Yokogawa FU20/PH20 All-in-One pH/ORP Sensor - Manual (Page 4)

IM 12B6J3-02E-E
2
2. GENERAL SPECIFICATIONS FU20
2-1. Measuring elements : pH glass electrode
: Silver chloride reference
: Solid platinum electrode
: Pt1000 temperature sensor.
2-2. Construction materials
Body
: PPS 40GF (Ryton with glass filling)
Earthing pin : Solid Platinum
O-ring : Viton
Reference junction : Porous PTFE
Cable : Coaxial with 4 extra leads
2-3. Functional specifications (at 25°C)
Isothermal point
: pH 7
Glass impedance
- Dome shape : 250 to 500 M Ω
- Flat Surface : 400 to 1000 M Ω
Reference system : Ag/AgCl with saturated KCI
Junction resistance : 1.0 to 10 k Ω
Liguid outled : non-flow double junction
Temperature element : Pt1000 to IEC 751
Asymmetry potential : 8 ± 15 mV
Slope : > 96 % (of theoretical value)
NOTE: ThetemperaturesensorincludedintheFU20isintendedtoprovideindicationand
cellcompensation.Theconstructionhasnotbeentestedtothepressurevessel
standardsrequiredforplanttemperaturecontrol.
2-4. Dynamic specifications
Response time pH step (7 to 4)
: < 15 sec for 90%
Response time temp step (10°C)
- Dome shape : < 3 min for 90%
- Flat Surface : < 6 min for 90%
Stabilisation time (0.02 pH unit/ 10 s) : < 2 minutes
2-5. Operating range
pH
: 0 to 14
Temperature : -10 to 105 °C (14 to 221 °F)
Pressure : 0 to 10 bar ( 0 to 145 PSIG)
Conductivity : > 50 µS/cm
Storage temperature : -10 to 50 °C (14 to 122 °F)
NOTE: Specificationsshouldnotbeconsideredinisolation.ForexamplethepHrangecan
be2-12pH,wherethemeasurementisatelevatedtemperatures.Foradviceabout
specificapplicationspleasecontactyoulocalsalesoffice.