Yokogawa FU20F - Manual (Page 8)

IM 12B6J3-04E-E
8
2. GENERAL SPECIFICATIONS
2.1 Measuring elements
pH glass electrode
Silver Chloride reference
Solid Platinum electrode
Pt1000 temperature sensor
2.2 Wetted parts
Sensor body
: PPS 40GF (Ryton TM with glass filling)
Measuring sensor : G-glass
Reference junction : Porous PTFE
Earth pin : Solid Platinum
O-ring : Viton
2.3 Functional specifications (at 25°C)
Measuring system
Isothermal point
: pH 7
Reference system : Ag/AgCl with saturated KCl
Glass impedance
- Dome shape
: 200 MΩ nominal
- Flat surface : 700 MΩ nominal
Liquid outlet : Non-flow double junction
Junction resistance : 1 to 15 kΩ
Temperature element : Pt1000 to IEC 751
Asymmetry potential(zero) : 8 ± 15 mV
Slope
: > 96 % (of theoretical value)
Note: The FU20F 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 25º C)
Response time temperature
- Dome shape
: t
90
< 1 min. (for 10 °C step)
- Flat surface : t
90
< 4 min. (for 10 °C step)
Stabilization time pH : < 2 min. (for 0.02 pH unit during 10 sec.)