The Sato Sigma II NSII-Q continuously records temperature and relative humidity on an easy-to-read paper chart, providing a visible record without requiring a computer or network.
The Sato Sigma II NSII-Q is a traditional paper thermohygrograph for locations where staff need an immediate visual record of temperature and humidity. Two independent pens trace the changing conditions on a rotating cylindrical chart, making excursions and daily patterns easy to recognise during routine inspection.
Unlike an electronic data logger, the NSII-Q does not require software, a network connection or data downloading. It is well suited to facilities that require a straightforward local chart, provided that personnel replace and archive the paper and inspect the recorder regularly.
| Catalogue number | Temperature range | Humidity range | Recommended use |
|---|---|---|---|
| 7210-00 | −15 to +40 °C | 0 to 100 %RH, non-condensing | General rooms, laboratories, storage areas and cooler environments |
| 7211-00 | −10 to +50 °C | 0 to 100 %RH, non-condensing | Warmer production, storage and equipment areas requiring the extended upper range |
Before ordering: 7210-00 and 7211-00 require different chart papers because their printed temperature scales are different. Confirm the recorder catalogue number, temperature range and chosen rotation period before purchasing replacement charts.
| Specification | Sato Sigma II NSII-Q |
|---|---|
| Temperature accuracy | ±1 °C from +10 to +30 °C; ±2 °C elsewhere within the measurement range |
| Humidity accuracy | ±3 %RH from 20 to 95 %RH at +15 to +25 °C; ±5 %RH under other conditions within the range |
| Chart graduation | 1 °C and 1 %RH |
| Temperature sensing element | Aged bimetallic strip |
| Humidity sensing element | Human-hair bundle |
| Chart rotation | Selectable 1 day, 7 days or 32 days |
| Power | Two C-size batteries |
| Typical battery life | Approximately one year when operated continuously in 7-day mode |
| Dimensions | 336 W × 295 H × 148 D mm |
| Weight | Approximately 3.1 kg, excluding batteries |
| Chart period | Best suited to | Operating consideration |
|---|---|---|
| 1 day | Detailed observation during testing, troubleshooting or short production runs | Provides the widest time spacing but requires daily chart replacement |
| 7 days | Routine monitoring of rooms, warehouses and laboratories | A practical balance between chart detail and weekly maintenance |
| 32 days | Long-term condition trending where frequent access is inconvenient | Reduces chart changes but compresses events into a smaller time scale |
The chart speed must match the paper period. After changing the speed switch, fit the corresponding chart and mark its start date, start time, instrument identity and monitoring location.
| Recorder range | 1-day chart | 7-day chart | 32-day chart |
|---|---|---|---|
| 7210-00: −15 to +40 °C / 0 to 100 %RH | 7210-60 | 7210-62 | 7210-64 |
| 7211-00: −10 to +50 °C / 0 to 100 %RH | 7211-60 | 7211-62 | 7211-64 |
| Consumable | Reference | Selection guidance |
|---|---|---|
| Violet cartridge pen | 7210-90 / 7238-04 / 7238-02 | Confirm the current supply format and quantity when ordering |
| Red cartridge pen | 7210-92 / 7238-08 / 7238-06 | Confirm compatibility with the installed recording arm |
| Chart paper | Model- and period-specific | Match both the printed temperature range and 1-, 7- or 32-day rotation |
Consumable references may change with packaging or manufacturer revisions. When reordering, provide a photograph of the recorder nameplate, the existing chart number and the required recording period.
| Selection point | Sigma II chart recorder | Electronic data logger |
|---|---|---|
| Local visibility | Immediate graphical history visible through the cover | Normally requires a display, software or exported report |
| Infrastructure | No computer, network or external power required | May require software, interfaces, gateways or network access |
| Records | Physical paper charts filed manually | Electronic records with selectable reporting and storage |
| Alarms | No remote alarm function | Model-dependent visual, audible, email or SMS alarms |
| Data analysis | Visual review and manual interpretation | Searchable data, statistics, graphs and automated reports |
| Best fit | Simple local indication and independent paper recording | Multi-point monitoring, remote access, alarms or regulated electronic records |
For regulated monitoring: a paper thermohygrograph does not by itself provide user access control, audit trails, automated alarms or electronic-record controls. Confirm your quality-system and regulatory requirements before selecting it as the official monitoring record.
Inspect the chart drive, pen arms, cartridge pens, sensing elements, batteries and enclosure during routine maintenance. Replace weak batteries and dry or skipping pens before they cause gaps in the record. Dust should be removed carefully without bending the recording arms or damaging the humidity-sensing bundle.
Check temperature and humidity readings periodically against suitable references. Calibration frequency should reflect the required accuracy, operating environment, usage history and quality procedure. Record as-found results before making any mechanical adjustment.
Seacom Process Instruments supplies and supports the Sato Sigma II NSII-Q thermohygrograph in Malaysia for warehouses, laboratories, pharmaceutical facilities, production rooms, archives and other temperature- and humidity-sensitive locations.
Our team can help select between the 7210-00 and 7211-00 temperature ranges, confirm the appropriate chart period, identify replacement chart papers and pens, and advise whether a paper thermohygrograph or an electronic monitoring system better suits the application.
Contact Seacom with your expected temperature and humidity range, required recording period, monitoring location, documentation needs and existing recorder catalogue number so we can recommend the correct Sigma II model and consumables.
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Sato Thermohygrograph Catalogue
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