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Page Title: Salinity Indicator Panel - Cont'd
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(center) position and a TEST position. The rotary
switch, S1, when placed in the TEST position,
switch, s3, when placed in the TEST position,
disconnects resistor R5B in the salinity cell circuit,
connects the movable windings, A and B, of the
resulting in an unbalanced condition that causes the
power-factor-type meter in a circuit comprising
cell to behave as though a high salinity condition
resistor R10 and potentiometer R11, the resistances of
exists. This action energizes the alarm circuit, causing
which duplicate the resistances of the electrodes and
the red alarm light to flash and the alarm relay to sound
compensator. There are two circuits through the
the external alarm. The meter switch, S1, when placed
movable windings. One circuit is from line terminal
in the METER position, connects the meter unit in the
SB, the right arm of potentiometer R11, terminal 4 of
circuit of the associated salinity cell and a salinity
switch S3, resistor R10, to line terminal SBB. The
reading is indicated on the meter.
other circuit is from line terminal SB, the left arm of
potentiometer R11, terminal 6 of switch S3, resistor
UNIT.-- The valve position and meter test module
R10, to line terminal SBB. With the meter test switch
(fig. 10-42) is provided with a green valve position
in the TEST position, the meter should read 1.7 ppm.
indicator lamp and a meter test switch. The dual
RELAY UNIT.-- The relay module (fig. 10-42)
purpose of the unit is to indicate when the control
consists of an alarm relay, K2, and two 2-second delay
valve is in the NORMAL or ABNORMAL position
flashers. (For simplicity, only one flasher is shown.)
and to provide a means of testing the meter unit.
The flasher is used to delay the tripping time of the
When the solenoid trip valve is in the NORMAL
solenoid-operated valves. Normally, the current
position, as shown, the green indicator lamp is
through the delay flasher contact circuit is not
illuminated steadily; when the control valve is in the
sufficient to open the flasher contacts. However, if
ABNORMAL position, the green alarm light flashes;
terminal 5 of the relay unit is energized from an
and when the control valve is reset manually, the green
associated salinity cell, the flasher contact will open,
alarm light is again lighted steadily.
de-energizing control power relay K1-1 and causing
The meter test switch, when placed in the TEST
contacts K1-1 to open. This action de-energizes the
position, connects the meter unit in a circuit
valve control circuit, causing the valve to actuate.
simulating a known salinity condition (1.7 ppm) to
The rectifier, CR2, allows a current to flow
check the calibration of the meter.
through the operating coil of alarm relay K2, from the
The valve position portion of the unit consists of
plate of V1, through switch S2, in the NORMAL (up)
the green indicator lamp, I3, and the flasher, H1,
position, and back to the other side of line SBB.
interconnected with the solenoid-operated valve.
Rectifier CR5, across the coil of K2, maintains the
During normal operating conditions, the solenoid is
current flow through the coil during the non-
energized from the line terminal SSB through the
conducting half cycles of V1, The contacts of relay K2
contacts of the power control relay, K1-1, terminal 1
close to energize the external alarm circuit.
of the SPDT switch, S4 (on the control valve), to line
The silencing switch, S2, when placed in the
terminal SB. The green indicator lamp, I3, is
SILENT (down) position, opens the circuit to the
illuminated steadily during this condition from line
audible alarm and connects the plate of V1 to one side
terminal SB, the contact arm of flasher H1, to line
of the alarm light through CR2. As long as the salinity
terminal SBB.
is higher than the alarm setting, CR2 allows a current
When art abnormal condition occurs, the power
to flow directly through the red alarm light, 12, which
control relay, K1-1, is de-energized and its contact
is lighted steadily. During this condition, CR3
opens the circuit to the solenoid coil, which actuates
prevents a large current flow through the heater of the
switch S4. This action connects the heater and contact
flasher, H2, When the salinity decreases to a value at
arm flasher H1 from line terminal SB, through
which V1 ceases to conduct, the flasher heater voltage
terminal 2 of switch S4, to line terminal SBB, causing
causes the red indicator light to flash as a reminder for
the green indicator light to flash.
the operator to place the silencing switch, S2, in the
NORMAL (up) position.
The meter test portion of the unit consists of meter
test switch S3, resistor R10, and potentiometer R11.
Normally, the current flows through the relay
Normally, the meter unit is not connected to a salinity
module from the line terminal, SBB, the bimetallic
cell. The meter test switch, S3, is a two-position,
arm of the delay flasher, the coil of the power control
spring-loaded rotary switch having a NORMAL
relay, K1-1, to the line terminal, SB. This current

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