Groz OM 20 User manual

1
INSTRUCTION MANUAL S1710 , Rev A
Electronic Oil Meter
OM 20
Congratulations on purchase of this World Class Electronic Oil Meter!
• Electronic digital meter featuring an
oval-gear measurement system.
• Designed for easy and precise
measuring of oils and other liquids
compatible with the component
materials.
• Features a non-volatile memory for
storing the dispensing data, even
in the event of a complete power
break for long periods.
• Robust Aluminum Die Cast
construction with a protective
Rubber Shroud
Meter Type Digital
Mechanism Oval Gear
Inlet / Outlet Position In-Line
Inlet / Outlet 1/2" BSP (F) or 1/2" NPT (F)
Flow Rate 1 to 30 LPM (0.3 to 8 GPM)
Accuracy +/- 0.50%
Repeatability +/- 0.30%
Max. Working Pressure 1000 PSI (70 BAR)
Burst Pressure 2000 PSI (140 BAR)
Pressure Loss 10 PSI (0.7 BAR)
Working Temperature range -10°C to 60°C (14°F to 140°F)
Max. Resettable Batch Total 99,999 units
Max. Non Resettable Totalizer 9,99,999 units
Least Count / Resolution 0.001 units
Filter/ Screen Included No
Max. Viscosity of Media 5000 cSt
Option to Recalibrate by User Yes
SPECIFICATIONS

2
Number Of positions in which display can be rotated 0
Protective Shroud on Meter Yes
Weights & Measures Approved No
Calibration Certificate Included No
Water Resistance IP55
LCD Display
Reset Button
Measurement Chamber
Battery Housing
Calibration Button
A. MAJOR COMPONENTS
LCD DISPLAY - Includes three numerical Totals and other keys as
given below:
1. Resettable Batch Total (5 figures with moving comma)-
indicates volume dispensed after RESET button was last
pressed.
2. Indication of battery charge.
3. Indication of calibration mode.
4. Batch Totalizer (6 figures with moving comma in multiple
of 10 or 100) -indicates two types of Total:
• Non-Resettable General Total (TOTAL)
• Resettable total (Reset TOTAL)
5. Indication of total multiplication factor ( x10 or x100 ).
6. Indication of type of total, (TOTAL / Reset TOTAL).
7. Indication of unit of measurement of Totalizer:
L=Litres
Gal=Gallons
8. Indication of unit of measurement of Resettable Batch Total:
Qts=Quarts
Pts=Pints
L=Litres
Gal=Gallons
1
2
3
45
6
7
8
KNOW ABOUT YOUR FLOWMETER
Table of Contents
A. Major Components
B. Measurement Units Configuration
C. Normal Dispensing Mode
D. Resetting The Batch Total
E. Resetting The Reset Total
F. Calibration
G. Calibration Procedures –
• In-Field Calibration Sequence,
• Direct Calibration Sequence
User Buttons - The meter features two buttons (RESET and
CAL) which individually perform two main functions and together,
other secondary functions.
• RESET key - is used to reset the Batch Total and Reset Total
• CAL key - is used to enter calibration mode
• Combination of RESET + CAL keys - is used to change the
unit of measurement
Measurement Chamber -It has a threaded inlet and outlet. It
contains two oval gears which turn when media passes through
them with sufficient pressure. This action generates electrical
pulses which are processed by a microprocessor and the result is
displayed on the registers of the LCD.
Battery Housing - The meter is powered by two standard type
1.5 V batteries (size 1N). The battery housing is closed by a
threaded watertight cap that can be easily removed for quick
battery change.
WHAT IS STANDBY ?
When the media is not flowing through the meter, the display
shows only the word TOTAL on the batch register. This mode is
called STAND BY and majority of adjusments are carried out in
this mode.
12,345
1345,6
TOTAL
Standby
Mode

3
A few seconds after dispensing has ended, on the lower register,
the display switches from Reset Total to General Total: the word
RESET above the word TOTAL disappears, and the Reset Total is
replaced by the General Total.
This situation , where only “TOTAL” is displayed, is called
STANDBY mode. It remains stable until the user operates the
meter again.
B. MEASUREMENT UNITS CONFIGURATION
The METER comes with a menu through which the user can select
the main measurement unit, Quarts (Qts), Pints (Pts), Litres (Lit),
Gallons (Gal); The combination of the unit of measurement is
predefined according to the following table:
Reference No Unit of Measurement
Batch Total
Unit of Measurement
Total Register
1 Litres (L) Litres (L)
2 Gallon (Gal) Gallon (Gal)
3 Quarts (Qts) Gallon (Gal)
4 Pints (Pts) Gallon (Gal)
1. Wait for the METER to go to
Standby
2. Press the CAL and RESET keys
together. Keep these pressed until
the word “UNIT” appears on the
screen together with the unit of
measurement set at that time ( in
this example Quarts / Gallon )
3. Press RESET key to scroll among the four combinations of
units of measurement as shown :
12,345
123456
Unit QTS
GAL
QTS
GAL
SEQUENCE OF SETTING THE UNIT OF MEASUREMENT
L
L
R RR
TOTAL
C. NORMAL DISPENSING MODE
While the media is flowing through the meter, Batch Total and
Reset Total are displayed at the same time.
4. By pressing the CAL key at
length, the new settings will be
stored, the METER will pass
through the start cycle and
will then be ready to dispense in
the set units.
No new calibration is required
after changing the Unit of
Measurement.
L
L
12,345
2342,3
TOTAL
12.3 Reset
TOTAL
12,345
12.3 TOTAL
12,345
1. While in standby (i.e when the display shows TOTAL), press
the RESET button.
2. During reset, the display screen first of all shows all the lit-up
digits and then all the switched off digits.
3. At the end of the process, a display page is first of all shown
with the reset batch and the Reset TOTAL.
4. After a few moments, the Reset TOTAL is replaced by TOTAL.
E. RESETTING THE RESET TOTAL
The Reset Total can be reset by pressing the RESET key at length
while the display screen shows Reset TOTAL. The steps to be
taken are:
1. Wait untill the display shows Total only (standby mode)
2. Press the RESET key quickly.
3. The meter starts to reset the Batch Total.
4. While the display page showing the Reset Total is displayed,
press the Reset key again for at least 1 second.
5. The display screen again shows all the segments of the
display followed by all the switched-off segments and finally
shows the display page where the new Reset Total is shown.
D. RESETTING THE BATCH TOTAL
F. CALIBRATION
In standby mode, press the CAL key at length to see the current
calibration factor.
• Factory K Factor: Factory-set default factor.
It is equal to 1 (indicated as 1,000).
• User K Factor: Customized calibration factor,
meaning modified by calibration.
The meter has been calibrated at the factory under the following
operating conditions:
Fluid motor oil type : 10W40
Temperature : 20°C (68°F)
Flow rate : 5-25 litres/min
Calibration is needed to make the meter suitable for actual
conditions.

4
IMPORTANT
The METER features a non-volatile memory that keeps the
data concerning calibration and total dispensed quantity
stored for an indefinite time, even in the case of a long power
break.
G. CALIBRATION PROCEDURES
1. In-Field Calibration, performed by means of a dispensing
operation
2. Direct Calibration, performed by directly calculating the
calibration factor.
By pressing CAL key while the meter is in Standby, the
display page appears showing the current calibration factor
used.
Two cases can occur:
CASE 1
If no calibration has ever been performed, or the factory
setting has been restored after previous calibrations, the
following display page will appear:
The word “Fact” abbreviation for “factory” shows that the
factory calibration factor is being used.
CASE 2
If, on the other hand, calibrations have been made by the
user, the display page will appear showing the currently used
calibration factor (in our example 0,998).
1,000
Cal FACT
0,998
Cal USER
The word “user” indicates that a calibration factor, set by the
user is being used.
To confirm the choice of calibration factor, quickly press CAL
while “User” or “Fact” are displayed.
After the restart cycle, the meter uses the calibration factor that
has just been confirmed.
IN-FIELD CALIBRATION SEQUENCE
1. Wait until the METER comes in
Standby (Display shows TOTAL).
2. Press CAL key for more than 2
seconds. The METER enters
calibration mode and shows
“CAL”. The words “FACT” and
“USER” indicate which factor
(factory or user) is currently
in use.
12,345
12,5
OR
1,000
Cal
FACT
0,998
Cal
USER
TOTAL
3. Press RESET key for more than 2
seconds. The METER shows
“CAL” and the Batch Total at zero.
The meter is ready to perform
in-field calibration.
4. DISPENSING INTO SAMPLE
CONTAINER
Without pressing any key,
start dispensing into the
sample container.
While dispensing, do not try to
reach a particular reading of
the container. Instead make
short top-ups in the final stage
of dispensing.
0,000
Cal FIELD
9,800
Cal FIELD
9.86
Container Value
Meter Value
5. Press RESET key once.
The METER detects that
the calibration dispensing
is finished. To calibrate the
METER, the value indicated
by the Batch total (example
9.800) must be forced to the
Container value marked on the
graduated sample container.
An arrow (up/down) appears
which indicates the direction
in which the value can be
changed via steps 6 & 7.
9,800
Cal FIELD
6. Press RESET key once. The
arrow changes direction. The
operation can be repeated
to alternate the direction of the
arrow.
9,800
Cal FIELD

5
If normal METER operation shows a mean percentage error
E, (obtainable on the basis of several performed dispensing
operations), this can be corrected by applying a correction to the
current calibration factor as shown below :-
New cal. Factor = Old Cal Factor X
Example:
Error percentage found E% = - 0.3 %
CURRENT calibration factor = 1.000
New USER K FACTOR = 1.000 * [(100 – ( - 0.3))/100]
= 1.000 * [(100 + 0.3)/100]
= 1.003
7. The meter value changes in
the direction indicated by the
arrow
• One unit for every short
press of CAL key.
• Continually if the CAL
key is kept pressed.
9,860
Cal FIELD
-----
Cal END
1,015
Cal END
8. Press RESET key for more than
2 seconds .
The METER is informed
that the calibration procedure
is finished.
The meter calculates the new
USER K FACTOR factor for a
few seconds.
9. The new USER K FACTOR is
shown for a few seconds,
after which the restart cycle
is repeated.
10. The METER comes back to
standby mode.
12,345
12.5
1,000
FACT
USER
DIRECT CALIBRATION SEQUENCE
1. Wait until the METER comes in
Standby (Display shows TOTAL).
2. Press CAL key for more than 2
seconds.
The METER enters calibration
mode and shows “CAL”. The
words “Fact” and “USER”
indicate which factor (factory
or user) is currently in use.
TOTAL
Cal
0,000
Cal FIELD
1,000
Cal DIRECT
1,000
Cal DIRECT
1,003
Cal DIRECT
3. Press RESET key for more than
2 seconds.
The METER shows “CAL” and
the Batch total at zero. The
user can perform in-field
calibration now.
4. Press RESET key for more than
2 seconds.
“Direct” appears together with
the Current calibration factor.
In the bottom left part of the
display, an arrow appears
(upwards or downwards)
defining the direction (increase
or decrease) of the reading.
5. By pressing RESET key
the user can change the
direction of the arrow.
6. By pressing CAL key, the Meter
value changes in the direction
indicated by the arrow,
• one unit for every short
press of CAL key .
• continually if the CAL key
is kept pressed. The speed
increase rises by keeping
the key pressed.
7. Press RESET key for more
than 2 seconds.
The METER detects that
the desired reading has been
set and the calibration procedure
is finished.
8. At the end of the calculation, the
new USER K FACTOR is shown
for a few seconds.
9. The restart cycle is repeated to
finally achieve standby mode.
1,003
Cal END
-----
Cal DIRECT
TOTAL
12.5
0,000
12,5 TOTAL
0,000
100 - (E)
100

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MAINTENANCE
The meter has been designed to require a minimum amount of
maintenance.
The only maintenance jobs required are:
• Battery change - Necessary when the batteries have run
down
• Cleaning the measurement chamber - Due to the presence
of solid particles following bad filtering.
12,345 QTS
GAL
1. When the battery charge falls
below the first level on the
LCD, the fixed battery symbol
appears. In this condition, the
METER continues to operate
correctly, but the fixed icon
warns the user that it is time
to change the batteries.
2. If first alarm is ignored without
changing the batteries, the
second battery alarm will
prevent operation. In this
condition the battery icon
starts to flash and is the only
one to remain visible on the
LCD.
CHANGING THE BATTERY
The METER features two low-battery alarm levels
2342,3
TOTAL
BATTERY REPLACEMENT PROCEDURE :
• Press RESET to update all the totals.
• Unscrew the battery plug (8).
• Remove the old batteries.
• Place the new batteries in the same position as the old ones,
making sure the positive pole is positioned as indicated on
the cover .
• Re-tighten the battery plug, making sure the conical spring (9)
& O-ring (7) is correctly positioned.
• The METER will switch on automatically and normal operation
can be resumed. The old calibration will stay same as before..
CLEANING OF THE MEASUREMENT CHAMBER
The measurement chamber can be cleaned without removing the
meter from the lines.
• Loosen and remove the four cover retention screws (15).
• Remove the cover (14) and the seal (13).
• Remove the oval gears (11) & (12).
• Clean wherever necessary. For this operation, use a brush or
pointed object such as a small screwdriver.
• Be careful not to damage the body or the gears.
Always make sure the liquid has been drained from the meter
and the line presure is released before cleaning. To clean the
chamber, proceed as follows.
(Refer to the parts indicated in the exploded view):
EXPLODED VIEW
1
2
17
3
18
4
4
4
4
5
14
15
13
15
15
15
11
10
12
616
7
98

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REFERENCE NUMBER DESCRIPTION QUANTITY
1 Meter Label 1
2 Plastic Face 1
3 Electronic Board 1
4 Screw 4
5 Meter Housing 1
6 Battery 1.5V N size 2
7 O-Ring 1
8 Battery Plug 1
9 Conical Spring 1
10 Oval Gear Pivot 2
11 Oval Gear 1
12 Oval Gear with Magnet 1
13 Seal 1
14 Cover 1
15 Screw 4
16 Battery Protection 1
17 Spacer for Bulbs 1
18 Spacer for Key 2
COMPONENT LIST
Fit the second gear (without
magnets) with axis greater
than 90° compared to the
first gear, and with the holes
visible from the cover side.
Make sure the gears are
turning freely before closing
the cover.
Only one of the two gears
features magnets. This must
be fitted in the position
marked “MAGNET” (see
drawing). Once the gear has
been fitted, the magnets
must be visible before closing
the cover.
RECOMMENDED USE
Oils with viscosity upto 5000 cSt, Diesel, Biodiesel
DO NOT USE WITH
Water based media, Gasoline etc.
WETTED COMPONENTS
Aluminium, Stainless Steel, Nitrile Rubber & POM
CAUTION
To reassemble the meter, take care of the following step :

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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
PROBLEM CAUSE SOLUTION
LCD: Indication is dull Battery Low Replace battery (See Maintenance - Changing the battery)
Not enough measurement
precision
Wrong K FACTOR Adjust the calibration factor (See Calibration Procedures)
The meter works out of flow rate nominal range Re-enter at flow rate nominal range
Reduced or Zero flow rate Gears blocked Clean the measurment chamber (Refer Maintenance)
Indication Error 1 flashing The data in the electronic board memory have
beeen damaged Not repairable
Indication Error 2
temporary
Temporary error during data reading (possible at
battery change) The board will restart automatically to restore correct working
The meter does not count,
but the flow rate is correct
Incorrect installation of gears after cleaning Refit the gears correctly as shown in Maintenance-cleaning of the
measurment chamber
Possible electronic board problems Contact your Dealer
TROUBLESHOOTING