Xylem WTW Multi 3320, Руководство по эксплуатации

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Multi 3320 Conductivity
ba77053e04 07/2018
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Stability control
(AutoRead )
The stability control function ( AutoRead ) continually checks the stability of the
measurement signal. The stability has a considerable impact on the reproduc-
ibility of measured values (see section 10.2.3 A
UTOMATIC
S
TABILITY CONTROL
,
page 71).
Criteria for a stable
measured value
The Stability control function checks whether the measured values are stable
within the monitored time interval.
The minimum duration until a measured value is assessed as stable is the mon-
itored time interval. The actual duration is mostly longer.
Freezes the mea-
sured value (HOLD
function)
With the HOLD function, you can freeze the current measured value. The dis-
played measured value stops changing until you switch the HOLD function off.
9.1.2 Measuring the temperature
For reproducible conductivity measurements, it is essential to measure the
temperature of the test sample.
The temperature is automatically measured by the temperature sensor
(NTC30 or Pt1000) integrated in the sensor.
The factor to calculate the total dissolved solids is set to 1.00 in the
factory. You can adjust this factor to meet your requirements in the
range 0.40 ... 1.00. The factor is set in the
Measurement menu for
the parameter, TDS.
Measured
parameter Time
interval Stability in the time interval
Conductivity
ϰ
10 seconds
Δ
: better than 1.0% of measured value
Temperature 15 seconds
Δ
: better than 0.5 °C
1. Freeze the measured value with <AR> .
The [HOLD] status indicator is displayed.
2. Release the frozen measured value again with <AR> .
The HOLD function is switched off.
The [HOLD] status display disappears.
The conductivity sensor
KLE 325
has an integrated temperature
sensor.