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Measuring Method
● Supply of High Voltage Current
When "wait" is not blinking, press "MEAS/CLN" key to supply high voltage current. Then
the high-tension pointer in the high-tension block is seen to move right and remain in the
black part of the block. The operating status shifts to "ready", indicating measurement may
begin. As is shown in the figure below, if the high-tension pointer can never enter the middle
of the high-tension block, please turn off the instrument to confirm if the probe is inserted
properly.
2002/12/12
120s STORE
0 . 4 0
READY
● Beginning of Measurement
Press "START" key and the instrument will begin to measure. The blinking concentration value
shows when the set time (measurement mode) is reached, it will stop automatically. If the
concentration value is not blinking, the final concentration value measured is reached. Then
"STORE" will be blinking at the record number, prompting the data be stored. Press "MEMORY"
key to keep the data (or not to keep it). Press "START" key again and new measurement can
begin.
a. If in the course of measurement you press "START" key, measurement will stop and
concentration will indicate "--.--". This method can be adopted for emergency stop
in the measuring process.
b. If in the course of measurement, you press "MEAS/CLN" key, measurement will
stop and concentration will indicate "----". This method can be adopted for
emergency stop due to high voltage cut-off.
c. If in the course of measurement 2000Hz is exceeded because of too much dust
absorbed by the crystal, surplus frequency will indicate blinking "cleaning". If the
measurement mode of 120s or 24s is selected, the measurement may proceed.
After the measurement is finished, high-tension is cut off automatically, the crystal
needs cleaning. The data can be stored. If any other mode is used, the
measurement should be stopped immediately.
d. From press "START" key about 5 seconds, the measurement data is "0.00 mg/m
e. After measuring， "STORE"is flashing here，clue to storing the data.
f. The concentration value is only a reference during measuring, the concentration
value which shown when the measuring is finished is the final value.
● End
At the end of the first measurement, press "MEMORY" key to store the measured value. If
anther measurement is necessary, press "START" key again. If not, press "MEAS/CLN" key
to cut off high-tension and then turn off the power source to end this measurement. If too
much dust is formed on the crystal in line with the surplus frequency, the crystal should be
12
12:12:12
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When high-tension pointer points here and
operating status shifts to "ready"
After measurement is over,
"STORE" will be blinking
here,
prompting
stored.
data
be
3
".
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