Yokogawa SC25V - Manual (Page 5)

5
IM12B6J1-40E-E
2. GENERAL SPECIFICATIONS
2.1 Measuring elements
pH glass electrode
Silver/Silver Chloride reference
Titanium liquid earth
Pt1000 temperature sensor.
2.2 Construction materials
Wetted materials:
O-ring
: Viton
Earth Ring : Titanium
Reference Junction : Porous PTFE
Measuring Sensor : Glass
Body Sensor
: Glass, PEEK
2.3 Functional specifications
Isothermal point
: pH 7
Glass impedance G-Glass
: 225 M Ω
Glass impedance L-Glass
: 600 M Ω
Reference system : Double junction, Ag/
AgCl with saturated KCI,
including Ag+ ion trap
Junction resistance : 0.2 to 10 k Ω
Temp. element : Pt1000 to IEC 751
Asymmetry potential : 8 ±15 mV
Slope
: > 96 %
(of theoretical value)
Sensor length : 120 mm and 225 mm
Note: The temperature sensor included in the
SC25V is intended to provide indication
and cell compensation. The construction
has not been tested to the pressure
vessel standards required for plant
temperature control.
2.4 Operating range
pH
: 0 to 14
Temperature
Type G-glass : -10 to 80°C
(14 to 176°F)
Type L-glass : +15 to 130°C
(59 to 266°F)
Pressure : 0 to 10 bar (0 to 145 psi)*
Conductivity : > 10 μS/cm
Storage temp. : -10 to 50°C (14 to 122°F)
* Damaging the screw thread might influence
the max process pressure.
Note: Specifications should not be considered
in isolation. For example the pH range
can be 2-12pH, where the measurement
is at elevated temperatures. For advice
about specific applications please contact
your local sales office.
2.5 Dynamic specifications
Response time pH step (7 to 4)
: < 5 sec for 90%
Response time temp step (25°C)
: < 90 sec for 90%
Stabilization time (0.02 pH unit/10 s)
: < 30 seconds