12
1. Polling - The Mark 25 will provide the
digital output only when polled by the
host computer.
2. Periodic - The Mark 25 will
automatically provide a digital output
at a 30 second interval.
Press the <CALIB> until the display
indicates the user prompt, uSr. Next,
press the <UP ARROW> key. The
display will prompt with id and all
parameter LED’s will be lit and flashing.
Use the <UP> or <DOWN ARROW>
key to advance to the serial prompt,
SEr. When the <CALIB> is pressed, the
Mark 25 will display PoL. To change the
output to periodic interval, press either
the <UP> or <DOWN ARROW> key
until the Mark 25 displays PEr.
To return to the monitor mode, press the
<RUN> key.
3.10 Setting the Auto-Ranging
Function
The Mark 25 can be set up to
automatically range between the low,
medium, and high ranges for raw and
temperature-corrected conductivity.
Press the <CALIB> key until the display
indicates the user prompt, uSr. Next,
press the <UP ARROW> key. The
display will prompt with id and all
parameter LED’s will be lit and flashing.
Use the <UP> or <DOWN ARROW>
key to advance to the auto-ranging
prompt, AUrG. When the <CALIB> key
is pressed, the Mark 25 will display
OFF. To activate the auto-ranging
function, press either the <UP> or
<DOWN ARROW> key until the Mark
25 displays On. Press the <CALIB> key
to activate the selection in the Mark 25’s
memory.
Pressing the <RUN> key returns the
Mark 25 to monitor mode.
3.11 Troubleshooting
The Martek Mark 25 represents over
thirty years of experience in conductivity
measurements and, as such, has been
designed to provide simple, reliable
operation for many years.
To obtain optimum performance from
the Mark 25, care should be taken to
ensure the sensor has adequate flow
and is free of obstructions. In addition, it
is important to maintain correct
calibration on a regular basis.
Comparison of the Mark 25 to a referee
system is the preferred method of
validation, however, calibration using
the Mark 25’s internal circuitry is also
acceptable.
In the event a problem develops with
the Mark 25 that cannot be resolved
through calibration, contact Martek
Instruments directly via telephone, fax,
or e-mail located at our website,
www.martekinstruments.com.
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