By operating the 8875 receiver at multiple frequencies, the performance can be optimized for the specific needs of the user
By operating the 8875 receiver at multiple frequencies, the performance can be optimized for the specific needs of the user. The low frequency of 815Hz provides a longer range of locating and has fewer errors from adjacent cables. The high frequency of 82kHz will path locate past bad telephone bonds, underground stubs and permit inductive locating with either the optional Flexicoupler or by using direct soil induction. The 8875 has excellent passive 60Hz locating and the receiver will pinpoint active power lines and other utilities.
Push Button Depth
The 8875 locator has the added capability of determining the depth of a conductor with the push of a button. On the LCD display, depths up to 15 feet are quickly displayed in inches or centimeters.
Absolute Signal Strength
To make identifications easier, the absolute signal strength is continuously displayed on the 8875 LCD display. Position the receiver over the target cable and simply look for the highest number displayed in peak mode or the lowest number in null mode. The absolute signal strength can also identify a loss of signal-to-ground caused by damaged cable, insulated pipe bushings or by shorted pipes.
The advantage of high power at low frequency with the 8875 solves the difficult multi-point grounded utility locating problem. Low frequency (815Hz) virtually eliminates the false coupling into adjacent objects and allows the high transmitter power to burn a signal past several grounds and into multiple distributed grounds. The high power at high frequency provides excellent inductive coupling and direct soil induction. The circuit will bridge or jump across an open or damaged cable and no direct connection is needed.
Conductor Current Readout
The 8875 locator gives the user information on the amount of current flowing on the target conductor with correction for changes in a conductor's depth. To trace the direction where the transmitter signal is divided or where it goes into the soil at an insulation ground fault, push and hold the current button. This feature is successful when used on a cathodically protected system with ground faults.
The 8875 transmitter has the option of a built-in rechargeable battery (8875-01).or the option of "D" cell alkaline batteries (8875-00).
Normal and High Power
A high power transmitter is a superb asset in field locating. The "On" (normal) power setting at 200mW on high frequency is typically adequate. This operating mode conserves battery life and limits high frequency spillover during routine locates with normal power.
Optional Fault Locating
The 8875 instantly becomes a fault locator when the receiver is attached to the optional Ground Return Probe (GRP). The GRP can be used whenever sheath damage is suspected.
Rycom Instruments, Inc., 9351 E 59th Street, Raytown, MO 64133-3895. Tel: 816-353-2100; Fax: 816-353-5050.