Georg Fischer - pH Probe - For Growlink NDS/NDK

Brand: Georg Fischer

Georg Fischer - pH Probe - For Growlink NDS/NDK

Two-part assembly: Signet 2724 DryLoc flat tip electrode plus Signet 2751 smart sensor electronics. Sold together.

This is the complete pH probe assembly used in the Growlink Nutrient Delivery System and Nutrient Delivery Kit, supplied as two Georg Fischer part numbers that are functionally useless apart. The 3-2724-00 is the wetted sensing element - a glass membrane electrode with an integral Pt1000 temperature element and patented dual reference, terminating in the gold contact DryLoc quick connect. The 3-2751-2 is the transmitter that buffers and digitizes that signal, applies temperature compensation and outputs 4-20 mA or digital S3L. GF states in both datasheets that each requires the other to operate.

The electrode threads in by its 3/4 in. MNPT connection at the skid sensor assembly, downstream of the injection point and mixing chamber so it reads blended solution rather than raw stock. Growlink specifies two pH sensors for redundancy, since pH probes fail and correct pH at the plant matters. The 2751 electronics mount directly onto the electrode via DryLoc, forming a compact in-line assembly, and wire back to the Nutrient Expansion Module. The -2 configuration adds a junction box and EasyCal push-button calibration with LED feedback, no handheld required. Growlink recommends recalibration every three to six months against pH 4.01, 7.00 and 10.00 buffers.

Key Features

• Range -1.00 to 15.00 pH at the electronics, 0 to 14 pH at the electrode
• Accuracy plus or minus 0.02 pH at 25 C
• Output 4-20 mA, plus digital S3L serial at 9600 bps
• Flat tip self-cleaning geometry suited to fouling-prone and particulate-laden fluids
• Integral Pt1000 temperature element with patented dual reference, 406 mm pathway
• Process connection 3/4 in. MNPT
• Wetted materials PPS, glass, UHMW PE and FKM; porous UHMW PE junction
• Electrode max pressure 6.8 bar at 0 to 65 C, 4 bar at 65 to 85 C
• Electrode operating -10 C to 85 C (14 F to 185 F)
• Power 12 to 24 VDC regulated in 4-20 mA mode
• Cable 4.6 m (15 ft) shielded standard, extendable to 305 m (1000 ft)
• NEMA 4X / IP65 with electrode connected
• EasyCal push-button calibration with LED feedback
• CE, RoHS and FCC Part 15 DoC; made under ISO 9001, 14001 and 45001
• Electrode is damaged by storage below 0 C and must be kept wet

Ideal Applications

• pH control on nutrient delivery and fertigation skids
• Redundant pH sensing where a single probe failure is unacceptable
• Water treatment and pH neutralization loops
• Process fluids with suspended solids where a flat self-cleaning tip helps