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Model-TR-7-UL
UL rated Ground Monitoring System for Tank Trucks
Model-TR-7-UL
From
$
2,238.70
Product Overview
- Conduit Connection 3/4 in NPT Female
- Construction Type Explosion-proof and intrinsically safe
- Contact Type Grounding Clamp
- Contact Type Note (Grounding clamp) molded polyethylene with beryllium copper contact clips. 16-2 type SO coiled cable; retracts to 3´, extends to 16´
- Ground Strap 2 supplied. Order a pair for each truck
- Height 10.375 in
- Length 5.625 in
- Materials Copper free aluminum
- Mounting 7/16˝ Mounting lugs, Integrally cast
- Operating Temperature, Max 104 °F
- Operating Temperature, Min -13 °F
- Series ID Model-TR-7-UL
- Supply Power Note 105-125 VAC, 60 Hz. 7.75 watts - with light, 1.75 watts - without lights. Optional 220-240 VAC, 50/60 Hz
- Supply Power Type AC
- Switch Rating 10 A @ 125 Vac
- Switch Type DPDT
- Weight 20 lb
- Weight Note 20 lb with contactor and cord
- Width 6.625 in
- Wiring/Connector Table Terminal Strip
Supported Applications
The Dwyer Series TR-7 SAFE-T-GROUND is a ground and continuity control system designed for truck grounding applications. The device ensures safe grounding during loading operations to prevent static discharge hazards. It operates by monitoring the connection between a contactor handle and grounding studs on a vehicle, utilizing an internal relay system with optional pilot lights to indicate grounded or ungrounded status.
Operating Conditions & Performance
The TR-7 unit requires rigid mounting near the truck grounding location under a protective canopy. The enclosure is not waterproof and must be kept dry during operation. Power supply requirements are 105–125 VAC, connected via terminals designated for input (Terminals 7 and 8) with a green earth ground wire connection at Terminal G.
The system provides relay outputs through two sets of contacts:
- Relay #1: Terminals 1 (N.O.), 2 (Common), 3 (N.C.)
- Relay #2: Terminals 4 (N.O.), 5 (Common), 6 (N.C.)
The unit does not ground the loading structure or equipment; it monitors continuity between the truck and a grounding point.
Mechanical Specifications
- Overall Dimensions: Height 8 [203.20], Width 6-5/8 [168.28], Depth 5-5/8 [142.88]
- Electrical Connection: 3/4 FEMALE NPT CONDUIT CONNECTION
- Cord Connector Type: Mil-Spec cord connector (Part #4G)
Configuration Options
The series supports various configurations through a range of accessories and replacement parts. The system is designed to be used with specific contactor handles connected to grounding studs on the truck.
- Contactors: Stud type (#4, #4A) or Battery type (#4B, #4C). Note: The 'Battery Clamp' type Contactor (P/N 84-200615-00) is for temporary use only and should be replaced with a 'Stud Type' Contactor when grounding studs are fitted.
- Cords: Coiled cord options include standard length (#4F, 15 ft) or extended length (#4F-X, 30 ft).
- Grounding Studs: Brass grounding studs (#4H, two required per truck) and Temporary grounding stud assembly (#4H-T).
- Circuit Replacement: ICC-7 (TR-7 internal chassis circuit complete assembly).
The series includes multiple SKUs representing different configurations of the base unit, including models TR-7, TR-7-B, TR-7-L, and variations with suffixes such as -U, -X, and combinations thereof.
Key Product Differences
Variants in the Model-TR-7-UL series differ by specific accessory inclusion or configuration options denoted by model suffixes. The base unit (TR-7) serves as the core ground monitoring system, while other variants may include integrated pilot lights or different relay configurations.
- Model Suffixes: Variants such as TR-7-B, TR-7-L, and combinations like TR-7-XBL indicate specific feature sets available within the series envelope.
The system requires that components not be substituted or adjusted; specifically, the slider resistor must not be adjusted. The 'Battery Clamp' type contactor can be clamped to an unauthorized ground if used improperly, which defeats the purpose of the TR-7 SAFE-T-GROUND system.
PDFs & Manuals
