Sato NSII-BQ Sigma II Barograph for Atmospheric Pressure Recording
The Sato NSII-BQ Sigma II Barograph, catalogue number 7237-00, records atmospheric-pressure changes on a paper chart. It provides a visible pressure trace for routine observation, review and filing.
An aneroid bellows senses pressure while a quartz-driven cylinder moves the chart beneath a cartridge pen. Choose this format when a physical record is part of your measurement routine.
Key Features
- Atmospheric-pressure range: 940–1045 hPa.
- Paper-chart recording with 1 hPa graduations.
- Current manual specifies 7-day and 32-day recording periods.
- Powered by two C batteries.
- Supplied with 55 sheets of 7-day chart paper.
Specifications
| Specification | Details |
|---|
| Model / catalogue number |
NSII-BQ / 7237-00 |
| Pressure range |
940–1045 hPa |
| Accuracy |
±1 hPa from 950–1040 hPa; ±2 hPa elsewhere within the measuring range |
| Chart graduation |
1 hPa |
| Sensing element |
Aneroid bellows |
| Recording |
Cartridge pen on a rotating paper chart |
| Clock / recording periods |
Quartz; 7 or 32 days according to the current manual |
| Power |
Two C zinc-carbon batteries |
| Battery life |
Approximately one year in 7-day mode |
| Dimensions |
336 W × 295 H × 148 D mm |
| Weight |
Approximately 3.1 kg excluding batteries |
| Standard violet pen |
7238-04 |
Charts and Recording Periods
Match the chart time scale to the cylinder setting. A chart with the wrong time scale makes the recorded timing misleading even if the pressure trace appears normal.
| Chart reference | Chart marking | Recording period |
|---|
| 7237-62 |
AB1684045 |
7 days |
| 7237-64 |
AB324045 |
32 days |
| 7237-60 |
NB244045 |
1 day — confirm recorder compatibility |
Sato still lists the 1-day chart, but the current NSII-BQ manual specifies only 7-day and 32-day operation. If you need daily recording, send a photograph of your cylinder speed selector before ordering.
Replacement Cartridge Pens
| Reference | Colour | Pack |
|---|
| 7238-04 |
Violet |
Single pen |
| 7238-02 |
Violet |
12 pens |
| 7238-08 |
Red |
Single pen |
| 7238-06 |
Red |
12 pens |
The current instrument specification identifies 7238-04 as the standard violet pen. Earlier Seacom references 7210-90 and 7210-92 are retained here for replacement enquiries; confirm the correct current pen and pack size before ordering.
Browse recording pens and recorder consumables.
Choosing a Paper or Electronic Pressure Record
A barograph suits work that calls for a visible chart and manual filing. If you need remote readings, alarms or electronic records, describe those requirements so we can help select an appropriate pressure instrument and recording system.
Compare Seacom’s barometers and atmospheric-pressure instruments.
Need Help with an NSII-BQ Barograph?
Contact Seacom Process Instruments Sdn Bhd with your installation location, expected pressure range and required recording period. For consumables, include the recorder label, chart marking and existing pen reference.
.png)
Sato Thermohygrograph Catalogue
(309.1k)
