Liquid Controls A8981, A8981A User Manual
Optical Air Eliminator (US Patent #7000628)
Rened Fuels Applications (A8981 & A8981A)
Installation
and Parts
Liquid ControLs Group
An IDEX Fluid & Metering Business
Installation: M300-20
Table of Contents
Introduction
Specications ................................................. 3
General Information ....................................... 3
How Optical Air Eliminators Work .................. 4
Installation
New Installations ............................................ 6
Retrot Installations ....................................... 6
Dimensional Drawing ..................................... 8
Wiring ............................................................. 9
Maintenance
Disassembly ..................................................11
Reassembly ................................................. 13
Troubleshooting ........................................... 14
Bill of Materials
Exploded View ............................................. 15
Bill of Materials ............................................. 15
! WARNING
• Before using this product, read and understand the instructions.
• Save these instructions for future reference.
• All work must be performed by qualied personnel trained in the proper application, installation, and maintenance
of equipment and/or systems in accordance with all applicable codes and ordinances.
• Failure to follow the instructions set forth in this publication could result in property damage, personal injury, or death
from re and/or explosion, or other hazards that may be associated with this type of equipment.
Publication Updates and Translations
The most current English versions of all Liquid Controls publications are available on our web site, www.lcmeter.com. It
is the responsibility of the local distributor to provide the most current version of LC manuals, instructions, and specication sheets in the required language of the country, or the language of the end user to which the products are shipping . If
there are questions about the language of any LC manuals, instructions, or specication sheets, please contact your local
distributor.
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Optical Air Eliminators (A8981 & A8981A)
Specications
Environmental Rating
NEMA 4X
Safety
Designed to meet Class I, Division 2 requirements
Materials of Construction
Class1
Body: Aluminum
Solenoid: Brass
Class2
Body: Anodized Aluminum
Solenoid: Stainless Steel
Pressure Rating
Maximum non-shock working pressure
• 150PSI (10.3BAR)
Maximum differential pressure
• 100PSI (6.9BAR)
Temperature Rating
-40° to 160°F (-40° to 71°C)
Products
Class1 Rened Fuels
Gasoline, Gasohol, Diesel fuel, and Fuel Oil
Class2Aviation
Av-Gas and Jet Fuel
Solenoid (S3)
Voltage: +12 (± 2)VDC
Optional: +24 (± 4)VDC
Current: 1A maximum
Optical Sensor
Voltage: +10 to +28VDC
Current: 0.5A maximum
General Information
The Liquid Controls Optical Air Eliminator is designed for
use with LectroCount® Electronic Registers. An optical
sensor, installed in the wall of the air eliminator housing,
is used to monitor the liquid level. The presence or absence of liquid at the sensor level activates or deactivates
a solenoid valve located at the top of the air eliminator to
vent air or vapor from the system.
The optical air eliminator is designed to work with Liquid
Controls M5, M7, M10, M15, and M25 meters, for applications measuring rened petroleum products. Designed
with the same mounting dimensions as Liquid Controls
mechanical air eliminators, the optical air eliminator does
not require plumbing changes to retrot to existing meter
installations; however, electronic registers do require CPU
board part number 81920 for LCR and LCR-II; CPU board
part number 81924 for LC³. The optical air eliminator also
requires the use of a solenoid-operated control valve such
as the E-7 or A2848-11 on the outlet side of the meter.
Class 2
The Liquid Controls Optical Air Eliminator can be manufactured for Class 2 aviation applications. The Class 2 optical
air eliminator (Part #A8981A) is made with an anodized
aluminum housing and a stainless steel solenoid valve.
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Introduction
Solenoid Valve - OPEN
Vent
Optical Sensor
Control Valve - OPEN
Liquid Level
Solenoid Valve - OPEN
Vent
Optical Sensor
Control Valve - CLOSED
Liquid Level
How the Optical Air Eliminator Works
A solenoid valve, located at the top of the air eliminator,
is either open or closed. When the liquid level is below
the optical sensor (Figure 1), and a delivery is initiated,
the solenoid valve opens and vents air and vapor to
atmospheric pressure. At the same time, a solenoid-actuated control valve (A2982-11 or A2848-11) closes at the
meter outlet.
When liquid rises to the optical sensor level as the air is
exhausted (Figure 2), the optical air eliminator solenoid
valve closes and prevents continued venting to atmospheric pressure. At the same instant, the control valve
at the meter outlet opens so that a delivery may begin or
continue. This functionality ensures that only liquid passes
through the meter for measurement.
As long as a delivery is active and the liquid level remains
at or above the optical sensor, the optical air eliminator
solenoid valve remains closed and the control valve remains open. If the liquid level should drop below the optical
sensor, the optical air eliminator solenoid valve opens and
the control valve closes. When the delivery is complete,
the control valve closes and the printer prints a delivery
ticket. The optical air eliminator solenoid valve is not active between deliveries and remains OFF or closed.
Figure 1: Liquid Level below Optical Sensor
Figure 2: Liquid Level at or above Optical Sensor
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Introduction
How the Optical Air Eliminator Works
The gures to the left show a cutaway view of the vent port
through the solenoid valve. This port has been designed
to optimize the venting of air and vapor from the optical
air eliminator.
When the liquid level is below the sensor, the S3 solenoid
valve is open and allows air and vapor to vent through the
solenoid valve as shown in Figure 4. When the liquid level
is at or above the optical sensor, the S3 solenoid valve
closes the vent path as shown in Figure 5.
Figure 4: Solenoid and Port Open
Figure 5: Solenoid and Port Closed
The diagram in Figure 6 shows the LectroCount register
logic for a preset delivery. In order to function properly, the
optical air eliminator must be used in conjunction with a
solenoid-actuated control valve at the meter outlet, such
as the A2982-11 or A2848-11.
Figure 6: Optical Air Eliminator operating sequence.
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