SC25V-ALP25-120 Yokogawa SC25V Datasheet & Technical Manual

Yokogawa SC25V-ALP25-120 SC25V Combined pH Sensor Electrode

Yokogawa SC25V-ALP25-120 SC25V Combined pH Sensor Electrode

Availability: 20 left in stock

Yokogawa SC25V-ALP25-120 Combined pH Electrode The Yokogawa SC25V-ALP25-120, also cataloged as the SC25V Combined pH Electrode, operates as a dedicated...

SKU: SC25V-ALP25-120

Manufacturer: Yokogawa
Product No.: SC25V-ALP25-120
Product Type: Proximity Sensors
Product Origin: JAPAN
Payment:T/T, Western Union
Weight: 260g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Yokogawa SC25V-ALP25-120 Combined pH Electrode

The Yokogawa SC25V-ALP25-120, also cataloged as the SC25V Combined pH Electrode, operates as a dedicated hardware component for electrochemical pH potential measurement and integral temperature sensing within process control analytical loops. The assembly transmits analog potential signals and RTD resistance across industrial wet-process lines to evaluate process chemistry in real time.

Suffix Breakdown & Model Matrix

SC25V: Base model specifying a combined 12 mm process sensor equipped with pH glass electrode, reference system, titanium liquid earth, Pt1000 temperature element, and a Variopin connector.
ALP25: High-temperature and chemical-resistant sensor variant supporting analog output with intrinsic safety (IS) approvals for ATEX, IECEx, FM-US, and FM-CAN.
120: Insertion shaft length specifying 120 mm.

Hardware Specifications

Parameter	Specification
Model	SC25V-ALP25-120
Brand	Yokogawa
Origin	Japan
Weight	0.26 kg (Shipping Weight: 1 kg)
Dimensions	300 x 100 x 75 mm (Package Dimensions)
Operating Temp	15 to 130 deg C
Power Consumption	Passive sensor element (External loop powered via transmitter)
Sensor Diameter	12 mm
Sensor Length	120 mm
Connector Type	Variopin
Body Material	PEEK and AR-Glass
Measuring Glass	Glass (Type G or L)
Reference System	Silver / Silver Chloride (Ag/AgCl)
Reference Junction	PTFE
Liquid Earth Pin	Titanium
Internal Temperature Sensor	Pt1000 RTD
O-Ring Seals	Viton (backed up with EPDM)
pH Measurement Range	0 to 14 pH
Pressure Range	0 to 10 bar (0 to 142 psig)
Glass Impedance	Nominal 700 Mohm
Ingress Protection	IP67
In-Situ Sterilization	Up to 135 deg C (CIP / SIP compatible)
Hazardous Area Approvals	ATEX, IECEx, FM-US, FM-CAN (Intrinsically Safe)

Channel-to-Channel Isolation & Cold Junction Compensation

The analog glass potential and reference signals operate in conjunction with an integrated titanium liquid earth pin that grounds the process fluid directly at the sensor tip. This physical grounding pathway eliminates stray ground loop currents through field piping, stabilizing the high-impedance (700 Mohm) pH glass signal before conditioning at the analyzer transmitter input stage. High galvanic isolation within the downstream transmitter isolates the dual-element potential from plant ground potentials, while the embedded Pt1000 RTD continuously delivers precise thermal data for dynamic temperature compensation algorithms, preventing thermal drift across fluctuating process temperatures.

Frequently Asked Questions

Q: How does the titanium liquid earth pin prevent measurement drift in grounded stainless steel piping?

A: The titanium pin provides a direct, corrosion-resistant electrical connection between the process fluid and the analyzer's reference shielding circuit. This arrangement shunts stray electrical currents away from the high-impedance Ag/AgCl reference junction, keeping the reference potential stable during severe ground potential offsets.

Q: What precautions must technicians observe regarding the Variopin connector during field installation?

A: Installers must verify that the Variopin connector remains completely dry and uncontaminated by process fluid or moisture during landing. Because the pH measuring circuit operates at extremely high electrical impedance (nominal 700 Mohm), any moisture or chemical residue inside the connector socket creates parallel resistance paths that severely degrade measurement accuracy.

Field Installation Guidelines

Mount the SC25V-ALP25-120 electrode into compatible 12 mm armored fittings or flow cells using standard thread engagement protocols. Inspect the Viton and EPDM backup O-rings prior to insertion to ensure tight sealing against process pressures up to 10 bar. Route the Variopin high-impedance signal cable through dedicated, shielded conduits away from high-voltage motor wiring or variable frequency drives to prevent electromagnetic noise pickup. Land the cable shield braid firmly at the designated analyzer earth terminal. When commissioning, remove the protective wetting cap and soak the glass bulb in standard pH calibration buffer solutions prior to executing two-point calibration routines.

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