Vaisala PTB220 Technical data

PTB220 Digital Barometer

P.O. Box 26, FIN-00421 Helsinki, FINLAND

Tel: [phone]

Fax: [phone]

Email: [e-mail]

www.vaisala.com

Features/Benefi ts

• 500...1100 hPa or 50...1100 hPa

pressure ranges

• -40...+60 °C (-40…+140 °F)

operating temperature range

• Total accuracy ±0.15 hPa (class A)

• Long-term stability

±0.1hPa/yr (500...1100 hPa)

• Several output options

• Available with one, two, or three

barometric pressure transducers

• NIST traceable (certi cate included)

 e Vaisala BAROCAP® Digital Barometer PTB220 o ers excellent performance in a variety
of applications.

Vaisala BAROCAP® Digital Barometer
PTB220 is designed for measurements
in a wide environmental pressure and
temperature range.  e barometers are
ideal to be used e.g. as ship barometers,
as transfer standards, in weather
stations and as replacements for
mercury barometers.

Accuracy and stability

 e PTB220 barometers feature
extremely high accuracy. Class A
barometers are  ne adjusted and
calibrated against a deadweight tester.
Class B barometers are adjusted and
calibrated using electronic working
standards. All PTB220 barometers are
delivered with a factory calibration
certi cate, which is NIST traceable.

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.

 e local display has two rows and
it can simultaneously show the
barometric pressure, three-hour
pressure trend and WMO pressure
tendency code.

Vaisala BAROCAP®
technology

 e PTB220 barometers use the
inhouse developed Vaisala BAROCAP®
Sensor.  is silicon capacitive
absolute pressure sensor has
excellent hysteresis and repeatability
characteristics, and outstanding
temperature and long-term stability.

Transfer standard

With the Vaisala BAROCAP®
Barometric Pressure Transfer Standard
PTB220TS, barometers can be used
as traveling and transfer standards.
 e PTB220TS includes an oak
case, a sealed lead acid battery, and
recharging electronics.  e PTB220
barometer can be installed in the
case at the factory.  e case can also
be ordered separately for installation

with the customer's existing PTB220
barometer.  e high accuracy of the
PTB220 makes the PTB220TS an
ideal transfer standard for calibrating
barometers in the  eld.

 e PTB220TS (transfer standard) includes
an oak case, a sealed lead acid battery and
rechargeable battery. When the PTB220
transmitter is enclosed, the case provides
added protection and ease of portability.

108

Vaisala Instruments Catalog 2007

Ref. B210641en rev. A

PTB220

Technical Data

Operating range (1hPa=1mbar)

Pressure range (order speci ed) 500...1100 hPa, 50...1100 hPa
Temperature range
operating -40...+60 °C (-40…+140 °F)
with local display 0...+60 °C (+32…+140 °F)
storage -60...+60 °C (-76…+140 °F)
storage with local display -20...+60 °C (-4…+140 °F)

Humidity range non-condensing

Accuracy

500...1100 hPa
Class A Class B
Linearity* ±0.05 hPa ±0.10 hPa
Hysteresis* ±0.03 hPa ±0.03 hPa
Repeatability* ±0.03 hPa ±0.03 hPa
Calibration uncertainty** ±0.07 hPa ±0.15 hPa
Accuracy at +20 °C *** ±0.10 hPa ±0.20 hPa

50...1100 hPa
Linearity* ±0.20 hPa
Hysteresis* ±0.08 hPa
Repeatability* ±0.08 hPa
Calibration uncertainty** ±0.20 hPa
Accuracy at +20 °C (+68 °F) *** ±0.30 hPa

Temperature dependence****

500...1100 hPa ±0.1 hPa

50...1100 hPa ±0.3 hPa
Total accuracy (-40...+60 °C / -40...+140 °F)

500...1100 hPa Class A ±0.15 hPa
Class B ±0.25 hPa

50...1100 hPa ±0.45 hPa
Long-term stability

500...1100 hPa ±0.1 hPa/year

50...1100 hPa ±0.2 hPa/year

* De ned as ±2 standard deviation limits of endpoint non­ linearity, hysteresis error or repeatability error.
** De ned as ±2 standard deviation limits of inaccuracy of
the working standard including traceability to NIST.
*** De ned as the root sum of the squares (RSS) of endpoint
nonlinearity, hysteresis error, repeatability error and

calibration uncertainty at room temperature.

Dimensions in
mm (inches)

6.5 (0.26)

145 (5.71)

133 (5.24)

BAROMETRIC PRESSURE

****De ned at ±2 standard deviation limits of temperature
dependence over the operating temperature range.

General

(•Factory setting)
Supply voltage 10...30 VDC reverse polarity protected
Supply voltage sensitivity negligible
Current consumption
operation mode less than 30 mA
with local display less than 50 mA
hardware shutdown mode less than 0.1 mA
Serial I/O RS 232C
bidirectional TTL level or
RS 485/422 half duplex
code ASCII
parity none, even
data bits 7
stop bits 1
Pulse output TTL level pulse output
at 5 kHz or 50 kHz
Pressure units hPa•, mbar, kPa, Pa, inHg,
mmH20, mmHg, torr, psia
Baud rates 300, 600, 1200, 2400, 4800, 9600
Resolution
class A 0.01 hPa
class B 0.1 hPa
Settling time at power-up (one sensor)
class A 4 s
class B 3 s
Response time (one sensor)
class A 2 s
class B 1 s
fast measurement mode 0.2 s•
Acceleration sensitivity negligible
Pressure connector M5 (10-32) internal thread
Pressure  tting barbed  tting for 1/8" I.D. tubing
quick connector with shuto valve for 1/8" hose
Maximum pressure limit 5000 hPa abs.

Electrical connector female 9-pin subD
Housing epoxy painted aluminum
Weight 1 kg
Electromagnetic compatibility Complies with EMC standard
EN 61326-1, Generic Environment

Optional analog output module

Output range 0…5 VDC•, 4…20 mA
Supply voltage (reverse polarity protected) 15...30 VDC
Resolution 4 Pa
Total accuracy +15…+30 °C (+60…+85 °F)
class A ±0.25 hPa
class B ±0.30 hPa

 e module provides a secondary barometer output and is supplied
without a calibration certi cate.
Note:  e analog output is available only for one pressure transducer.

• full duplex or

•, odd

• or 8

• or 2

•

•

•

•

•

•

•

65 (2.56)

Vaisala Instruments Catalog 2007

Ref. B210641en rev. A

120 (4.72)

104 (4.09)

120 (4.72)

139.5 (5.49)

Accessories

213119 DC adapter for PTB220/PTU200 series
213026 DC adapter for PTB220/PTU200 series & RS232 cable for PC
AC adapter, universal 100-240 VAC with US, EURO, UK or AUS plugs,
to be used together with 213119 or 213026

25.6 (1.01)

BAROCAP® is a registered trademark of Vaisala.
Speci cations subject to change without prior notice.

109