Follow changes in atmospheric pressure with the Sato NSII-BQ Sigma II barograph, catalogue number 7237-00. The instrument draws a continuous pressure trace on paper, allowing you to review when pressure rose, fell or remained steady during the recording period.
Choose this atmospheric pressure recorder when your observation routine calls for a visible chart and a physical record that can be dated, annotated and filed. The transparent cover allows the chart to be inspected during operation.
Atmospheric pressure recording on paper
An aneroid bellows responds to changes in air pressure and transfers that movement to a cartridge pen. A battery-powered quartz mechanism rotates the chart cylinder, creating a record of pressure against time.
The NSII-BQ records atmospheric pressure. For pipework pressure or the pressure difference between two rooms, select an instrument designed for that measurement.
Measurement and operating specifications
| Item | Specification |
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| Manufacturer |
Sato |
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| Product / model |
Sigma II Barograph / NSII-BQ |
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| Catalogue number |
7237-00 |
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| Measured parameter |
Atmospheric pressure |
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| Measuring range |
940–1045 hPa |
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| Accuracy |
±1 hPa from 950 to 1040 hPa; ±2 hPa elsewhere within the measuring range |
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| Chart graduation |
1 hPa |
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| Sensing element |
Aneroid bellows |
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| Recording method |
Cartridge ink pen on a rotating paper chart |
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| Chart drive |
Quartz mechanism |
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| Recording periods |
7 days or 32 days, as specified in the current instruction manual |
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| Power supply |
Two C-size zinc-carbon batteries, R14P |
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| Battery life |
Approximately one year in 7-day recording mode |
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| Standard recording pen |
Violet cartridge pen, 7238-04 |
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| Typical pen life |
Approximately six months in 7-day recording mode, depending on conditions |
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| Dimensions |
336 mm wide × 295 mm high × 148 mm deep |
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| Weight |
Approximately 3.1 kg, excluding batteries |
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| Standard accessories |
One box of 7-day charts containing 55 sheets, two C-size zinc-carbon batteries and instruction manual |
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Choose the correct recording period
Use a 7-day chart for a weekly replacement routine or a 32-day chart for a longer overview. The printed chart period must match the cylinder speed setting.
Existing instruments with 1-day operation: Earlier product information lists a 1-day setting, and Sato lists a matching 1-day chart. However, the current NSII-BQ manual specifies 7-day and 32-day operation. Check the speed selector on your instrument before ordering 1-day charts.
Replacement chart paper and cartridge pens
Use the part numbers below when requesting consumables. For chart orders, include the recording period and the code printed on your existing chart.
| Part number | Consumable | Chart reference / pack | Selection note |
|---|
| 7237-60 |
1-day barograph chart |
NB244045
400 sheets |
Confirm that the installed cylinder drive supports 1-day recording. |
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| 7237-62 |
7-day barograph chart |
AB1684045
55 sheets |
For weekly recording; standard chart supplied with the instrument. |
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| 7237-64 |
32-day barograph chart |
AB324045
55 sheets |
Match the cylinder speed to the 32-day chart. |
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| 7238-04 |
Violet cartridge pen |
Single pen |
Standard replacement pen specified for the NSII-BQ. |
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| 7238-02 |
Violet cartridge pens |
12-piece set |
For planned maintenance or multiple instruments. |
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| 7238-08 |
Red cartridge pen |
Single pen |
Alternative colour listed in Sato’s barograph consumables range. |
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| 7238-06 |
Red cartridge pens |
12-piece set |
Alternative colour in a multipack. |
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Chart scale: Sato lists these standard replacement charts with a printed pressure range of 945–1045 hPa. This differs from the instrument’s stated measuring range of 940–1045 hPa. If readings below 945 hPa must appear on the chart, confirm the appropriate chart before ordering.
Older pen references: If your previous order shows 7210-90 or 7210-92, include that reference and a photograph of the existing pen. Confirm the appropriate current part before replacement.
Paper recording or digital measurement?
The NSII-BQ suits a workflow built around physical charts. If you need digital atmospheric pressure readings and a PC connection, view the Sato SK-500B digital barometer.
For local pressure indication with a reference pointer and glass thermometer, view the Sato 7610-20 Baromex aneroid barometer.
Instrument and consumable enquiries
Contact us for pricing and availability. Specify whether you require a complete NSII-BQ / 7237-00 barograph, replacement chart paper or cartridge pens.
- Instrument quantity or consumable part number and pack quantity.
- Required recording period: 1 day, 7 days or 32 days.
- Existing instrument model and chart code for replacement orders.
- Expected atmospheric pressure range and installation location.
- Calibration or certificate requirements, if applicable.
