Microtox M500 calibration restored for a municipal water lab.
When calibration drift threatened a permitted lab's acute toxicity data, Rematek cleaned, recalibrated, and verified the Microtox Model 500 — returning it inside standard-method tolerance with documented results.
Authorized Modern Water service representative for 30+ years — Fallbrook, CA
At a glance
- Client Industry
- Municipal water / wastewater treatment
- Specific Instrument
- Microtox Model 500
- Service Provided
- Maintenance — calibration & repair
- Turnaround
- 5 business days, bench to ship
Calibration drift threatened compliant results
An NPDES-permitted laboratory reported widening variance in its acute toxicity screens. The Microtox M500 had developed calibration drift in the photometer path, pushing light-output readings outside method tolerance and putting the lab's ability to produce defensible Whole Effluent Toxicity data at risk ahead of a permit review.
- Calibration drift in the photometer / read-well optics
- Light-output readings outside ISO 11348-3 and ASTM D5660 tolerance
- Intermittent temperature-control fault affecting reagent stability
- Out-of-warranty unit no longer supported by the original channel
Precision restored, uptime protected
Rematek cleaned and recalibrated the full measurement path, replaced the failing temperature-control component, and ran performance verification against standard-method references. The analyzer was returned inside tolerance with documented results — restoring precision and keeping the lab's toxicity data audit-ready.
- ±2%
- Light-output repeatability after recalibration
- 100%
- Standard-method tolerance restored (ISO / ASTM)
- 5 days
- Bench-to-ship turnaround
- 0
- Repeat faults reported post-service
Work was performed by Rematek as an authorized Modern Water service representative — not a generic third-party repair shop — with 30+ years on the Microtox M500 and Deltatox analyzers. The instrument was returned with documented calibration and verification results, defensible for permit and audit review.
“Modern Water is pleased to announce it has appointed Rematek, LLC as an authorized service representative for its Microtox M500 and Deltatox acute toxicity analyzers.”
Rematek is a contract manufacturing specialist for environmental science technologies in Fallbrook, CA. Mark Woodward, the owner and operator of Rematek, has been an authorized service representative for over 30 years.
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