HF scientific CLX Online Residual Chlorine Analyzer
CLX DPD chlorine/oxidant analyzer 0–10 mg/L; 4–20 mA + Modbus. RFQ + selection help.
RFQ cart holds BOM lines only. Submit for engineering quote.
Key parameters
DPD colorimetric online analyzer for free or total residual chlorine/oxidant with adjustable cycle time, 4–20 mA, and RS-485 Modbus.
Key advantages
- 0…10 mg/L range — optional extended range to 15 mg/L (±10%); resolution 0.01 mg/L (0.001 mg/L on some listings).
- USEPA-accepted DPD method — free or total chlorine/oxidant.
- Low reagent use — designed for unattended operation up to ~30 days (cycle-dependent).
- 4–20 mA + Modbus — bi-directional RS-485 Modbus or Modbus TCP; two programmable alarms.
Typical applications
- Drinking water, wastewater, industrial, and residual chlorine monitoring.
- Feed-pump control loops using analog or Modbus outputs.
- Installs needing a flow-through cuvette with viewable optical chamber.
Selection guide
- Range / accuracy — 0…10 mg/L; ±5% of reading or ±0.03 mg/L (whichever greater) for 0…6 mg/L; ±10% for 6…10 mg/L.
- Cycle time — User selectable ~60 s…10 min (manual notes 110 s…10 min / default 2.5 min — confirm revision).
- Outputs — Powered isolated 4–20 mA (600 Ω drive); RS-485 Modbus; two Form C alarms (120–240 VAC 2 A).
- Power — 100…240 VAC, 47…63 Hz (~80–150 VA by listing).
- Sample — Integral regulator ~5…150 psi; waste flow ~200…400 ml/min; sample temp 0…55 °C.
- Environment — Operating 0…40 °C; enclosure IP66 / NEMA 4X ABS; not recommended for outdoor use.
- Certifications — CE; UL/CSA (ETL) per OEM listings.
- Ordering example — Watts code 28002: CLX free or total, 100–240 VAC.
Common mistakes
- Specifying free vs total reagents incorrectly — method is selectable but reagents differ.
- Expecting 30-day unattended life at the shortest cycle times — life depends on cycle and reagent temperature.
- Outdoor mounting without weather protection — OEM says not recommended outdoors.
- Ignoring waste-stream plumbing for 200…400 ml/min.
- Analytical / water quality · Liquid analysis buying guide
When to RFQ / what to tell us
- Free vs total chlorine/oxidant; expected mg/L range (10 vs 15).
- Cycle-time target; analog/Modbus/alarm needs.
- Sample pressure/temperature; power region; quantity; ship-to.
Request a Quote · Get selection help
Specs
| Spec | Value |
|---|---|
| SKU | 191228 |
| Brand | HF scientific (Watts) |
| Model | CLX |
| Product type | online residual chlorine / oxidant analyzer |
| Measuring range | 0 to 10.00 mg/L (PPM); optional extended to 15 mg/L |
| Accuracy | ±5% of reading or ±0.03 mg/L (0–6 mg/L); ±10% (6–10 mg/L) |
| Output signal | Isolated 4–20 mA; RS-485 Modbus (Modbus TCP on some configs); 2 alarm relays |
| Supply voltage | 100–240 VAC, 47–63 Hz |
| IP rating | IP66 / NEMA 4X |
| Ambient temperature | 0 to 40 °C (32 to 104 °F) |
| Approvals | CE; ETL to UL/CSA 61010 |
| Weight | ~3.9 kg (8.6 lb) shipping; reagents separate |
| Notes | Specs from Watts/HF scientific CLX listings and OM-24420 manual. Reagents shipped separately. |
Documents
FAQ
Q: Free or total chlorine? A: CLX supports free or total via DPD reagents/configuration. State which in the RFQ.
Q: What outputs are standard? A: Isolated 4–20 mA and bi-directional RS-485 Modbus, plus two user alarms.
Q: What should I send for a quote? A: Free/total, range, cycle time, I/O needs, sample P/T, power, quantity. Compatible with systems using HF scientific CLX if you need a drop-in check — we do not claim authorized-dealer status.
Links
| Parameter | Value |
|---|---|
| Status | Specs pending OEM datasheet merge |