Procedure
1. Open - Main Menu → Analyser State Menu → Pressure & Flow Menu.
2. Turn OFF the vacuum pump and allow the instrument to return to ambient.
3. Disconnect all external tubing connected to the rear ports of the instrument.
4. After two-five minutes observe the pressure readings of ambient and cell. Ensure that they are
reading the same ± 3 torr (± 0.4 kPa).
5. If the readings are outside this level, perform a pressure calibration (refer to Section 5.3).
If the calibration fails the instrument may have a hardware fault. The cell pressure PCA has test points.
To determine if the pressure sensor is faulty simply measure the voltage on the test points show in the
photos. The voltage measured across the test point is proportional to the pressure measured by the
sensor so if the sensor is exposed to ambient pressure at sea level the voltage will be around 4 volts
but if the sensor is under vacuum the voltage will be low (e.g. 0.5 volts). If the test point measures zero
or negative voltage, the assembly is most likely faulty and will need to be replaced.
Figure 143 – Test Point Location
6.5 Bootloader
The Serinus Bootloader is the initial set of operations that the instruments’ microprocessor performs
when first powered up (similar to the BIOS found in a personal computer). This occurs every time the
instrument is powered up or during instrument resets. Once the instrument boots up, it will
automatically load the instruments’ firmware. A service technician may need to enter the Bootloader
to perform advanced microprocessor functions as described below.
To enter the Bootloader turn OFF the power to the instrument. Press and hold the plus key while
turning the power on. Hold the Plus key until the following screen appears.
** Ecotech Serinus Analyser **
V3.1 Bootloader
Press ‘1’ to enter Bootloader
If the instrument displays the normal start up screen, the power will need to be toggled and another
attempt will need to be made to enter the Bootloader. Once successful, press 1 to enter the
Bootloader Menu.
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