Walchem WEL Series pH and ORP Electrodes
Walchem WEL Series pH and ORP Electrodes
The Walchem WEL Series are cost-effective differential pH and ORP electrodes engineered for industrial water-treatment applications. A modular CPVC housing contains all of the electronics, and pH or ORP cartridges connect through a threaded interlock with a double O-ring seal — replacing a cartridge takes minutes with no tools and no need to discard the electronics.
An integral titanium solution ground rod enables differential measurement, delivering prolonged electrode life, stable readings, and resistance to stray voltages and ground-loop interference. Cable runs reach up to 4,000 ft (1,219 m) at 24 VDC, response is better than 90% in under 5 seconds, and a built-in preamplifier or 4-20 mA transmitter feeds Walchem Intuition and WebMaster controllers.
- Features & Benefits
- Applications
- Product manuals
- Product specs
- Differential measurement — integral titanium ground rod for stable readings even with stray voltages or ground-loop interference
- Modular CPVC housing — electronics stay in the housing when the cartridge is replaced, lowering long-term cost
- Tool-free cartridge swap — threaded interlock + double O-ring seal; replace pH or ORP cartridges in minutes
- Built-in preamplifier or 4-20 mA transmitter — direct signal into Walchem Intuition / W100 / W600 / W900 / WebMaster controllers
- Long cable runs — up to 4,000 ft (1,219 m) at 24 VDC, 24 AWG
- Fast response — better than 90% in under 5 seconds
- Wide measurement range — 0–14 pH or ±2,000 mV ORP; 0–100 °C; 0–100 psi
- Industrial water-treatment systems requiring continuous pH and ORP measurement
- Process loops where ground-loop interference or stray voltage compromises conventional electrodes
- Applications calling for long cable runs to remote sensor locations
| Measurement Range | 0 to 14 pH; -500 to 2000 mV |
|---|---|
| Wetted Materials | Cartridge & housing: CPVC; reference junction: HDPE; O-rings: FKM; ground rod: titanium; electrode: glass (pH) or platinum (ORP); inline fittings: glass-filled reinforced polypropylene |
| Junction | Double junction |
| Temperature Range | 32 to 158 °F (0 to 70 °C); up to 32 to 212 °F (0 to 100 °C) on specific models |
| Max Pressure | 100 psi (6.9 bar) |
| Mounting | Submersion (1" NPTM); in-line (3/4" NPTF tee); others |
| Temperature Compensation | Pt1000 RTD |
| Max Cable Length | 1000 ft (305 m) |
| Recommended Flow | 10 ft/s (3 m/s) |
More from Walchem
Not sure where to start?
Get in touch with one of our liquid processing experts today.