Hach Ultra MET ONE 237AB, User Manual

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20
Operation
5.3.2.3 Set the sample period and hold time
Note: Set the HOLD time to a minimum of 10 seconds when the printer is enabled. A sample record
will be overlooked when calculating the average counts, because of printer operation during the
calculations. All the samples will be stored in the Memory buffer and will print the average report if
printed at a later period.
To set the sample period to 1-minute and hold time to 10-seconds in automatic
mode:
1. Press and hold the
SELECT
key until the PER light is lit and the 7-digit display shows
the current period setting in HH:MM:SS format, for example: 00:00:06 0.
2. Press and hold the
PROG
key. The light on the
PROG
key turns red and the HH digits
begin to flash.
3. Press and hold the
SELECT
key until the required digits begin to flash. Use the
UP
and
DOWN
arrow keys to change the selected digits to the required value.
4. 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 on the
PROG
key will turn off.
5. Press and hold the
SELECT
key until the HOLD light is lit and repeat steps 2 through
4 to set the HOLD time.
5.3.2.4 Sampling for the automatic modes
The following situation is an example to program a MET ONE 237 particle counter to
verify the cleanliness of a large room. The space is divided into eight sections to make
sure comprehensive measurement.
Figure 8 Program sampling pattern
1 Sections of a large room (1–8)