Yokogawa SC25F - Manual (Page 8)

IM 12B6J1-41E-E
8
2. GENERAL SPECIFICATIONS
2.1 Measuring elements : pH glass electrode
: Silver Chloride reference
: Solid Titanium electrode
: Pt1000 temperature sensor
2.2 Wetted parts
Sensor body
: Glass, PPS
Measuring sensor : G-glass or L-glass
Reference junction : Porous PTFE
Earth pin : Solid Titanium
O-ring : FKM (Viton)
2.3 Functional specifications (at 25°C)
Measuring system
Isothermal point
: pH 7
Reference system : Ag/AgCl with saturated KCl
Glass impedance - G-glass : 400 M Ω nominal
- L-glass : 775 M Ω nominal
Liquid outlet : Non-flow junction
Junction resistance : < 10 k Ω
Temperature element : Pt1000 to IEC 751
Asymmetry potential(zero) : 8 ± 15 mV
Slope
: > 96 % (of theoretical value)
Note: The SC25F temperature sensor is designed for cell compensation and for indication.
It is NOT designed for process temperature control.
2.4 Dynamic specifications
Startup time sensor
: < 60 sec.
Response time pH : t
90
< 15 sec. (for 7 to 4 pH step at 25 ºC)
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*
: 0 to 14
Temperature** - G-glass : -10 °C to 80 °C (14 °F to 176 °F)
- L-glass : +15 °C to 125 °C (59 °F to 257 °F)
Pressure (static) *** :
Conductivity : > 10 µS/cm
Note* : The pH operating range is 0-14 pH, but using the sensor at temperature- and / or
pH-extremes will seriously shorten the lifetime.
Note** : The operating temperature for sensor in combination with PR10 retractable fitting
is limited to 80 ºC
Note*** : Process pressure fluctuations will shorten the lifetime of the sensor
p(bar)
Temp. (ºC) -10 25 130 50 100 0
5
0
10