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98
12 Instrument description
12.1 Technical data
12.1.1 Inputs
12.1.2 Temperature compensation
12.1.3 Measuring circuit monitoring
12.1.4 Impedance measurement
12.1.5 Binary input
Main input
Measurement/control range
Accuracy
Temperature error
pH
-1 to 15 pH
≤
0.3%
0.2%/10°C
ORP
-1500 to 1500 mV
≤
0.3%
0.2%/10°C
NH
3
(ammonia)
0 to 9999 ppm
≤
0.3%
0.2%/10°C
Secondary input
Temperature
Pt100/1000
(automatic detection)
-10 to 150°C
1
≤
0.5°C
0.05%/10°C
Temperature
NTC/PTC
4 k
Ω
max.
Input via table
with 20 value pairs
≤
0.3%
0.05%/10°C
Measured variable
Compensation
Range
2
pH
yes
-10 to 150°C
ORP
no
not applicable
NH
3
(ammonia)
yes
-10 to 150°C
Inputs
Over/underrange Short-circuit
Cable
break
pH
yes
yes
3
yes
3
ORP
yes
no
no
NH
3
(ammonia)
yes
no
no
Temperature
yes
yes
yes
Impedance measurement can optionally be activated.
Since it depends on some marginal parameters, the following points must be noted:
- Only glass-based sensors are permissible (no ISFET or antimony electrodes).
- The sensors must be directly connected to the transmitter.
It is not permissible to use an impedance converter in the measuring circuit !
- The maximum permissible cable length between sensor and transmitter is 10 m.
- Liquid impedances will directly influence the measurement result.
We therefore recommend activating the measurement in liquids from about 100 µS/cm conductivity upwards.
Activation
through floating contact
Function
Key inhibit
HOLD
Alarm suppression
1
Switchable to °F
2
Please note operating temperature range of sensor !
3
In the case of pH measurement, the sensor can be monitored for short-circuit and cable break by activating the impedance
measurement.
All manuals and user guides at all-guides.com
Содержание 202560
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