Fisher Labs TW-82P Single-Frequency Digital Underground Line Tracer with Passive Power Detection
Trace Buried Utilities with Active and Passive Detection
The Fisher TW-82P helps utility crews, contractors, and maintenance teams locate and trace buried conductive pipes and cables. Its transmitter operates at 82.175 kHz for active tracing, while Passive Power Mode lets you use the receiver alone to detect 50/60 Hz current on underground lines.
Choose a direct conductive connection when the utility is accessible, or use inductive tracing when a direct connection is unavailable. An optional coupling clamp provides another way to apply a signal without making a metal-to-metal connection.
Key Features
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Active and passive locating: Trace a transmitter signal or detect 50/60 Hz power current with the receiver alone.
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Digital guidance: Visual and audible left/right guidance, signal strength, and over-target indicators help you follow a line.
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Automatic readings: Displays depth and signal current to help assess the traced utility.
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Programmable Lateral Mode: Helps locate weaker lateral lines near a stronger main-line signal.
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Jobsite-ready construction: IP65-rated housing and an operating range of -4°F to 140°F.
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D-cell power: Uses two D-cell batteries in the receiver and four in the transmitter.
Specifications
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Model: TW-82P
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Active frequency: 82.175 kHz
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Passive Power Mode: 50/60 Hz detection
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Transmitter output: 0.25 watt normal; 1.0 watt high
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Receiver battery life: Approximately 80–130 hours, depending on volume setting
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Transmitter battery life: Approximately 130 hours with high-quality alkaline batteries
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Manufacturer warranty: 2 years
Included with the TW-82P
Transmitter, receiver, ground-rod assembly with conductive tracing cables, carrying case, six D-cell batteries, operator’s manual, and calibration certificate.
Important: Passive Power Mode detects current, not voltage. A line with no detectable current may not appear in this mode. Never connect the tracing cables directly to an energized electrical or communication line; use an appropriate inductive method for an in-service line.
The Fisher Labs TW82P is a digital underground line tracer designed for easy and efficient location of conductive lines, such as pipes, cables, and electrical lines. It features a single frequency and one-button operation, ensuring simple usage. The ultra-fast target response system provides quick and accurate location results. Moreover, the transmitter automatically adjusts the output signal to optimize power output based on ground conditions, using load impedance matching.
The TW82 is built to withstand harsh weather conditions and impact, with sealed and thick-wall injection-molded construction. It provides three tracing methods: conductive, inductive, and via coupling clamp, enabling versatile utility tracing. The conductive method uses the included transmitter to make a direct electrical connection to the buried utility via conductive tracing cables. The inductive method is used when a direct connection is not possible, energizing the utility indirectly through magnetic coupling. The coupling clamp method is used when the utility is exposed, but a direct connection is unavailable. The accessory coupling clamp clamps around the utility and couples an energizing current from the transmitter.
The strength of the signal received is dependent on the depth of the utility. The audio signal decreases in volume as the receiver moves further from the utility and increases as it gets closer. When directly over the utility, the audio signal is silent. The display includes rotational arrows indicating the utility's path relative to the user's position.
Key Features
- Displays Depth, Azimuth, Signal Current, Left/Right/Over-Target
- Provides full-time continuous readouts
- Weatherproof, impact resistant and IP65 compliant housing
- Operating Temperature Range: -4°F to 140°F (-20°C to 60°C)
- Output Power (nominal): Normal Setting= 0.25 watt; High Setting= 1.0 watt
- Two-button receiver operation
- Ergonomic, lightweight design
- Programmable lateral mode
- Transmitter Output Frequency: 82.175 kHz
- Passive Power: 50Hz & 60Hz detecting
- Receiver Frequency: 82.175 kHz
- Left/Right Guidance: Audible and Visual
- Azimuth Indicator: Visual
- Conductive Tracing Impedance Matching Range:
- Normal Power. 2 to 8,000 ohms -6dB
- High Power: 2 to 3,000 ohms -6dB
- Inductive Tracing Magnetic Strength:
- Normal Power: 15 Vm2
- High Power: 25 Vm2
- Transmitter Battery Type: Four D-cell batteries (included)
- Transmitter Battery Life: Typically 130 hours
- Signal Strength Indicator: Numeric display & audible
- Signal Current Measurement: Numeric display, automatic
- Depth Measurement: Numeric display, automatic
- Receiver Battery Type: Two D-cell batteries (included)
- Receiver Battery Life: Average 80 to 130 hours
Includes:
- 6 - D-Cell Batteries
- 1 - Transmitter Unit
- 1 - Receiver Unit
- 1 - Ground-Rod Assembly
- 1 - Soft Carrying Case
- 1 - User Manual
