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CCR Pod NEREO Manual

Welcome to the short manual for the CCR Pod NEREO.

Sive View

This device enables a wireless connection to a rebreather and a SYMBIOS Dive Computer. It can connect to up to 3 O2 sensors. Those O2 sensors may be either galvanic O2 sensors with a nominal output voltage of 8-15mV @ 0.21 bar pO2 or a GREENFLASH po2 sensor in analog mode.

Specifications

  • Battery: CR123
  • Size: 90 mm length, 40 mm diameter
  • Weight: ~110 g
  • Frequency: 125kHz
  • transmission range: up to 90cm
  • transmission method: magnetic
  • transmission interval: once per second

Power Management

The Device is powered by a CR123 Li Ion Battery. This enable operation for up to 200 diving hours and up to more than 1 year in standby. - the device starts transmitting mV data, as soon as it detects a signal change on sensor 1 or sensor 2. - the device enters sleep mode, when the pO2 in front of the sensors is stable for more than 15 minutes (the sensor signal has to be within +-1mV). - if you are using a GFREENFLASH sensor, connect it to the input for sensor 3, as the GREENFLASH sensor might prevent the device from entering sleep mode.

Connecting sensors

Up to 3 pO2 sensors with analog output can be connected to the device. If you use a GREENFLASH pO2 sensor, connect it to the input for sensor 3.

Front View

Crosss Section

Installing Sensors

Remove the screws

Remove screws

Insert sensors

Insert sensors

Check and lubricate O-ring

O-Ring

Close the device

Close

Battery Exchange

The device uses a CR123 battery. - Open the lid with a coin - Exchange the battery - Check and lubricate the O-ring with silicon grease - Close the lid

Battery

Preparation

  • Read the manual of the dive computer and get familiar with its operation.
  • Switch the dive computer to CCR mode:
    ➔menu➔SETTINGS➔DIVE MODE➔CCR MODE
  • Activate the device by changing the pO2 in front of sensor 1 or 2.
  • Pair the device:
    ➔menu➔SETTINGS➔PAIRING➔CCR INTERFACE
  • Set the correct fraction of the calibration gas:
    ➔menu➔SETTINGS➔CCR SETTINGS➔FO2 CAL GAS
  • Flush the sensors with calibration gas.
  • Enter the calibration menu: ➔menu➔SETTINGS➔CCR SETTINGS➔CALIBRATE CCR
  • Confirm the mV readings by a long press of button 2.

A calibration is accepted when the output of the sensors is between 38 and 80mV @1bar pO2. If you use less than 3 sensors, disable the sensor that are not used: ➔menu➔SETTINGS➔CCR SETTINGS➔PO2 SENSORS

Only enabled sensors are used for pO2 warnings, decompression and CNS calculation.

Diving

The average of the enabled pO2 sensors is used to calculate tissue on/off gassing, decompression schedule and TTS forecast and CNS%. TTS and deco stop forecast is based on the current loop pO2. The claculated loop pO2 is the average of all enabled sensors, as long as the sensors are within 20% of the average. Otherwise, the lowest pO2 value is used for decompression and the highest for CNS% calculation.

Warnings

Warning pop ups and vibration alarms inform the diver about dangerous sitations, like too high or too low pO2. Warnings can be confirmed by pressing both buttons long.

Bailout mode

By pressing the 2nd button long, one can toggle between CCR mode and Open Circuit bailout mode. In Open Circuit bailout mode, the first activated gas is the currently selected diluent gas.

Toubleshooting

Pairing not possible

  • activate the wireless screen (setting ALL) to see if the transmitter is sending data
  • enable the transmitter by changing the pO2 at the sensor (at least 10s)
  • check the battery voltage / replace battery

Calibration failed

  • check the sensors
  • disable sensor channels that are not used
  • check the setting of the fraction of the calibration gas