Groz FM-20 User manual

S1420, Rev A
July 2009
IMPORTANT! This manual contains important warnings
and other information.
READ AND KEEP FOR REFERENCE.
Installation &
Operation Manual
MFM
Inlet/Outlet: 3/4” (F)
Inlet/Outlet: 1” (F)
MECHANICAL FUEL
METER

Disclaimer
The user/purchaser is expected to read and understand the information provided in this
manual, follow any listed Safety Precautions and Instructions, and keep this manual with the
equipment for future reference.
The information in this manual has been carefully checked and is believed to be entirely
reliable and consistent with the product described. However, no responsibility is assumed for
inaccuracies, nor does Groz assume any liability Arising out of the application
and use of the equipment described.
Should the equipment be used in a manner not specified by Groz the protection
provided by the equipment may be impaired and the warranty voided.
Questions or Service Assistance
If you have questions regarding the product or this document contact:
Groz Engineering Tools Pvt Ltd
Groz Net Industries
Village Kherki Daula
National Highway-8,
Gurgaon-121001, Haryana, India
TEL + 91.124.282.7700/ 221.4050
FAX + 91.124.2827986 /221.4224
FAX (USA) + 1.509.271.7848
FAX (UK) + 44.870.121.1854
On the Web: www.groz-tools.com
or call your local Groz representative.
Product Identification Information
Record the product identification numbers from the nameplate here.
Model Number _______
Date Code ___________ (if applicable)
NON-COMMERCIAL
This equipment must never be
used to measure media for sale.

DISCLAIMER ...................... ............................................... Back of front cover
QUESTIONS or SERVICE ASSISTANCE .......................... Back of front cover
PRODUCT IDENTIFICATION INFORMATION................... Back of front cover
General information ....................... 1
Introduction ..................................................................................................1
Before Installation ........................................................................................1
Installation.................................................................................................... 2.
Daily Operations............................................................................................2
Maintenance ................................................................................................3
Calibration.....................................................................................................3
Repair ...........................................................................................................4
Troubleshooting ............................................................................................5
Specifications ................................................................................................6
Parts & services ............................................................................................6
Illustrated Part Lists .......................................................................................7
..............................................................
Table of Contents

The purpose of this manual is to assist
you in operating and maintaining your
Groz Mechanical Fuel Meter. This manual
is designed and written with you in mind.
Please take a few moments to read
through this manual before installing and
operating your fuel meter.
If you need assistance,contact the dealer
from whom you purchased your meter.
If you feel you need further assistance,
feel free to write to Groz at
[email protected]
Meters are factory calibrated in litres
GENERAL INFORMATION
This symbol is used throughout
this manual to call your attention
to safety messages.
!
Warnings alert you to
the potential for personal
injury.
Cautions call your
attention to practices or
procedures which may
cause damage to your
equipment.
Notes give you information that can improve
efficiency of operations.
It is your responsibility to insure that all
equipment operators have access to
adequate instructions concerning safe
operation and maintenance.
Read Me!
Below is a list of major warnings and
cautions that are given in this manual.
Please take a moment to review them now
for your future safety.
Groz mechanical fuel meters are designed
for the field measurement of thin viscosity
petroleum fuels only and are intended for
use with pump or gravity feed systems
in the 15 to 75 LPM flow range. Using
mechanical gears, these meters translate
flow data from a nutating disc into calibrated
units that are indicated on the face of the meter.
Upon receipt of your meter, examine it to make
sure there are no visible signs of damage. If
damage is evident, please contact your
Groz distributor.
If the meter is located in a rigid piping system
where the fluid is trapped (for example, by
gravity, valves or nozzles) thermal expansion
of the fluid can create pressure spikes that can
damage a meter. Install a thermal relief valve or
otherwise allow for thermal expansion of the
fluid.
Your meter is designed for use only with
thin viscosity petroleum fuels such as
diesel fuel, kerosene and gasoline (up
to 15% alcohol blends such as E15, 15).
Do not use this equipment for dispensing
any fluids other than those for which it
as designed.
Any components added to your meter such
as hose, nozzle or pump must be statically
-grounded and approved for use with
petroleum fuels.
Observe precautions against fire or
explosion when dispensing fuel.
Avoid prolonged skin contact with
petroleum fuels.
1.
2.
3.
4.
5.
INTRODUCTION
BEFORE INSTALLATION
1

Any components such as hose,
nozzle, or pump added to your me-
ter must be statically grounded and
approved for use with petroleum
fuels.
1. Remove protective plugs from meter
inlet and outlet ports.
2. Wrap threaded male connections
with thread tape or use a pipe sealant
compound compatible with petroleum
fuels.
3. Install the meter on the pump. The
meter’s outlet port is marked with a
flow arrow.
4. Install other system components on
the meter and tighten snugly.
Meter Accuracy
The meter has been accurately calibrated at
the factory for use with diesel fuel. Due to
differences in viscosities and flowrates,
calibration may need to be adjusted if other
fuels are to be dispensed. Refer to the
Repair Section for calibration instructions.
Figure 1
INSTALLATION
1. Before use, visually check the meter to
ensure it is securely fitted to other system
components and there is no leakage at
connections. If leakage is present, refer to
the Troubleshooting Section.
2. Follow safety precautions, wiping any spilled
fuel from the exterior of the meter and other
system components.
DAILY OPERATIONS
Dispense Fuel
This meter is designed for use only with
thin viscosity petroleum fuels such as
diesel fuel, kerosene and gasoline
(up to 15% alcohol blends such as E15,
M15). Do not use this equipment for
dispensing any fluids other than those
for which it was designed. To do so may
damage the meter and will void the
warranty.
Observe precautions against fire or
explosion when dispensing fuel. Do not
operate the meter in the presence of any
source of ignition including running or
hot engines, lighted cigarettes, or gas or
electric heaters.
Avoid prolonged skin contact with
petroleum fuels. Use protective goggles,
gloves, and aprons in case of accidental
splashing or spillage. Change saturated
clothing and wash skin contact areas
promptly with soap and water.
2
Your system must be mounted to a vented
tank. (Figure 1)

1. The large meter display represents the
Batch Total for each fuel delivery. Before
dispensing fuel, reset the Batch Total to
zero by turning the reset knob on the side
of the meter counterclockwise. (Figure 2)
Figure 2
MFM/3-4
Your mechanical fuel meter is designed for
minimum maintenance. Examine the meter
and other system components regularly for
leakage. Keep the system exterior clean to
help identify leaks
Meter is equipped with an internal strainer.
The strainer should be checked annually or
whenever low flow is noticed. The meter may
also require recalibration if actual fuel delivery
differs noticeably from meter readings. Refer to
the Repair Section for filter and strainer access
and calibration information.
Clean Strainer
1. Remove the four retaining screws on the
strainer coverplate. Remove the coverplate
and trainer. (Figure 3)
NOTE: The small display represents the
Cumulative Total of all pump deliveries
2. To enhance meter accuracy, dispense fuel
using a quick-open and quick-close method.
Avoid choking flow as the tank becomes full.
MAINTENANCE
2. Using a fine brush, clean the strainer and
reposition in the housing.
3. Wipe clean the strainer coverplate O-ring,
groove, and the housing. Coat the O-ring
with oil or light grease and install in the
coverplate groove. (Figure 4)
4. Hold the coverplate in position and replace
the four screws by alternately tightening
screws until the coverplate is firm against
the meter housing
The meter is accurately calibrated at the
factory for use with diesel fuel. Due to
differences in viscosity and flowrates,the meter
may require recalibration to measure other
fuels or to adjust for inaccuracies.
1. Purge air from the meter and fuel system by
dispensing fuel into a container until a full
flow occurs. Close the nozzle.
2. Reset the meter counter to zero by turning
the reset knob counterclockwise.
Figure 3
Figure 4
3
CALIBRATION

3. Fill a graduated calibration container to a
specified quantity. For the greatest
accuracy, be sure the container is placed on
a level surface and a consistent flowrate is
used. When topping off the calibration
container, use a quick-open and quick-close
method until the mark is reached.
4. Compare the meter display to the quantity
in the container. If the display does not
register the quantity on the container, adjust
the meter by performing the following:
a. Gain access to the recessed calibration
screw by turning the calibration screw cover
and seal counterclockwise. Remove the
cover and seal. (Figure 5)
b. If the meter registered less than the
quantity in the container, turn the calibration
screw clockwise. If the meter display read
more than the amount in the container,
turn the screw counterclockwise.
5. Empty the calibration container and repeat
steps 2 to 4 until the meter registers the
quantity in the container.
6. Install the calibration screw cover and seal.
REPAIR
Replace Counter Assembly
or Nutator Kit
1. Pull out on the reset knob to remove.
2. Remove the two screws connecting the
counter cover to the counter assembly.
Remove the counter cover.
3. Remove the four screws securing the
counter assembly and gently pull the
assembly free. (Figure 6) Replace the
counter assembly and O-ring, as required.
4. To remove the nutator disc, loosen the two
screws holding the disc in the meter housing
and lift the disc and O-ring from the main
meter housing. (Figure 7).
NOTE: It may be necessary to place a
screwdriver under the edge of the nutator
and gently pry free.
5. Replace the nutator disc, as necessary.
Make sure the nutator disc pin is secure in
the back of the counter assembly before
assembling again.
6. To assemble, reverse the above procedure.
Make sure that all O-rings are in place and
lubricated with oil or light grease.
Figure 5
Figure 6
Figure 7
4

2. Remove the calibration screw and O-ring
by turning the screw counterclockwise.
(Figure 8) While removing, count the
number of revolutions required to free the
screw.
3. Install the new calibration screw and
O-ring, using the same number of rotations
needed to remove the old screw. Ensure
the O-ring is lubricated and seated properly.
4. Adjust the meter calibration, using
Calibration procedures provided.
Remove Meter
Your meter is designed to allow normal
maintenance and service without removing
the meter from the fuel transfer system. If
removal is necessary, use the following
procedure:
1. Drain all fuel from the system.
2. Wearing protective clothing, loosen the
meter connections from other system
components by hand. Do not use a wrench
since it could damage the meter housing
.
3. Using safety precautions, thoroughly drain
excess fuel from the meter.
4. If the meter will not be immediately installed
again, insert plastic plugs in the inlet and
outlet ports.
TROUBLESHOOTING
SYMPTOM POSSIBLE CAUSE CORRECTIVE ACTION
A. Meter Counter
Doesn’t Operate
(Normal fuel delivery)
1. Broken counter assembly
2. Foreign material in
counter assembly
3. Misaligned nutator disc
pin
4. Broken nutator disc pin or
defective nutator assembly
5. Missing or jammed counter
bevel gear
Replace counter assembly.
Remove and clean counter
assembly.
Disassemble meter and align nutator
disc pin with the counter assembly.
Disassemble meter and install new
nutator assembly.
Contact Groz Customer Service.
Replace Calibration Screw
and/ or O-Ring
1. Remove the calibration screw cover
and seal by turning counterclockwise.
5
Figure 8

SYMPTOM POSSIBLE CAUSE CORRECTIVE ACTION
C. Fuel Leakage 1. Leakage at counter
2. Leakage between counter
cover and housing
3. Misaligned nutator disc
pin
4. Leakage at fittings
Contact Groz Customer Service
Remove counter cover and inspect
for damaged, missing or incorrectly
seated seal. Replace as required.
Disassemble fittings and reseal
using thread tape or a pipe thread
sealing compound approved for use
with flammable liquids
SPECIFICATIONS
Unit of Measure
Flow Range
Type
Housing
Max. Working
Pressure
Inlet/Outlet
Filter or Strainer
Max. Batch Total
Max. Cumulative
Total
Shipping Weight
Dimensions
Width
Height
Depth
Litre
15 to 75 LPM
Nutating Disc
Aluminum
3.4 bar/50 PSI
3/4 or 1 in.
Strainer
9,999
999,999
1.8 kg
13.9 cm
11.4 cm
13.9 cm
PARTS AND SERVICE
For warranty consideration, parts, or other
service information, contact your local
distributor. If you need further assistance,
please contact the Groz Customer Service
Department.
To obtain prompt, efficient service, always be
prepared with the following information:
1. The model number of your meter.
2. Date of manufacture.
3. Specific information about part numbers and
descriptions obtained from the appropriate
Illustrated Parts List.
For warranty work always be prepared with
your original sales slip or other evidence of
purchase date.
Please contact Groz before returning any parts.
It may be possible to diagnose the trouble and
identify needed parts in a telephone call or
letter. Groz can also inform you of any special
handling requirements you will need to follow
covering the transportation and handling of
equipment which has been used to transfer
fuel.
B. Meter Counter
Doesn’t Operate
(Little or no fuel flow)
1. Clogged fuel filter or
strainer
Replace filter or clean stainer
6

7
Before packing for shipment, make sure
the meter is thoroughly drained and free
of fuel and vapors. Drain the meter using
procedures in the Repair Section. Do not return meters or parts without
specific authority from the Groz
Customer Service Department. Due to
strict regulations governing shipment of
flammable liquids, meters may be refused
and returned to the sender if sent without
authorization.
ILLUSTRATED PARTS LIST

111099-9
111006-2
111028-1
111107-1
111024-1
111047-5
110026-1
111509-1
111021-3
111021-4
111021-5
111021-7
111026-1
111014-3
904006-16
111039-2
901001-77
111032-2
111029-1
Decal, Litre..............................................................1
Counter Cover, Litre........................................... 1
Reset Knob.............................................................1
Knob Seal............................................................... 1
Cover O-Ring.......................................................... 1
Counter Assembly, Litre.......................................... 1
Housing O-Ring...................................................... 1
Nutator Kit................................................................1
Housing, 1-inch NPT............................................... 1
Housing, 1-inch BSPP............................................. 1
Housing, 3/4-inch NPT..............................................1
Housing, 3/4-inch BSPP...........................................1
Calibration Screw Seal.............................................1
Calibration Screw.....................................................1
Flat Washer..............................................................1
Calibration Cover Screw...........................................1
Seal, Filter Can & Strainer Coverplate.................... 1
Strainer.................................................................... 1
Strainer Coverplate................................. 1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Item No. Part No. Description No. Req’d
8