HF scientific Oil Content Bilge Alarm - Manual (Page 8)

Bilge Alarm (02/02)
Rev. 1.3
IX. ISOLATION VALVES
Isolation valves should be operated to shut-off flow from
the Oily-Water Filter under each of the following
conditions:
- Conducting service on the Sensing Module.
- Calibration
- Replacement of Sensing Module
Otherwise always ensure that the valves are positioned to
provide flow to the Sensing Module.
X. SETTING ALARM LEVEL
Activate “Alarm Set” switch on the Amplifier P.C. Board
in the Indicating/Control Module (Item E, Figure 5).
While holding the “Alarm Set” switch “On” (spring
return) the Digital Display will read the Alarm Set Value.
Adjust the “Alarm” Trim Pot (Item G, Figure 5) while
holding the Switch “On”, to cause the Digital Display to
read desired Alarm Level. Release the “Alarm Set” Switch.
The Alarm Relay will activate 15 seconds after the PPM
Oil-in-Water content has constantly exceeded the Alarm
Set value.
XI. INDICATING LAMPS
Green light is ON, Red light is OFF, whenever Unit is
operating under Normal Conditions.
Red Light is ON and Green Light is OFF, during Alarm
Conditions.
The reading must remain over the alarm set value for 15
seconds to activate the alarm relay.
XII. CLEANING THE SENSING MODULE WINDOWS
The Sensing Module through which the fluid flows and in
which a light beam is projected to measure oil content in
the effluent contains three precision glass windows.
One indication that these windows may require cleaning
is when the system enters the recirculation mode and
remains in this mode even though a sample of the effluent
from the Oily-Water Filter appears clean.
Cleaning may also be required when oil-free water requires
considerable adjustment on the Zero Pot (Item B, Figure
6) even though the water appears clean, or when the
display shows a PPM count less that the true value.
A periodic cleaning routine should be established to
preclude the system from remaining in the recirculation
mode because of a fouled flow channel. The frequency of
the cleaning operation should be determined on the basis
of the type of fluids being processed and how often the
flow channel becomes contaminated during initial system
use. Procedure for cleaning is as follows:
1. Turn off the flow to the Sensing Module.
2. Remove the clean-out plugs shown in Figure 2.
3. Use a mild detergent on a laboratory cleaning brush
and pass the brush through the Sensing Module
flow channel several times. Then rinse with clean
water.
4. Replace the clean-out plugs.
5. Resume normal flow.
XIII. REPLACING SOURCE LAMP ASSEMBLY
The Source Lamp in the Sensing Module may burn out
occasionally and require replacement. This failure will
cause the Bilge Alarm to go into an Alarm Condition
(Refer to Figure 7).
1. Turn OFF the Power Switch at the Indicating/
Control Module.
2. Remove the four screws in Sensing Module End
Cap and remove the Sensing Module End Cap.
3. Unscrew all lug connections except at positions #1
and #2. Save all the screws as they will be needed
later.
4. Cut the shield wire for Failsafe Light Detector at
position #2.
5. Remove screws #8 & #9 and remove the Source
Lamp Assembly.
6. Replace source lamp assembly with new unit.
Check that orientation is correct, then reinstall
screws #8 & #9.
7. Replace all lug connections at the correct positions.
8. Solder shield wire for Failsafe Light Detector to
solder lug at position #2.
9. Replace Sensing Module End Cap and fasten four
screws.
10. Turn Power Switch ON at Indicating/Control
Module.
11. This completes the Source Lamp Assembly
replacement. Proceed to Section VII (Calibration)
and perform calibration as described.
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