GF Signet P51530-P1 Industrial pH/ORP Sensor

The GF Signet P51530-P1 is a rugged, industrial-grade in-line pH/ORP (oxidation-reduction potential) sensor designed for demanding process applications. Part of GF Signet's P515 series, this sensor is renowned for its robust construction and user-friendly maintenance, making it a preferred choice for continuous process monitoring and control in industries such as water treatment, chemical processing, pharmaceuticals, food and beverage, and power generation.

Key Features & Specifications

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• Model Identification: P51530-P1

• P515: Series designation, indicating membership in the P515 family.

• 30: Connection and process-interface code. Typically, "30" signifies that the sensor features a Signet proprietary 3/4" NPT threaded mounting bracket, facilitating easy installation and retraction from the process for maintenance.

• -P1: Critical suffix. This denotes that the sensor is equipped with a "Pressurized, Refillable" reference electrolyte system. This is its core feature, specifically engineered for harsh applications where standard reference systems are prone to fouling or rapid depletion.

• Primary Features:

• Body Material: Typically made of Ryton® (PPS) plastic, offering excellent chemical resistance and high-temperature tolerance (up to 80°C / 176°F).

• Electrode Guard: Protects the sensitive glass electrode from mechanical damage.

• This is its most significant advantage. The sensor incorporates a pressurized electrolyte reservoir, allowing users to apply slight positive pressure to the reference system via a filling port (typically using a manual or automatic pressurization tool).

• Benefit: This design effectively prevents process liquid from infiltrating the reference electrode, thereby significantly extending sensor life and stability in applications containing solids, oils, proteins, or scaling-prone liquids. It solves the common problem of rapid drift and contamination seen in standard diffusion-type reference electrodes.

• Pressurized, Refillable Reference System (-P1):

• pH Glass Electrode: Utilizes a high-performance pH-sensitive glass membrane for fast and accurate pH response.

• ORP Capability: Can be configured to measure Oxidation-Reduction Potential by installing the appropriate measuring electrode (typically a gold or platinum ring electrode).

• Integrated Temperature Sensor (Pt1000): Features a built-in Pt1000 RTD temperature probe for Automatic Temperature Compensation (ATC), ensuring accurate pH/ORP readings across varying process temperatures.

• Rugged Construction:

• Maintenance-Friendly: The refillable electrolyte system allows users to easily replenish KCl electrolyte and clean or replace key components (e.g., glass electrode, reference electrode, junction) on-site without replacing the entire sensor, reducing long-term ownership costs.

• Electrical Connection: The sensor termination typically includes an integrated, fixed-length shielded cable for direct connection to compatible GF Signet dedicated transmitters (e.g., 2850 series, 8900 multi-parameter transmitters).

• Typical Applications:

• Wastewater treatment (influent, aeration basins, effluent)

• Chemical process streams

• Cooling tower water monitoring

• Pulp and paper processing

• Food & beverage processing (e.g., dairy, brewing)

• Any "dirty" or high-ionic-strength solution that could foul a standard reference electrode.

Summary

The GF Signet P51530-P1 is a professional-grade, highly reliable in-line pH/ORP sensor. Its core value lies in the -P1 suffix, which signifies the Pressurized, Refillable Reference System. This feature makes it the preferred solution for challenging, fouling-prone process liquids. By proactively defending against reference contamination, it dramatically improves measurement stability, accuracy, and overall sensor service life. It is particularly well-suited for industrial continuous monitoring applications requiring low maintenance and high reliability.