15
15
The depth measurement is a complicated procedure requiring accurate calculations. The
measurement conditions do not always permit depth defining with required accuracy. Some of
such situations are as follows:
1.
The measured signal is too low and distorted heavily by side interferences.
2.
There are other buried utilities located near measurement points which provide the
parasite signal.
3.
The monitored buried utility has a turn, branch, valve, cartridge etc. near measurement
point.
4.
The monitored buried utility goes upwards or downwards at the measurement point at a
significant angle.
5.
The measurements are carried out close to the connection point of the generator or the
cathode protection system.
6.
There are massive metal objects near the receiver antenna.
7.
There is a source of electromagnetic interference (for instance, the vehicle with running
motor) near the measurement point.
8.
The signal incoming to the receiver sensors is too strong and thereby distorted.
2.11 Battery installation and replacement
After each switching on, the receiver displays the current voltage of the batteries in volts. The
voltage below 2,6V (2,2V for accumulators) indicates that the batteries will need to be replaced
soon, so make sure the spare batteries are available. When the battery charge is expiring, the
symbol in the corner of the indicator starts blinking. That means the operation time left is from
15 minutes to 1 hour depending on the battery type. When the battery is discharged totally, the
receiver turns off all the symbols on the LED, blinks with the signal for some time and switches
off after that.
The receiver is fed from two D-size elements (element 373). It is recommended to use the alkaline
elements for power supply.
To replace the power elements (see figure 2.21) unscrew the screw of the battery compartment
cover (а), remove the cover (b), pull the battery
compartment outside using the cord (c). Replace
the power elements. Observe the polarity!
To avoid the battery discharge due to accidental activation of the receiver, the latter features
automatic switch-off capability.
Do not use together galvanic elements and accumulators, new and discharged batteries nor
batteries of different types. This may result in leakage (in some cases
–
to ignition) and damage
to the receiver. Remove the batteries if the instrument is to be stored for a long time.
