Mar 07
Sågmästaregatan 1D Fax: +46-(0)31-812766 Web: www.vcp.se
416 80 Göteborg, Sweden
Air Differential Pressure Transmitters
with 0-10 Vdc or 4-20 mA Output
984M-
series
Features
• Selectable output via jumper
0-10 Vdc or 4-20 mA output, 3-wire
with power supply 24 Vac/dc
• 4-20 mA output, 2-wire
with power supply 24 Vdc
• LED display as option on the 3-wire version
•2 adjoining pressure ranges in one unit,
pressure ranges selectable via jumper
•Pressure ranges
from 0-100 Pa up to 0-250 kPa
•Response time 100 ms and 1 s
selectable via jumper
Technical data
Pressure medium Air and non-aggressive gases
Linearity and
hysteresis error < ± 1 % of FS
Working temperature 0 to +50 °C
Storage temperature -10 to +70 °C
Long-term stability, typ. < ± 0.5 % to 2.5% of FS / year
(depending on pressure range)
Repetition accuracy <± 0.2 % of FS
Position dependence < ± 0.02 % of FS / g
Humidity 0 to 95 % rel, non-condensing
Response time 100 ms or 1 s
(jumper selectable)
Maximum load < 500 ohm
Process connection 6 mm hose pipe
Electrical connection Screw terminal block for wire
up to 1.5 mm2
Mounting Screw mounting with
serrated screws
Housing material Housing with process
connection P2 made of ABS,
mounting part with process
connection P1 made of POM
Housing dimensions approx. Ø 85 x 58 mm
Weight approx. approx. 130 g
Protection category
to EN60529 IP54
Cable conduit for
protection cap M20 x 1.5 made of Polyamide
Standards / Conformance EN60770, EN61326
Display, optional Red LED display, 3.5 digits
(only on 984M.3x3314)
984M without LED display 984M with LED display
984M are supplied with duct fixing kit,
packed together in a carton
Description
The differential pressure transmitters of the 984M series are
used for measuring differential pressure, positive pressure
and vacuum.
Selection of output signal
The output signal of the 3-wire version is configurable.The
factory setting is for a 0-10 Volt output signal, but this can be
changed to 4-20 mA by removing the jumper. The 2-wire
version is only available with a 4-20 mA output signal.
Selection of pressure range
To adapt best for the application the transmitter can be
selected between two adjoining pressure ranges. Factory
setting is for the most sensitve range, by opening of a
jumpered bridge the less sensitive range is activated.
Selection of response time
The response time of the output signal can be selected by a
jumpered bridge. Factory setting is for a slow response time
(1 s), which dampens short pressure peaks. To work with a
fast response time (100ms) this bridge needs to be replaced.
Easy offset calibration
The output signal can be calibrated to zero by pressing the
M key (pressure transmitter must be depressurised).
Switching output (only for the 3-wire version)
As well as an analogue output signal, the differential pressure
transmitter contains an adjustable transistor switching output
with a maximum switching capacity of 35 Vdc/100 mA.
Measuring method
Piezoresistive pressure transducer
Mounting position
They can be mounted in any position. Due to the
selfcompensating piezoresistive pressure transducer any
possible mounting error is eliminated.
