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MMC INTERNATIONAL CORP.
OPERATING AND MAINTENANCE
INSTRUCTIONS
OXYGEN LEVEL SENSOR
GAUGING TAPE
CLOSED AND RESTRICTED APPLICATIONS
MODEL D-2615-11
APPROVED BY:
BASEEFA AS
INTRINSICALLY SAFE
FOR USE IN
CLASS I, DIVISION I, GROUPS C & D
HAZARDOUS ENVIRONMENTS
MMC INTERNATIONAL CORP.
60 INIP DRIVE
INWOOD, NEW YORK 11096
DRAWING FILE NO A-2615-60
October 2018
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Summary of Contents for MMC D-2615-11
- Page 1 MMC INTERNATIONAL CORP. OPERATING AND MAINTENANCE INSTRUCTIONS OXYGEN LEVEL SENSOR GAUGING TAPE CLOSED AND RESTRICTED APPLICATIONS MODEL D-2615-11 APPROVED BY: BASEEFA AS INTRINSICALLY SAFE FOR USE IN CLASS I, DIVISION I, GROUPS C & D HAZARDOUS ENVIRONMENTS MMC INTERNATIONAL CORP.
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Page 2: Table Of Contents
TABLE OF CONTENTS SECTION PAGE NO. ………………………………………………………………….. GENERAL 1.0 Specifications………………………………………………………... 1.2 Special Features……………………………………………………… …………………………………………………………….. INTRODUCTION III. …………………………………………………… THEORY OF OPERATION 5,6,7 ………………………… REQUIRED CONDITION & RECOMMENDED USAGE 4.1 Required Condition…………………………………………………… 4.2 Recommended Safe Usage Conditions……………………………….. 4.3 Fluid Level (Ullage) of Tank or Other Vessel………………………… ………………………………………………………………….. - Page 3 CONTINUED TABLE OF CONTENTS VIII. FAULT FINDING……………………………………………………………… 18,19 APPENDIX…………………………………………………….……………… LIST OF APPLICABLE DRAWINGS……………………………………….
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Page 4: General
SECTION I GENERAL SPECIFICATION: Oxygen Sensor Measurement Range………………… 0% to 25 % Accuracy over the 1% to 25% range ………………… ± 0.2% Batteries for intrinsically Safe Operation…………….. 9 Volt Eveready # 522 Only (supplied) or Mallory #MN1604 Battery life……………………………………………. Approximately 1000 Hours (Depends on night light use) Battery Drain (Display Night Light off)………………. -
Page 5: Special Features
SPECIAL FEATURES 1.2.1 Simple automatic push button calibration in air. 1.2.2 Audible (Horn) and visual (Red LED) indication is provided to designate that the gaseous mixture within a particular tank or vessel contains oxygen concentration greater than 8%. Note: For the Intended application area of this device, oxygen content percentages of 8% or less are considered non-explosive. -
Page 6: Introduction
2.0.3 The MMC system uses 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 ground from the electronic circuit within the sensor barrel to conditioning electronics in the reel hub. - Page 7 2.0.4 In addition to the LCD display described above, which provides accurate reading of percent oxygen, the MMC tape also incorporates a pulsating horn and a light emitting diode (LED), to provide a visual and audible alarm indications of unsafe conditions, specifically, that oxygen content is above an 8% by volume level.
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Page 8: Theory Of Operation
SECTION III THEORY OF OPERATION 3.0.1 Drawing S-2615-OCX illustrates the main components of the oxygen sensor. A tape reel accommodates the gauging tape when fully wound. A tape reel crank is used by the operator to raise and lower the oxygen sensing head assembly, which is attached to the reel via the tape. - Page 9 3.0.6 It is important not to attempt calibration of the unit when the sensor is in a petroleum tank, or in other than a normal air environment. It is also desirable to perform the calibration at room temperature (70 to 80 degrees F). The later condition is not a requirement, but will in general, results in greater accuracy.
- Page 10 3.0.12.0 The red LED lamp serves two purposes. 3.0.12.1 The first purpose is to act as a simple power on indicator in normal air during day and night time use. This feature is important at night since an operator may not be aware that automatic shut-off has occurred, and attempt a gauging procedure.
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Page 11: Required Condition & Recommended Usage
SECTION IV 4.0. REQUIRED CONDITION AND RECOMMENDATIONS FOR SAFE USAGE 4.0.1 The attention of the user of this apparatus is drawn to the possible hazards of oxygen sensing within flammable environments normally found above confined petroleum liquids, which are also known to be generators of the static electricity, and which are not covered with an Inert gas blanket. -
Page 12: Fluid Level (Ullage) Of Tank Or Other Vessel
4.3.0 FLUID LEVEL (ULLAGE) OF TANK OR OTHER VESSEL WHICH IS TO BE GAUGED FOR OXYGEN PERCENT LEVEL 4.3.1 Before entering the free space above a liquid level, the level of the fluid contained within the tank or vessel should be known. If the location of fluid level is not known, it should be determined by suitable and reliable means. -
Page 13: Operation
Before entering a tank with the oxygen sensor it is important the ullage level of the fluid within the tank be known by using a MMC ullage gauging tape or other gauging device. The oxygen sensor should not be arbitrarily lowered into a tank... - Page 14 Page 11...
- Page 15 In the case of use with an MMC vapor valve, secure the threaded barrel cap to the vapor valve, then open the valve. Loosen the reel lock located below the handle on backside of the tape reel frame.
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Page 16: Oxygen Sensor Cell Life
5.2.11 CAUTION When the Oxygen sensor is withdrawn from a tank with a low oxygen gaseous environment and subsequently rewound into its storage barrel, it usually takes at least 10 minutes for the oxygen in normal air to replace the inert gas captured in the sensor storage barrel. -
Page 17: Care And Maintenance
6.0.4 Make sure before lowering the sensor into a tank, that the tank product level is known, so that the sensor is not immersed in the product. Before lowering the oxygen sensor, always obtain an accurate ullage reading by using an MMC ullaging tape or similar device. (See Section 5.0). -
Page 18: Oxygen Cell Replacement
OXYGEN CELL REPLACEMENT 6.2.1 The oxygen cell, located within the sensor barrel, has a life expectancy of at least one year. The cell is similar to battery except unlike a battery, it produces a current which is directly proportional to level of oxygen it senses in a gaseous environment. - Page 19 6.3.12 Pull the tape away to the hub by reverting hub reel through the tape wiper housing, and out through the slot in the side of the reel hub. 6.3.13 Attach a new tape to hub by reversing the above the procedure making sure that the tape numerals face in the same direction as the previous tape numerals faced.
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Page 20: Calibration Procedures
SECTION VII CALIBRATION PROCEDURE 7.0.1 The Oxygen Sensor and associated electronic have been accurately calibrated at factory. The oxygen cell used and the electronic circuits are extremely stable and in general require calibration only when the 9-volt battery or the oxygen cell is replaced. 7.0.2 A simple way to perform push button calibration has been incorporated in the design which permits the operator to quickly bring the system into calibration using the oxygen content of normal air (20.9%),±0.2% as standard. - Page 21 VIII SECTION FAULT FINDING: 8.0.1 The following section covers only simple faults that may occur. No attempt has been made in this section to cover highly technical faults. 1: Unit does not turn on when power “ON/OFF” switch is depressed. PROBLEM PROCEDURE &...
- Page 22 EXPLANATION: Horn may be badly corroded. Comparator is not functioning properly. Return to MMC or authorized service center for repair CAUTION This equipment is an approved intrinsically safe device. The factory of approved service centers may only make circuitry repair. Unauthorized repairs will void any guarantee or warranty given elsewhere in this manual.
- Page 23 SECTION IX APPENDIX Page Number. MMC Warranty Statement 21,22 Guideline for Tape repair Page 20...
- Page 24 MMC. The liability of the seller under this warranty is limited, at seller’s option, solely to repair or replace with equivalent equipment.
- Page 25 OXYGEN SENSOR GAUGING TAPE WARRANTY ADDENDUM Warranty for MMC Oxygen Level Sensor Tapes is One (1) year from the ship date of shipment Against defects in material or workmanship, excluding the oxygen cell assembly. Warranty for Oxygen cell Assembly is six (6) months from the date of shipment.
- Page 26 SECTION X LIST OF DRAWINGS DRAWING NO. DESCRIPTION A-2615-17 Oxygen Sensor Cell Outline Drawing B-2615-14 Tape Reel Hub Electronics Module Assembly S-2615-OCX “Flexi-Dip” Portable Tape Assembly, Oxygen Sensor, Closed Gauging DB-2615-1FRX “Flexi-Dip” Portable Tape Assembly, Oxygen Sensor, Restricted Gauging Page 23...
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