IM 12B06J07-02E-E
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2 GENERAL SPECIFICATIONS
2.1 Measuring elements
: pH glass electrode
Sodium glass electrode
Solid Platinum electrode
Pt1000 temperature sensor
2.2 Wetted parts
Measuring sensor
: Glass
Earth pin
: Solid Platinum
2.3 Functional specifications (at 25°C)
Isothermal point
: pH 7, pNa 0
Reference system
: pNa, salt sensitive reference glass
Glass impedance - pH
: 750 MΩ nominal
- pNa : 750 MΩ nominal
Temperature element
: Pt1000 to IEC 751
Asymmetry potential (zero) : 0 ± 15 mV
Slope
: > 90 % (of theoretical value)
Note:
The SC24V temperature sensor is designed for cell compensation and for indication.
It is
NOT
designed for process temperature control.
2.4 Dynamic specifications
Response time pH
: t
90
< 15 sec. (for 7 to 4 pH step)
Response time temperature
: t
90
< 1.5 min. (for 10 °C step)
Stabilization time pH
: < 2 min. (for 0.02 pH unit during 10 sec.)
2.5 Operating range
pH
: 2 to 14 (refer to Table 3)
ORP
: -1500 to 1500 mV
Temperature
: 10 ºC to 120 °C (50 ºF to 248 °F)
Pressure
: 0 to 10 bar (0 to 142 PSIG)
Conductivity
: > 50 µS/cm
Table 3:
pH operating range as function of the ionic strength (pH≥pNa+2)
pNa
Ionic strength [mol ion+ per liter]
pH operating range
0
1
2 to 14
1
0.1
3 to 14
2
0.01
4 to 14
3
0.001
5 to 14
4
0.0001
6 to 14
Note:
The pH operating range is given at room temperature, but at high process temperatures
the lifetime of the sensor will be seriously shortened. For pH values > 12 the accuracy of
the pH measurement will change significantly by the alkali error.
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