Manual Aqua M300D
page 20
9.1 Putting the Device into Operation
As soon as you change to trace gas detection on the display when the hydrogen sensor is connected, the device
recognises the sensor and warms it up to operating temperature. This warm-up phase takes approximately 3
minutes and is displayed as a green progress bar (1) below the numerical display. The sensor self-calibrates
during the warm-up phase. This self-calibration is designed to determine the base value for the different
hydrogen concentrations that are detected during measuring. The sensor calibrates independently according to
the existing hydrogen concentration in the surrounding air. Therefore, it is especially important that you ensure
that the sensor is not near any relevant hydrogen source during the warm-up phase. So we recommend that you
either go outside into the open with the Aqua M300 during the warm-up phase or remain in places where you
know that the hydrogen concentration is low (<1 ppm H2). As soon as the sensor has reached its operating
temperature, the warm-up bar disappears and the Aqua M300 is ready to use.
9.2 Display
You can read and adjust the following parameters and carry out the following actions on the display for trace gas
detection:
•
Bar display (1) and the number which displays the current measurement underneath it
•
Preset alarm threshold (2)
•
Digital display with the current measuring value (3)
•
Six position bars for the bar display (4) and the numerical display (5) of the previous measurements. The first
measurement is displayed on position 1, each additional measurement shifts the previous measurement to
the right. When position 6 has been reached, the oldest of the six measurements, the measurement on
position one, will be cleared so that the last measurement which was taken is always displayed on position 1.
•
Start/Stop symbol and recording symbol respectively (6) to start and end a measurement
•
Perform zero calibration (7)
•
Switch the measuring tone on and off central unit(8)
•
Define the alarm threshold (9)
•
Switch the measuring tone on and off headphones (8)