Owner`s manual

Dive Rite

Ch. 3 Pg. 10

Recommended Calibration Sequence:

(1) Connect ALL regulators, leave DILUENT Valve off. On systems equipped with an ADV

and cut-off valve, make sure the valve is in the off position.

(2) Turn on Oxygen and Activate handsets. Make sure that the solenoid fires for several

seconds to flush Oxygen through the solenoid. This is easily accomplished by setting the

set-point to 1.0 then setting it to a 0.4 once the purge is completed.

(3) Evacuate all the gas from the loop, flush with oxygen and repeat at least FOUR times.

This is accomplished by inhaling off the loop and exhaling through the nose. The counter-

lungs should be bottomed out before adding Oxygen. The hose on the exhale side of the

DSV will not be flushed by inhaling only, make sure that you blow Oxygen rich gas

around the loop, once or twice (best performed during the second and third flushes)

before exhaling out the nose. On final flush add Oxygen until OPV vents gas.

(4) Go to the “MV display” screen and take note of the values, exit this screen to prevent the

unit from remaining on.

(5) Let the unit sit for at least FIVE minutes. Top with oxygen if there is any loss of volume

and go to the “MV display” screen again. If the sensor values have decreased, the flush

was incomplete so flush again and repeat until readings are stable.

(6) Once mV readings are stable, vent excess gas until the loop is at ambient pressure (the

BEST way is to force excess gas through the OPV, opening the DSV/BOV risks

contamination).

(7) Record mV readings (any cell under 40mV will be rejected, the minimum mV will be

adjusted for altitude when in altitude calibrate mode)), enter the “Calibrate O2” screen,

select the calibration method and select ready. Any sensor that fails to meet minimum mV

values will be rejected and the user alerted to the specific cell number.

(8) Immediately go to the “Calibrate O2” screen on the secondary, select the calibration

method (Altitude or Standard) and select ready.

The typical mV reading for good sensor is between 8.4mV and 13mV in AIR at sea-level and

between 40mV and 62mV in 100% Oxygen at sea-level.

The HammerHead was designed to be used with 100% oxygen for calibration, using oxygen

percentages less than this will cause errors in calibration and depending on how long the loop is

left to sit, the measured PO2 and mV readings will drop since Oxygen is being consumed and there

is another gas present. The primary and secondary each require calibration. The two handsets are