What is the measuring range of FMR-80 radar level meter?

FMR-80 supports 0.3~80m full range non-contact water level measurement, fit for large reservoirs and wide rivers.

Can FMR-80 work in heavy rain or dust environment?

Yes, it adopts full IP68 waterproof and dustproof housing, stable operation under harsh outdoor conditions.

What signal interfaces does FMR-80 support?

It provides standard 4-20mA analog signal and RS485 Modbus RTU digital communication for docking industrial RTUs.

FWater Quality pH Sensor

Product Overview

The F-IWQ1501 is an industrial online water quality pH sensor developed by FourFaith (Xiamen). Adopting the glass electrode method for measurement, it is equipped with Pt1000 automatic temperature compensation and can simultaneously acquire water pH value and water temperature.

It is suitable for environmental water quality monitoring, acid, alkali and salt solutions, as well as on-line acidity & alkalinity detection in chemical production reaction processes.

Compatible with various industrial control equipment including PLC, DCS, industrial computers and HMI touch screens, it outputs standard RS485 Modbus RTU digital signals to meet the requirements of long-term online industrial monitoring.

Advantages & Features

✅️ OBuilt-in dual high-impedance differential amplifier featuring strong anti-interference performance and fast measurement response.

✅️ APatented long-life reference electrode enables stable electrolyte outflow for over 20 months, greatly extending electrode service life.

✅️ F3/4 NPT standard thread, supporting multiple mounting methods: submersible, side-wall, in-pipe and top flange installation.

✅️ RIP68 high-protection ABS/PC alloy housing, allowing long-term submerged underwater operation.

✅️ DOutputs standard Modbus RTU protocol, compatible with most industrial automation acquisition devices./

✅️ RIntegrated Pt1000 automatic temperature compensation eliminates temperature interference on pH measurement accuracy.

✅️ DLow-power design; total power consumption is only 0.2W under 12V power supply, ideal for solar-powered field monitoring stations.

Technical Specifications

Protection Class	IP68	Operating temperature	-0~50°C
pH Range	0 ~ 14.00	pH Resolution	0.01
pH Accuracy	±0.1	Velocity Accuracy	±0.01m/s
Power supply	DC 12~24V	Storage Temperature	-5 ~ 65°C

Q1:Is there a mandatory installation angle requirement for the sensor? What problems will occur if it is not inclined?

A: It must be installed at an inclination of more than 15°. Horizontal or inverted mounting prevents the internal reference electrolyte from seeping out normally, resulting in measurement drift and rapid electrode failure.

Q2: How to deal with drifting readings and excessive measurement error?

A: First, rinse the probe with pure water. Perform two-point calibration using 4.00/6.86/9.18 buffer solutions. Check wiring and waterproof seals, and keep away from strong electromagnetic interference. If scale builds up on the glass membrane, clean it with dilute hydrochloric acid.

Q3: How to modify the Modbus address and communication baud rate of the sensor?

A: Use Modbus Function Code 06 write command to operate register 48195 (address) and register 48196 (baud rate). Changes take effect immediately after command transmission. Default address: 3; default baud rate: 9600.

Water Quality pH Sensor