Testo 6321 Specifications

testo AG · Testo-Strasse 1 · D-79853 Lenzkirch · www.testo.com

Wall version with
display

Wall version
without display

testo 6321

Committing to the future

Differential pressure transmitter

A differential pressure transmitter with a good
price/performance ratio for applications in air
conditioning and ventilation technology. The automated
building services must always be monitored precisely,
whereby the requirements placed on the measuring
technology are increased. testo 6321 fulfills these
requirements by ensuring the best possible system
function, optimization of the climatic conditions and
energy savings by means of highly accurate
measurement, stable over the long-term, of the
differential pressure.

Areas of application

• Industrial and commercial buildings, e.g. in
production and storage

• Offices and administrational buildings

• Sales areas and exhibition halls

• Museums and libraries

• School buildings, hotels, clinics etc.

DS 6321 EN/msp/A/12.02.2010 Status 12th Feb. 2010 Subject to change without notice.

• Measurement of differential pressure in the

measuring range of 100 Pa to 2 bar

• Magnetic valve for automatic zero-point adjustment
guarantees high temperature-independent accuracy
and long-term stability

• Accuracy ±1.2 % of measuring range + intrinsic error
of 0.3 Pa – valid for zeroing cycle of 60 sec/nominal
temperature +22 °C

• P2A software for parameterization, adjustment and
analysis, saves time and costs in commissioning and
maintenance

• Freely scalable: ±50% of measuring range final value
and free scalability within the measuring range

• Diverse analog outputs and measuring ranges

• Display optional

SPECIFICATIONS

testo 6321

SPECIFICATIONS

testo 6321

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Subject to change without notice.

testo AG · Testo-Strasse 1 · D-79853 Lenzkirch · www.testo.com

Supply

Display

Differential pressure

Analog outputs

Further outputs

Housing

Miscellaneous

Display 1-line LCD (optional)

testo 6321

Differential pressure transmitter

Technical data

Measurement parameters

DS 6321 EN/msp/A/12.02.2010 Status 12th Feb. 2010

Measuring range 0 to 100 Pa

0 to 10 hPa
0 to 20 hPa
0 to 50 hPa
0 to 100 hPa
0 to 500 hPa
0 to 1000 hPa
0 to 2000 hPa

-100 to 100 Pa

-10 to 10 hPa

-20 to 20 hPa

-50 to 50 hPa

-100 to 100 hPa

-500 to 500 hPa

-1000 to 1000 hPa

-2000 to 2000 hPa

Measurement uncertainty* ±1.2% of measuring range final value

±0,3 Pa
Temperature gain drift: 0.05% of
measuring range per Kelvin deviation
from nominal temperature 22 °C
Zero-point drift: 0%
(due to zero-point adjustment)

Measuring rate 1/s

Resolution 12 bit

Accuracy of the analog
outputs

0 to 1 V ±2,5 mV
0 to 5 V ±12,5 mV
0 to 10 V ±25 mV
4 to 20 mA ±0,05 mA

Max. load 500 Ω

Overload capacity Measuring range Overload

0 to 100 Pa 20000 Pa
0 to 10 hPa 200 hPa
0 to 20 hPa 200 hPa
0 to 50 hPa 750 hPa
0 to 100 hPa 750 hPa
0 to 500 hPa 2500 hPa
0 to 1000 hPa 2500 hPa
0 to 2000 hPa 2500 hPa

-100 to 100 Pa 20000 Pa

-10 to 10 hPa 200 hPa

-20 to 20 hPa 200 hPa

-50 to 50 hPa 750 hPa

-100 to 100 hPa 750 hPa

-500 to 500 hPa 2500 hPa

-1000 to 1000 hPa 2500 hPa

-2000 to 2000 hPa 2500 hPa

Inputs and outputs

Output type 0 to 1/5/10 V (4-wire)

4 to 20 mA (4-wire)

other analog outputs Minin DIN for P2A software (adjustment

and parameterization software)

Voltage supply 20 to 30 V AC/DC

Current consumption 30 mA

General

Material / colour ABS / white (RAL 9010) or light grey

Weight Approx. 160 g

Resolution Measuring range Resolution

0 to 100 Pa 0.1 Pa
0 to 10 hPa 0.01 hPa
0 to 20 hPa 0.01 hPa
0 to 50 hPa 0.01 hPa
0 to 100 hPa 0.1 hPa
0 to 500 hPa 0.1 hPa
0 to 1000hPa 1 hPa
0 to 2000hPa 1 hPa

-100 to 100 Pa 0.1 Pa

-10 to 10 hPa 0.01 hPa

-20 to 20 hPa 0.01 hPa

-50 to 50 hPa 0.01 hPa

-100 to 100 hPa 0.1 hPa

-500 to 500 hPa 0.1 hPa

-1000 to 1000 hPa 1 hPa

-2000 to 2000 hPa 1 hPa

Humidity (sensor) 0 to 90 %rF

Temperature (sensor) -5 to +50 °C

Storage temperature -40 to +80 °C

* Measurement inaccuracy according to GUM: ±1.2% of measuring range final value ±0.3 Pa
GUM (Guide to the Expression of Uncertainty in Measurement):
ISO guideline for the determination of measurement uncertainty, in order to make measurement
results comparable worldwide.
The following variables are taken into account in determining uncertainty:

- Hysteresis - Long-term stability

- Linearity - Adjustment site/works calibration

- Reproduceability - Test site

Protection class IP65

only when the transmitter is wired
and/or sealing plugs are in use

EMC EC guideline: 2004/108/EC

Automatic zero-point
adjustment

Every 60 seconds ex-works

Operating conditions

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Sensor Piezoresistive sensor

Autom. zero-point adjustment via magnetic valve