Environmental Monitoring: THERMO-HYGROGRAPH SIGMA II Guide

Unnoticed temperature spikes and humidity shifts ruin sensitive raw materials, delicate electronic components, and laboratory samples quickly. Relying on spot-checks leaves critical operational blind spots during unmonitored night shifts and weekends. The THERMO-HYGROGRAPH solves this facility risk by recording ambient temperature and relative humidity continuously onto a rotating drum chart.

This guide explores how integrating a Sigma II thermo-hygrograph elevates environmental quality control.

What Is the THERMO-HYGROGRAPH SIGMA II?

The THERMO-HYGROGRAPH SIGMA II is a precision recording instrument manufactured by Sato Keiryoki for environmental monitoring.

Featuring an accurate quartz clock mechanism, this drum recorder tracks ambient climate fluctuations over 1-day, 7-day, or 32-day periods. Quality managers place this self-contained unit inside cleanrooms, storage vaults, and testing facilities to maintain uninterrupted physical compliance records.

Key Operational Advantages

Upgrading to a Sigma II thermo-hygrograph provides clear technical benefits for quality assurance managers:

• Dual-Pen Recording System: Uses twin cartridge pens to plot temperature and relative humidity lines simultaneously in contrasting colors.

• Selectable Recording Speeds: Quartz clock motor supports flexible 1-day, 7-day, or 32-day rotation cycles seamlessly.

• Human-Hair Bundle Sensor: High-purity human hair sensing element captures delicate relative humidity changes across wide ranges.

• Transparent Protective Casing: Clear acrylic housing lets technicians view live chart traces instantly without opening the unit.

Common Facility Applications

Facility engineers and quality officers rely on the Sigma II recorder for vital monitoring tasks:

1. Pharmaceutical Storage: Log temperature and humidity compliance inside medicine warehouses and chemical vaults continuous.

2. Museum and Archive Preservation: Protect delicate historical documents, artwork, and textiles against moisture damage.

3. Cleanroom Quality Control: Track atmospheric stability in semiconductor manufacturing and precision assembly zones.

4. Food Processing Facilities: Audit environmental storage conditions to prevent premature product spoilage.

How to Set Up in 4 Simple Steps

Follow these basic steps to initiate continuous environmental logging:

1. Mount Chart Paper: Wrap a fresh recording chart paper smoothly around the internal rotating drum.

2. Wind the Mechanism: Set the quartz clock switch to your target recording duration.

3. Prime Recording Pens: Remove protective pen caps and align pen tips gently against the chart grid line.

4. Close Protective Case: Secure the clear cover and place the unit on a level inspection shelf.

Final Thoughts

The THERMO-HYGROGRAPH SIGMA II turns continuous climate tracking into a simple, reliable routine. By generating permanent physical records, this dependable recorder protects valuable assets and maintains strict environmental standards.

Thermohygrograph Quartz type (-15 to 40°C, 0 to 100%RH) Quartz clock: 1 day, 7 day and 32 day changed by speed switch Battery: "C" size battery x 2 Battery Life: 1 year for continuous use