Groz FM-10 User manual

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INSTRUCTION MANUAL S1740, Rev A
Mechanical Fuel Meter
FM-10
Congratulations on purchase of this World Class Mechanical Fuel Meter!
• High Accuracy Mechanical Flow meter, designed to
allow precise measurement of fluids compatible with the
component materials
• Designed for both in-line applications & gravity flow (with a
minimum gravity head of 4’)
• Ideal for use with Electric Fuel Pumps
• Works with both fuels and oils
• Robust Aluminum Die Cast construction
• Available in Litre / Gallon version
Meter Type Mechanical
Mechanism Nutating Disk
Inlet / Outlet Position In-Line
Inlet / Outlet 1" (F) or 3/4" (F)
Threads BSP or NPT
Flow Rate 20 to 120 LPM (5 to 32 GPM)
Accuracy +/- 1%
Repeatability +/- 0.30%
Max. Working Pressure 145 PSI (10 BAR)
Burst Pressure 435 PSI (30 BAR)
Pressure Loss at 60 LPM (16 GPM) with Diesel 3 PSI (0.20 BAR)
REFERENCE NUMBER DESCRIPTION QUANTITY
1 Meter Label 1
2 Reset Knob 1
3 Meter 1
SPECIFICATIONS
PARTS DESCRIPTION
Meter Label
Reset
Knob
Meter

2
1
6
2
7
77
7
7
7
7
7
3
8
9
5
5
5
5
5
10
11
16
12
17
13
14
15
4
EXPLODED VIEWS
Working Temperature range -10°C to 60°C (14°F to 140°F)
Max. Resettable Batch Total 999 Litres or 99.9 Gallons
Max. Non Resettable Totalizer 999999 Litres or 99999.9 Gallons
Least Count / Resolution 0.10 Litres or Gallons
Filter/ Screen Included No
Max. Viscosity of Media 2000 cSt
Option to Recalibrate by User Yes
Nr. Of positions in which display can be rotated 4
Protective Shroud on Meter No
Weights & Measures Approved No
Calibration Certificate Included No
Water Resistance Protection by meter label
For use with Electric Fuel Pumps Yes
For use with Gravity Flow Yes (minimum 4' head required)

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1. Remove the four retain-
ing screws (5) & lift up
the meter cover (3).
2. Loosen the 2 screws on
both sides and separate
the meter unit (6) from
the Register Base (8).
3. Loosen the eight
screws (7) in a
diagonal sequence as
shown in the picture.
4. Remove the Register
Base (8) together
with the gear unit (9).
During this operation,
take care not to dam-
age the Seal (14).
1
2
3
4
5
7
8
6
Register
Base Seal
Lower
Body
Meter Cover
Screw
REFERENCE NUMBER DESCRIPTION QUANTITY
1 Meter Label 1
2 Reset Knob 1
3 Meter Cover 1
4 Knob Plug 1
5 Screw 6
6 Meter Unit 1
7 Screw 8
8 Register Base 1
9 Gear Unit 1
10 Upper Half Chamber 1
11 Nutating Disk 1
12 Lower Half Chamber 1
13 Measuring Chamber 1
14 Seal 1
15 Lower Body 1
16 Calibration Screw + O-Ring 1
17 Plug + Seal 1
COMPONENT LIST
If solid particles enter the measuring chamber the correct working of the nutating disk may be affected. Always filter the fluid by
installing a filter on the meter inlet.
INSTALLATION & USE
The meter can be installed in any position, on rigid pipelines
or flexible hoses, directly on pumps or tanks. The meter flow
direction is fixed and indicated by an arrow on the outlet.
Meter Cover (3) can be removed and the Register base (8) along
with Meter Unit (6) can be rotated at every 90° orientation in four
different positions.
NOTE
The meter body is
equipped with 4 blind
holes (see diagram)
which can be threaded
(M5) for a possible
fastening.
Blind
Hole
How to rotate the Display
Meter
Unit

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Note
Always fix the plug with seal (17) to avoid leakage because
the O Ring on the calibration screw (16) does not have
any sealing function (The O Ring in this case only avoids
accidental loosening of calibration screw).
OPERATION
After installation, turn the reset knob (2) until the batch total is
completely reset. The totalizer cannot be reset in any way.
USE BY GRAVITY
This meter can also be used without pump pressure in a system
where flow is generated due to difference in height between fuel
level and dispensing point.
INSTRUCTION
Longer pipes or nozzles reduce the flow by causing higher pres-
sure losses.
Use By Gravity is not recommended where the height of fuel is
lower than 4 feet as the flow rate will be reduced, resulting in
inaccurate measurement.
On field calibration is always advisable in case of Gravity
installations.
The meter is pre-calibrated in factory under standard conditions.
A new calibration is necessary whenever
• The meter is disassembled for maintenance
• The media used is different from Diesel oil.
CALIBRATION
Calibration procedure
1. Remove the plug and seal (17).
2. Vent the air from pump, pipelines and meter by dispensing
until the flow stream is full and steady.
3. Stop the flow by shutting off the nozzle, but let the pump run.
4. Reset the Batch Total using reset knob (2).
5. Dispense at the desired flow rate into a graduated container
whose capacity should not be lower than 20 litres (5 gallons).
6. The Meter Value should be matched with the Container Value
as given below.
• If the Meter Value is higher than Container Value,
loosen the Calibration screw (16).
• If the Meter Value is lower than the Container Value,
tighten the Calibration screw (16).
7. Repeat steps (4 - 6) until accuracy is satisfactory.
8. Tighten the plug with seal (17) again.
Instruction
Do not reduce the flow in order to reach a preset value
of the calibration container. The right method is to start
and stop the full flow repeatedly until the required level is
obtained.
5. Rotate the register base (8) in the desired position. Tighten
the base with screws (7) and refit the Meter Unit (6) in the
new position. Make sure that the Total gears are moving
smoothly.
RECOMMENDED USE
Diesel, Biodiesel, Low to medium viscosity oils
DO NOT USE WITH
Water based media, Gasoline etc.
WETTED COMPONENTS
Aluminium, Butyl Terephthalate, Nitrile Rubber
Generally this flow meter does not require any special
maintenance other than the cleaning of measuring chamber
(It may get clogged sometimes due to insufficient filtration).
Note
• The meter can be easily disassembled into its main
parts without removing the body from the pipes.
• Never remove meter label from the meter.
• Cleaning is done with a soft brush or small tool
(i.e. a screwdriver).
• During cleaning, be careful not to damage the
measuring chamber or nutating disk.
• A new calibration is always necessary after
disassembling the measuring chamber.
MAINTENANCE
Before disassembling always make sure that the line pressure
is released and all fluid is drained from the meter.
Reset
Knob
Meter
Label
6. Refit the meter cover
(3) and fix the meter
label (1). Fix reset
knob by pushing it
firmly on to the reset
shaft.
7. The display can be chosen from one among the following
positions.

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2. Remove the whole
measuring chamber
(13) by lifting it from
the Lower body (15)
and at the same time
pulling it back towards
the inlet in order to
remove the O ring
from its seat.
3. To check the inside of
the measuring
chamber (13), remove
the O ring.
4. Divide the two half
chambers (10 and
12) containing the
nutating disk (11).
O Ring
CLEANING OF THE MEASURING CHAMBER
O Ring
Gear Unit
5. Use a soft brush or a
small tool (i.e a
screwdriver) to clean
the measuring
chamber. Be careful
not to damage the
chamber or the disk.
6. To reassemble, reverse the above described procedure
paying particular attention to:
• Lubricate the
Seal (14)
and O ring
before installation
• Check that the
gear unit (9) can
rotate freely
before fixing the
cover.
PROBLEM POSSIBLE CAUSE CORRECTIVE SOLUTION
Insufficient accuracy
Wrong calibration Recalibrate as mentioned in section “CALIBRATION”
Soiled or blocked measuring chamber Clean the measuring chamber as mentioned in section
“CLEANING THE MEASURING CHAMBER”
Air in the fluid Locate and eliminate leaks in inlet lines
Reduced flowrate
Clogged measuring chamber Clean the measuring chamber as mentioned in section
“CLEANING THE MEASURING CHAMBER”
Blocked or soiled filter Clean the filter
TROUBLESHOOTING
1. Remove the knob (2)
by pulling it axially
outwards. Remove
Meter cover, Meter
unit and Register base
by following steps
1 - 4 from the section:
“How to rotate
the display”.
• Recalibrate the meter as mentioned in the section:
“CALIBRATION”.
O Ring
Knob

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Groz Engineering Tools (P) Ltd.
Groz Net Industries
Village Kherki Daula, National Highway-8
Gurgaon-122001, Haryana, INDIA
TEL [phone]
FAX [phone]
FAX (USA) +1.509.271.7848
FAX (UK) +44.870.121.1854
E-MAIL [email protected]
URL www.groz-tools.com
The Groz name, Groz logo and the mark are
trademarks of Groz Engineering Tools (P) Ltd. India