Yokogawa FU20

General Introduction

Yokogawa FU20 is a four in one analog PH & ORP sensor which applicable for slurry, solids, high salt concentration process, it owns a wide chemical resistant PPS 40GF body sensors (26 mm diameter) hold four separate measuring elements, pH, reference, temperature, ORP measure elements. Installation is simple with the integrated industrial 3/4” tapered thread. Temperature fluctuations are compensated to extend the sensor life which is targeted at applications where simplicity will result in accurate and reliable pH- or redox measurement. The Quick Release Adapters for the FU20 allow easy removal of the sensor for cleaning and calibration.

2.General Specifications

Items	Description
Measuring principle	pH glass electrode, Silver Chloride reference, Solid Platinum electrode, Pt1000 temperature sensor
Wetted parts	Sensor body: NPT, FSM: PPS GF40: FTD : PVDF- (GF25+TZ24) Earth pin: Solid Platinum Measuring sensor: G-glass LE glass tube: AR-glass O-ring: Viton-FTS and FSM,FTD and NPT Reference junction: Porous PTFE
Functional specifications (at 25°C)	Isothermal point: pH 7 Reference system: Ag/ AgCl with saturated KCI Glass impedance: Dome shape nominal 200MΩ, Flat Surface nominal 700MΩ Junction resistance: 1 to 15 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): Dome shape< 1 min for 90%, Flat Surface< 4 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: Dome shape -10℃ to 105℃ (14℉ to 221℉), Flat surface 15℃ to 105℃ (59℉ to 221℉) Pressure: 0 to 10 bar (0 to 142 PSIG) Conductivity: > 50μS/cm

3.Model Selection

Main Code	Suffix Codes				Description
FU20					Wide Body sensor
Cable length	-03				3 m cable, not available for FTD, FTS and MTS
	-05				5 m cable, not available for FTD, FTS and MTS
	-10				10 m cable, not available for FTD, FTS and MTS
	-20				20 m cable, not available for FTD, FTS and MTS
	-VP				No Cable; Vario Pin connector
	-VS				No Cable; Vario Pin for SENCOM connector
Temp. Sensor		-T1			Pt1000
Temp. Sensor		-T2			Pt100 (not available for FTD, FTS,MTS and VS)
Model			-NPT		PPS body / Tapered Thread / Dome shaped
			-FSM		PPS body / Tapered Thread / Flat Surface
			-FTD		PVDF body / Tapered Thread / Dome shaped
			-FTS		PVDF body / Tapered Thread / Salt Sensitive membrane/ Silicone sealing
			-MTS		PVDF body / Tapered Thread / Salt Sensitive membrane/ FFKM sealing
Options				/HCNF	Complete Hastelloy cleaning system
				/FPS	Adapter F*40 from PPO
				/NSS	1” NPT, SS316
				/NTI	1” NPT, Titanium
				/BSS	1” BSP, SS316
				/BTI	1” BSP, Titanium

4.External Dimensions