MMC D-2401-2 Operating instructions

MMC INTERNATIONAL CORP.
OPERATING AND MAINTENANCE
INSTRUCTIONS
INTRINSICALLY SAFE
TRIPLE FUNCTION GAUGING TAPE
FOR RESTRICTED APPLICATIONS
LIQUID MEASURE OF ULLAGE, OIL/WATER
AND TEMPERATURE
MODEL D-2401-2
TECHNICAL APPROVED BY:
FACTORY MUTUAL AND BASEEFA FOR
CLASS I, DIVISION I, GROUPS C & D
AND
LLOYD'S REGISTER AND BUREAU VERITAS "MED" APPROVED
IN ACCORDANCE WITH IMO RESOLUTION MEPC.5 (XIII)
FOR OIL/WATER DETECTION
MMC INTERNATIONAL CORP
60 INIP DRIVE
INWOOD, NEW YORK 11096
AUG 2006DRAWING FILE NO. A-2401-60

TABLE OF CONTENTS
PAGE
NUMBER
NOTICES
i
I. GENERAL
1.0 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 LINEAR ACCURACY SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2 SPECIAL FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
II. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
III. THEORY OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
IV. REQUIRED CONDITIONS AND RECOMMENDATIONS FOR SAFE USAGE
4.1 REQUIRED CONDITIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.2 RECOMMENDED SAFE USAGE CONDITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
V. OPERATION
5.1 FAMILIARIZATION WITH OPERATING CONTROLS AND FEATURES
LOCATED ON THE TAPE REEL HUB COVER PANEL . . . . . . . . . . . . . . . . . . . . 8
5.2 ULLAGE/INTERFACE MEASUREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.3 TEMPERATURE MEASUREMENT PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . 10
VI. CARE AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
VII. CALIBRATION PROCEDURE
7.1 ULLAGE AND INTERFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7.2 TEMPERATURE SENSOR CALIBRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
VIII. GAUGING TAPE REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
IX. HUB COVER AND P. C. BOARD REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
X. FAULT FINDING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
XI. APPENDIX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
XII. LIST OF DRAWINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

NOTICE TO ALL EQUIPMENT USERS
If your gauging device has been equipped with an all Stainless Steel Triple Function Sensor (Material Type 316SS).
The triple functions of this sensor are to detect cargo surface level, Ullage, the Interface between two immiscible
products such as oil and water, and cargo Temperature.
The normal order of the gauging device, response to the products "Ullage level", is a steady horn tone. The normal
response to an "Interface level", ("i.e." between a non-conducting and a electrically conducting product such as a
petroleum product and water, is a "steady" tone changing to a "beeping" tone, at the interface level.
A special note to our chemical customers, is the fact that some chemical cargoes may be inherently
conductive.
Therefore, at the surface of a conductive product's Ullage level, a "beeping" tone will be the normal response.
As a further note to the above, the change in detection of a non-conductive product Ullage level as a steady tone to
that of a conductive product's ullage "beeping" tone, it is not to conclude that the sensor is malfunctioning.
The all stainless steel Triple Function sensor is IMO Resolution MEPC.5 (XIII) approved, and therefore also meets
the International requirements of a petroleum carrier, or a dual classed chemical / petroleum carrier.
We hope that this sensor performs satisfactorily for all your applications and we would appreciate any return
comments you may have concerning its response to various products.
Best Regards,
MMC International Corp.
i

SECTION I
I. GENERAL
1.0 SPECIFICATIONS:
Display Readable Temperature Range . . . . . . . . . . . . . . . . . . . . °F = -40°to 199.9°*
*Reading Limit Due to 3-1/2 Digit LCD Display on °F Range. °C = -40°to 150.0°
Guaranteed Temperature Calibration Range . . . . . . . . . . . . . . . . 32°F to 190°F
(and 0°C to 88°C)
Accuracy Over Calibration Range . . . . . . . . . . . . . . . . . . . . . . . . ±0.5°F (±0.2°C)
Accuracy Linear Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . ±1/8” (±3.0MM), Plus ±0.01%
of Total Tape Length, worst case
Minimum Detectable Tank Bottom Liquid Level . . . . . . . . . . . . . 3/8” (10MM)
Minimum Detectable Floating Product Level . . . . . . . . . . . . . . . . 1/8” (3MM)
Batteries for Intrinsically Safe Operation Only (supplied) . . . . . . . 9 Volt Eveready #522 or
Duracell MN1604
Battery Drain (Temperature Mode) . . . . . . . . . . . . . . . . . . . . . . . . 1.3 ma (In Air)
2.6 ma (In Fluid)
Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1/2 Digit Liquid Crystal
Display 1/2” Character Height
Operating Temperature Limit of Liquid Crystal Display, -40°F to 176°F
Ambient Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to 80°C
Storage Temperature Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -67°F to 185°F
-55°C to 85°C
Available Tape Length - Single Face Scale . . . . . . . . . . . . . . . . . . . 50 FT or 15 Meters
75 FT or 25 Meters
100 FT or 30 Meters
100 FT (10ths & 100ths)
120 FT (37 Meters)
Hazardous Environments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Certified Intrinsically Safe
BASEEFA and Factory Mutual
Gas Groups C&D
Page 1

1.1 LINEAR ACCURACY SPECIFICATION:
MMC PORTABLE ELECTRONIC GAUGING TAPE
STANDARD PRODUCTION
LINEAR MEASUREMENT ACCURACY
Applicable Equipment: MMC Models D-2401-2 (Trimode),
D-2401-2UI (Ullage/Interface,
D-2401-2UT (Ullage/Temperature)
Tape Lengths: 50 FT., 75 FT., 100 FT, 120 FT and
15 Meter, 25 Meter, 30 Meter 37 Meter
Basic Gauging Tape Style: Steel, 0.375 wide x 0.006 thick,
yellow or white faced, black and red
graduation markings. Manufactured in
accordance with Federal Specification
GGG-T-106F.
System Linear Accuracy at 68°F: English Reading, ±1/8" of reading
plus ± 0.01% of total tape length.
Metric Reading, ±3MM of reading
plus +/- 0.01% of total tape length.
GENERAL STATEMENT OF LINEAR ACCURACY
MMC warrants that the above listed, newly produced equipment models, incorporating the listed basic gauging tape
style and lengths, will perform to the stated system accuracy.
Certification of accuracy for new equipment is available at extra cost. Certification cost to standards of accuracy
more precise than the stated system accuracy will be quoted upon request.
Page 2

1.2 SPECIAL FEATURES:
Conductive Tape Surface to Drain Off any Static Charge
Grounding Cable with Heavy Alligator Clamp
Watertight Electronics Construction with Sealed Switches
All Stainless Steel Fasteners
Nylon Coated Aluminum Reel Housing for Light Weight Portability
Low Battery Display Indicator
High Daylight Visibility with Liquid Crystal Display
Push-button Night Light
Rapid Multiple Temperature Measurements
IMO approved for oil/water interface Detection
Full stow “ Pop-up” button spring loaded Tape Wiper housing Gas Seal
Page 3

SECTION II
2.0 INTRODUCTION
2.1 The MMC Tri-Mode portable ullage, temperature and interface tape described
herein incorporates extremely accurate instrumentation to provide three vital
petroleum and other liquid tank measurements.
* Measurement of surface ullage level of oil or other fluids to an accuracy and repeat-
ability of ±1/8 inch.
* Determination of the exact location of the ullage level of the interface layer exists
when an oil-water mixture is contained within the same vessel.
* Measurement in either Degrees F or Degrees C of the temperature of the fluid within
a vessel, at any or several desired ullage levels, in rapid succession. Measurement is
given to the nearest 0.1 degree and is accurate to ±0.2°F over the calibrated
temperature ranges given in the specifications listed in Section I.
2.2 The MMC system utilizes a sensor suspended at the end of a fluoropolymer covered \
gauging tape wound on a reel assembly, The plastic covered steel gauging tape
contains two isolated side conductors to carry the signal and power to the electronic circuit
within the sensor barrel with the steel tape provides the ground return. The plastic surface of
the tape has been treated to make it sufficiently conductive to prevent the build-up of static
charges. Temperature indication is provided by a large digital liquid crystal display (LCD),
housed within a sealed reel driving assembly.
2.3 Ullage and interface detection is provided by an audible signal obtained from a horn in
the reel driving hub, when the bottom “U” gap in the sonic sensor is immersed in fluid. The
audible signal heard, will be a continuous tone in a non-conductive fluid such as oil,
gasoline, kerosene, etc., but will change to an interrupted tone when immersed in and fluid
which is electrically conductive, such as water.
2.4 The system is certified as intrinsically safe for electrical equipment in hazardous
atmospheres by Factory Mutual, BASEEFA /SIRA, CSA, and SAA.
2.5 The triple function temperature, interface, and ullage sensor is powered by a single 9 volt
battery contained within the hub assembly. Battery drain is extremely low, (Approximately
1-1/4 Mili-amperes in either the ullage, interface or the temperature mode), insuring very
long operation, without battery replacement. Low battery warning is provided at the upper left
corner of the temperature display LCD, when the battery voltage has dropped to a level that
would, with further operation, cause excessive errors in temperature readings.
Page 4

SECTION III
3.0. THEORY OF OPERATION
3.1 Drawing D-2562-1FRL illustrates the main components of the Ullage, Temperature and
Interface system. A tape reel contains the calibrated tape. The reel crank on the driving
hub is used by the operator to raise and lower the sensing head assembly which is
attached to the reel via the tape. Before lowering or raising the tape, the reel brass thumb screw
lock must be unlocked.
3.2 The sensor head assembly contains two piezo-electric crystals, a pair of interface or
conductivity pins, a temperature sensor, located in one of the conductivity pins and
electronic circuit board. The sensor is connected electrically to the driving hub electronics by the
two wires encased in the gauging tape plastic jacket, which covers and hermetically seals these
wires and centers graduated metallic gauging tape. The metallic tape is used as a ground return
conductor, which when including the two wires straddling it, form a rectangular three conductor
transmission cable.
3.3 The electronic circuits in the hub assembly are comprised of a LCD digital display which
provides temperature readings when the system is in the temperature mode; an analog to
digital converter; a power on-off switch; a mode switch which permits operator to select the
temperature mode or ullage/interface mode; a night light switch and ancillary electronic parts all
assembled on a printed circuit board. A 9 volt battery power source and audio horn are located
within the tape reel hub assembly below the P.C. board of the modular hub cover assembly.
3.4 When the system is placed in the ullage/interface mode, and as the sensor is immersed in
a non-conductive fluid such as oil, a sonic signal originated by the sensor head circuits
freely crosses the sensor gap and is detected, amplified and then transmission tape to the hub
electronics board, which in turn drives a horn in the turning drum assembly. A high pitched
continuous audible signal is then emitted. When the sonic sensor is in air, the sonic signal does
not cross the sensor gap and therefore, the horn is silent.
3.5 When the sonic sensor is immersed in a conductive fluid, such as the water layer side of
an oil/water interface operation is as above except that the conductivity pins within the sensor gap
now permit a minute current to flow between the pins. This current flow is detected by the sensor
electronic circuitry with the sensor housing and suitability conditioned to cause the sonic signal to
be periodically interrupted, yielding a “beeping” tone for operator identification.
3.6 When the system is placed in the temperature mode the ullage and interface circuits with-
in the sensor barrel are de-energized, also disengaging the audio signals associated with the
ullage/interface mode. The integrated circuit temperature sensor housed within the grounded
interface pin now functions as an extremely accurate linear temperature to current transducer. As
the temperature at the sensor rises, so does the temperature sensor current. By passing the
temperature sensor current via the transmission tape, though the electronic component network,
with the turning drum, input to an A to D converter is caused to vary linearly with temperature.
Span control (R18) is adjusted to provide a fixed reference voltage, to scale for either a
Centigrade or Fahrenheit reading device. Coded digital output from the A to D converter to the
LCD Display is used to prove accurate and fast temperature readings.
Page 5

The two potentiometer controls, R13 and R18, perform as a two point temperature
calibration adjustment.
A complete temperature calibration procedure is later described in this manual. (See
Section VIII).
Temperature re-calibration is recommended at yearly intervals. Please note that units
returned
Temperature Calibration during standard or extended warranty periods are not covered by
warranty statement.
Page 6