Vacuum System; Leakage Alarm - Hugyfot HFN-D7200 User Manual

2. Vacuum system

As soon as the system is activated, the HugyCheck system will beep twice and
will turn to 'stand-by' mode. The red LED below the camera support will blink
once every 5 seconds. To start the vacuum procedure, please make sure that
the system is in 'stand-by' mode. Start the vacuum procedure at least 30 min
prior to the dive.
- Make sure that the one-way valve is fitted with the appropriate O-ring and that
this O-ring is clean, slightly greased and free of dirt or cracks.
- Fit the one-way valve to the bulkhead on the back of the housing (1).
- Remove the sealing cap (2) from the one-way valve.
(3)
- Put the vacuum pump onto the one-way valve and start pumping.
- As soon as the HugyCheck system detects a pressure between
950hPa and 850hPa, the red LED will blink once each second.
- When the HugyCheck system detects a pressure between 850hPa and
750hPa, the red LED will blink 3 times each second.
- When a pressure of 750hPa (or less) is registered the red LED will stop
blinking and the green LED will take over (4).
Stop pumping as soon as the green LED is activated!
If the housing hasn't been closed properly or if an O-ring is faulty, the pressure
of 750hPa will not be reached or will not be kept. In this case a loss of vacuum
will be registered by the system and the red LED will be reactivated while the
green LED will stop blinking.
When opening the housing after a dive, the vacuum has to be released by
unscrewing the one way valve from the bulkhead.
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Hugyfot
User Manual HFN-D7200
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3. Leakage alarm

The mini-HugyCheck circuit board is equipped with a leakage alarm which is
triggered by a humidity sensor (located at the bottom of the housing). In some
cases of extremely high air humidity, it may be necessary to decrease the sen-
sitivity of the humidity sensor or to completely deactivate the leakage alarm.
To decrease the sensitivity or deactivate the humidity sensor, the protective
cover of the circuit board is to be removed by loosening a black plastic bolt (5).
A potentiometer in the center of the circuit board controls the humidity sensor.
When turned fully to the left, the leakage alarm is deactivated and 2 beeps will
sound. When turned to the right, the leakage alarm is activated and 1 beep will
sound. The more the potentiometer is turned to the right, the more sensitive
the humidity sensor will be.
Turn fully left
to switch off
leakage alarm.
5
Turn right to activate
leakage alarm and to
increase sensitivity
of humidity sensor.
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