The Pro871C Underground Cable Locator is a value-priced underground locator for contractors and maintenance personnel. Incorporating 5 different tracking modes (2 direct connect, 2 inductive, 1 passive), the Pro871C tracks many types of cabling — including CATV, electrical, telephone, dog fencing and landscape lighting, using either null or peak reception modes.
The Pro871C offers features not previously available at this price point. The Pro871C cable locator includes high and low direct connect frequency capability, a built in inductive antenna, a passive 50/60Hz detection mode, as well as null or peak tracking options. In addition, the IC2 inductive clamp (included with the Pro871C version) allows non-metallic inductive connection to wires and cables, inducing signal onto the conductor and providing a tracing signal.
Battery Installation – The Pro871 transmitter requires 8 “D” cell batteries. The Pro871 receiver requires one 9v battery. To install the batteries in the Pro871 transmitter, open the case and remove the 2 holding screws on the battery compartment cover located on the right side of the unit and remove the cover. Place the 8 “D” cell batteries in the holders, orienting them in accordance with positive and negative poles. Turn on the Pro871 and make sure the green ‘ON’ LED comes on. If no response is seen, try adjusting the batteries to insure good connection. If still no response, be sure the batteries are good and fresh. This can be noted by the red ‘LO Batt’ LED located to the left of the ‘ON’ LED.
The Pro871 receiver battery compartment is located on the backside of the Pro871R wand unit. Open the battery compartment cover. Install the 9 volt battery and replace the cover. Turn the unit on and observe the ON LED to confirm good battery install.
The Pro871 receiver also has a LO BATT LED and it acts as a warning that the 9 volt battery is weak. When this LED comes on, monitor the performance of the receiver or just replace the battery.
Setting up the Transmitter: Direct Connection with Alligator Leads – With the transmitter off, connect the red alligator lead into the red port on the Pro871 transmitter and to the wire you want to trace. Attach the black alligator lead to the black port and the included ground stake. Insert the ground stake into the soil or earth ground. Do not use common grounds such as pipes or electrical grounds. It is important that the ground stake be in the soil and independent for the Pro871 to work properly. Jumper cable can be used if the distance to the earth ground is too far to reach.
Turn the Pro871 transmitter on. Adjust the frequency setting for either HI or LO. The LO setting requires a good ground coupling between the target cable and the earth. If it has this, LO usually provides a longer distance locate with less bleed over into other cables. Without this ground, your locate will not be effective and HI should be used. Either setting, HI or LO, can work to trace cable and it is up to the operator to select the frequency best suited to his/her particular conditions.
The red Transmit LED will blink when the unit is in HI or LO mode and a good tracking signal circuit has been formed. The brighter the LED blinks, the better the circuit conduction and therefore the better the tracking signal is working. A dim blinking LED indicates a poor circuit and consequently, then the locate will be difficult.
In Induction Mode, the Transmit LED will not come on. The Induction LED will, indicating that you are transmitting an induction frequency for use as described below.
Experiment with which setting works best for the job you are doing. NOTE – THE TRANSMITTER AND RECEIVER MUST BE BOTH ON THE SAME FREQUENCY SETTING (Hi or Lo) TO WORK PROPERLY.
Setting up the Transmitter: Inductive Antenna – The Pro871 transmitter has an antenna used for transmitting a tracing signal without connecting to the cable. This is called induction. This feature is handy when the user has no access to the physical metal of the cable or does not wish to disconnect the cable from service. To use the Pro871 inductive antenna (built into the case), the user merely needs to select “induction” on the transmitter control panel after turning it on. The Pro871 wand also needs to be put in the “induction” mode. After the wand has been put into “induction” mode, track the wire as normal, following the transmitted beeping signal. As a note, the transmitted signal will interfere with your locate up to 20 feet from the transmitter as the signal emits in all directions. Start the locate at least 20 feet from the transmitter.
Setting up the Transmitter: Inductive Clamp – For use with the inductive clamp IC2 (included with the Pro871C version), use the “Induction” setting on the transmitter and receiver.
To use the IC2 clamp, plug the clamp into the clamp receptacle on the Pro871T transmitter and turn the unit on, using the “Induction” setting on both the transmitter and receiver. Clamp the IC2 around the cable to be traced. Please note, the clamp must be placed between grounding points on each end of the cable and the cable must be grounded on both ends for the clamp to work. The clamp induces current onto the cable and the current will not flow if the cable isn’t grounded on both ends.
You can increase the effectiveness of the clamp by wrapping the wire around the clamp as many times as possible and if possible. Like a transformer, the more wraps, the more power.
Tracing Wire – After the Pro871 transmitter has been properly connected and verified to have a good ground and power, turn on the Pro871 receiver by turning the volume knob on the front of the receiver clockwise. Place the receiver near the operating Pro871 transmitter. A beeping sound should be heard indicating that the receiver is working properly. A high pitched tone could indicate that you are too close to the receiver or your batteries are low. A fading signal indicates low battery. If you suspect low battery, consult the Lo Battery LED on the receiver and transmitter.
The black control knob on the front of the receiver regulates the volume of the receiver, both headphones and external speaker. Additionally, the analog meter on the front of the receiver will indicate the reception power level visually. After connecting and turning on the transmitter and turning on the receiver, point the receiver toward the ground and listen for the beeping signal. The closer you are to the cable, the louder the signal should be except for directly over the cable in the NULL mode (discussed next).
The Pro871 also has the option of NULL or PEAK tracing. Simply put, NULL means that the signal nulls or stops when the receiver is directly over the cable. PEAK means the signal is loudest directly over the cable. The user should become familiar with this difference and select the response that best suits their preference.
Tracing Live Electrical Lines using Passive Mode – The Pro871 receiver has the capability of detecting live electrical AC lines in the ground without connecting to them. This is known as passive mode. In passive mode, no transmitter is used. DO NOT ATTEMPT TO CONNECT THE ALLIGATOR LEADS OR ANY OTHER PRO871 COMPONENT TO LIVE ELECTRICAL LINES. DEATH OR INJURY COULD OCCUR.
To use the passive mode, turn on the Pro871 wand and select the passive mode using the switch marked “60Hz”. This switches the receiver into an unfiltered mode that detects the electrical field generated by 50Hz or 60Hz electrical current. Once the Pro871R wand is on, simply search an area until you hear a buzzing sound. There is no beeping signal as the transmitter is not used. Follow the buzzing sound in either null or peak mode, both will work, to track the cable. You will not be able to use passive mode if there is no live electrical current present on the cable.