1. Cochran Consulting, Inc.
Lifeguard® Recorder Tutorial 19 October 2015
(“Analyst” and “Lifeguard” are registered Trademarks of Cochran Consulting, Inc.)
Cochran Consulting, Inc.
Recorder Introduction
Dive Parameters Profiled
Dive Sampling Rates
Interdive Profiling
Recording Capacity
User Settable Options
PO2 Calibration
More
© 2015 Cochran Consulting, Inc.

2. Lifeguard® Recorder Tutorial Recorder Introduction
The Cochran Lifeguard Recorder is a powerful, feature-rich, seamless combination of a Dive Data Recorder and a Flight Data Recorder in an amazingly small module. It is a stand-alone “Black Box” functionally similar to an aircrafts Black Box. It is fully autonomous with no task loading and even turns itself on and off automatically. Massive, detailed data and profiles are recovered via a USB connection.
There are nine models (R0 to R8) with various configurations of sensors from no high pressure sensors up to two high pressure sensors with up to three PO2 sensors. The Recorder Module stores massive amounts of profile data to a very high precision. 8,192 dives with over 10,000 dive-hours are stored. The Data Recording Rate is user selectable to an astonishing 1.00 seconds, 0.50 seconds, or 0.25 seconds.
It is powered by two redundant, user replaceable batteries that provide over two years of reliable operation. There are no rechargeable batteries to wear out, and no battery chargers to lose. Working in the background, the Recorder silently, unobtrusively, provides automatic, hands-free, detailed recording of your dive data. There are no buttons, switches, controls, or tapping.
Stored data and profiles are retrieved with the Cochran USB Module and the Version 5 Cochran PC Analyst software.
© 2015 Cochran Consulting, Inc.

3. Lifeguard® Recorder Tutorial Recorder Module Models
Model R0
No Hp Sensor
No PO2 Sensors
Model R1
One Hp Sensor
No PO2 Sensors
Model R2
Two Hp Sensors
No PO2 Sensors
Model R3
No Hp Sensors
1 to 3 PO2 Sensors
Negative Volt Input
Model R4
One Hp Sensor
1 to 3 PO2 Sensors
Negative Volt Input
Model R8
Two Hp Sensors
1 to 3 PO2 Sensors
Positive Volt Input
Model R5
Two Hp Sensors
1 to 3 PO2 Sensors
Negative Volt Input
Model R6
No Hp Sensors
1 to 3 PO2 Sensors
Positive Volt Input
Model R7
One Hp Sensor
1 to 3 PO2 Sensors
Positive Volt Input
Model R2 Shown for size reference
© 2015 Cochran Consulting, Inc.

4. © 2015 Cochran Consulting, Inc.
Lifeguard® Recorder Tutorial Turning the Recorder On (Awake) and Off (Asleep)
The Lifeguard Recorder can be awakened either automatically or manually. For those Recorders with Cylinder Pressure Transducers, the Module will automatically leave the Asleep Mode and enter the Surface Mode if it senses a Cylinder Pressure of greater than 200 psi. For the Recorders WITHOUT any Cylinder Pressure (the R0, R3, and R6 models) the unit will automatically enter the Surface Mode if it senses any PO2 Sensor reading greater than 0.30 ATA. This can also be accomplished by shorting contacts #1 and #2 for two seconds or more with a metallic object such as coin or knife.
When the Recorder leaves the Asleep Mode it will issue five one-second beeps as all of its many integrity checks are completed. At any time if the contacts are shorted again, the Recorder will continue to beep as long as the contacts remain shorted , so the user can confirm that the Recorder is Awake.
Returning to the Asleep Mode is automatic. For those models with Cylinder Pressure Transducers, the unit will go Asleep when the Cylinder Pressure is less than 200 psi after 30 minutes. For the Recorders WITHOUT any Cylinder Pressure (the R0, R3, and R6 models) the unit will automatically go Asleep if it senses all PO2 Sensor readings are less than 0.30 ATA which may require that the rebreather loop be opened to the atmosphere.
Even though the Recorder is in the extremely low power Asleep Mode, it continues to monitor and log many parameters. This is called “Interdive Profiling”.
© 2015 Cochran Consulting, Inc.

5. Lifeguard® Recorder Tutorial Touch Contacts
To manually turn on the unit, short Contact #1 and Contact #2 with a metal object for two seconds. The unit will issue five beeps as it performs its internal system and sensor checks.
If the unit is already awake, shorting these contacts will cause the unit to beep as long as the contacts remain shorted thereby confirming that the unit is awake.
© 2015 Cochran Consulting, Inc.

6. Lifeguard® Recorder Tutorial Recorder Modes
There are two basic operational modes: the Awake Mode and Asleep Mode. When in the Asleep Mode, the Recorder continues to monitor and record certain parameters such as Altitude and Battery Voltages.
In the basic Awake Mode, there are three Sub-modes: the Surface Mode, the Dive Mode, and the Post-dive Mode (sometimes called the “Post Dive Interval” or the “PDI”). The Recorder automatically switches between these modes based on depth and time. When first turned on the Recorder will enter the Surface Mode and will automatically go Asleep 30 minutes after the Cylinder pressure is removed if a dive is not started.
If Awake, when the Recorder goes below 7fsw it will enter the Dive Mode and begin recording at the user specified timing rate. When the Recorder ascends above 4fsw it will enter the Post Dive Interval mode which lasts for 10 minutes. If a dive is restarted within that interval it will be considered part of the same dive and recorded as such. If the Interval is allowed to expire the Recorder will enter the Surface Mode. When in the Surface Mode, 30 minutes after the Cylinder Pressure drops below 200psi, the Recorder will go into the Asleep Mode.
After diving, to conserve battery power, it is recommended to release the cylinder pressure(s) and open the gas loop so the Recorder will go into the extremely low power Asleep Mode.
© 2015 Cochran Consulting, Inc.

7. Lifeguard® Recorder Tutorial Dive Parameters Profiled
Parameter: Models:
Depth All
Ambient Temperature All
Ascent/Descent Rate All
Cylinder #1 (O2) Pressure R1, R2, R4, R5, R7, R8
Cylinder #1 (O2) Gas Flow R1, R2, R4, R5, R7, R8
Cylinder #1 (O2) Differentiated Gas Flow R1, R2, R4, R5, R7, R8
Cylinder #2 (Dil) Pressure R2, R5, R8
Cylinder #2 (Dil) Gas Flow R2, R5, R8
Cylinder #2 (Dil) Differentiated Gas Flow R2, R5, R8
PO2 Sensor a PO2 R3, R4, R5, R6, R7, R8
PO2 Sensor b PO2 R3, R4, R5, R6, R7, R8
PO2 Sensor c PO2 R3, R4, R5, R6, R7, R8
Port Side Battery Voltage All
Starboard Side Battery Voltage All
Internal Battery Voltage All
Relevant Dive warnings as they occur All
© 2015 Cochran Consulting, Inc.

8. Lifeguard® Recorder Tutorial Some Dive Events Recorded
Depth Sensor Failure Altitude over 16,000 feet
Temperature Sensor Failure Depth greater than Set Point
Cylinder #1 Pressure Sensor Failure Depth greater than 250 meters
Cylinder #1 Pressure greater than 5,200 psi
Cylinder #2 Pressure Sensor Failure Cylinder #2 Pressure greater than 5,200 psi
PO2a less than Low Set Point
PO2a Sensor Failure PO2a greater than High Set Point
PO2b Sensor Failure PO2b less than Low Set Point
PO2c Sensor Failure PO2b greater than High Set Point
PO2c less than Low Set Point
PO2c greater than High Set Point
Notes:
Data shown is for Recorder model R5. Other models may have fewer parameters.
For Diagnostic purposes, many other parameters not shown are also stored.
See Cochran’s “Analyst PC Software” document for more details
© 2015 Cochran Consulting, Inc.

9. Lifeguard® Recorder Tutorial Dive Parameters Standard Specifications
The Lifeguard Recorder Module and the Lifeguard Dive Computer CPU Module are available in two levels of specifications; “Standard” (shown here) and “Extended”. Recreational and Commercial models are optionally available with either. For Military applications only the “Extended” Specification is available.
Parameter: Range: Accuracy: Resolution:
Maximum Operating Depth 600 fsw
Depth 0 to 600 fsw +/- 1% of full scale feet
Max Depth (in air) 10 fsw
Ambient Temperature 0°f to 140°f +/- 2°f 0.5°f
Ascent/Descent Rate 250 fpm +/- 2 fpm 1 fpm
Cylinder #1 (O2) Pressure 5,200 psi +/- 3% of full Scale psi
Cylinder #1 (O2) Gas Flows(2) 0 to 250 lpm +/ lpm lpm
Cylinder #2 (Dil) Pressure 5,200 psi +/- 3% of full Scale psi
Cylinder #2 (Dil) Gas Flows(2) 0 to 250 lpm +/ lpm lpm
PO2 Sensors a, b, and c 0 to ATA Note ATA
Port Side Battery Voltage 0 to 4.00 Volts +/ volts volts
Starboard Side Battery Voltage 0 to 4.00 Volts +/ volts volts
Internal Battery Voltage 0 to 4.00 Volts +/ volts volts
Note 1: PO2 Sensors are calibrated in the field by the user.
© 2015 Cochran Consulting, Inc.

10. Lifeguard® Recorder Tutorial Extended Dive Parameters Specifications
The Lifeguard Recorder Module and the Lifeguard Dive Computer CPU Module are available in two levels of specifications; “Standard” and “Extended” (shown here). Recreational and Commercial models are optionally available with either. For Military applications only the “Extended” Specification is available.
Parameter: Range: Accuracy: Resolution:
Maximum Operating Depth 820 fsw
Depth (in water) < 200 fsw +/- 2 fsw feet
Depth (in water) to 400 fsw +/- 3 fsw feet
Depth (in water) > 400 fsw +/- 4 fsw feet
Max Depth (in air) 60 fsw
Ambient Temperature 0°f to 140°f +/- 2°f 0.5°f
Ascent/Descent Rate 250 fpm +/- 2 fpm 1 fpm
Cylinder #1 (O2) Pressure 6,000 psi +/- 3% of full Scale psi
Cylinder #1 (O2) Gas Flows(2) 0 to 250 lpm +/ lpm lpm
Cylinder #2 (Dil) Pressure 6,000 psi +/- 3% of full Scale psi
Cylinder #2 (Dil) Gas Flows(2) 0 to 250 lpm +/ lpm lpm
PO2 Sensors a, b, and c 0 to ATA Note ATA
Port Side Battery Voltage 0 to 4.00 Volts +/ volts volts
Starboard Side Battery Voltage 0 to 4.00 Volts +/ volts volts
Internal Battery Voltage 0 to 4.00 Volts +/ volts volts
Note 1: PO2 Sensors are calibrated in the field by the user
© 2015 Cochran Consulting, Inc.

11. Lifeguard® Recorder Tutorial Interdive Profiling
As with all of Cochran’s Dive Computers, the Lifeguard Recorder automatically logs certain data even when the unit is “Asleep”. Periodically, it measures a number of parameters to see if any have changed. If something has changed, relevant parameters are logged. Cochran refers to this activity as “Interdive Profiling” and is similar to a Flight Data Recorder. The parameters measured for this purpose are:
Universal Coordinated Time (GMT)
Barometric Altitude
Ambient Temperature
Port Battery Voltage
Starboard Battery Voltage
Internal Battery Voltage
Relevant Sensors Integrity
This information is shown to the user via the Lifeguard Analyst Version 5.0.
In case of a diver incident, the Recorder should be kept with the diver so that it can continue to log altitudes and temperatures to which the diver is exposed during transport. Analyses of the altitudes to which a diver is exposed can be very important.
© 2015 Cochran Consulting, Inc.

12. Lifeguard® Recorder Tutorial Recording Capacity
Number of Dives 8,192
User specified Dive sampling rates: 1, 2, or 4 samples per second
Total Dive Hours of recording capacity (at one second sampling)
Product R0 30,000
Product R1 19,000
Product R2 12,000
Product R3 10,000
Product R4 12,000
Product R5 10,000
Product R6 12,000
Product R7 10,000
Product R8 10,000
Interdive Profiling 100,000 samples (Maximum) per dive
Dive Beginning Snapshots 8,192 Over 30 parameters per Dive
Dive Ending Snapshots 8,192 Over 50 parameters per Dive
Data including high resolution dive profiles can be exported in the .csv format via Analyst Version 5.0 software.
© 2015 Cochran Consulting, Inc.

13. Lifeguard® Recorder Tutorial Dive Beginning Summary Snapshot
Universal Coordinated Time (GMT) Current Depth
Current Barometric Altitude Current Ascent/Descent Rate
Surface Time (Since turned on or since last dive)
Current Warnings User PO2 Sensor Calibration Information
Ambient Temperature Port Battery Voltage
Starboard Battery Voltage Internal Battery Voltage
Cylinder #1 Pressure Cylinder #2 Pressure
Cylinder #1 Gas Flow Cylinder #2 Gas Flow
Cylinder #1 Differentiated Gas Flow Cylinder #2 Differentiated Gas Flow
PO2a Reading
PO2b Reading
PO2c Reading
Notes:
Data shown is for Recorder model R5. Other models may have fewer parameters.
For Diagnostic purposes, many other parameters not shown are stored.
See Cochran’s “Analyst® PC Software” document for more details
© 2015 Cochran Consulting, Inc.

14. Lifeguard® Recorder Tutorial Dive Ending Summary Snapshot
Universal Coordinated Time (GMT) Maximum Depth
Average Depth Bottom Time
Total Dive Events Recorded Ascent Rate Analyses
Ambient Temperature Port Battery Voltage
Starboard Battery Voltage Internal Battery Voltage
Cylinder #1 Pressure Cylinder #2 Pressure
Cylinder #1 Gas Flow Cylinder #2 Gas Flow
Cylinder #1 Differentiated Gas Flow Cylinder #2 Differentiated Gas Flow
Cylinder #1 Average Gas Flow Cylinder #2 Average Gas Flow
PO2a Reading
PO2b Reading
PO2c Reading
Dive Warnings
Notes:
Data shown is for Recorder model R5. Other models may have fewer parameters.
For Diagnostic purposes, many other parameters not shown are also stored.
See Cochran’s “Analyst® PC Software” document for more details
© 2015 Cochran Consulting, Inc.

15. Lifeguard® Recorder Tutorial General User Settable Options
UCT Time Set from PC Clock
Sampling Rate second, ½ second, or ¼ second
Gas Flow SAC/DAC (Surface Air Consumption or Depth Air Consumption)
Gas Flow psim/lpm (psi per minute or liters per minute)
Cylinder #1 Size Liters of Water Capacity (determines Gas Flow and Workload)
Cylinder #2 Size Liters of Water Capacity (determines Gas Flow and Workload)
Post Dive Surface Interval Minutes after surfacing from a dive to actually ending the dive
Command to restore current unit configuration to original as-shipped configuration
Notes:
Data shown is for Recorder model R5. Other models may have fewer parameters.
For Diagnostic purposes, many other parameters not shown are also stored.
See Cochran’s “Analyst® PC Software” document for more details
© 2015 Cochran Consulting, Inc.

16. Lifeguard® Recorder Tutorial PO2 Related User Settable Options
Select active PO2a Sensor (Enabled or Disabled):
Select active PO2b Sensor (Enabled or Disabled):
Select active PO2c Sensor (Enabled or Disabled):
Select PO2 Sensor Connections (Direct or Buffered):
Select Auto Altitude Compensation of PO2 Cal (On or Off):
Enter PO2 Cell Standard 0.21 ata (10 to 25): [In millivolts]
Select Number of PO2 Cal Points (One or Two):
Enter Lower PO2 Cal Point in O2% (18.0 to 30.0): [Only shows if two point Calibration]
Enter Higher PO2 Cal Point in O2% (20.0 to 99.9): [Only shows if two point Calibration]
Enter Single Point PO2 Cal Point in O2% (18.0 to 99.9): [Only shows if one point Calibration]
Notes:
Data shown is for Recorder model R5. Other models may have fewer parameters.
For Diagnostic purposes, many other parameters not shown are also stored.
See Cochran’s “Analyst® PC Software” document for more details
© 2015 Cochran Consulting, Inc.

17. Lifeguard® Recorder Tutorial PO2 Sensor System
Lifeguard Recorder models R3 thru R8 have a sophisticated PO2 system that can manage up to three external PO2 sensors. The cable attached to the Lifeguard CPU has a four pin waterproof connector on the end. A mating connector and cable can be supplied to attach to a specific Breathing Apparatus. If the Breathing Apparatus already has PO2 sensors, the Lifeguard Recorder can be connected to use those sensors, or it can be connected to independent PO2 sensors. The system is compatible with PO2 sensors like the R22D with a 10 millivolt output or the PSR with a 25 millivolt output.
The unique high resolution analog and digital subsystem that reads the PO2 sensors is highly accurate and stable and is individually calibrated at the factory to a high precision. Furthermore, changes in Battery voltages do not affect the PO2 measurements or calibration.
Some PO2 sensors require periodic calibration in the field. To make this easy and simple, it is recommended to use the Cochran Analyst 5 PC Software. Analyst also allows the user to select Automatic Altitude Compensation and one or two point calibration method, among others.
The Lifeguard Recorder is available to accommodate either positive or negative PO2 Sensor voltage.
Contact Cochran to discuss your specific requirements.
© 2015 Cochran Consulting, Inc.

18. Lifeguard® Recorder Tutorial PO2 Calibration (page 1 of 2)
The Lifeguard PO2 Calibration is simple and fast. After connecting the Lifeguard to the Analyst USB cable and establishing the connection, the operator selects PO2 Calibration on the Analyst screen. Analyst then queries the Lifeguard once per second and displays the following information (updated once per second):
Current PO2a Sensor Voltage Reading (No Entry): millivolts
Current PO2b Sensor Voltage Reading (No Entry): millivolts
Current PO2c Sensor Voltage Reading (No Entry): millivolts
Current PO2a Sensor PO2 Reading (No Entry): ata
Current PO2b Sensor PO2 Reading (No Entry): ata
Current PO2c Sensor PO2 Reading (No Entry): ata
For the Single Point Calibration method, the user first enters the “Single Point PO2 Cal Point in O2%”, for example: “92.3”. If this is already the correct percentage there is no need to re-enter it. Next, the user exposes the PO2 sensors to the Oxygen source and observes the Analyst screen until the readings are reasonably close and stable. Clicking on the “CAL” button will automatically perform the calibration.
© 2015 Cochran Consulting, Inc.

19. Lifeguard® Recorder Tutorial PO2 Calibration (page 2 of 2)
For the Two Point Calibration method, the user first enters the “Lower Point PO2 Cal Point in O2%”, for example: “21.0”. If this is already the correct percentage there is no need to re-enter it.
Next, the user exposes the PO2 sensors to this LOWER Percentage Oxygen source and observes the Analyst screen until the readings are reasonably close and stable. Clicking on the “PRE-CAL” button will lock in the first parameters for the calibration.
Next, the user enters the “Higher Point PO2 Cal Point in O2%”, for example: “91.5”. If this is already the correct percentage there is no need to re-enter it.
Next, the user exposes the PO2 sensors to this HIGHER Percentage Oxygen source and observes the Analyst screen until the readings are reasonably close and stable. Clicking on the “CAL” button will automatically perform the calibration. Continue to monitor the Analyst screen for PO2 stability and completion status.
Note:
For either Calibration Method, Calibration is instantaneous but the user should briefly continue to monitor the Analyst screen for PO2 stability and completion status. Each set of Calibration Parameters is stored in the Recorder as an Interdive Event.
© 2015 Cochran Consulting, Inc.

20. Lifeguard® Recorder Tutorial General User Settable Alarms
Enable/disable Audible Beeper when turning on
Enable/disable Audible Beeper for Alarms
Enter High PO2 Alarm (0.50 to 1.59)
Enter Low PO2 Alarm (0.00 to 1.00)
Enter Depth Alarm Depth (0 to 475 Ft)
Enter Fixed Ascent Rate Alarm Limit (0 to 120 fpm)
Enter #1 Cylinder Low Pressure Alarm (0 to 1500 psi)
Enter #1 Cylinder Gas Flow High Alarm (0.0 to 15.0 lpm)
Enter #1 Cylinder Gas Flow Low Alarm (0.0 to 15.0 lpm)
Enter #2 Cylinder Low Pressure Alarm (0 to 1500 psi)
Enter #2 Cylinder Gas Flow High Alarm (0.0 to 15.0 lpm)
Enter #2 Cylinder Gas Flow Low Alarm (0.0 to 15.0 lpm)
© 2015 Cochran Consulting, Inc.

21. Lifeguard® Recorder Tutorial PO2 Sensors Connections
Recorder models with a PO2 sensor cable allow up to three PO2 sensors to be connected. The cable attached to the Recorder has a four pin waterproof connector on the end. A mating connector and cable can be supplied to attach to a specific Breathing Apparatus. If the Breathing Apparatus already has PO2 sensors, the Recorder can be connected to use those sensors, or the Recorder can be connected to independent PO2 sensors.
A “T” is available that contains a single PO2 Sensor. The “T” can be inserted in the inhalation hose of a rebreather. See the PowerPoint “LifeguardPO2SensorsTee”
Contact Cochran to discuss your specific requirements.
© 2015 Cochran Consulting, Inc.

22. Lifeguard® Recorder Tutorial Gas Flow © 2015 Cochran Consulting, Inc.
Gas Flows are computed any time the unit is ‘Awake’ by monitoring the change in cylinder pressure to a very high degree of precision. The sampling rate of this monitoring is based on the user setting of the data profiling rate of: 1.00, 0.50, or 0.25 seconds. There are two simultaneous computations for gas flow, one based on a 60 second running average and the other based on a 10 second running average. These times are not related to the sampling rate in that if a 0.25 second sampling rate was selected, there are actually 240 samples for the 60 second computation and 40 samples for the 10 second computations
Changes in the temperature of a cylinder can affect actual pressure within the cylinder. For that reason, the High Pressure Sensor also measures the cylinder temperature. This allows the Lifeguard Recorder to compensate for any changes in cylinder temperature.
The Gas Flow computations are based on the user selection of:
DAC (Depth Air Consumption) or
SAC (Surface Air Consumption).
Gas Flow is also based on the user selection of:
psim (PSI per minute) or
lpm (liters per minute).
User selections are put into the Recorder via the Lifeguard Analyst PC Software.
© 2015 Cochran Consulting, Inc.

23. Lifeguard® Recorder Tutorial Gas Flows © 2015 Cochran Consulting, Inc.
DAC (Depth Air Consumption) is the actual gas consumption regardless of depth. DAC measurement can be either psim (PSI per minute) or lpm (liters per minute). If a certain amount of gas is being consumed while at the surface, diving to one atmosphere (33 fsw) will double the measurement because twice as much gas is being consumed. Typically, this is used when the actual gas used is to be profiled.
SAC (Surface Air Consumption) is the actual gas consumption referred to the surface. Basically, SAC is DAC with depth removed from the computation. SAC measurement can be either psim (PSI per minute) or lpm (liters per minute). If a certain amount of gas is being consumed while at the surface, diving to one atmosphere (33 fsw) will not change the measurement. Typically, this is used when comparing gas flows between divers.
lpm (liters per minute) is the volume of gas consumed. For the Lifeguard to automatically convert from a decline in cylinder pressure to the volume of gas consumed it is necessary for the system to know the size of the cylinder in liters. This is commonly called “Liters of Water Capacity”. To convert from a cylinder size to liters the following table may be helpful.
Changes in the temperature of a cylinder can affect actual pressure within the cylinder. For that reason, the High Pressure Sensor assembly also measures the cylinder temperature. This allows the Lifeguard Recorder to automatically compensate for any changes in cylinder temperature.
© 2015 Cochran Consulting, Inc.

24. Lifeguard® Recorder Tutorial Cubic Feet to Liters Conversion Table
Aluminum
3000 PSI Working Pressure
13 cu ft = 1.9 liters
19 cu ft = 2.9 liters
30 cu ft = 4.3 liters
40 cu ft = 5.7 liters
50 cu ft = 6.9 liters
63 cu ft = 9 .0 liters
80 cu ft = liters
3300 PSI Working Pressure
80 cu ft = 10.3 liters
100 cu ft = 13.2 liters
4350 PSI Working Pressure
106 cu ft = 11.1 liters
LP Steel (2400 PSI)
77 cu ft = 12.0 liters
85 cu ft = 12.8 liters
95 cu ft = 14.8 liters
108 cu ft = 16.8 liters
HP Steel (3442 PSI)
65 cu ft = 8..2 liters
80 cu ft = 10.1 liters
100 cu ft = 12.2 liters
119 cu ft = 14.8 liters
120 cu ft = 15.3 liters
130 cu ft = 16.0 liters
© 2015 Cochran Consulting, Inc.

25. © 2015 Cochran Consulting, Inc.
Lifeguard® Recorder Tutorial Attaching the High Pressure Sensor(s) to a Breathing Apparatus
For those Lifeguard Models with high-pressure (HP) sensors, they install into a high-pressure port of your first-stage regulator.
Remove the HP plug from your first stage regulator.
Lightly lubricate the sensor O-ring only with a lubricant approved for use with Enriched Air Nitrox equipment. DO NOT USE SILICONE GREASE.
Screw the sensor lightly into the HP port
Using a Scuba Tool, or thin 9/16" open-end wrench, snug the HP sensor connection taking caution to not over tighten.
CAUTION: Tools such as vise-grips or channel lock pliers will damage the sensor.
CAUTION: DO NOT use your hand to tighten the high-pressure connection. This procedure must only be accomplished by using the appropriate tool placed over the metal nut of the high-pressure connection. It must not be over tightened.
CAUTION: DO NOT twist, stress, or otherwise abuse the HP cable.
With the first stage properly attached to a filled SCUBA cylinder, slowly open the cylinder valve. Once the valve has been opened, listen to the HP connection for any escaping gas. If possible, completely immerse the system in water to see if bubbles form around your connection. If any gas leak is seen or heard, immediately turn the gas off by closing the cylinder valve.
Usually, the Lifeguard clips to a low-pressure hose close to the first-stage. When clipping it onto the low-pressure hose, a rolling motion will provide better results rather than pushing it straight down onto the hose.
© 2015 Cochran Consulting, Inc.

26. © 2015 Cochran Consulting, Inc.
Lifeguard® Recorder Tutorial Attaching the High Pressure Sensor(s) to a Breathing Apparatus
The standard length of the HP cable is 13 inches. Other cable lengths can be specified when purchasing the Recorder from Cochran.
If a spare HP port is not available, an HP Port
Extender is available which creates an extra HP port.
It is available with different thread options.
A 360 degree HP swivel is available that can make
installation simpler in difficult situations. It is
particularly useful with the Recorder models R2
and R5 which have two HP sensors.
© 2015 Cochran Consulting, Inc.

27. Lifeguard® Recorder Tutorial Recorder Module Batteries
The Lifeguard Recorder Modules are powered by two user-replaceable, off the shelf, three volt type CR12600SE Lithium batteries. The two batteries are redundant where the electronics system automatically draws power from the battery that has the highest voltage. Should both of these main batteries be depleted, an internal battery takes over and an orderly shutdown is executed. This internal battery has an expected life of over ten years. In normal operation, for the original owner, this internal battery will be replaced free of charge at the factory every ten years.
When replacing the main batteries, it is recommended to replace one, then the other so the Module will always have power. If this procedure is followed and the batteries are not completely depleted, replacing the batteries does not affect any parameters within the unit such as Nitrogen loading. Never replace just one battery. It is recommended that both batteries be replaced.
With fresh Lithium batteries, the shelf-life of the batteries is over ten years. In average use the batteries will last for hundreds of dive hours of diving or two years, whichever occurs first. However, it is recommended to replace the batteries annually.
Never store the Recorder Module with low or depleted or removed batteries.
For maximum reliability and battery life we recommend Lithium batteries. However, Alkaline “N” cells will also work but at reduced life and reliability. When using “N” cells, always replace the two Lithium batteries with four new “N” cells.
The battery voltages can be seen by using the Analyst PC software Version 5.0..
Note: The Lithium battery is non-magnetic and will not affect a compass. Most Alkaline “N” cells are magnetic.
CAUTION: Never use the 12 volt battery that is similar in size to the 1.5 volt “N” cell!
© 2015 Cochran Consulting, Inc.

28. Lifeguard® Recorder Tutorial Replacing Recorder Module Batteries
The Recorder Module main batteries are very easy for the user to replace as there are no chargers, wires, holders, or special tools needed. Each battery has its own watertight compartment that is sealed from the electronics. The compartment is accessed by unscrewing its Cap with a coin (a US Quarter is supplied with the product). Each Cap has two o-rings for watertight redundancy. The contacts in the Battery Caps and Compartments are of a unique metal that resists seawater corrosion. Should a compartment become flooded, immediately and thoroughly flush the compartment and cap with fresh water, let it dry, and replace the battery. Be sure to carefully inspect the Cap for debris before installing it. The Cap is a special material that is softer than the Case material so that the Cap will be expelled should pressure build up within a Compartment.
CAUTION: Observe proper polarity when installing batteries! The positive tip goes in first.
Tighten battery caps until the o-rings cannot be seen.
Never overtighten the caps.
Only use the supplied U.S. Quarter or similar coin. Never use a screwdriver.
© 2015 Cochran Consulting, Inc.

29. Lifeguard® Recorder Tutorial Recorder Module Warranty and Support
For Recreational use, the Cochran Lifeguard Recorder has a two year Limited Warranty. For Commercial and Military use it has a one year Limited Warranty. Download the Warranty details from our Website. All Models include USB interface and Standard Edition of the Analyst PC Software Version 5.0.
We are committed to professional, responsive support for the lifetime of our products. Phone during our office hours in Richardson, Texas or Visit our Website for details.
The Cochran Lifeguard Products can be purchased from Cochran or selected Distributors and Dealers.
© 2015 Cochran Consulting, Inc.

30. Lifeguard® Recorder Tutorial © 2015 Cochran Consulting, Inc.
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