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Technical data
13.8.2
Temperature compensation
Compensation type
TC linear (
1
)
TC curve
TDS
Natural water in accordance with DIN EN 27888
Natural water with extended temperature range (
ASTM D-1125-95 (neutral, alkaline and acidic impurities)
NaOH 0 to 12 %
NaOH 25 to 50 %
HNO3 0 to 25%
HNO3 36-82%
H2SO4 0 to 28 %
H2SO4 36-85%
H2SO4 92 to 99 %
HCl 0 to 18%
HCl 22 to 44 %
(
1
) TC: Temperature coefficient
2
(
) The temperature compensation for "natural waters with extended temperature range" also goes beyond the standardised
temperature limits of DIN EN 27888.
13.8.3
Monitoring the measuring circuit
Input / sensor
pH (glass electrode)
pH (ISFET)
Conductivity conductive Yes
Conductivity inductive
Universal input for
connection of: Voltage /
current signal,
resistance thermometer
Universal input for
connection of:
Resistance Pot / WFG
(
1
) Through impedance monitoring and coverage detection the sensor alarm is triggered if an error occurs. Monitoring by impedance
measurement can be activated as an option. The following points should be noted for their correct function:
n
Impedance measurements are only possible with glass-based sensors.
n
Sensors must be connected to an analysis input for pH / redox / NH
n
The loop must not have any impedance converters installed.
n
The maximum permissible cable length between the sensor and the device is 10 m.
n
Liquid resistors are included in the measurement result. As such, we recommend you activate the impedance measurement in
liquids with a minimum conductivity of about 100 μS/cm.
2
(
) Errors in the measuring circuit (short circuit or open circuit) cause display errors (measuring range shortfall or excess or invalid
value).
417102269 Rev. 2-08.2020
2
)
Measuring range
Short circuit /
shortfall / excess
sensor break Line break
Yes
configurable
impedance
measurement (
Yes
No (
No (
Yes
No (
Yes
No (
No (
2
)
No (
248
Compensation range
-50 to +250 °C
-50 to +250 °C
-50 to +250 °C
0 to 36 °C
0 to 100 °C
0 to 100 °C
0 to 90 °C
10 to 90 °C
0 to 80 °C
-20 to +65 °C
-17 to +104 °C
-17 to +115 °C
-17 to +115 °C
10 to 65 °C
-20 to +65 °C
configurable
impedance
1
)
measurement (
2
2
)
No (
)
2
)
2
2
)
No (
)
2
)
No (
2
)
2
)
No (
2
)
on the device.
3
Particularities
-
1
)
-
Only for 4-wire
circuit (
1
)
-
-
-
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