Key Product Highlights — Truflo TK3S (316 SS) Pulse + Relay Flow Meter Sensor
1) 316 Stainless Steel Body for Harsh Process Conditions
- 316 SS sensor body supports demanding industrial environments and robust mechanical durability
- Compatible with corrosive service when paired with appropriate seal selection (FKM standard; EPDM/FFKM optional)
2) Pulse + 1 Amp Relay Outputs for Control and Interlocks
- NPN pulse output for flow-rate signaling (and PLC/RTU totalization if required)
- 1 Amp relay (COM/NO) output for alarms, permissives, pump protection, or flow/no-flow interlocks
3) Wide Operating Range with High Repeatability
- Operating range: 1–33 ft/s (0.3–10 m/s)
- ±0.5% F.S. linearity and ±0.5% F.S. repeatability @ 25°C (77°F)
- Intended for full-pipe liquid flow measurement
4) ShearPro® Rotor Design for Long-Life Measurement Stability
- Contoured ShearPro® profile reduces turbulence and drag for increased longevity
- ETFE (Tefzel®) paddle wheel plus zirconium ceramic rotor supports high wear resistance
5) Field-Ready Protection and Simple Local Indication
- IP66 / NEMA 4X protection for washdown/outdoor/industrial areas
- Bright LED flow display with 360° rotation for flexible mounting orientation
- Lifetime warranty on the paddle wheel assembly (per product statement)
Technical Specifications
| Parameter | Specification |
|---|---|
| Operating Velocity Range | 1–33 ft/s (0.3–10 m/s) |
| Pipe Size Range | ¼”–4″ (note: ¼”–¾” sizes are SS-only per datasheet note) |
| Linearity | ±0.5% of full scale @ 25°C (77°F) |
| Repeatability | ±0.5% of full scale @ 25°C (77°F) |
| Wetted Body Material | 316 stainless steel |
| O-Rings | FKM (standard); EPDM (optional); FFKM (optional) |
| Rotor Pin / Bushings | Zirconium ceramic (ZrO2) |
| Paddle / Rotor | ETFE (Tefzel®), ShearPro® contoured design |
| Outputs | NPN pulse + 1 Amp relay |
| Supply Voltage | 9–30 VDC ±10% regulated (wiring table indicates +10–30 VDC) |
| Frequency (nominal) | 49 Hz per m/s; 15 Hz per ft/s |
| Local Indication | LED flow-rate display |
| Enclosure Rating | NEMA 4X / IP66 |
| 316 SS Pressure/Temperature (Non-Shock) | 200 psi @ 180°F; 40 psi @ 300°F (14 bar @ 82°C; 2.7 bar @ 148°C) |
| 316 SS Operating Temperature | -40°F to 300°F (-40°C to 148°C) |
| Approvals | UL, NSF, CE, RoHS compliant |
Suitable Applications — Truflo TK3S Pulse + Relay (316 SS)
The TK3S is a strong fit when you need local flow-rate indication plus pulse and relay outputs for dependable automation logic in industrial environments—especially where 316 stainless steel construction is preferred for durability and process compatibility.
- Pump protection (flow/no-flow permissive and shutdown) using the 1 Amp relay
- Flow verification on critical utility and process lines (confirming circulation/transfer)
- Alarm or setpoint-style control logic (relay output to signal abnormal conditions)
- PLC/SCADA flow monitoring via NPN pulse input (and software-based totalization if needed)
- Industrial washdown/outdoor installations requiring IP66 / NEMA 4X protection
- Chemical transfer and distribution systems favoring 316 SS wetted construction
- OEM skid systems needing a rugged, pre-programmed sensor with simple wiring and outputs