Ahlborn ALMEMO 2390-5 Instructions d'exploitation télécharger pdf (Page 26)

In the ´AJ´ function the measured value appears in the display, initially flashing;

this should be the measured value expected after adjustment, i.e. either the

normal 0.0 or a scaled value, e.g. 7.00 for pH probes.

So long as the corrected measured value is shown (rather than the

actual measured value), the CORR arrow appears in the display.

If only an ´A´ appears as function, this means that the zero-point correcti-

on function is locked at level 4 or above; (see Section 7.2). In this case

the corrected value is not saved to the connector’s EEPROM but only to

the RAM; i.e. once the device is switched off, then the next time it is swit-

ched on, this will be restored to its original value.

pH,- conductivity- and O

probes cannot be zero-point setting,

but to adjusted only permanently.

If you prefer to have the new zero-point saved more permanently, then,

before zero-setting, briefly and temporarily lower the locking mode to

level 3 by switching on the device with the PROG and FUNCTION keys held

down. When you switch off, the corrected value will then be retained;

(the locking mode, however, will be restored to its original level).

In the case of dynamic pressure probes the zero-point error is generally

saved to the calibration offset only temporarily (i.e. until you switch off) -

irrespective of whether locking applies.

Gain adjustment can be performed for the following sensor types using the sa-

me function, assuming the appropriate calibration value is available :

pH probe: ZA 9610-AKY 4.00 pH or 10.00 pH

Conductivity: FY A641-LF: 2.77 mS/cm,

FY A641-LF2: 147.0 uS/cm

FY A641-LF3: 111.8 mS/cm

saturation: FY A640-O2: 101 %

FY A600-O2 20,9 % O

Gain adjustment, e.g. pH 10: , ,

PROG

▼

PROG

1: `1 0.0 0´AJ

One especially simple procedure for sensor adjustment can be set

up by locking the sensor in locking level 6.

- It is then no longer necessary to pass via the adjustment menu with

zero-setting.

- To initiate sensor adjustment press and hold down the PROG key;

then, as soon as the setpoint appears in function ´AJ´, you can per-

form sensor adjustment - without having to cancel the locking mode

- by simply pressing the PROG key again.

26 ALMEMO

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2390-5

Measuring operations

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Ahlborn ALMEMO 2390-5 Instructions d'exploitation Page 26

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