Hach Ultra MET ONE 237AB, User Manual

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19
Operation
5.3.2 Automatic mode
In the automatic mode, the MET ONE 237 particle counter automatically takes a specified
number of samples and stops, allowing unattended operation. The automatic mode
covers the typical programming requirements for the common functions associated with
the MET ONE 237 particle counter.
Note: The MET ONE 237 particle counter need not be programmed in any order but maybe
programmed anytime without affecting others.
To start the Automatic mode :
1. Press and hold the
MODE
key until the AUTO light is lit.
5.3.2.1 Set location numbers
To set location numbers in the automatic mode:
1. Press and hold the
SELECT
key until the OPT light is lit.
2. Press the
UP
or
DOWN
arrow key until the 3-digit display shows Loc. The 7-digit
display will show a number (Default number seen is 32).
3. Press and hold the
PROG
key. The light on the
PROG
key will turn red and the digits
on the 7-digit display flashes.
4. Press the
DOWN
arrow to change the location number to 1.
5. Press and hold the
PROG
key. The red light on the
PROG
key will turn off and the
digits in the 7-digit display will not flash now.
5.3.2.2 Set the number of cycles
The number of cycles indicates the number of times the counter will repeat the sampling
cycle determined by the programmed Period time and Hold time (three cycles is typical
for a routine verification check).
Programming a number of cycles greater than one automatically causes the MET ONE
237 particle counter to enter the ‘Average’ mode. An Average mode shows the average
count cycles and generates a report for the printer and the memory buffer. For example, if
the number of cycles is set to three, the counter will take three samples of the
programmed Period length with the hold period being of programmed Hold length. The
printer will print the results of each of the three sample periods when they are completed.
The fourth report indicating the average count in each size range over the three samples
is printed next. If the records are printed from the Memory Buffer at a later time, the
printout will be identical.
To set the number of cycles:
1. Press and hold the
SELECT
key until the OPT light is lit.
2. Press the
UP
or
DOWN
arrow key until the 3-digit display shows CYC . The 7-digit
display will show a number on the right.
3. Press and hold the
PROG
key. The light on the
PROG
key will turn red and the digits
in the 7-digit display will begins to flash.
4. Press and hold the
SELECT KEY
till the required digits begin to flash. Use the
UP
and
DOWN
arrow keys to change the selected digits to the required value.
5. Press and hold the
PROG
key to save the new settings and exit the programming
function. The digits will not flash now and the red light in the
PROG
key will turn off.