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Sato NSII-BQ Sigma II Barograph – Atmospheric Pressure Recorder

Keep a paper record of atmospheric pressure with the Sato NSII-BQ Sigma II barograph (7237-00). An aneroid bellows moves the recording pen as pressure changes, producing a visible trace on a rotating chart.

Pressure range: 940–1045 hPa with 1 hPa chart graduations.
Recording periods: 7-day or 32-day operation as specified in the current manual.
Quartz chart drive: Powered by two C-size batteries.
Paper records: Supplied with 55 sheets of 7-day chart paper; replacement charts and cartridge pens are available separately.

Description Attachments

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
Manufacturer	Sato
Product / model	Sigma II Barograph / NSII-BQ
Catalogue number	7237-00
Measured parameter	Atmospheric pressure
Measuring range	940–1045 hPa
Accuracy	±1 hPa from 950 to 1040 hPa; ±2 hPa elsewhere within the measuring range
Chart graduation	1 hPa
Sensing element	Aneroid bellows
Recording method	Cartridge ink pen on a rotating paper chart
Chart drive	Quartz mechanism
Recording periods	7 days or 32 days, as specified in the current instruction manual
Power supply	Two C-size zinc-carbon batteries, R14P
Battery life	Approximately one year in 7-day recording mode
Standard recording pen	Violet cartridge pen, 7238-04
Typical pen life	Approximately six months in 7-day recording mode, depending on conditions
Dimensions	336 mm wide × 295 mm high × 148 mm deep
Weight	Approximately 3.1 kg, excluding batteries
Standard accessories	One box of 7-day charts containing 55 sheets, two C-size zinc-carbon batteries and instruction manual

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.
7237-62	7-day barograph chart	AB1684045 55 sheets	For weekly recording; standard chart supplied with the instrument.
7237-64	32-day barograph chart	AB324045 55 sheets	Match the cylinder speed to the 32-day chart.
7238-04	Violet cartridge pen	Single pen	Standard replacement pen specified for the NSII-BQ.
7238-02	Violet cartridge pens	12-piece set	For planned maintenance or multiple instruments.
7238-08	Red cartridge pen	Single pen	Alternative colour listed in Sato’s barograph consumables range.
7238-06	Red cartridge pens	12-piece set	Alternative colour in a multipack.

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.