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Related Manuals for U.S. Divers 2 Plus
Summary of Contents for U.S. Divers 2 Plus
- Page 1 Owner's Manual...
- Page 2 Copyright Notice This owner's manual is copyrighted, all rights reserved. It may not, in whole or in part, be copied, photocopied, reproduced, translated, or reduced to any electron medium or machine readable form without prior consent in writing from U.S. Divers Co., Inc. ©1995 U.S.
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Page 3: Safety Considerations
Pay special attention to warnings and cautions, which are denoted by this symbol: WARNINGS alert you to any procedure or situation that may result in serious injury or death. CAUTIONS alert you to any situation or technique that will result in damage to the product. Safety Considerations You must carefully read this entire manual before using your Monitor 3 Air. -
Page 4: Guidelines For Using The Monitor 3 Air
The Monitor 3 Air is a technically advanced tool based on a biophysical model of decompression theory. However, neither it nor any other diving computer (or table) can actually monitor the physical changes that occur in your body as you dive. Each diver varies in his or her susceptibil- ity to decompression sickness, and that susceptibility may vary from day to day. - Page 5 The Monitor 3 Air is designed for dives made with compressed air only. Do not use the Monitor 3 Air for dives made with nitrox or other mixed gases. All divers using dive computers to plan dives and indicate or determine no-decompression/decompres- sion status must use their own computer.
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Page 6: Table Of Contents
Table of Contents Safety Considerations ... i Guidelines for Using the Monitor 3 Air ... ii Introduction What is a “Dive Computer” ... 2 Definition of Compartments ... 2 Multi-Level Diving ... 2 Diving Responsibly ... 3 Features of the Monitor 3 Air ... 4 The Computer Screen ... - Page 7 Diving at Altitude ... 29 Altitude sectors ... 29 Exceeding the Altitude Limit ... 30 Summary of Attention Messages and Alarms ... 31 Attention Messages ... 31 Alarms ... 33 Memory Mode Overview ... 36 Downloading the Memory to a PC ... 36 Activation ...
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Page 9: Introduction
Introduction Congratulations on the purchase of your Monitor 3 Air dive computer. Our designers have condensed important dive planning information into a user-friendly dive instrument. By combining graphics with bold alphanumerics, we have created an easy-to-use computer that provides dive data at a glance. -
Page 10: Diving Responsibly
Multilevel diving is where the Monitor 3 Air excels. By continuously calculating the nitrogen absorption/release of all the compartments, the computer updates the amount of no-decompression time (NDT) you have left. As you ascend to shallower depths, the computer credits you with more allowable NDT;... -
Page 11: Features Of The Monitor 3 Air
Features of the Monitor 3 Air The Monitor 3 Air is made up of two compact units: the computer/display unit which is usually worn on the wrist, and the high pressure (HP) transmitter which is screwed into the regulator first-stage HP port. THE COMPUTER SCREEN The Monitor 3 Air has a large liquid crystal display (LCD) and features large numbers and graphics. - Page 12 Introduction Monitor 3 Air display zones and contact letter designations...
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Page 13: The Transmitter
THE TRANSMITTER The compact transmitter module screws into a standard " HP port. The transmitter automatically activates when it senses pressure from the cylinder. Once activated, it sends pressure information via a low frequency radio wave to the wrist unit. One of the unique features of the transmitter is that it sends along a special code each time it transmits pressure information. -
Page 14: In This Section
In this section: Attaching the Transmitter to the Regulator Pairing the Wrist Unit with the Transmitter Using the Monitor 3 Air Without the Transmitter Checking battery power... -
Page 15: Section 1: Preparation
Section 1: Preparation Attaching the Transmitter to Your Regulator Upon purchasing the Monitor 3 Air have your Authorized U.S. Divers Dealer attach the transmitter to your first-stage regulator. If this is not possible, follow the simple steps listed below to do it yourself: If your regulator is attached to a charged STEP 1 SCUBA cylinder, turn the valve handle to the... -
Page 16: Pairing The Wrist Unit To The Transmitter
CAUTION: DO NOT use the transmitter as a carrying handle. Doing so may damage the transmitter requiring its replacement. If the first-stage is attached to a cylinder, make sure to secure the cylinder so it doesn’t fall over and damage the transmitter (or regulator). - Page 17 Section 1: Preparation Place the Monitor 3 Air wrist unit directly against STEP 3 the transmitter. Turn on the cylinder valve. Within six seconds the message “PAIr” will appear flashing in the upper tank pressure display. Touch contacts A and D as soon as “PAIr” appears STEP 4 (within 5 seconds).
- Page 18 The first cylinder pressure reading will be STEP 5 displayed within 15 seconds. Section 1: Preparation If the procedure is not successful, a FAIL message will appear. If this happens, close the cylinder valve, purge all air from the regulator and repeat the procedure.
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Page 19: Using The Monitor 3 Air Without The Transmitter
Section 1: Preparation Once paired, the Monitor 3 Air will always display the tank pressure of the cylinder to which the transmitter is connected, whenever it is in range. For best possible reception, it is best to fit the transmitter on the same side of the regulator first-stage where you will wear the wrist unit. - Page 20 In this section: Preparation for the dive Functions during the dive Functions at the surface Summary of Messages and Alarms...
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Page 21: Section 2: Diving With The Monitor 3 Air
Section 2: Diving with the Monitor 3 Air Preparation for the Dive WARNING: If the Monitor 3 Air transmitter is not correctly installed or not paired with the computer, it will not perform properly. If you rely on the computer in this condition to plan your dive, you risk serious injury or death. - Page 22 Check the cylinder pressure reading. The STEP 5 cylinder pressure reading appears about 10 seconds after turning on the valve. Section 2: Diving with the Monitor 3 Air The Monitor 3 Air is now in Ready Mode. The STEP 6 computer switches to Dive Mode after entering the water and submerging below four feet.
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Page 23: Functions During The Dive
Section 2: Diving with the Monitor 3 Air Functions During the Dive Current Depth Current depth is displayed in one-foot increments down to a maximum of 330 feet. When the depth is two feet or less, the depth display is replaced with three dashes. Current depth display at 100 feet Current depth... -
Page 24: Dive Time
Dive Time Dive time, which is displayed in minutes, is the amount of time spent below a depth of 4 feet. While the dive time is running, the colon to the right of the number flashes in one-second intervals. Maximum dive time displayed is 199 minutes. -
Page 25: Ascent Rate
Section 2: Diving with the Monitor 3 Air Ascent Rate The optimal ascent rate varies between 23 and 67 ft/min. depending on the depth. Ascent rate is displayed as a percentage of the allowable ascent rate (rounded to the nearest 10 %). For example, if the allowable ascent rate at the current depth is 67 ft/min, and you ascend at 33 ft/ min, the ascent rate will display 50%. -
Page 26: No-Stop Time
Section 2: Diving with the Monitor 3 Air No-Stop Time No-Stop Time is the amount of time you can stay at the current depth without making required decompression stops. This number is displayed in minutes, with 99 being the highest number displayed. If 99: is displayed, you have 99 minutes or more of no-stop remaining. -
Page 27: Cylinder Pressure
Section 2: Diving with the Monitor 3 Air WARNING: There is an acoustic alarm if no-stop time is less than one minute. In this last minute, the no-stop display shows a flashing 0. In order to prevent a decompression dive, you must ascend immediately. -
Page 28: Graphic Air Time Remaining
Graphic Air Time Remaining (ATR) The graphic air time remaining box gives you, at a quick glance, the amount of air you have left. As your air time lowers, the box empties. For example, if the box is filled up to the 45 minute level, you have between 45 and 60 minutes of air time remaining;... -
Page 29: High Air Consumption Warning
Section 2: Diving with the Monitor 3 Air WARNING: Never allow the ATR to go below three minutes. If the ATR goes below three minutes there is a danger of insufficient air supply for the ascent as well as an increased risk of decompression sickness and serious injury or death may result. -
Page 30: Decompression Stop Information
Decompression Stop Information If you exceed the no-stop limits, the Monitor 3 will replace the no-stop time with the deepest (first) decom- pression stop depth (in feet) along with the amount of decompression time (in minutes) at that depth. When a decompression stop has been completed, the next shallower decompression stop is displayed, along with its required stop time. -
Page 31: Total Ascent Time
Section 2: Diving with the Monitor 3 Air Total Ascent Time Total Ascent Time is the addition of all the decompression stop times plus the amount of time it takes to ascend from the current depth to the first decompression stop. SOS Mode If you ignore your decompression stop and return to the surface (shallower than 4 feet) for more than three... -
Page 32: Functions At The Surface
Functions at the Surface Upon surfacing After reaching the surface, the Monitor 3 automatically switches into wait-mode for five minutes. This is the amount of time necessary to recognize the end of the dive. The five minute delay allows you to come to the surface to orient yourself, then resume the dive. -
Page 33: Wait-To-Fly Time
Section 2: Diving with the Monitor 3 Air Wait-to-fly Time Wait-to-fly time is the minimum amount of time you should wait before flying in a commercial airliner. Wait-to- fly time is displayed in hours and is denoted by the no-fly symbol immediately above it. -
Page 34: Desaturation Time
Desaturation Time Desaturation time is the amount of time it takes to completely off-gas any residual nitrogen in your system. Desaturation time is displayed in hours and minutes. Section 2: Diving with the Monitor 3 Air Surface Interval Time Surface interval time is shown immediately after accessing Memory Mode. -
Page 35: Microbubble Warning
Section 2: Diving with the Monitor 3 Air Microbubble Warning Repetitive diving may cause microbubbles to accumulate in the lungs if the surface interval between dives is not long enough. Ignoring decompression stops or an excessive ascent rate can also lead to bubble formation. In order to reduce the risk of decompression sickness for future repetitive dives, the surface interval should be planned long enough to reduce the risk of decompression... -
Page 36: Diving At Altitude
Diving at Altitude The Monitor 3 Air measures the atmospheric pressure even while in Sleep Mode. If the computer detects a higher altitude, it automatically switches on and displays the adaptation time. This is the time after which your body is considered desaturated and stable at the given altitude. -
Page 37: Exceeding The Altitude Limit
Section 2: Diving with the Monitor 3 Air Even the smallest differences in the pressure sensors can cause two computers at the same altitude to display different altitude sectors. (Notice how the altitude sectors overlap in the illustration.) These differences are not meaningful and do not interfere with the operation of the computer. -
Page 38: Summary Of Attention Messages And Alarms
Summary of Attention Messages and Alarms The Monitor 3 Air draws your attention to certain situa- tions and warns you of unsafe diving practices. Attention messages and alarms are always visual and acoustical while underwater; they are only optical at the surface except for the decompression alarm. - Page 39 Section 2: Diving with the Monitor 3 Air Lost transmission If the computer does not receive data from the trans- mitter, the antenna symbol is displayed, accompanied by two beeps. If this occurs frequently, check the position of the transmitter or com- puter.
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Page 40: Alarms
Alarms Alarms are communicated to you by symbols, letters, or flashing icons. In addition, an acoustic warning sounds during the duration of the alarm. An alarm occurs in the following situations. Fast ascent Reduce your ascent rate (see page 18 for more details on ascent rate) Section 2: Diving with the Monitor 3 Air Air Time Remaining = 0... - Page 41 Section 2: Diving with the Monitor 3 Air Low computer battery While diving, "bAt' alternates with the maximum depth display. During Surface Mode or Ready Mode, "bAt" flashes in the maximum depth position. This indicates battery charge is nearing 0%. Low transmitter battery While diving, the "bAt"...
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Page 42: In This Section
In this section: Activating Memory Mode Scrolling through logged dives... -
Page 43: Section 3: Memory Mode
Section 3: Memory Mode Overview The Monitor 3 Air wrist unit is able to display the details of the last 19 dives. Any dive that lasts two minutes or longer is entered into memory. After the memory is filled with all 19 dives, the oldest dive is deleted for each new dive entered. - Page 44 Section 3: Memory Mode...
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Page 45: Activation
Section 3: Memory Mode Activation From Ready Mode o r Surface Mode , touch STEP 1 contacts A & C. The computer will emit one beep and the Memory Mode icon will appear in the mode zone. If activating from Surface Mode, the current surface interval also appears. -
Page 46: Scrolling Through Logged Dives
Scrolling through Logged Dives To scroll back through the memory (towards the oldest dive), touch contacts A & C. To scroll forward through the memory (towards the most recent dive), touch contacts A & B. Exiting Memory Mode Scroll back through To exit Memory Mode, touch contacts A&D. - Page 47 Section 3: Memory Mode...
- Page 48 In this section: Activation from Ready Mode Activation from Surface Mode Planning a Decompression Dive...
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Page 49: Section 4: Pre-Dive Planning Mode
Section 4: Pre-Dive Planning Mode Overview The Monitor 3 Air has a built-in dive planner that allows you to plan both no-stop dives and decompression dives. The planner takes into account the temperature of the most recent dive and altitude. WARNING: Planned decompression dives violate the responsible diving practice standards of every major diving organization. - Page 50 Touch contacts A & D to confirm the selection. STEP 2 The word RUN will flash for about five seconds and then start scrolling through the available time-depth combinations. Section 4: Pre-Dive Planning Mode The Monitor scrolls from 50 to 200 feet in 10-foot STEP 3 increments.
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Page 51: Activation From Surface Mode
Section 4: Pre-Dive Planning Mode Activation from Surface Mode From Surface Mode , touch contacts A & B. The STEP 1 computer will emit one beep and the Dive Plan Icon will appear in the mode zone. STEP 2 Surface Mode Touch contacts A &... - Page 52 If you do not want to add any additional surface STEP 3 time, go to step 4. If you do want to add surface time, touch contacts A & C. If you add too much surface time and want to decrease it, touch contacts A &...
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Page 53: Planning A Decompression Dive
Section 4: Pre-Dive Planning Mode Planning a Decompression Dive Before planning a decompression dive, reread the import warning at the beginning of this section. When the Monitor 3 Air scrolls to the desired STEP 1 depth, touch contacts A & D. The word “Add” appears in the depth zone, the flashing dive time is now one minute more than the allowable no- stop time, and all decompression information is... - Page 54 When you reach the desired dive time, release STEP 3 the contacts and, after a few moments, the Monitor 3 Air will display the new decompres- sion information. You can then, as shown in step 2, increase and decrease the dive time as you wish.
- Page 55 Section 4: Pre-Dive Planning Mode...
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Page 57: Section 5: Care & Maintenance
Section 5: Care & Maintenance Overview The Monitor 3 Air is a robust instrument designed to withstand the rigors of SCUBA diving. However, you still need to protect it from shock, extreme heat, chemical attack, and tampering. Even though the Monitor 3 Air’s material is tough and durable, it is susceptible to chemical attack and scratches. -
Page 58: Care After The Dive
Care After the Dive CAUTION: If the Monitor 3 Air transmitter is not attached to a first-stage regulator while soaking (explained below), make sure that water is not allowed to enter the high pressure inlet. Water entering the transmitter may cause damage to the internal components. -
Page 59: Operating Temperature
Section 5: Care & Maintenance Operating Temperature The Monitor 3 Air operates normally between 12 (-10 C to 50 C). You may notice the liquid crystal display (LCD) becoming sluggish at extremely low temperatures. This is normal and will not affect the computer’s accuracy. It is possible to damage the electronics if left exposed to direct sunlight or in a hot, confined space (like a car trunk). -
Page 61: Section 6: Reference
Section 6: Reference Technical Specifications Operational Performance Depth Range: ....0-330 feet Time Measurement: ..0-199 min.; Quartz timing Air Pressure Range: . -
Page 62: Zh-L8 Adt Algorithm
ZH-L8 ADT Calculation Model The Monitor 3 Air uses a new calculation model known as the ZH-L8 ADT. This model uses eight compartments or "tissue" groups with half-times ranging from 5 to 640 minutes. This calculation model is based on the most current research conducted by the late Dr. - Page 63 Section 6: Reference time will also assist those local areas of impaired circulation to desaturate with less risk of decompression sickness. The calculation of microbubbles results in altered ascent instructions. If microbubbles are assumed to be present based on the data used by the Monitor 3 Air, the ascent rate is reduced to 23 feet/minute.
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