User Manual

48 ISP-074-575-P1D
48
measurements already carried out (SAMP) – corresponds with the amount of
benzene pre-filter tubes already used, and the sampling interval period of 45 seconds
(SECS). Pressing the VIEW key shows the datalogger measurement values. Pressing
the MENU key takes you back to the selection menu. Pressing the SAMPLE key
starts the measurement: the pump is activated and measured air is drawn through the
benzene pre-filter tube for 45 seconds. The measurement status is indicated by the
flashing word SAMPLING. The display starts at 45 seconds under SECS and counts
down to 0. So, the displayed number shows the remaining measuring time.
SAMPLE DONE signaled in the display indicates that the measurement is finished.
The benzene pre-filter tube is a one-use device and should not be used for any
additional measurements. Pressing the SAMPLE key will call up the information
that the benzene pre-filter tube in use is no good and that a new benzene pre-filter
tube must be put into the pre-filter tube holder. Only after inserting a new tube will
pressing the SAMPLE key start a new measurement.
Numeric Value, Duration, Time and Date Entry
In cases where the system requires the user to enter a number, duration, time, or
date, the following mechanism is used. The number of digits to be entered depends
on the type of value being entered. Upon entering a value entry screen, a bar icon
below the left most digit highlights it as the active digit. The up (middle soft button)
and down (left soft button) arrows are used to increase/ decrease the digit. The bar
icon is moved to the next digit to the right using the right soft button. Once the user
has finished entering the value, the right soft button is used to move the bar icon to
the far right to highlight the check mark. When the bar is under the check mark, the
left soft button changes to ‘done’. The user is then able to input the value. Pressing
the right soft button while the check mark is highlighted will return the bar icon to
the left most digit.
In some cases, units may be specified (e.g., ppm or hh:mm); in others there may be
no units.
A cancel option is not available to the user as a value must be entered.