Digital
Barometer
PTB220 Series
Barometer
The PTB220 series digital barometers are designed for a
wide environmental pressure and temperature range. They are very accurate and stable - the
class A barometers have a total accuracy of ?.2 hPa, class B barometers ?.3 hPa and
class C barometers ?.4 hPa. The optional local display has two rows and it can
simultaneously show the barometric pressure, three-hour pressure trend and the WMO
pressure tendency code. These barometers are ideal to be used e.g. as ship barometers,
transfer standards and replacement for mercury barometers.
A single barometer can have one, two, or three pressure
transducers. Two or three transducers provide redundancy which improves measurement reliability in airport, weather station and pressure standard applications.
The PTB 220 series digital barometers use the BAROCAP?
silicon capacitive absolute pressure sensor developed by Vaisala for barometric pressure
measurement applications. The BAROCAP sensor has excellent
repeatability characteristics and outstanding temperature and long-term stability.
Specifications
Note: Hectopascal (hPa) is the barometeric pressure
unit recommended by WMO and also accepted by ISO.
1 hPa = 1 mbar
Operating
Ranges |
| Pressure range |
500 to 1100hPa |
| Temperature range |
| operating |
-40 to +60°C (-40 and +140°F) |
| with local display |
0 to +60°C (32 and +140°F) |
| storage |
-60 to +60°C (-76 to +140F) |
| Humidity range |
non-condensing |
Accuracy |
| |
0.1% R* |
Class A |
Class B |
Class C |
| Linearity |
?.05 hPa |
?.05 hPa |
?.10 hPa |
?.25 hPa |
| Hysteresis |
?.02 hPa |
?.03 hPa |
?.03 hPa |
?.05 hPa |
| Repeatability |
?.02 hPa |
?.03 hPa |
?.03 hPa |
?.05 hPa |
| Calibration uncertainty |
?0 ppm |
?.07 hPa |
?.15 hPa |
?.15 hPa |
| Accuracy at +20°C |
?00 ppm |
?.10 hPa |
?.20 hPa |
?.30 hPa |
| |
| Temperature dependence |
?.1 hPa |
| Long-term stability |
?.1 hPa / year |
| Total accuracy including on year drift |
| Class A |
?.20 hPa |
| Class B |
?.30 hPa |
| Class C |
?.40 hPa |
*Class A / 800 to 1100 hPa / +20°C
General
(factory settings•) |
| Supply voltage |
10 to 30 VDC reverse polarity protected |
| Supply voltage sensitivity |
negligible |
| Current consumption |
| operation mode |
less than 30 mA |
| with local display |
less tha 50 mA |
| hardware shutdown mode |
less than 0.1 mA |
| Serial I/O |
RS 232C• full duplex or bidirectional TTL level or
RS 485/422 half duplex |
| Pulse output |
TTL level pulse output at about 5kjz or 50khz |
| Pressure units |
hPa•, mbar, kPa, Pa, inHg |
| Resolution |
| Class A |
0.01 hPa• |
| Class B & C |
0.1 hPa• |
| Setting time at power-up (one sensor) |
| Class A |
3 seconds• |
| Class B & C |
2 seconds• |
| Responce time (one sensor) |
| Class A |
2 seconds• |
| Class B & C |
1 seconds• |
| Acceleration sensitivity |
negligible |
| Pressure connector |
M5 (10-32) internal thread |
| Pressure fitting |
barbed fitting for 1/8" I.D. tubing |
| Maximum pressure limit |
5000 hPa abs. |
| Electrical connector |
female 9-pin subD |
| Weight |
1Kg |
The PTB Digital Barometer has many variations and options available
to make it work with your specific needs. Please call or email
us with your requirements and we will be happy to give you the exact
configuration you need, prices, and delivery times. Prices for
these units vary from approximately $1200 to $3200 depending on exact
specifications. Allow four to eight weeks for delivery. The
following meter is considered a "special order item."
Delivery times are approximate and additional shipping charges may
be applicable. l
Send comments to: jsi@jsits.com
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