Honeywell HERMetic UTImeter Gtex Operation manual

50461/GTEX MMC/1111 1 UTImeter Gtex MMC
Operation and Service Manual
for HERMetic UTImeter Gtex
MMC adaptors
for use in non corrosive liquids
Portable Gas Tight Electronic Gauging Device
Ullage - Temperature - Interface detector
Note 1: to identify the unit
refer to section 2
Note 2: before using the
instrument please
read this book.
This document is subject to changes without notice.
Check updates on www.tanksystem.com or contact us at [email protected]
Tank top
Ullage level
Interface level
Wate
Produc
Vapou
Zero reference level
H
H

50461/GTEX MMC/1111 2 UTImeter Gtex MMC
1. Table of contents
1. TABLE OF CONTENTS .................................. 2
2. IDENTIFICATION OF YOUR EQUIPMENT
4
2.1 SERIAL NUMBER ........................................... 4
2.2 ABBREVIATIONS........................................... 4
3. GENERAL INFORMATION........................... 5
3.1 SHIPMENT NOTE............................................ 5
3.2 INITIAL INSPECTION...................................... 5
3.3 DOCUMENTATION DISCREPANCIES................ 5
3.4 WARRANTY.................................................. 5
3.5 CERTIFICATION............................................. 6
3.6 SPARE PARTS ................................................ 6
3.7 SERVICE AND REPAIR ................................... 6
4. WORLDWIDE SERVICE STATIONS
NETWORK................................................................ 8
5. RECOMMENDATION FOR SAFE USE ..... 11
6. FUNCTIONS - KEY FEATURES .................12
7. DESCRIPTION ............................................... 13
7.1 GENERAL.................................................... 13
7.2 ULTRA SENSING PROBE............................. 15
7.2.1 Introduction ....................................... 15
7.2.2 Ullage detection................................. 15
7.2.3 Interface detection ............................. 16
7.2.4 Temperature measurement ................ 16
7.3 TAPE........................................................... 17
7.4 TAPE PROTECTION ...................................... 18
7.5 READING INDEX.......................................... 19
7.6 TAPE CLEANER ........................................... 20
7.7 GAS TIGHTNESS .......................................... 21
7.8 GASKETS .................................................... 21
7.9 ADDITIONAL LOAD (OPTION)...................... 21
7.9.1 Viscous liquids (> 800 Cst) ............... 21
7.9.2 Reference height and innage.............. 21
7.10 HOUSING AND LID....................................... 21
7.11 OTHERS ...................................................... 21
8. EXAMPLES OF INSTALLATION OF THE
GAUGING SYSTEM.............................................. 22
8.1 GENERAL.................................................... 22
8.2 INSTALLATION............................................ 22
9. OPERATION................................................... 25
9.1 BASIC RULES CONCERNING THE 5-KEY
CONTROL PAD .........................................................25
9.2 SELECTING THE LANGUAGE ........................26
9.3 SELECTING THE TEMPERATURE SCALE ........27
9.4 SELECTING THE TEMPERATURE RESOLUTION
28
9.5 ACTIVATING THE LED................................29
9.5.1 Temporary setting of the LED............29
9.5.2 Permanent setting of the LED............29
9.6 MUTING THE BUZZER..................................30
9.7 BACKLIGHT.................................................30
9.8 CHECKING THE FUNCTIONS BEFORE USING
THE INSTRUMENT....................................................31
9.8.1 Battery................................................31
9.8.2 Temperature.......................................31
9.8.3 Ullage.................................................31
9.8.4 Interface.............................................31
9.9 INSTALLATION OF THE INSTRUMENT ...........32
9.10 PURGING THE EQUIPMENT...........................32
9.11 ULLAGE/INTERFACE MEASUREMENT...........32
9.12 REFERENCE HEIGHT /INNAGE MEASUREMENT
33
9.13 TEMPERATURE MEASUREMENT...................34
10. CARE AND MAINTENANCE...................35
10.1 CARE ..........................................................35
10.2 CHECKING THE BATTERY ............................36
10.2.1 Before starting gauging .....................36
10.2.2 During gauging..................................37
10.3 BATTERY REPLACEMENT ............................38
10.4 TAPE REPLACEMENT ...................................39
10.4.1 Disconnecting the tape from the sensor
39
10.4.2 Disconnecting the tape from the
electronic box.....................................................39
10.4.3 Disconnecting the tape from the reel
axle 40
10.4.4 Removing the tape from the housing..40
10.4.5 Mounting the new tape.......................40
10.5 SENSING PROBE REPLACEMENT...................41
10.5.1 Disconnecting the old sensing probe.41
10.5.2 Connecting the new sensing probe.....41
10.6 TAPE WIPERS REPLACEMENT.......................41
10.7 DISPLAY UNIT REPLACEMENT .....................42
10.7.1 Disconnecting the old display unit.....42
10.7.2 Connecting the new display unit........42
10.8 VERIFICATION AND CERTIFICATION OF TAPES
42

50461/GTEX MMC/1111 3 UTImeter Gtex MMC
10.9 VERIFICATION AND ADJUSTMENT OF THE
READING INDEX ...................................................... 43
10.10 TEMPERATURE VERIFICATION................. 44
10.10.1 Equipment required ....................... 44
10.10.2 Preparing the Ice Point bath .........44
10.10.3 Checking the UTImeter.................. 44
10.11 ULLAGE/INTERFACE VERIFICATION ........ 45
11. TROUBLE SHOOTING............................. 46
11.1 SAFETY WARNING....................................... 46
11.2 POWER SUPPLY TROUBLES.......................... 46
11.3 TRANSMISSION TROUBLES .......................... 46
11.4 ULLAGE AND/OR INTERFACE TROUBLES ..... 47
11.5 TEMPERATURE TROUBLES .......................... 47
11.6 VISUAL INSPECTION FOR DAMAGED OR
MISSING PARTS ....................................................... 47
11.7 COATED ALUMINIUM PARTS........................ 48
11.8 WINDING ACTION BECOMING STIFF............. 48
11.9 ELECTRICAL CHECKING OF THE TAPE
ASSEMBLY .............................................................. 48
12. SPECIFICATIONS ..................................... 49
13. SPARE PARTS............................................ 50
13.1 HOW TO PROCEED....................................... 50
13.2 LIST OF PARTS DESCRIPTIONS ..................... 50
13.3 SPARE PARTS DRAWINGS &DECLARATION OF
CONFORMITY.......................................................... 52

50461/GTEX MMC/1111 4 UTImeter Gtex MMC
2. Identification of your equipment
2.1 Serial number
Each HERMetic instrument is individually
identified with a 6 digits serial number starting
with the letter G, example G10058. This serial
number is printed on the identification plate that is
located on top of the handle. See Figure 2-1.
Identification plate
Figure 2-1
2.2 Abbreviations
Some abbreviations are used to define the equipment.
Abbreviation Meaning
ETCE Special PTFE used for extruding
FFKM Perfluoro rubber, special for chemical applications
FKM (Viton) Fluoro rubber for crude oil and some products applications
Gtex Gas tight mechanical housing for non corrosive liquids, i.e. with FKM gaskets
and PA 11 coating (blue)
Gtex Chem Gas tight mechanical housing for corrosive liquids, i.e. with FFKM gaskets and
PA 11 coating (blue)
NBR Acrylonitrile-butadiene rubber (nitrile rubber)
PA 11 (Rilsan) Polyamid coating (blue, grey or yellow) used for protecting aluminium against
liquids
PE Polyethylene
PEHD Polyethylene High Density
PFA Perfluoro alkoxyl alkane
PTFE Polytetrafluoroethylene
Q1 Connector 1”
Q2 Connector 2”
SS1 Stainless steel Storage tube 1”
SS2 Stainless steel Storage tube 2”
TEFZEL ETFE coating of the tape
ULTRA Ultrasonic sensing probe, second generation, covering a wide range of liquids
from crude oil to light products, chemicals and heavy/viscous liquids
UTI Stands for: U (ullage), T (temperature), I (oil/water interface)
Visc Additional load on the sensing probe for innage measurement or gauging
viscous liquids

50461/GTEX MMC/1111 5 UTImeter Gtex MMC
3. General information
3.1 Shipment note
The following parts should be included in the
shipment:
-1 instrument fitted out with one battery in the
display;
-1 set of 4 Allen keys: 1.5, 2, 2.5 and 3 mm;
-1 Operation and Service Manual.
3.2 Initial inspection
Check the contents of the shipment for
completeness and note whether any damage has
occurred during transport. Carry out the “Initial
test before installing the instrument” to verify the
good functioning. If the contents are incomplete,
or if there is a damage, do not use the device. A
claim should be filled with the carrier immediately,
and Enraf Tanksystem SA Sales or Service
organization should be notified in order to
facilitate the repair or replacement of the
instrument.
3.3 Documentation discrepancies
The design of the instrument is subject to
continuous development and improvement.
Consequently, the instrument may incorporate
minor changes in detail from the information
contained in the manual.
3.4 Warranty
Three (3) years after installation but max. 42
months after delivery ex works except
batteries.
The Vendor undertakes to remedy any defect
resulting from faulty design materials or
workmanship. The Vendor's obligation is
limited to the repair or replacement of such
defective parts by his own plant or one of his
authorized service stations. The Purchaser
shall bear the cost and risk of transportation
of defective parts and repaired parts supplied
in replacement of such defective parts.
When returned to Enraf Tanksystem SA or any
of its agreed Service Stations equipment must
be contamination-free. If it is determined that
the Purchasers equipment is contaminated, it
will be returned to the Purchaser at the
Purchasers expense. Contaminated
equipment will not be repaired, replaced, or
covered under any warranty until such time
that the said equipment is decontaminated by
the Purchaser.
The Purchaser shall notify by fax, telex or in
writing of any defect immediately upon discovery,
specifying the nature of the defect and/or the
extend of the damage caused thereby.
Where no other conditions have been negotiated
between the Vendor and the Purchaser "General
Conditions 188" of United Nations shall apply.
This instrument has been certified as Intrinsically
Safe Instrumentation for only those classes or
categories of hazardous areas stated on the
instrument label, bearing the mark of the
applicable approval authority. No other usage is
authorized.
Unauthorized repair or component replacement
by the Purchaser will void this guarantee and may
impair the intrinsic safety of the instrument. In
particular it is not allowed to repair electronic
circuits.
In no event shall Enraf Tanksystem SA be liable
for indirect, incidental or consequential loss or
damage or failure of any kind connected with the
use if its products or failure of its products to
function or operate properly.
Enraf Tanksystem SA do not assume the
indemnification for any accident or damage
caused by the operation of its product and the
warranty is limited to the replacement of parts or
complete goods.

50461/GTEX MMC/1111 6 UTImeter Gtex MMC
3.5 Certification
The equipment has been approved for the
electrical intrinsic safety by the following
authorities :
IECEx
Zone 0 Ex ia IIB T4 20°C < Ta < +50°C
Standards used:
IEC 600790, Fourth Edition 200401,
IEC 6007911, Fifth Edition 200607
IEC 6007926, First Edition 200403
ATEX
II 1 G EEx ia IIB T4 / Tamb. 50 °C
Standards used:
EN50014, (1997) + Amds 1 & 2
EN50020, (2002)
EN50284, (1999)
Regarding product compliance against standards
updates or new standards, please refer to the
Declaration of conformity.
Factory Mutual (FM Approvals)
CL I, DIV 1, GP C&D, T4 Tamb. 50 °C and
CL I, ZN 0, AEx ia IIB T4 Tamb. 50 °C
The equipment has been approved as oil/water
interface detector according to MARPOL
Resolution MEPC.5(XIII) of 13 June 1980 by
National Maritime Authorities and/or Classification
Societies.
If you need a copy of any of these certificates
please contact:
Enraf Tanksystem SA
Rue de l'industrie 2
1630 Bulle, SWITZERLAND
Telephone : [phone]
Telefax : [phone]
Web site : www.tanksystem.com
E-mail : [email protected]
3.6 Spare parts
When ordering spares identify the spare part by
TS number and description. Refer to section
“Drawings”.
Some spares might be repairable; in this case
send the part(s) to any authorised service center
or to the factory.
In case of urgency, complete replacement units
can be made available. Contact the factory or
nearest Service Station for details.
3.7 Service and Repair
The customer is responsible for any freight and
customs clearance charges. If units are sent on a
"freight collect" the charges will be invoiced to the
customer.
When returning units or parts for repair to the
factory please fill out a service request form (see
next page). The serial number (letter "G" followed
by 5 digits) is printed on the identification plate as
shown on the Figure 2-1.
When returned to Enraf Tanksystem SA
equipment must be contamination-free. If it is
determined that the customers equipment is
contaminated, it will be returned to the
customer at the customers expense.
Contaminated equipment will not be repaired
until such time that the customer
decontaminates the said equipment.
Enraf Tanksystem SA is
an ISO 9001 certified
company by QMI and
MED-D by Det Norske
Veritas Certification
GmbH.

50461/GTEX MMC/1111 UTImeter Gtex MMC
7
Service Request
Customer's address: ..............................................................................
................................................................................................................
................................................................................................................
................................................................................................................
................................................................................................................
Telephone: ..............................................................................................
E-mail: .....................................................................................................
Fax: .........................................................................................................
Type of unit or part: .................................................................................
.................................................................................................................
Serial number: .........................................................................................
Short description of trouble: .....................................................................
..................................................................................................................
..................................................................................................................
..................................................................................................................
Do you want a quotation before repair is started:..........yes / no.............
Repaired unit has to be returned to the following address:
..................................................................................................................
..................................................................................................................
..................................................................................................................
..................................................................................................................
..................................................................................................................

50461/GTEX MMC/1111 UTImeter Gtex MMC
8
4. Worldwide Service Stations network
The updated list can be found on our website www.tanksystem.com
COUNTRY ADDRESS TELEPHONE/FAX/E-MAIL
SWITZERLAND ENRAF TANKSYSTEM SA
2, rue de l'Industrie
CH-1630 BULLE
Tel : [phone]
Fax : [phone]
[email protected]
CANADA PYLON ATLANTIC
A Div. Of Pylon Electronics Inc.
31 Trider Crescent.,
DARTMOUTH, N.S. B3B 1V6
Tel : [phone]
Fax : [phone]
[email protected]
CHINA HUA HAI EQUIPMENT & ENGINEERING
CO LTD
Factory 7, Lane 1365, East Kang Qiao Road
Kang Qiao Industrial Zone, Pu Dong
SHANGHAI, P.C. 201315
Tel : [phone]
Fax : [phone]
[email protected]
GERMANY CHRISTIAN BINDEMANN MARINE
CONSULTING
Antonie-Möbis-Weg 4
HAMBURG 2523
Tel : [phone]
Fax : [phone]
[email protected]
GREECE SPANMARIN
86, Filonos Street
GR-185 36 PIRAEUS
Tel : [phone]
Fax : [phone]
[email protected]
JAPAN DAIWA HANBAI CORPORATION LTD
2-10-31, Mitejima, Nishiyodogawa-ku
OSAKA 555-0012
Tel : [phone]
Fax : [phone]
[email protected]
KOREA World Ocean CO., LTD
Rm1001, Hae-deok Bldg., 1212-11
Choryang-dong Dong-Gu
BUSAN
Tel : [phone]
Fax : [phone]
[email protected]
MEXICO URBAN DEL GOLFO S.A. DE C.V.
Ave. Ejército Mexicano 1902
Col. Loma del Gallo
89460 CD. MADERO, TAMPS. MEXICO
Tel : [phone]
Fax : [phone]
[email protected]
NETHERLANDS B.V. TECHNISCH BUREAU
UITTENBOGAART
Brugwachter 13
NL-3034 KD ROTTERDAM
Tel : [phone]
Fax : [phone]
[email protected]

50461/GTEX MMC/1111 UTImeter Gtex MMC
9
The updated list can be found on our website www.tanksystem.com
COUNTRY ADDRESS TELEPHONE/FAX/E-MAIL
PORTUGAL CONTROLIS
Soc. Com. Equipamentos de Controlo, Lda.
Rua Conceiçao Sameiro Antunes, 26E
2800-379 COVA DA PIEDADE
Tel : [phone]
Fax : [phone]
[email protected]
RUSSIA NPP "GERDA"
Vilisa Latsisa str. 17
Building 1
125480 MOSCOW
Tel : [phone]
Fax : [phone]
[email protected]
SINGAPORE HUBBELL INT'L (1976) PTE LTD
322 Thomson Road
SINGAPORE 307665
Tel : [phone]
Tel : [phone]
Fax : [phone]
[email protected]
SPAIN E.N.I.
Electronica y Neumatica Industrial, S.A.
C/Jon Arrospide, 20 (Int.)
48014 BILBAO
Tel : [phone]
Fax : [phone]
[email protected]
SWEDEN INSTRUMENTKONTROLL
Lars Petersson AB
Varholmsgatan 1
414 74 GÖTEBORG
Tel : [phone]
Tel : [phone]
Fax : [phone]
[email protected]
TURKEY YEDI DENIZ
Setustu, Izzetpasa Yok.1
TR 34427 Kabatas ISTANBUL
Tel : +90.212.251 64 10 / 3 lines
Fax : +90.212.251 05 75
[email protected]
[email protected]
UNITED ARAB
EMIRATES
MARITRONICS TRADING L.L.C.
P.O. Box 6488
Shed # 72, Jadaf Ship Docking Yard
DUBAI
Tel : [phone]
Fax :[phone]
[email protected]
UNITED
KINGDOM
ENERGY MARINE (INTERNATIONAL) LTD.
12 Clipstone Brook Industrial Estate
Cherrycourt Way
LEIGHTON BUZZARD, BEDS LU7 4TX
Tel : [phone]
Fax :[phone]
[email protected]
U.S.A / TEXAS HONEYWELL HERMETIC
4522 Center Street
DEER PARK, TX 77536
Tel : [phone]
Fax : [phone]
Toll free call in the USA:
1-800-900 1778
[email protected]

50461/GTEX MMC/1111 UTImeter Gtex MMC
10

50461/GTEX MMC/1111 UTImeter Gtex MMC
11
5. Recommendation for safe use
1. This Operation and Service Manual is a guide in order to help the user to operate the instrument to our
best knowledge.
2. Nevertheless the maker disclaims all responsibility and liability for damage resulting from the use of the
equipment regardless of the cause of the damage.
3. Attention is drawn to the possible hazard due to electrostatic charges which may be present in
the tank. This may happen in particular with static accumulator liquids, i.e. liquids which have low
conductivity of 50 picoSiemens/metre (pS/m) or less.
4. It is very important that the instrument is grounded to the tank before the probe is introduced into
the tank and remains grounded until after complete withdrawal from the tank.
4.1. If the instrument is installed with the quick connect coupler, grounding is effected through the quick
connect coupler and the mating nipple of the valve provided that these parts are kept clean and free
from corrosion in order to guarantee electrical conductivity. If a grease is used for this purpose, it
must be one which contains graphite.*
4.2. If the instrument is not connected to the mating deck valve *, the instrument has to be also* earthed
by means of the grounding cable and clamp.
*WITH MMC APDAPTORS THE USE OF THE GROUNDING CABLE IS MANDATORY.
5. It is anticipated that the user will have specific operating methods laid down to ensure safety
when using this type of apparatus. In this case the user's instructions shall be strictly observed.
6. In the absence of such instructions the following should be noted:
6.1. If a metal sounding pipe is fitted beneath the deck valve or tank is inerted, then ullaging, etc. is
permissible at any time with no restriction.
6.2. If there is no sounding tube or tank is not inerted, the following precautions shall be taken:
6.2.1. If the cargo is not a static accumulator liquid, i.e. its conductivity is more than 50 pS/m, then
ullaging is permitted provided that the instrument is properly grounded and earthed before
the probe is inserted into the tank and remains earthed until the probe has been removed
from the tank.
6.2.2. If the cargo is a static accumulator liquid, i.e. its conductivity is less than 50 pS/m, then
ullaging is permitted provided that:
6.2.2.1. The instrument is properly grounded and earthed before the probe is inserted into
the tank and remains earthed until the probe has been removed from the tank.
6.2.2.2. The apparatus is not introduced into a tank until at least 30 minutes have elapsed
after completion of any loading operation or stopping the injection of inert gas.
6.3. For further guidance refer to International Safety Guide for Oil Tankers and Terminals (ISGOTT),
ISBN 1 85609 291 7, Fith Edition 2006, or consult the appropriate Legislative Authority for the
installation.
7. Warning: change of battery must be carried out in safe area only (non flammable atmosphere).
8. This product and his use is / may be related to international, national, local or company
regulations or standards. It is the customer / user responsibility to ensure that the way to use the
device complies with such applicable regulations or standards.
9. This device is a portable product. It must not be permanently installed on the tank and must be
disconnected after use and stored in a safe and dry area.

50461/GTEX MMC/1111 UTImeter Gtex MMC
12
6. Functions - Key Features
This HERMetic instrument is a gas-tight portable
multiple functions gauging system that is
designed to perform under completely closed
conditions in a single operation 3 measurements:
a) Ullage (outage). Optionally innage is available¹.
b) Oil/water Interface level.
Tape resolution: 1 mm (1/16 ")
Tape accuracy: ±1.5 mm for 30 m
(±1/16 " approx. for 100 feet)
Ullage/interface detection accuracy:
±2 mm (±0.08 " approx.)
Minimum detectable tank bottom interface or
liquid level: 4 mm (0.16" approx.).
c) Temperature by continuous reading at any
level.
Ambient temperature range: -20°C to 50°C
( -4°F to 122°F)
Sensor measurement range:-40°C to 90°C
( -40°F to 194°F)
Resolution: 0.01° or 0.1°, selectable
Accuracy over calibration range: ±0.1°C (0°C to
70°C); ±0.2°F (32°F to 158 °F)
Temperature reading: °C or °F, selectable.
This HERMetic device meets the requirements of
API MPMS Chapter 7 2001, table 3, ISO 4268
and IP PMM Part IV.
Thanks to the small diameter of the sensing probe
this instrument can be used with valves of
diameters down to 25 mm (1”) only.
A tape protection tube prevents closing the valve
on the tape through inadvertence.
Gauging is done under completely gas tight
conditions therefore maintaining over- or
underpressure in the tank. The device is designed
to withstand tank pressure up to 0.3 bar (4.4 psi).
¹ An additional device, usable with 2” valves only,
can be provided that allows Reference Height
and Innage measurement. Available on “Visc”
models.
Tank top
Ullage level
Interface level
Water
Product
Vapour
Zero reference level
HI
HV

50461/GTEX MMC/1111 UTImeter Gtex MMC
13
7. Description
7.1 General
Each HERMetic instrument is individually
identified with a 6 digits serial number starting
with the letter G, example G10058. This serial
number is printed on the identification plate as
shown on Figure 7-1.
The HERMetic instrument is fitted with an ULTRA
sensing probe.
The unit emits control beep, continuous beep and
intermittent beep.
When the sensing probe is surrounded by air, a
control beep occurs every 2 sec.
When the sensing probe is in contact with any
petroleum product, the beep is continuous.
When the sensing probe is in contact with water
the beep is intermittent.
Control beep • •
Continuous beep • • • • • • • • • •
Intermittent beep • • • • • •
A light signal (LED) can also be activated that
blinks at the same frequency as the buzzer tones.
This can be useful in noisy environments or at
night.
A backlight can be used at night to light up the
display.
The HERMetic instrument is powered by a 9 Volt
battery stored in the electronic terminal named
instrument unit. Current consumption is very low,
ensuring long operation without battery
replacement. A continuous tone means that the
battery needs replacement. If the battery power
is too low, it is no more possible to read the
temperature.
Maintenance is easy because design is modular
and allows quick exchange of parts.
See also Figure 7-2 to get to know the equipment.
identification plate
serial number
Figure 7-1

50461/GTEX MMC/1111 UTImeter Gtex MMC
14
Tape cleaner
Reading index
Buzzer
Tape
Sensing probe ULTRA
Tape adaptor
Display
Display unit
LED
Identification plate
Crank
5 keys pad
Tube TS 55152
height 12 1/8" / 308 mm
height 322 mm / 12.68"
Visc: device for
innage measurement
height 6" / 152 mm
Tube TS 55160 / ANK 52
Tube TS 55149
height 6" / 152 mm
Tube TS 55155
Figure 7-2

50461/GTEX MMC/1111 UTImeter Gtex MMC
15
7.2 ULTRA sensing probe
7.2.1 Introduction
The ULTRA sensing probe consists of a
stainless steel tube terminated by a high-
tech plastic head which cannot be
removed from the tube. The sensing
probe includes an ultrasonic liquid level
sensor, a temperature sensor and a
conductivity electrode. The sensitivity for
ullage and interface measurement is not
adjustable. The temperature
measurement is calibrated at the factory
and does not require subsequent
adjustment.
7.2.2 Ullage detection
The ullage detector consists of two
piezoceramic plates and electronic
circuits. When the sensor head is
immersed in a non-conductive liquid (oil
or petroleum), the emitted ultrasonic
signal is detected by the receiver, coded
and sent to the instrument unit which
activates the buzzer with the continuous
beep.
1
6
012345
0
1
12
1
Reaction point
Ultrasonic level sensor
4 mm
Air
Liquid
Figure 7-3
The reaction point is located 4 mm (5/32") from the sensor bottom and identical with the zero-point of the tape graduation.

50461/GTEX MMC/1111 UTImeter Gtex MMC
16
7.2.3 Interface detection
The principle consists of a conductivity
measurement between an active
electrode and a grounded electrode.
When the liquid is conductive (as water),
the ullage sensor detects the presence of
the liquid as well and the conductivity
electrodes and associated electronic
circuits modulate the coded signal to
generate the intermittent beep.
1
6
012345
0
1
12
1
Interface level
Interface sensor
4 mm
Water
Oil
Air
Oil
Figure 7-4
The reaction point is located 4 mm (5/32") from the sensor bottom and identical with the zero-point of the tape graduation.
7.2.4 Temperature measurement
The sensing element is a Platinum Resistance
Temperature Detector (RTD) element. The
element is located in the temperature electrode,
which is filled in with a heat transfer compound
paste to reduce the response time.
The RTD element signal is digitized, and then all
errors (offset, non-linearity and drift) are corrected
and compensated by the micro-controller located
in the sensor probe. The RTD element
characteristics are stored in the sensor memory
and are dedicated to one sensor. For this reason,
changing a sensor does not require a new
calibration.
All data are serialised and sent by the micro-
controller to the Display Unit.
Temperature settings (resolution, scale) are easy
to select by pressing the 5-key control panel.
1
6
012345
0
1
12
1
Temperature level
Temperature sensor
4 mm
Liquid
Air
Figure 7-5
The reaction point is located 4 mm (5/32") from the sensor bottom and identical with the zero-point of the tape graduation.

50461/GTEX MMC/1111 UTImeter Gtex MMC
17
7.3 Tape
The ETFE (TEFZEL) coated tape provides 3 main
functions :
It holds the sensing probe.
It is graduated and therefore makes it possible
to determine the distance between the reaction
point and the reading index. If the reading
index is set up at the zero ullage level, the
reading of the tape is identical to the ullage.
It contains 2 wires for transmitting the signal
and the power between the display unit and
the probe. The steel tape itself is used as a
grounding wire between the sensing probe
tube and the display unit.
TEFZEL STEEL TAPE WIRE
Figure 7-6
The standard graduation is a double side type that shows the metric graduation on one side and the inch
one on the other side. The tape is mounted on the equipment according to the need.
34
23
10 11 12 13 14 15
7
7
5
23
9
23
metric sideinch side
Figure 7-7

50461/GTEX MMC/1111 UTImeter Gtex MMC
18
7.4 Tape protection
The tape protection tube is a mechanical safety
device which prevents the valve from being
closed as long as the sensing probe is inside the
tank. When the sensing probe is lowered the
protection tube will follow the sensing probe by
gravity until the tube is retained by a ring located
inside the coupler. In that position the protection
tube prevents closing the valve. When the tape is
wound up the protection tube will stay in position
until it is pushed up by the sensing probe. Before
instrument is used check that the protection tube
is moving freely. For cleaning purposes the
protection tube is slotted.
VALVE CLOSED VALVE OPEN
TAPE PROTECTION TUBE
STORAGE TUBE
SENSOR
RETAINER
QUICK CONNECT
COUPLER
BALL VALVE
Figure 7-8
UNFORTUNATELY THE MMC DESIGN IS NOT
COMPATIBLE WITH THE CONCEPT OF THE TAPE
PROTECTION TUBE.
THEREFORE PLEASE MIND NOT CLOSING THE
MMC VALVE ON THE TAPE.

50461/GTEX MMC/1111 UTImeter Gtex MMC
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7.5 Reading index
Zero ullage
Reference level of tank
Liquid level
Reaction point
100
200
300
400
500
600
700
800
900
1000
1100
1200
0
1300
Figure 7-9
The tape reading at the height of the reading
index of the instrument is indicating the distance
between the reaction point and the reading index.
If the instrument is installed in such a way that the
reading index is at the same level as the zero-
ullage reference level the reading of the tape
corresponds to the ullage providing the reaction
point of the sensing probe is positioned at the
liquid level.
If the reading index is positioned below or above
the reference level a positive or negative
correction of the tape reading is necessary.
See also chapter 8 “Examples of installation of the
gauging system”.

50461/GTEX MMC/1111 UTImeter Gtex MMC
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7.6 Tape cleaner
This HERMetic equipment is fitted with a tape
cleaner that helps draining the liquid back to the
tank when rewinding the tape. It is very easy to
operate:
-position "DOWN": the wipers are not working,
the tape is free;
-position "UP": the wipers are cleaning the
tape.
Refer to Figure 7-10.
Tape cleaner DOWN = wipers not engaged
Tape cleaner UP = wipers engaged
Figure 7-10