Hach Lange 2100AN, Instrument Manual

Page: 25 / 108

SECTION 2,
continued
25
2.3.5.4 Application of Heat
WARNING
Make sure the cap on the cell is
loose. Heating a tightly-capped cell
may result in an explosion. ATTENTION
Vérifier que le bouchon sur la cuvette est desserré. Le chauffage d’une cuvette bouchée
hermétiquement peut provoquer une explosion.
ADVERTENCIA
Cerciórese de que la tapa de la célula esté suelta. Calentar una célula cerrada
ajustadamente puede originar una explosión.
WARNHINWEIS
Überprüfen Sie, ob der Verschluß lose auf der Küvette sitzt. Das Erhitzen einer fest
verschlossenen Küvette kann eine Explosion verursachen.
AVISO
Tenha certeza de que a tampa na cela esteja solta. O aquecimento de uma cela tapada
apretada demais pode ocasionar uma explosão.
Avoid use of heat to accelerate degassing whenever possible. Heat may change the
characteristics of the suspended particles, and cause volatile components to come
out of solution. Gentle heating may be helpful in degassing very viscous samples
when combined with application of vacuum or ultrasound. If heating the sample is
necessary, do so only to the extent required to accomplish degassing. Cool the
sample to the original temperature before measurement.
2.3.6 Signal Averaging
The signal averaging feature provides compensation for reading fluctuations
caused by random drifting particles in the sample. Signal averaging may be turned
on or off at any time during measurement by pressing the
SIGNAL AVG
key. When
on, the signal averaging annunciator is lighted. The display is updated
approximately once every second.
Turning on signal averaging causes measurements (adjustable from 1-15) to
accumulate in a measurement buffer. The initial value is displayed immediately.
Subsequent values are an average of readings accumulated in the buffer. After
measurements are accumulated (approximately 1 measurement per second), the
displayed value is a moving average of the specified number of measurements in
the averaging buffer. Select a signal average value of 1 for optimum response
time. Pressing
ENTER
clears the buffer of all stored values and provides an
updated display. If power is turned off and then restored, the instrument defaults to
the signal averaging condition selected during the last measurement.
2.3.6.1 Changing
SIGNAL AVERAGE
Buffer Setting
The 2100AN is shipped from the factory with a default buffer setting of 10
measurements. To change the number of measurements (adjustable from 1-15):
1. Enter the setup mode by pressing
SETUP
. The mode display flashes.
2. Edit the number
09
using the edit keys followed by
ENTER
. Set the number of
measurements (1-15) using the edit keys.
3. Press
ENTER
to accept the new setting. Press
SETUP
to return to the
measurement mode. Pressing
UNITS/EXIT
at any time, prior to accepting the
new value, exits the setup mode leaving original values intact.