Dräger R-7540

Overview

The Dräger R-7540 Dissolved Oxygen Refill supplies sealed, single-use ampoules for ultra-trace DO (0–40 ppb) verification in high-purity waters. Paired with the C-7540 comparator and the standard CHEMets procedure, the reagent develops a stable pink/magenta color proportional to oxygen, enabling a direct ppb reading without photometers. R-7540 is ideal for power plants, refining & petrochemical, desalination make-up, and UPW loops, where controlling dissolved oxygen prevents corrosion and efficiency losses.

Key Features & Specifications

• Range: 0–40 ppb O₂ (ultra-trace)

• Chemistry: CHEMets® colorimetric, Rhodazine D™ sensitivity for low-level DO

• Use with: C-7540 comparator (visual ppb scale)

• Format: sealed, single-use ampoules; factory-standardized lots

• Typical sites: boiler feedwater, condensate, deaerator outlets, nitrogen-blanketed storage, UPW/process water

How It Works

Fill clean sample vial carefully (avoid aeration), snap and develop the R-7540 ampoule per kit timing, insert in the C-7540 comparator, rotate to the best color match, and read ppb O₂ directly. The sealed design minimizes air intrusion and handling error, supporting repeatable field results.

Applications

• Boiler chemistry programs: verify scavenger dosing (sulfite/DEHA) and DA performance

• Condensate monitoring: spot-check online analyzers with a quick visual confirmation

• UPW/process loops: daily rounds in power, chemical and pharma utilities

• Commissioning & troubleshooting: rapid checks during start-ups or after maintenance

Operating Tips (Quick)

• Rinse glassware with sample; fill from the bottom and cap immediately.

• Observe the specified development time for the lot.

• Read under consistent lighting; use a blank if color/ turbidity is present.

• Record ppb O₂, temperature, sampling point, lot number and operator.

Best Practices & QA

• Purge sampling lines to avoid stagnant water.

• Standardize procedure (same vial, timing, lighting) for trendable data.

• Store ampoules cool/dry; respect lot shelf life and safety guidance.

• For sub-10 ppb targets, tighten sampling discipline and verify with duplicates.

Compatibility & Ordering Notes

• R-7540 = refill ampoules only; order C-7540 comparator separately.

• Lot insert defines timing, corrections, and interferences—always follow the current insert.

• Accessory options: carry case, extra vials, SOP quick-card.

Why Seven Star LLC

We supply genuine consumables, help you size monthly usage by site, and include a one-page SOP tuned to your boiler/feedwater program so teams can achieve consistent, defensible ppb results.

FAQ

Q: What’s included in R-7540?

A: A refill pack of DO ampoules for the 0–40 ppb range. The C-7540 comparator and any accessories are ordered separately.

Q: Can I use R-7540 without the comparator?

A: Readability and repeatability rely on the C-7540 visual scale; we recommend using it for proper ppb resolution.

Q: How do I handle interferences?

A: Check the lot insert for temperature/humidity corrections and cross-sensitivities; use blanks/filters as specified.

Call to Action

Request a quote—Tell us your sampling points (BFW, condensate, DA outlet), expected ppb range, and monthly test volume. We’ll ship Dräger R-7540 refills with an SOP card and, if needed, the C-7540 comparator for complete deployment.