PVDF Conductivity Electrode for the Growlink Nutrient Doser System
The 2841 electrode pairs a PVDF insulator with 316 SS contacts and FKM internal O-rings. The wetted side handles standard hydroponic feeds without crazing. The 1.0 cell constant covers 10 to 10,000 µS — the band where fertigation EC actually sits. The 3/4 in NPT thread drops into any inline tee or submersion saddle. A 15-foot factory cable connects the electrode to the 2850 electronics. Up to 1,000 feet of cable runs between the electronics and the receiving controller.
GF Signet 2850 Conductivity Sensor Electronics with EasyCal
The 2850 is a two-wire transmitter that reports EC on a 4-20 mA loop. Eight pre-set ranges key to each cell constant — pick the band that matches your recipe and the loop scales automatically. EasyCal auto-recognizes a standard calibration solution within ±10% of its known value. A routine calibration takes a beaker of solution and a button press. The NEMA 4X / IP65 enclosure ignores wash-down and humidity. The 4-20 mA output lands on a Growlink Nutrient Doser, Connect Controller, or any PLC that reads a standard loop.
Key Features
- 2841 PVDF electrode, 1.0 cell constant: 316 SS contacts and FKM O-rings handle 10 to 10,000 µS — the band fertigation actually lives in.
- 3/4 in NPT process connection: Threads into any standard inline tee or submersion saddle without an adapter.
- 4-20 mA two-wire output: Eight pre-set ranges per cell constant scale the loop to the recipe band.
- EasyCal auto-recognition: Beaker calibration with any standard solution within ±10% of the known value, no menu diving.
- NEMA 4X / IP65 enclosure: Sealed against wash-down and humid grow-room air on a wall or a mechanical-room shelf.
- Up to 1,000 ft electronics-to-controller cable run: Place the head where the line lives and the loop where the PLC can see it.
- Specified for Growlink NDS and NDK dosing systems: Drop-in EC sensor for the Nutrient Doser System and Nutrient Doser Kit.
Technical Specifications
| Specification | Value |
|---|---|
| Sensor electronics | GF Signet 2850 with EasyCal |
| Output | 4-20 mA, two-wire (eight pre-set ranges per cell) |
| Included electrode | GF Signet 2841 (1.0 cell constant) |
| Electrode insulator | PVDF |
| Electrode contacts | 316 SS |
| Internal O-rings | FKM (Viton) |
| Process connection | 3/4 in NPT |
| Operating range (1.0 cell) | 10 to 10,000 µS / 5 to 5,000 ppm |
| Electronics range (across cells) | 0.055 µS to 400,000 µS |
| Max P/T (electrode) | 40 psi @ 268°F |
| Enclosure | NEMA 4X / IP65 |
| Electrode cable | 15 ft / 4.6 m standard |
| Electronics-to-controller cable | Up to 1,000 ft / 305 m |
| Calibration | EasyCal auto-recognition (±10% of standard solution) |
| Compatibility | Growlink Nutrient Doser System (NDS), Nutrient Doser Kit (NDK), Connect Controller, generic 4-20 mA PLC |