P a g e | 2
Phone (609) 259-2626 | Fax (609) 259-0044 | Email info@specialtechnicalservices.com | specialtechnicalservices.com
Description
The STS 300 Series Electronic Indicating Ground Assembly consists of an electronic assembly housed in a
cast aluminum enclosure of explosion-proof and dust-ignition-proof design. A 15-100 ft length of flexible cord
with a clamp is attached to the exterior of the device for making a connection to tanker trucks, drums, or other
vessels. A coiled cord is also available for easier cord management. The monitoring ground integrity circuit is
intrinsically safe for Class I, Group D; Class II, Groups E, F, and G hazardous locations.
The STS 300 will indicate a proper ground has been established on a vehicle or drum for the handling of
hazardous materials such as flammable liquids like gasoline or products that generate dust. The ground clamp
will also safely dissipate any unwanted static charge. The STS 300 provides permissive control with pumps
and control circuits to inhibit the transfer of these materials unless a proper earth ground is established.
Model Designation
The STS 300 has many different options, and each system is marked on the front nameplate designating its
specific configuration. The following is an example of how to interpret the model number:
G = STS 300 Series Electronic Indicating Ground Assembly
2 = Voltage (2=120VAC, 4=240VAC, 12=12VDC, 24=24VDC)
L = Indicator Light Type (L=LED, I=Incandescent)
C = Cable Type (C=Coil, S=Straight)
25 = Cable Length (in Feet)
KA = Clamp Style
-XXX = Any additional options or accessories
Installation
The STS 300 Series Electronic Indicating Ground Assembly is fully assembled and tested prior to shipment.
Installation requires mounting, connecting power conductors, and auxiliary control circuits (if used). Installation
of this equipment should be performed by a licensed and qualified person and according to all applicable
requirements and codes of the country of installation.
Mounting
Four 5/16”-18 mounting holes are provided on the back of the enclosure to secure to a Unistrut type support.
The optimal height of the installation is eye-level of the operator, with the indicator lights easily visible to the
operator. A seal fitting (not included) is required immediately before the supply conduit enters the top of the
enclosure. After wiring and testing, the seal fitting is required to be filled with the proper sealing compound.
Failure to do so could result in vapors and liquids being able to enter the enclosure causing damage, explosion,
and bodily harm. The (14) 5/16”-18 bolts that secure the cover should be torqued to 11 ft-lb (1.24 N/m).
Keep cover tightly closed when circuits are energized!
ALWAYS disconnect power and ventilate area before opening enclosure!
To Next Page
Loading...