Industrial R-7540 Dissolved Oxygen Sensor Module

CHEMetrics R-7540 Dissolved Oxygen Refill is a 30‑ampoule package of self‑filling CHEMets ampoules designed to restore the dissolved oxygen testing capability for CHEMets K‑7540 (0–40 ppb) and K‑7599 (0–100 ppb) kits. Using the Rhodazine D method, each ampoule contains premeasured reagents that produce a color change in about two minutes, enabling DO quantification in water by comparison to a color standard. The refill supports two ranges—0–40 ppb with the K‑7540 kit and 0–100 ppb with the K‑7599 kit—and provides 30 tests per package. The ampoules are 7 mm in diameter and are designed to integrate with CHEMets visual DO testing workflows without requiring additional reagents beyond the kit. Safety data sheets and SDS documentation are available from the supplier for proper handling and disposal of the chemical reagents.