Key Product Highlights — Truflo TKW
1) “Blind” Simplicity with LED Indication
- Blind unit design for applications that don’t require a numeric display
- Bright LED indicator for quick visual confirmation/status
- Pre-programmed for fast installation with no programming required
2) Flexible Outputs: Pulse, 4–20 mA, and Voltage
- Supports NPN pulse output for flow signaling/totalization
- Supports 4–20 mA output for PLC/DCS analog flow input
- Supports voltage output (e.g., 0–5 V options) depending on configuration
- Options include 4–20 mA + pulse wiring via M12 (where equipped)
3) High-Accuracy Sensing with Wide Operating Range
- ±0.5% of full-scale linearity and ±0.5% repeatability @ 25°C (77°F)
- Wide operating velocity range: 1–33 ft/s (0.3–10 m/s)
- Suitable for full-pipe liquid flow measurement
4) ShearPro® Paddle Wheel Durability and Wear Resistance
- Contoured ShearPro® profile reduces turbulence and increases longevity
- ETFE (Tefzel®) paddle wheel provides strong chemical and wear resistance
- Zirconium ceramic rotor pin/bushings (ZrO2) provide high wear resistance and reduced fatigue stress
5) Corrosion-Resistant Construction for Harsh Environments
- Body material options: PVC (dark), PP (pigmented), PVDF (natural), and 316 SS
- NEMA 4X / IP66 environmental protection with low pressure drop
- True-union design (½”–2″) and flanged versions (3″–4″) for service-friendly installation
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Type | In-line paddle wheel flow meter sensor (blind) with LED indicator |
| Operating Range | 1–33 ft/s (0.3–10 m/s) |
| Pipe Size Range | ¼”–4″ (¼”–¾” SS only) |
| Linearity (Accuracy) | ±0.5% of full scale @ 25°C (77°F) |
| Repeatability | ±0.5% of full scale @ 25°C (77°F) |
| Wetted Body Materials | PVC, PP, PVDF, 316 SS |
| Seal Materials | FKM (standard), EPDM (optional), FFKM/Kalrez® (optional) |
| Rotor Pin / Bushings | Zirconium ceramic (ZrO2) |
| Paddle / Rotor | ETFE (Tefzel®), ShearPro® contoured design |
| Outputs | NPN pulse, voltage, 4–20 mA (model dependent) |
| Frequency (nominal) | 49 Hz per m/s; 15 Hz per ft/s |
| Supply Voltage | 9–30 VDC ±10% regulated |
| Supply Current | <1.5 mA @ 3.3–6 VDC; <20 mA @ 6–24 VDC |
| Enclosure Rating | NEMA 4X / IP66 |
| Local Indication | Blind with LED indicator (no numeric display) |
| Pressure/Temperature (Non-Shock) | PVC: 180 psi @ 68°F; 40 psi @ 140°F. PP: 180 psi @ 68°F; 40 psi @ 190°F. PVDF: 200 psi @ 68°F; 40 psi @ 240°F. 316 SS: 200 psi @ 180°F; 40 psi @ 300°F. |
| Operating Temperature | PVC: 32–140°F (0–60°C); PP: -4–190°F (-20–88°C); PVDF: -40–240°F (-40–115°C); 316 SS: -40–300°F (-40–148°C) |
| Standards & Approvals | UL, NSF, CE, RoHS compliant |
| Notes | K-factor is pre-programmed; M12 wiring/output options available on select units |
Suitable Applications — Truflo TKW
The TKW | TK3W Series is ideal for installations where a local numeric display is unnecessary, but reliable flow sensing and robust signal outputs are required for automation and monitoring. Its rugged enclosure, chemical-resistant materials, and multiple output options make it a strong fit for skid systems and industrial environments.
- PLC/DCS flow monitoring using 4–20 mA or voltage output
- Flow/no-flow verification and permissive logic using pulse output
- Chemical dosing and metering skids where remote indication is preferred
- Water and wastewater treatment systems requiring rugged sensors (IP66/NEMA 4X)
- Corrosive chemical transfer and recirculation lines
- OEM equipment needing a pre-programmed, “blind” sensor with configurable outputs
- Installations where panel/HMI provides the primary display and local numeric readout is not required