FTI26 Industrial Instrument Overview
FTI26 is a field instrument designed for industrial process control, commonly used for measurement and transmission of parameters such as flow, pressure, or temperature. Its design balances high precision and long-term stability, making it suitable for harsh environments in chemical, water treatment, energy, and other industries.
This manual aims to help engineering technicians and procurement personnel quickly understand the installation, wiring, parameter setting, and routine maintenance points of FTI26. The complete Chinese manual can be downloaded via the link below.
Download FTI26 Chinese Manual.pdf
FTI26 Core Technical Parameters
When selecting or replacing, pay close attention to the following key parameters. The table below lists typical technical specifications of FTI26; specific values are subject to the actual ordered model.
| Parameter Item | Typical Value/Range | Description |
|---|---|---|
| Supply Voltage | 24 VDC ±10% | Standard two-wire or four-wire |
| Output Signal | 4-20 mA / HART | Optional RS485 Modbus |
| Accuracy Class | ±0.2% FS | Full-scale error |
| Protection Rating | IP67 | Dustproof and waterproof |
| Ambient Temperature | -40~85 ℃ | -20~70 ℃ with LCD display |
| Process Connection | G1/2, NPT1/2, etc. | Flange optional |
FTI26 Installation and Wiring Guide
Installation Steps
- Confirm that the pipeline or vessel has been depressurized, and close the upstream and downstream valves.
- According to the process connection specification, wrap PTFE tape or use a gasket, and screw FTI26 into the installation point.
- Tighten with a wrench, avoiding excessive force that may damage threads or the housing.
- Adjust the instrument orientation to ensure the display is easy to observe and the cable entry faces downward.
Wiring Key Points
- Power Polarity: Connect strictly according to terminal markings; reverse connection may cause permanent damage.
- Shielding Layer: The cable shielding layer should be grounded at one end on the control cabinet side to reduce electromagnetic interference.
- Load Resistance: The total load of the 4-20 mA loop must be within the allowable range, typically ≤500 Ω.
- Explosion-proof Occasions: Must be used with a safety barrier and comply with intrinsically safe or flameproof specifications.
FTI26 Parameter Setting and Commissioning
FTI26 supports configuration via local buttons or HART communicator. Common settings include range upper and lower limits, damping time, output mode, and unit switching.
- Range Setting: Ensure the actual measurement range is within the sensor's rated range to avoid overload.
- Damping Adjustment: Increasing damping can smooth fluctuating readings but reduces response speed.
- Zero Calibration: Perform under no-flow/no-pressure conditions to eliminate the effects of installation stress.
- Fault Alarm: Output saturation or alarm current can be configured for easy identification by DCS.
After commissioning, it is recommended to record and back up the configuration parameters for future maintenance or replacement.
Common Troubleshooting and Maintenance
Troubleshooting Table
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| No output signal | Power reversed or open circuit | Check power supply and wiring polarity |
| Output constant above 20 mA | Sensor overload or fault | Check range and sensor status |
| Large reading fluctuation | Damping too low or interference | Increase damping, check shielding grounding |
| Display shows Err | Internal self-check failure | Power off and restart; if still abnormal, return to factory |
Routine Maintenance Recommendations
- Regularly check sealing performance to prevent medium leakage.
- Clean the housing and display, avoiding corrosive solvents.
- Perform zero calibration and loop test every 12 months.
- Check grounding and lightning protection measures before the thunderstorm season.
Selection and Procurement Precautions
When purchasing FTI26, please clarify the following information to ensure model matching:
- Measurement Type: Pressure, differential pressure, flow, or temperature.
- Process Connection: Thread specification or flange standard.
- Output Signal: 4-20 mA, HART, or RS485.
- Explosion-proof Rating: Intrinsically safe, flameproof, or non-explosion-proof.
- Display and Housing: Whether LCD display is required, material requirements.
It is recommended to purchase from authorized distributors or the original manufacturer, and obtain calibration certificates and warranty documents. For the complete manual, please download the PDF.