Foxboro 871A-2F-1 pH/ORP Sensor – Product Description

Description / Overview

The Foxboro 871A-2F-1 is a high-precision pH and ORP sensor from the 871A Series, designed for continuous process monitoring in demanding industrial environments. It provides reliable measurements in chemical, water treatment, pulp & paper, and power generation applications. Moreover, its integral preamplifier ensures stable signal transmission even over long cable runs. The rugged housing and double-junction reference electrode extend operational life while maintaining accurate readings under harsh conditions.

Technical Data / Specifications

• Model: 871A-2F-1

• Type: pH/ORP Electrochemical Sensor

• Measuring Electrode: Flat glass pH electrode

• Reference Electrode: Double-junction, gel-filled

• Output: Analog via integral preamplifier

• Process Connection: 1-inch NPT thread (standard)

• Cable Connection: No. 6 spade lugs; optional integral cable

• Operating Range (pH): 0–14 pH

• Operating Range (ORP): –2000 to +2000 mV

• Temperature Range: –5 °C to +105 °C

• Pressure Range: Up to 100 psig (690 kPa)

• Accuracy: ±0.1 pH units typical

• Materials: Rugged industrial housing, chemical-resistant

• Certifications: CE marked, conforms to EU directives

• Application Areas: Chemical processing, water treatment, pulp & paper, power generation

FAQ

Q1: What pH range does the 871A-2F-1 sensor cover?
A1: It operates over a pH range of 0 to 14.

Q2: Can it measure ORP as well as pH?
A2: Yes, it measures ORP from –2000 to +2000 mV.

Q3: Does it have a preamplifier for signal stability?
A3: Yes, the integral preamplifier ensures stable analog output.

Q4: Which industries typically use this sensor?
A4: Chemical processing, water treatment, pulp & paper, and power generation.

Q5: What type of electrode does it use?
A5: A flat glass pH electrode with a double-junction reference.