Testo 6381 Specifications

Committing to the future

testo 6381

Differential pressure transmitter with humidity temperature option

The

testo 6381 was
developed specially for monitoring differential pressure
in the measuring range from 10 Pa to 1000 hPa. In
cleanroom technology, the maintenance of positive
pressure prevents the entry of contaminated air. In
order to keep the cleanroom conditions constant, the
transmitter additionally calculates the parameters
volume flow and flow velocity from the measured
differential pressure. Thanks to an optional probe from
the probe series 6610, the additional recording of
humidity and temperature with one instrument is also
possible.

The testo 6381 is particularly outstanding thanks to

SPECIFICATIONS

testo 6381

• Measurement of differential pressure, flow velocity,
volume flow; optional: humidity and temperature

• Automatic zero-point adjustment guarantees high,
temperature-independent accuracy and long-term
stability

the automatioc zero-point adjustment which ensures
high accuracy and long-term stability.

The integrated self-monitoring and early warning
function also the operator

uptime.

&

SPECIFICATIONS

differential pressure transmitter

ensures

maximum

testo 6381

Subject to change without notice.

• Low measurement range to 10 Pa ensures very
high precision at lowest pressures

• The robust metal housing protects tough
ambient conditions

• Display with multi-language operating menu and
optical alarm display

• Ethernet, relay and analog outputs allow optimum
integration into individual automation systems

• Self-monitoring of the transmitter and early warning
function

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

• Scalability of ±50 percent of the measuring range
final value and free scalability within the measuring
range

• Configurable alarm management with adjustable
response delay and alarm acknowledgement

.

ensure maximum uptime

programming

down

against

Typical applications:

• Differential pressure monitoring between
cleanrooms; optional: simultaneous measurement of
ambient temperature and humidity

• Monitoring drying processes

• Differential pressure measurement in filling
processes and spray-painting systems

tteessttoo

inc. 40 Whitel Lake Road Sparta, NJ 07871

www.testo.us

Differential pressure transmitter with humidity/temperature option

Technical data

testo 6381

Parameters

ifferential pressure

D

easuring range 0 to 10 Pa

M

to 50 Pa

0
0 to 100 Pa
0 to 500 Pa
0 to 10 hPa

to 50 hPa

0

to 100 hPa

0

to 500 hPa

0
0 to 1000 hPa

10 to 10 Pa

­50 to 50 Pa

-

-100 to 100 Pa

-500 to 500 Pa

-10 to 10 hPa

-50 to 50 hPa
100 to 100 hPa

-

-500 to 500 hPa
1000 to 1000 hPa

-

Measurement uncertainty* ±0,5% of measurement range final value

±0.3 Pa
Temperature gain drift: 0.02% of
measuring range per Kelvin deviaton
from nominal temperature 22 °C
Zero-point: 0% (thanks to cyclic zero­point adjustment)

Selectable units Differential pressure in Pa, hPa, kPa,

mbar, bar, mmH
HG, inch H

alculated parameters: volume flow in

c

3

m

h, l/min, Nm

/

low velocity in m/s, ft/min

F

O, kg/cm2, PSI, inch

2

O

2

3

h, Nl/min

/

Sensor Piezoresistive sensor

Autom. Zero-point
adjustment

Overload

via magnetic valve
Frequency adjustable: 15 sec, 30 sec, 1

in, 5 min, 10 min

m

MMeeaassuurriinngg rraannggee OOvveerrllooaadd

0 ... 10 Pa 0,1 Pa
0 ... 50 Pa 0,1 Pa
0 ... 100 Pa 0,1 Pa
0 ... 500 Pa 0,1 Pa
0 ... 10 hPa 0,01 hPa
0 ... 50 hPa 0,01 hPa
0 ... 100 hPa 0,1 hPa
0 ... 500 hPa 0,1 hPa
0 ... 1000 hPa 1 hPa

-10 ... 10 Pa 0,1 Pa

-50 ... 50 Pa 0,1 Pa

-100 ... 100 Pa 0,1 Pa

-500 ... 500 Pa 0,1 Pa

-10 ... 10 hPa 0,01 hPa

-50 ... 50 hPa 0,01 hPa

-100 ... 100 hPa 0,1 hPa

-500 ... 500 hPa 0,1 hPa

-1000 ... 1000 hPa 1 hPa

Parameters

robe

P

Type

Parameters

MMeeaass.. rraannggee

Humidity /

race humidity

t

Temperature

MMeeaassuurreemmeennt
uunncceerrttaaiinnttyy*

*

Humidity

Dewpoint

Temp. at
+25°C /
+77°F

Inputs/outputs

umidity/temperature optional

H

testo 6612testo 6611 testo 6613 testo 6614 testo 6615 testo 6617

Wall

hannel Channel Duct

C

eated

h

able

C

race

t
humidity

Self-check

able with

C

over elec-

c
trode
monitoring

%RH / °C/°F / °C

/ °Fwb / kJ/kg / mbar / inch H

20 to +70 °C

­4 to +158 °F

-

/ °Ftd/ g/kg / gr/lb / g/m3 / gr/ft³ / ppmV / °Cwb

td

0 to 100 %RH -60 to +30 °C

30 to +150 °C

-

-22 to +302 °F

O / °Ctm (H2O2)/°Ftm (H2O2) / % Vol

2

td

40 to +180 °C

-

-40 to +356 °F

-40 to +120 °C

-40 to +248 °F

0 to 100 %RH

-40 to +180 °C

-40 to +356 °F

t

testo 6611 testo 6612 testo 6613 testo 6614 testo 6615 testo 6617

1.0 %RH for 0 to 90 %RH /

±

±1.4 %RH for 90 to 100 % RH

±1.0 %RH for
0 to100 %RH

1.2 %RH for

±
0 to 90 %RH /
±1.6 %RH for

90 to 100 %RH

for deviations from media temp. ±25 °C:±0.02 %RH/K

±1 K at
0 °C td
±2 K at

-40 °C td
±4 K at

-50 °C td

±0,15 °C/

32,2 °F

Pt1000 1/3 Klasse B

±0.15 °C/

32.2 °F

Pt100 1/3

Class B

±0,15 °C/

32,2 °F

Pt1000 1/3

Klasse B

Analog outputs

Quantity Standard: 1;

with optional humidity probe: 3

Output type 0/4 to 20 mA (4-wire) (24 VAC/DC)

0 to 1/5 to 10 V (4-wire) (24 VAC/DC)

Scaling Differential pressure: scalable ±50% of

measuring range final value;
freely scalable within measuring range

* Measurement inaccuracy according to GUM.
FFoorr ddiiffffeerreennttiiaall pprreessssuurree::
FFoorr hhuummiiddiittyy::

Additional humidity-dependent inaccuracy contribution

±0.8% of measuring range final value ±0.3 Pa

+0.007 * MW (in %RH).
GGUUMM(GG

uide to the Expression of UUncertainty in MMeasurement):
ISO guideline for the determination of measurement inaccuracy, in order to make
measurements comparable worldwide.
The following inaccuracies are used for the determination:

- Hysteresis

- Linearity

- Reproducibility

- Long-term stability (only for differential pressure)

- Adjustment site/factory calibration

- Test site

Subject to change without notice.

tteessttoo

inc. 40 Whitel Lake Road Sparta, NJ 07871

Meas. cycle 1/sec

Resolution 12 bit

Max. load max. 500 Ω

Other outputs

Ethernet Optional

Relay Optional: 4 relays (free allocation to

measurement channels or as collective
alarm in operating menu/P2A), up to
250 VAC/3A (NO or NC)

Digital Mini-DIN for P2A software

Supply

Voltage supply 20 to 30 VAC/DC, 300 mA current

consumption, galvanically separate
signal and supply line

www.testo.us