Humboldt H-4040 Series Water Level Indicators - Manual (Page 2)

GENERAL
The H-4040 Series Water Level Indicators are self-contained instruments for
determining water levels in wells, bore holes, etc. Each unit consists of a hand-
held wire spool with indicator module, measuring cable and probe. The spool,
constructed ABS plastic and steel is equipped with a brake and clip for probe
storage.
The indicator module has both audible and visual indicators to show when
water has been detected. A standard 9-volt battery is the only power
source required. The multi-conductor cable does not require any additional
connections or ground wires. The wire used is high-strength, hard-drawn,
copper-coated steel for stretch resistance. Markings are permanently
embossed on the wire.
The probe is constructed of stainless steel and Teflon* for environmentally
sensitive testing.
FEATURES OF MODULE
The following features are included on the front panel of the
CONTROL MODULE:
• The POWER SWITCH controls power to the instrument and is labeled OFF.
The unit in ON when the switch is in the upper-most position.
• The TEST SWITCH, labeled TEST, is used to check the battery condition.
• The RED LIGHT at the top of the panel serves two functions. First, it
indicates the condition of the battery. It also works in conjunction with the
horn, as an indicator to announce when water has been located. The light is
not labeled.
• The HORN, in the center of the panel, provides audible signal when water is
contacted. The horn is not labeled.
• The SENSITIVITY CONTROL provides a means to adjust the instrument and
compensates for varying water conditions. See Section 3.0 for details.
OPERATION
IMPORTANT! Set the SENSITIVITY CONTROL mid-range or higher (toward the
+ sign), anytime you are searching for water of an unknown conductivity. To test
battery, turn power on by sliding the left switch up toward the top of the
panel. Press right switch labeled TEST (red light will glow brightly if battery is
fully charged). See Section 7.0 for important details regarding battery condition.
To test the system, the power must be on and the SENSITIVITY CONTROL set
mid-range or higher (toward + sign). Dip the probe in water and the light and
buzzer should function. You can also wet the tip of your thumb and pointer
finger with water or saliva and simultaneously touch the two needles at the
end of the probe to get the same effect.
For normal operation, simply lower the probe down the well or bore hole.
When the probe touches water, the buzzer and light will operate. When the
probe is lifted clear of the water, the indicators will shut off. The SENSITIVITY