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5
System Mode
5.7 Dilution Factor
When samples are above the test range, indicated
by >> on the result screen, a dilution procedure
can be used. Setting Dilution Factor to On will
prompt the Pooltest 25 to automatically request the
dilution factor when carrying out a test.
Change the dilution factor by using the up/down
arrows or manually type the dilution factor. The
instrument will automatically correct the result
for the dilution and display the corrected result
(which will also be stored in the result log).
The maximum dilution factor permitted is 99.
If the calculated result exceeds the available number
of permitted characters >> will be displayed.
NOTE: do not use sample dilution
when measuring pH or alkalinity.
5.8 DPD Range
The Pooltest 25 operates in a choice of DPD ranges,
depending on the pool treatment programme.
Two choices are available and only one range can
be used at any time:
0-5 the 'standard range' of 0-5mg/l (ppm) Cl
In this range the AP 011 and AP 031 DPD
reagent packs are suitable
0-10 the 'extended range' of 0-10mg/l (ppm) Cl
In this range the AP 013 DPD XF and AP
033 DPD XF/XT packs will be required to
carry out the testing.
The selected range of DPD will be indicated in the
Test List e.g. Test 001 Chlorine-Free/10 indicates
the extended range has been selected and the
DPD XF reagent should be used.
5.9 System Lock
To prevent unauthorised or inadvertent changes
to the System settings or log deletion a four digit
code can be used to lock several options.
The default code is set to 6812. To change the
System Lock code, follow the on-screen prompts
to choose a memorable four digit number.
When the System Lock is applied, the items
accessible within the System Mode are limited
until the unlock code is entered. Access is limited
to viewing the result log, adjusting the backlight,
contrast and settings.
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5.10 Water Balance
Two options are available for the Test 77 Water
Balance scale:
Palintest uses the simplified Palintest scale
which assumes values for Total
Dissolved Solids (TDS) and temperature
and removes the need to measure
these parameters.
Langelier uses the results from a TDS/
temperature meter to calculate the
Langelier Saturation Index (LSI) value.
For more information, see both the test method on
page 26 and visit www.palintest.com\know for more
information regarding the importance of Water
Balance and the relationship between the two scales.
5.11 Temperature
Choose between ºC and ºF. The temperature setting
is used during the Langelier Saturation Index when
selected from the Water Balance option.
5.12 Language
Select the desired local language for operation,
.
choosing from English, French, Spanish, German,
2
Italian and Chinese (Mandarin). The selection of
language will also adjust appropriate tests and
units to local convention as required.
.
2
5.13 Set Time/Set Date/Date Format
All test results are recorded automatically in the
Data Log and appended with date and time (plus
additional information). Date and time are stored on
an internal clock, supported by a coin cell battery.
To correct the time select Set Time from the System menu.
Use the up/down keys to adjust the hour; press
the right key to select and adjust the minutes.
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