Redpost single-channel PU monitor RPU-120+: control and QA notes for mine engineers
Reviewed by Joe Ashwell

First reported on Australian Mining
30 Second Briefing
Redpost has launched the RPU-120+ single-channel polyurethane (PU) monitor, a special-purpose electronic temperature recorder covering the same temperature range as the previous RPU-120 but with higher accuracy and longer logging duration. Using the same third-generation sensing and electronics platform as the RPU-352, the unit targets “industry-leading” temperature accuracy for PU injection and curing control in mining and tunnelling applications. The device retains Redpost’s rugged construction, aimed at reliable performance in harsh underground environments where precise thermal profiling governs grout behaviour and quality assurance.
Technical Brief
- Single-channel configuration focuses measurement on one critical PU injection line or curing location.
- Third-generation sensing platform shared with the RPU-352 simplifies fleet calibration and maintenance procedures.
- Ruggedised housing targets harsh underground headings where vibration, moisture and dust compromise conventional loggers.
- Extended logging duration enables full thermal profiles over long-shift or multi-stage PU injection campaigns.
- Higher temperature resolution supports tighter acceptance bands in PU quality-control and curing verification.
- Dedicated PU temperature monitoring reduces reliance on manual thermometer checks, cutting operator exposure time.
- Electronic logging provides auditable temperature records to support site safety management systems and incident reviews.
- Similar single-purpose loggers are likely to be adopted for other critical grout and resin systems.
Our Take
Safety-tagged product pieces in our database for Australia often cluster around gas detection and ventilation controls, so a single-channel PU monitor from AMS/Redpost likely targets incremental upgrades to existing underground monitoring rather than full-system replacements.
AMS appearing in a Product/Safety context aligns with a pattern in our coverage where Australian suppliers focus on modular, easily retrofittable devices, which can be rolled out quickly across multiple mines without major shutdowns.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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