Almeco ALMEMO V5 5990-2, Руководство по эксплуатации

Страница: 29 / 77

Function ´Zero Point Adjustment´ using the key: <
ADJ
>
Meas.Val:
00: °C
©
00.0
Zero Point:
ZeroPoint: 23.4°C
The meas. value is not indicated as zero but as the negative base
value after the adjustment, if a base value has been programmed.
For some sensors the same key can be used to adjust the sensor with the
following specific functions:
1. Dynamic pressure probes are very delicate and should be adjusted in an
unpressurized state before each use (i.e. disconnected hoses or Pitot tube
out of flow). The correction value must be entered before the conversion
'pressure-to-velocity' is performed. For the ranges L840 and L890 an
adjustment is possible even if the channel is locked. The zero point error is
temporarily being written into the calibration offset until the switch-off is
performed.
2. With the following sensors, a slope adjustment is performed in the same
way for the corresponding calibration value:
pH probe: ZA 9610-AKYx: pH4 or pH10
Conductivity: FY A641-LF: 2.77 mS/cm,
FY A641-LF2: 147 uS/cm
FY A641-LF3: 111.8 mS/cm
O
2
saturation: FY A640-O2: 101 %
6.3.2 Setpoint Entry
For the correction of sensor errors the zero point adjustment has already been
introduced in section 6.3.1. For a two-point adjustment it is further necessary to
correct the slope (gain) by performing a comparison with a second measuring
point. With the function ´Setpoint Entry´ the correction factor is automatically
determined and stored as factor in the sensor connector.
1. Set sensor to the ´zero state´
(ice water, unpressurized etc.),
Set the meas. value to zero by using the keys (s. 6.3.1).
<
ZERO
> or <
ADJ
>
2. Put sensor to a defined setpoint
(boiling water, known weight etc.),
Enter the setpoint in function ´Setpoint´:
SetPoint: °C 100.0
3.
Calibrate the measured value in function ´Setpoint´:
<
ADJ
>
Afterwards, the measured value, as well, should indicate the set point.
In this case, as well, the locking level must be set below 5 to allow a
programming of the factor (see 9.4).
ALMEMO
®
5990-2 29
Measuring using the measurement menus