Installation, operating and maintenance manual
UNIGAS 300
DDG6004MHGB/08-2017/Rev.A2 Software version from M 1.3.40 and D 2.3.37
29
7 Maintenance
7.1 Adjusting
Menu item 12 in UNIGAS 300 can be used to adjust the temperature sensor and/or the pressure sensor to
increase the measurement accuracy.
The pressure sensor can be adjusted with an offset value (p_offset). Modifying this value will result in that the
measured pressure over the entire range is increased or decreased by this value.
The temperature sensor can be adjusted by an offset value (tcorr_0) and by entering a span. This span can
be set for the measuring range from -40 °C to 0 °C (tcorr_min.) and for the measuring range from 0 to 55 °C
(tcorr_max).
As a rule, tcorr_0 is set at -0.24 °C for correction of the 3-m length of cable with which the temperature sensor
is connected.
The value of span is expressed in °C/°C and can be determined as follows (X °C is a random temperature
higher than 0 °C or a random temperature below 0 °C):
Span = deviation at X °C – deviation at 0 °C
X °C – 0 °C
Proceed as follows:
12. Adjusting
►
Screen 12-x: p_offset, tcorr_min, tcorr_0, tcorr_max
►
for activating, value starts blinking
▼
and
▲
to modify the value
►
confirm, confirmation will only be accepted if the
programming switch is operated simultaneously. The
value will stop blinking.
◄
to return
7.2 Replacing the pressure sensor or the temperature sensor
The seal must be broken in order to replace the pressure sensor or the temperature sensor. Then unscrew the
bolt, see chapter 4, fig. 4, item 5.
Now remove the battery, the cables to the terminal strip and the protective cover.
Replace the pressure sensor or the temperature sensor and put the protective cover and the cables back in
place. Finally, put the battery back. When the housing is closed, UNIGAS 300 will automatically take over the
data from the pressure sensor. This can be checked by the serial number, see menu item 9 (System).
Subsequently, UNIGAS 300 must be checked for accuracy. As the power to UNIGAS 300 has been interrupted,
it must be checked whether the clock is running correctly. If necessary, the clock must be set.
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