
Gems Sensors Inc.Gems Sensors Inc.
Gems Sensors Inc.Gems Sensors Inc.
Gems Sensors Inc.
One Cowles Road
Plainville, CT 06062-1198
Toll-Free: 1-800-378-1600
Return PolicyReturn Policy
Return PolicyReturn Policy
Return Policy
Returns are accepted on stock items up to 30 days from date
of order. You must contact our Returns Department for a
Return Authorization (RA) number. Return the goods - freight
prepaid - in the original container and include original packing
slip.
C. O. D. returns are not accepted. Gems reserves the right to
apply restocking charges.
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Tel: 860-793-4357el: 860-793-4357
el: 860-793-4357el: 860-793-4357
el: 860-793-4357
Fax: 860-793-4563Fax: 860-793-4563
Fax: 860-793-4563Fax: 860-793-4563
Fax: 860-793-4563
InstallationInstallation
InstallationInstallation
Installation (Cont.)
5. Connect VDC (±10%) power to red lead; return (-) to
black lead.
Caution: Do not connect output to VDCCaution: Do not connect output to VDC
Caution: Do not connect output to VDCCaution: Do not connect output to VDC
Caution: Do not connect output to VDC
power without a load.power without a load.
power without a load.power without a load.
power without a load.
6. Output Configuration: See Wiring Diagrams.
• Gems products must be maintained and installed in strict accordance with the National
Electrical Code and the applicable Gems Product Instruction Bulletin that covers
installation, operation and proper maintenance. Failure to observe this information may
result in serious injury or damages.
•For hazardous area applications involving such things as, but not limited to, ignitable
mixtures, combustible dust and flammable materials, use an appropriate explosionproof
enclosure or intrinsically safe interface device.
•Please adhere to the pressure and temperature limitations shown throughout this catalog
for our level and flow sensors. These limitations must not be exceeded. These pressures
and temperatures take into consideration possible system surge pressures, temperatures
and their frequencies.
•Selection of materials for compatibility with the media is critical to the life and operation of
Gems products. Take care in the proper selection of materials of construction, testing is
required.
•NSF-approved sensors are made of materials approved for potable water applications
according to Standard 61.
•Stainless steel is generally regarded as safe by NSF and FDA.
•Life expectancy of switch contacts varies with application. Contact Gems if life cycle testing
is required.
•Ambient temperature changes do affect switch set points, since the gravity of a liquid can
vary with temperature.
•Our sensors have been designed to resist shock and vibration. However, shock and
vibration should be minimized.
•Filter liquid media containing particulate and/or debris to ensure the proper operation of
our products.
•Electrical entries and mounting points in an enclosed tank may require liquid/vaporsealing.
•Our sensors must not be field-repaired.
•Physical damage sustained by product may render it unserviceable.
Important Points:Important Points:
Important Points:Important Points:
Important Points:
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Typical Wypical W
ypical Wypical W
ypical Wiring Diagramsiring Diagrams
iring Diagramsiring Diagrams
iring Diagrams
BlackBlack
BlackBlack
Black Switch
RedRed
RedRed
Red
WhiteWhite
WhiteWhite
White
InputInput
InputInput
Input
PowerPower
PowerPower
Power
+ VDC+ VDC
+ VDC+ VDC
+ VDC
LoadLoad
LoadLoad
Load
+ VDC+ VDC
+ VDC+ VDC
+ VDC
Switch
RedRed
RedRed
Red
WhiteWhite
WhiteWhite
White
Input PowerInput Power
Input PowerInput Power
Input Power
+ VDC+ VDC
+ VDC+ VDC
+ VDC
BlackBlack
BlackBlack
Black
*
**L
O
A
D
Switch
InputInput
InputInput
Input
PowerPower
PowerPower
Power
+ VDC+ VDC
+ VDC+ VDC
+ VDC
LoadLoad
LoadLoad
Load
+ VDC+ VDC
+ VDC+ VDC
+ VDC
RedRed
RedRed
Red
WhiteWhite
WhiteWhite
White
**
BlackBlack
BlackBlack
Black
NotesNotes
NotesNotes
Notes
*TTL/CMOS Output: For levels greater
than 5 volts, a 10K pull-up resistor is
required at the output.
** Maximum Load = 40mA @30 VDC
MaintenanceMaintenance
MaintenanceMaintenance
Maintenance
Sensor may require a periodic cleaning of prism surface.
Chlorinated hydrocarbons must not be used forChlorinated hydrocarbons must not be used for
Chlorinated hydrocarbons must not be used forChlorinated hydrocarbons must not be used for
Chlorinated hydrocarbons must not be used for
cleaning.cleaning.
cleaning.cleaning.
cleaning.
A mild detrgent may be used to clean prism
surface.
DimensionsDimensions
DimensionsDimensions
Dimensions
1/4”NPT Mounting 1/4”NPT Mounting
with 3/8”Conduit 1/2”Straight Thread
Mounting with O-Ring
M12x1-8g Straight
Thread with O-Ring “Fish”Pull Ring
Flange Mounting
Threaded Holes Not Required
Electrical Termination: Lead Wires, 22 AWG, PVC Jacketed, 12”to 14”Extended
Electrical Termination: Lead Wires, 22 AWG, PVC Jacketed, 12”to 14”Extended 25’Cable, 22 AWG, PVC Jacketed
Lead
Wires
2-5/32”
(54.7 mm)
Epoxy
Encapsulated
5/8”HEX
(15.9 mm)
1/4”
NPT
2-5/32”
(54.7 mm)
5/8”HEX
(15.9 mm)
1/4”
NPT 3/8”NPT
Mounting
2-5/32”
(54.7 mm)
5/8”HEX
(15.9 mm)
Viton
O-Ring
1/2”- 20
UNF 2A .47”
Ref.
.47”
Ref.
2-5/32”
(54.7 mm)
5/8”HEX
(15.9 mm)
Viton
O-Ring
M12
x 1-8g ←
→2-5/8”Ref.
(66.7 mm)
Removable PVC
Fish Pull Ring
5/8”HEX
(15.9 mm)
Cable
2.16”Ref.
1/4”Max. Wall Thickness
1/8”Thick
Viton Gasket
11/16”-16 Thd. REF
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