Batch Type Concrete Mixer Calibration(IS 1791 — Drum Speed & Timing)
Calibration of batch-type concrete mixers — drum speed, mixing timer and mechanical condition verified against IS 1791 so trial mixes and lab batches replicate field behaviour.
What is Batch Type Concrete Mixer Calibration?
Lab trial mixes only predict site concrete if the lab mixer behaves like a compliant machine. IS 1791:1985 (Batch Type Concrete Mixers — Specification) defines drum speeds and performance expectations; drive wear and control drift change real drum RPM and mixing energy, shifting workability and strength of otherwise identical batches.
Global Lab measures true drum speed with traceable non-contact tachometers, verifies mixing timers against reference chronometers, inspects blade wear and drum condition, and certifies against IS 1791 with as-found values — keeping mix-design programmes honest.
How the Batch Type Concrete Mixer Calibration is Conducted
- 1
Mechanical Inspection
Blade wear, drum condition and drive behaviour are inspected as-found. - 2
Drum Speed Measurement
True drum RPM is measured with a traceable tachometer at operating settings. - 3
Timer Verification
Mixing timers are checked against a reference chronometer. - 4
Evaluation
Results are evaluated against IS 1791 requirements. - 5
Certification
As-found data and verdicts are issued via Autovity QLMS.
Applicable Test Standards
| Standard | Title | Scope | Type |
|---|---|---|---|
| IS 1791:1985 | Batch Type Concrete Mixers — Specification (Reaffirmed) | Mixer Requirements | Indian Standard |
| ISO/IEC 17025:2017 | Competence of Testing and Calibration Laboratories | Calibration System | International |