ST-22445 Gems Sensors Inc, ST-22445 Datasheet
ST-22445
Manufacturer Part Number
ST-22445
Description
SAF PAK 95-135 VAC
Manufacturer
Gems Sensors Inc
Datasheet
1.ST-22445.pdf
(2 pages)
P/N 54477
Rev. AE
D. Whenever possible, the actual measured parameters should be used in making
E. Shielded cable is not required; but if used in the application, the shield must be
F. Non-intrinsically safe wiring cannot be run in conduit or open raceways together
G. Refer to Fig. 8 for detailed connection to terminal studs. All hardware, including
H. Fusing of the SAFE-PAK to be in accordance with Fig. 1. Fuse F1 to be 6 amps
I. Protective cover (supplied) must be in place over sensor-connected terminals of
Example (Cont.)
Because of the low sensitivity of the device, maximum lead length is limited to a total switch
lead resistance of 200 ohms.
returned to ground - the same as the PAK mounting bracket.
with intrinsically safe wiring.
terminal lugs, is supplied with unit.
the PAK after wiring has been completed (See Fig. 9)
"slo-blo". 120 VAC for 120 V line voltage; 250 VAC for 240 volts.
the determination of allowable length.
Mounting of Protective Cover over Sensor-Connected Terminals of Unit
Cover
Stud
Terminals
LATCHING SAFE-PAK
Recommended Method of
Anti-Vibrational
GROUP
A & B
Lockwasher
C
D
HEX
Nut
Stud Nuts
CAPACITANCE
Nylon
1 uf
1 uf
1 uf
Connection to Electrical Terminals
Fig. 9
Fig. 8
INDUCTANCE
Cover
(Closed-Ring Type)
Stud
Terminals
Tighten Assembly to Between
3 and 5 In. Lbs.
All terminal hardware (including
lug) supplied with unit.
.50 mh
.50 mh
.50 mh
Terminal Lug.
Terminal Stud
SAFE-PAK
Notes
Stud Nuts
Nylon
*** Warning: To prevent ignition of flammable or combustible atmospheres, disconnect
For use as an "intrinsically safe switch circuit" and in hazardous locations with non-
voltage producing sensors. When SAFE-PAK installation is in accordance with this guide,
these field sensors are suitable for Class I; Divisions 1, 2; Groups A, B, C and D and Class
II; Division 2; Groups E, F and G, as defined by Article 500 of the National Electric Code.
IMPORTANT!
PAK, Latching SAFE-PAK or HI-LO PAK units.
1. Associated Equipment - Caution: The SAFE-PAK must be mounted outside the
hazardous area. Only the switch or sensor terminals provide an intrinsically safe
switch circuit (see Fig. 1, Fig. 2, Fig 3 or Fig. 4). [Exia] means associated equipment:
"Appareillage connexe", located in safe area.
For 120V application,
only one fuse is required
in the ungrounded circuit
of the input line.
power before servicing.
N o t e
N.O. Dry
N.O. Dry
( L o w )
(High)
Read carefully and completely before installing or connecting SAFE-
Connection Diagram: Gems SAFE-PAK Models
Hazardous
Location
Circuit for Pump-Down Operation
S2
S1
Input
VAC
SAFE-PAK Models 22445, 25872, 25873
Latching SAFE-PAK Models 41705, 41715
HI-LO PAK Models 38705, 38710, 38715, 38720
FUSE F1
Non-Hazardous
FUSE F1
Sensor Switch
Fig. 2.
Location
Fig. 1.
Com
Off
On
Instruction Bulletin No. 54477
SAFE-PAK
SAFE-PAK
Latching
A
C
L
O
A
D
Load
LOAD
Fuse F1
Hazardous
Non-Hazardous
Location
[Exia]
Location
VAC (Hot)
Com
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ST-22445 Summary of contents
Page 1
... D. Whenever possible, the actual measured parameters should be used in making the determination of allowable length. E. Shielded cable is not required; but if used in the application, the shield must be returned to ground - the same as the PAK mounting bracket. F. Non-intrinsically safe wiring cannot be run in conduit or open raceways together with intrinsically safe wiring ...
Page 2
... Example: Typical values of capacitance for a twisted pair of copper wires is between 20 and 60 pf per foot. Inductance of a typical twisted pair is between 0.10 and 0.20 uh/ft., thus making a cable run in this example essentially determined by the inductance. ...