max. 50 V AC/DC
§ Switching current: max. 0,25 A
Technical Data
§ IP 65 protection rating: Dust tight and protected
against water jets (IP 67 on request)
§ Operating temperature range:
-30 °C ... +80 °C / -22 °F ... +176 °F
§ Recommended tightening torque: 8 N·m / 5.9 ft·lb
§ Minimum lateral distance to other magnetic
components and cables: 10 mm / .39 in
Accessories / Options
§ Dial thermometers with probe and a Celsius or a dual Celsius /
Fahrenheit scale with a temperature display range of up to
+100 °C / +200 °F
§ Thermo Switches
§ Temperature Sensors
§ Deutsch Adaptor Cable
Please see pages 18 / 19 / 20 for details.
Dimensions
Nominal Size
Dimensions
(mm
/
in)
A B1 B2 C (Max.) D E F (with T1) F (with T2) L1 L2 L3
SNK-127
56 34,5 ~50 8 35,1 51,5 157,5 257,5 205 127 ~60
2.20 1.36 ~1.97 .32 1.26 2.03 6.20 10.14 8.07 5.00 ~2.36
SNK-150
56 34,5 ~50 8 35,1 51,5 157,5 257,5 228 150 ~60
2.20 1.36 ~1.97 .32 1.26 2.03 6.20 10.14 8.98 5.91 ~2.36
SNK-176
56 34,5 ~50 8 35,1 51,5 157,5 257,5 254 176 ~60
2.20 1.36 ~1.97 .32 1.26 2.03 6.20 10.14 10.00 6.93 ~2.36
SNK-254
56 34,5 ~50 8 35,1 51,5 157,5 257,5 332 254 ~60
2.20 1.36 ~1.97 .32 1.26 2.03 6.20 10.14 13.07 10.00 ~2.36
SNK-305
56 34,5 ~50 8 35,1 51,5 157,5 257,5 383 305 ~60
2.20 1.36 ~1.97 .32 1.26 2.03 6.20 10.14 15.08 12.00 ~2.36
SNK-381
56 34,5 ~50 8 35,1 51,5 157,5 257,5 459 381 ~60
2.20 1.36 ~1.97 .32 1.26 2.03 6.20 10.14 18.07 15 ~2.36
Connection Details and Electrical Functions
Types C and O: Industrial standard connector (contact gap:
11 mm / .43 in), similar to DIN EN 175301-803-B / ISO 6952
Types CD and OD: Five-pin circular connector M12,
A-coded, according to IEC 61076-2-101
Type C Type O
Contacts close
when uid level
drops below
contact level
Contacts open
when uid level
drops below
contact level
A
B1
L2
D
C
E F
Dial Thermometer with
Probe T1/T2 (optional)
B2
L3
Contact Level
Table shows dimension L1 for the version with industrial standard connector (types C and O) only.
Maximum admissible tolerance for the bolt center spacing (dimension L2) according to DIN ISO 2768-f: ±0,20 mm / .008 in for all nominal sizes.
PG9
Connection 3 not engaged
~50
(~1.97)
28
(1.10)
M12
28
(1.10)
~55
(~2.17)
25
(.98)
Analog
Signal
24 V D C
0 V D C
Connection 1 not available
Connection 2 not engaged
f Banjo Bolt Size
Metric ISO thread M12 (standard option) 12
Metric ISO thread M10 10
Unied coarse thread 1/2–13 UNC U1
Unied ne thread 1/2–20 UNF U2
Unied extra-ne thread 1/2–28 UNEF U3
g Thermo Switch / Temperature Sensor /
Anti-Drain Valve Option
Supplied without Thermo Switch / Temperature Sensor /
Anti-Drain Valve
-
Thermo Switch TS-SNA/SNK; Break contact
(normally closed); Equipped with standard connector
0
Thermo Switch TS-SNA/SNK; Break contact
(normally closed); Equipped with connector M12
OD
Thermo Switch TS-SNA/SNK; Make contact
(normally open); Equipped with standard connector
C
Thermo Switch TS-SNA/SNK; Make contact
(normally open); Equipped with connector M12
CD
Temperature Sensor TS-SNA/SNK-PT100;
Equipped with connector M12
PT100
Anti-Drain Valve Set A DA
Anti-Drain Valve Set B DB
Thermo Switches / Temperature Sensors only available for
banjo bolt size M12. Please see pages 18 to 20 for details.
h Switching Temperature
Contact switches at +60 °C / +140 °F 60
Contact switches at +70 °C / +158 °F 70
Contact switches at +80 °C / +176 °F 80
Contact switches at +90 °C / +194 °F 90
Only to be indicated when using a Thermo Switch.
Options T1C/CF and T2C/CF are not available for
banjo bolt size M10 and not be used in conjunction with
Thermo Switches or Temperature Sensors.
Please see page 18 for details.
Order Codes
a Type
Level Gauge with visual / electrical
uid level indication
SNK
b Nominal Size
SNK-127 (nominal size of 127 mm / 5.00 in) 127
SNK-150 (nominal size of 150 mm / 5.91 in) 150
SNK-176 (nominal size of 176 mm / 6.93 in) 176
SNK-254 (nominal size of 254 mm / 10.00 in) 254
SNK-305 (nominal size of 305 mm / 12.00 in) 305
SNK-381 (nominal size of 381 mm / 15.00 in) 381
Contact STAUFF for alternative nominal sizes and designs.
c Sealing Material
FKM (Viton®) V
d Electrical Function
Break contact, opens at contact level
(normally closed); Equipped with standard connector
0
Break contact, opens at contact level
(normally closed); Equipped with connector M12
OD
Make contact, closes at contact level
(normally open); Equipped with standard connector
C
Make contact, closes at contact level
(normally open); Equipped with connector M12
CD
e Thermometer Option
Supplied without thermometer (standard option) 0
Dial thermometer with probe (200 mm / 7.87 in)
and a Celsius scale up to 100 °C
T1C
Dial thermometer with probe (300 mm / 11.81 in)
and a Celsius scale up to 100 °C
T2C
Dial thermometer with probe (200 mm / 7.87 in)
and a dual scale up to 100 °C / 200 °F
T1CF
Dial thermometer with probe (300 mm / 11.81 in)
and a dual scale up to 100 °C / 200 °F
T2CF
Clearance Hole:
Ø13 (Ø.51) for M12 /
Ø10,5 (Ø.41) for M10 /
Ø13,5 (Ø.53) for UNC, UNF, UNEF
L1 ( )
+1
-4
+.039
-.157
33
(1.30 )
+1
-4
+.039
-.157
SNK - 127 - V - C - O - 12 - O - 60
Catalogue 10
§
Edition 08/2019
Fluid Level and Temperature Indicators
Dimensional drawings: All dimensions in mm (in).