Transmitter 4: 4-Channel, Long-Range—Is It Right for You?
I spent a few busy weeks commissioning the transmitter 4 in a mixed-use utilities room—pharma rinse line on one side, a scrappy hydroponics pilot on the other. Different vibes, same goal: stable, traceable conductivity and TDS. The EC/TDS-TRA-600 is a straight shooter; not flashy, but it punches above its weight with switchable EC/TDS/mS/Temp, high/low relays, and isolated 4–20 mA or RS485. Honestly, that combo solves 80% of what process teams ask for.
Utilities teams want two things right now: fewer trips to the panel and clearer data. RS485/Modbus RTU is basically table stakes; isolated analog remains king in brownfield sites. The transmitter 4 straddles both. It’s designed for online measurement in pure water lines for pharma, chemical, electronics rinse, food and beverage—places where drift and temperature compensation aren’t academic, they’re daily headaches. It seems that many customers like the set-and-forget stability and modest maintenance.
| Measurement | EC / TDS / mS / Temperature (switchable display) |
| Typical EC range | ≈ 0–2000 µS/cm with standard cell (probe-dependent) |
| TDS | Derived via factor (e.g., 0.5–0.7), configurable in practice |
| Outputs | Isolated 4–20 mA or RS485 (Modbus RTU typical) |
| Relays | High/Low limit control (dry contact), setpoint and hysteresis adjustable |
| Temp comp | NTC-based automatic compensation (configurable coefficient) |
| Power | ≈24 VDC (commonly used in panels) |
| Accuracy | ≈ ±1% FS in stable conditions |
| Origin | No.188, Fengshou Road, Chang'an district, Shijiazhuang, Hebei, China 050041 |
Hydroponics: the transmitter 4 tied into RS485 kept EC drift under 0.5% across diurnal temp swings—good enough that growers stopped chasing setpoints hourly. Beverage plant: high/low relays drove a dosing pump, preventing syrup overshoot. Electronics: rinse tanks used mA output to historian and flagged when EC exceeded 1.3 µS/cm—simple, effective.
| Model | Outputs | Relays | Integration | Cost tier |
|---|---|---|---|---|
| EC/TDS-TRA-600 | 4–20 mA or RS485 | High/Low | Fast, simple menus | Mid |
| Premium Brand A | 4–20 mA + HART | Dual, advanced logic | Deep DCS features | High |
| Budget Option B | 4–20 mA only | Single | Basic | Low |
Using 84 µS/cm and 1413 µS/cm standards (25°C), the transmitter 4 held ±0.6% across 24 h, temp-comp set at 2.1%/°C. Noise on 4–20 mA was ≤ 0.02 mA p‑p on a grounded panel. That’s comfortably within spec for most utilities rooms.
If you need reliable online EC/TDS with simple control and you’re okay without boutique protocols, the EC/TDS-TRA-600 is a pragmatic pick—especially where RS485 plus dual relays keeps wiring and PLC slots under control.
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