1.General Introduction
Yokogawa PH20 is a four in one analog PH & ORP sensor which applicable for temperature fluctuation process, it owns a wide chemical resistant PVDF body sensors hold four separate measuring elements, pH, reference, temperature, ORP measure elements. The sensor is nicknamed “Tempress” because of the patented compensation for changes in the process temperature and pressure. A simple mechanical feature makes the sensor more accurate, and gives it a longer lifetime. The compensation panels flex to accommodate changes in the avoiding large differential pressures across the diaphragm which prevents most problems associated with the reference junction.
2.General Specifications
Items | Description |
Measuring principle | pH glass electrode, Silver Chloride reference, Solid Platinum electrode, Pt1000 temperature sensor |
Wetted parts | Sensor body: PVDF O-ring: Viton Reference junction: Porous PTFE Cable: Coaxial with 4 extra leads Sheet material Thermoplastic rubber |
Functional specifications (at 25°C) | Isothermal point: pH 7 Glass impedance: 200 MΩ (nominal), G-glass Reference system: Ag/ AgCl with saturated KCI Junction resistance: 1 to 10 kΩ Temperature element: Pt1000 to IEC 751 Asymmetry potential: 8 ± 15 mV Linearity PH (Slope): > 96 % (of theoretical value) |
Dynamic specifications (at 25°C) | Response time pH step (7 to 4): < 15 sec for 90% Response time temp step (10°C): 1 min for 90% Stabilization time (0.02 pH unit/10 s): < 2 minutes |
Operating range | pH: 0 to 14 ORP: -1500 to 1500 mV rH: 0 to 100 Temperature: -10℃ to 105℃ (14℉ to 221℉), Pressure: 0 to 10 bar (0 to 142 PSIG) Conductivity: > 50μS/cm |
3.Model Selection
Main Code | Suffix Codes | Description | |||||
PH20 | “4 in 1” combination sensor | ||||||
Material | -F | PVDF | |||||
Membrane | -G | Dome shaped | |||||
Cable length | -02 | 2 meter | |||||
-05 | 5 meter | ||||||
-10 | 10 meter | ||||||
-20 | 20 meter | ||||||
-30 | 30 meter | ||||||
Temp. element | -T1 | Pt1000 | |||||
-N -A | Always -N-A | ||||||
Options | /SN3 | Stainless steel 3/4” NPT adapter (316L) | |||||
/SR3 | Stainless steel 3/4” R adapter (316L) | ||||||
/FN4 | PVDF 1” NPT adapter | ||||||
/FR4 | PVDF 1” R adapter | ||||||
/PH8 | Adapter for PH8 combi sensor fittings (only) | ||||||
/SF4 | Stainless steel adapter for FF40, FS40 and FD40 fittings | ||||||
/HCNF | Hastelloy cleaning system | ||||||
4.External Dimensions
