Keep a paper record of room conditions with the Sato NSII-Q Sigma II thermohygrograph. Temperature and relative humidity are traced onto the same chart, allowing staff to review changes over time and retain the completed sheet with their inspection records.

The transparent cover keeps the chart visible during operation. A quartz clock drives the recording drum, while separate sensing elements respond to temperature and humidity. The instrument operates independently of a computer or network connection.

Choose the correct temperature range

The 7210-00 and 7211-00 share the same recording format but use different temperature scales. Select the model that covers the expected conditions at your measurement location.

Specification7210-007211-00
Series / model Sigma II / NSII-Q Sigma II / NSII-Q
Temperature range -15 to 40°C -10 to 50°C
Humidity range 0 to 100% RH, non-condensing 0 to 100% RH, non-condensing
Chart rotation 1, 7 or 32 days 1, 7 or 32 days
Minimum chart graduation 1°C / 1% RH 1°C / 1% RH

Recording periods to suit your review routine

  • 1-day recording: useful when reviewing changes within individual working days.
  • 7-day recording: supports a weekly chart replacement and review routine.
  • 32-day recording: provides a longer overview with fewer chart changes.

Match the chart paper to both the selected recording period and the instrument's temperature range. Changing the drum speed also requires the corresponding chart format.

Measurement and operating specifications

Temperature accuracy ±1°C from 10 to 30°C; ±2°C elsewhere within the measuring range
Humidity accuracy ±3% RH from 20 to 95% RH at 15 to 25°C; ±5% RH under other specified measuring conditions
Temperature sensor Bimetallic strip
Humidity sensor Human hair bundle
Recording pens Replaceable violet cartridge pens
Power supply Two C-size batteries
Battery life Approximately one year in 7-day rotation mode
Dimensions 336 (W) × 295 (H) × 148 (D) mm
Weight Approximately 3.1 kg, excluding batteries

Replacement chart paper and consumables

Select chart paper that matches your thermohygrograph's temperature range and recording period. All charts below include a 0 to 100% RH scale.

Part numberDescriptionTemperature rangePack quantity
7210-60 1-day chart for 7210-00 -15 to 40°C 400 sheets
7211-60 1-day chart for 7211-00 -10 to 50°C 400 sheets
7210-62 7-day chart for 7210-00 -15 to 40°C 55 sheets
7211-62 7-day chart for 7211-00 -10 to 50°C 55 sheets
7210-64 32-day chart for 7210-00 -15 to 40°C 55 sheets
7211-64 32-day chart for 7211-00 -10 to 50°C 55 sheets
7210-90 / 7238-04 / 7238-02 Spare cartridge pen, violet 12 pieces for 7238-02; confirm pack size for other references
7210-92 / 7238-08 / 7238-06 Spare cartridge pen, red 12 pieces for 7238-06; confirm pack size for other references
7238-22 Optional axial AC fan, 100–110 VAC Confirm when ordering

For replacement orders, provide the part number shown on your existing chart box or pen packaging so the correct supply can be confirmed.

7211-62 is the 7-day replacement chart for the 7211-00 instrument. It is a chart paper reference, not a thermohygrograph model number. The compatible violet cartridge pen is 7238-04.

Included accessories

Supplied with 55 sheets of 7-day chart paper, two C-size alkaline batteries and an instruction manual.

Contact us for pricing and availability. Specify 7210-00 or 7211-00, the quantity required and any additional chart paper or replacement pens.



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