FirstRate FST100-PH104A pH Sensor, Range: 0-14pH, RS485 Modbus, 5m Cable, NPT3/4 Port, IP68
FirstRate FST100-PH104A pH Sensor, Range: 0-14pH, RS485 Modbus, 5m Cable, NPT3/4 Port, IP68 - Image 2
SKU: SENS-0342
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FirstRate FST100-PH104A pH Sensor, Range: 0-14pH, RS485 Modbus, 5m Cable, NPT3/4 Port, IP68

₹17,839.00 (Inclusive of all taxes)
Out of Stock

The FirstRate FST100-PH104A is an industrial-grade pH sensor with a 0-14pH measurement range, featuring an RS485 Modbus interface for seamless integration with PLCs, DCS, data loggers, and industrial controllers. It is designed for continuous submersion or inline installation with a 5m direct lead cable, NPT3/4 pressure port, and IP68 protection for harsh water quality monitoring environments.

Features

  • Industrial pH measurement range from 0 to 14pH with ±0.1pH accuracy.
  • RS485 Modbus/RTU output for direct PLC, DCS, and SCADA system integration.
  • IP68 submersible rating and POM housing for durable operation in water/wastewater.
  • Includes 5-meter direct lead cable and NPT3/4 threaded port for flexible mounting.
  • Dual high-impedance differential amplifier design for strong signal stability and fast response.

Out of stock

Description

The FST100-PH104A pH sensor employs a robust electrochemical sensing principle with a high-impedance glass electrode, designed for continuous online monitoring in demanding industrial and environmental applications. Its dual differential amplifier circuitry ensures precise signal conditioning with excellent immunity to electrical noise, providing stable and reliable pH readings even in fluctuating process conditions.

Housed in durable POM (polyoxymethylene) material and sealed to IP68 standards, the sensor is fully submersible and resistant to corrosion from acids, alkalis, and saline solutions. The integrated 3/4″ NPT threaded port facilitates secure installation directly into pipelines, tanks, or open bodies of water, while the 5-meter pre-attached cable simplifies field wiring and connection to control panels.

Key Features

  • High-precision pH sensing with 0.01pH resolution and ±0.1pH accuracy across the full 0-14pH range.
  • Universal RS485 interface supporting Modbus RTU protocol for industrial automation compatibility.
  • IP68-rated waterproof and dustproof construction for reliable submersion and harsh environment operation.
  • Durable POM sensor body and chemical-resistant electrode materials for long-term stability.
  • Integrated temperature compensation (0-60°C operating range) for accurate pH measurement across varying conditions.
  • Direct lead 5-meter cable with robust strain relief for simplified installation and maintenance.
  • 3/4" NPT threaded pressure port rated for up to 0.2MPa, enabling secure inline or tank mounting.
  • Dual high-impedance differential input amplifiers for superior noise rejection and fast response speed.

Applications

  • Continuous online pH monitoring in industrial wastewater treatment and effluent discharge control systems.
  • Water quality assessment in aquaculture, hydroponics, and surface water environmental monitoring stations.
  • Process control in chemical manufacturing, pharmaceutical production, and beverage processing.
  • Cooling tower and boiler feedwater treatment monitoring for corrosion prevention.
  • Municipal drinking water treatment and distribution network quality assurance.

Technical Specifications

Model NumberFST100-PH104A
Measurement Range0 - 14 pH
Accuracy±0.1 pH, ±0.3°C
Resolution0.01 pH
Output InterfaceRS485 (Modbus RTU Protocol)
Supply Voltage12V DC
Operating Temperature0°C to 60°C (65°C max per spec)
Pressure Rating< 0.2 MPa
Pressure PortNPT 3/4" Thread
Electrical ConnectionDirect Lead 5m Cable
Housing MaterialPOM (Polyoxymethylene)
Ingress ProtectionIP68
Dimensions (Shipping)33 x 15 x 10 cm
Weight (Shipping)0.535 kg

Frequently Asked Questions

What is the communication protocol for the FST100-PH104A pH sensor?

The sensor uses a standard RS485 serial interface running the Modbus RTU protocol. This allows for direct, daisy-chainable connection to industrial PLCs, SCADA systems, data loggers, or any controller with a Modbus master port. The wiring typically requires connecting the A+, B- data lines and providing a stable 12V DC power supply.

Can this pH sensor be fully submerged in water?

Yes, the FST100-PH104A is rated IP68, meaning it is completely dust-tight and can withstand continuous immersion in water under specified depth and pressure conditions (up to 0.2MPa). Its POM housing and sealed cable gland make it suitable for submersion in tanks, open water bodies, or pressurized pipelines.

What is the required power supply and how do I wire it?

The sensor requires a 12V DC power supply. Connection is made via the 5-meter direct lead cable, which includes separate wires for power (12V and GND) and the RS485 communication lines (A+ and B-). Always refer to the specific wiring diagram provided in the sensor's documentation for correct polarity and termination.

How do I install this sensor into a pipe or tank?

The sensor features a 3/4" NPT male thread on its pressure port. To install, you need a compatible 3/4" NPT female threaded fitting welded or glued into your tank wall or pipeline. The sensor can then be screwed directly into this port, ensuring a watertight seal for inline or submersion mounting.

Does the sensor require calibration and what is its accuracy?

Like all pH electrodes, periodic calibration using standard buffer solutions (e.g., pH 4.01, 7.00, 10.01) is required for maintaining optimal accuracy. The sensor has a stated accuracy of ±0.1pH and includes built-in temperature compensation to correct readings across its 0-60°C operating range.

Package Includes

  • 1 x FirstRate FST100-PH104A pH Sensor with 5m attached cable

Additional Information

Weight 0.535 kg
Dimensions 33 × 15 × 10 cm

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