Figure 8. Simplex Moisture Detection Controller
INSTALLATION, OPERATION AND MAINTENANCE
INSTRUCTIONS FOR MOISTURE DETECTION
CONTROLLER
General
The Moisture Detection Controller is a conductance
actuated control for detecting moisture in the oil chamber
of a submersible pump motor. It is used as a warning
device to indicate a seal leakage and to signal the need
for preventative maintenance.
Installation
Mount control box vertically on wall or other solid
structure and accomplish all indicated wiring. Terminals
on the control are numbered and are in the same relative
position as shown on the wiring diagram. Terminal pair
1-2 must be continuously energized form an A.C. supply
line of electrical characteristics shown on the data
plate. Contacts 5-6 and/or 7-8 are available for load
duty, and if required, must be wired in Series with the
load device or devices, and that series branch circuit
connected across a power source compatible with the
load. Terminals 9-10 are connected to the moisture
sensing probes in the motor marked W1-W2 via the
cable provided with the motor.
Operation
Normally the oil surrounding the probes is nonconductive,
and the control and seal leakage indicator light will be de-
energized. An influx of moisture past the outer seal and
into the oil reservoir will change the conductivity of the
Oil and this condition will cause the relay to energize,
and the seal leakage light will energize to indicate a seal
leakage. Load contacts 5-6 and/or 7-8 will also change
from their normally open or normally closed position when
the control energizes.
Test Procedure
A normally closed pushbutton and neon indicating lamp
are provided as a part of the control for testing the
moisture sensing components. The motor manufacturer
has provided a 330,000 ohm resistor across the probes
inside the motor to complete the test. When the test
pushbutton is depressed, the neon indicating lamp will be
illuminated to indicate: (a) Power is supplied to the control.
(b) The control is operative.
(c) The wiring to the moisture
sensing probes in the motor is intact.
This check does not simulate a leakage. An ad-
ditional check can be made by removing the enclosure
cover and momentarily placing a jumper (or 20,000 ohm
resistor) across terminals 9-10 on the control. This will
energize the control, and test out the neon indicating
lamp and associated voltage dropping resistor across
terminal 2 and 4.
CAUTION: Voltage will be present at all terminals on
the control when this test is being made.
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