Volume flow indicator / monitor / transmitter SENSO-X® VPX
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| Sensors PG1 | Data sheet No. 13170 | Version 03-2020
Built-in version
Mill a 115 mm Ø hole in the sandwich plate or cabinet door
and push the functional part through the opening from the
front. The mounting direction is indicated by an arrow pointing
upward on the back of the device. Screw the threaded rod
into the threaded sleeve with a screwdriver; slip the mounting
bracket over it and secure with a wing nut. When connecting
the pressure transfer hoses, care must be taken to comply with
the direction of the pressure (+/-). Finally, the front panel can be
snapped into place.
Surface-mounted housing
Screw the functional part onto a wall, duct or similar and then
connect it to the power and pneumatic lines. Then slip the ring
cover over the functional part and snap on the front cover.
Design
The
built-in version
of the
SENSO-X
®VPX consists of a round
section and a square or round front cover. The instrument is
optimized for installation in ventilation devices and control
cabinets. The two pressure test points, (positive
pressure side) and - (negative pressure side), are sunk into the
housing on the back. In the middle is a threaded sleeve. Attach
the retaining bracket using the supplied threaded rod and wing
nut. The wing nut is secured against loosening. Two cable
breakthroughs are provided on the back of the housing. Two
M16 x 1.5 screw joints are included in the assembly kit. An
integrated O-ring serves to seal the functional part against the
mounting surface. The arrow on the back of the device points
upward in the correct mounting position.
The
surface-mounted version
of the
SENSO-X®
VPX consists of
a round functional part with three screw-on mounting brackets,
a ring cover and a snap-on front cover. The two measurement
connections, (positive-pressure side) and – (negative-
pressure side), exit at the bottom. Exiting at the bottom are also
two strain relief elements.
Built into the functional part in all versions, and visible from the
front, are an LCD display, an LED to indicate when limit values
are exceeded and 4 function keys.
After installation and configuration of the device, the front
cover is snapped onto the functional part. Due to 3 guided
notches this is only possible in the correct position. Removing
the front cover is done by pulling with both hands or by using
a screwdriver.
Operating principle
The measured differential pressure is transmitted via flexible
hoses and connecting nipples onto the piezoelectric differential
pressure sensor, electronically evaluated, converted into units of
volume flow taking into account the programmed k-factor and
density ρ and displayed on the LCD indicator.
This calculation is based on the following formula
Vh = volume flow [m³/h]
K = K-factor [m²s/h]
∆p = differential pressure [Pa]
ρ = air density [kg/m³]
V
h
= K x
√
2 x ∆p
ρ
Note: Many fan manufacturers use simplified basic formulas
and accordingly modified K-values. State the manufacturer
when entering the K-factor, and the transmitter will take
this into account. Please refer to the table below for identi-
fiers of the most common manufacturers:
Non-binding information. Please note the current
data sheets of the manufacturers. Subject to change. If the
manufacturer of your choice is not listed, enter the K-factor
manually. Use the setting D = “Uni” for this purpose. This is also
the default setting.
The additional parameter “No. of fans” allows for fan walls/fan
grids. Enter the number of fans. The default setting is 1.
Activation and operation
Make all electrical connections before connecting the supply
voltage. Connect the 24 V supply voltage with the correct polarity
to start up the
SENSO-X®
VPX.
The device is ready for use immediately.
To set the parameters either take off the front panel and enter
the desired settings via the 3 keys or use the NFC tool (Windows
program for PCs: see Specification Sheet 13180; or Android App
for smartphones / tablets in the Google Play Store).
Setting display unit (dimension)
A brief push of the lower key (S1) in normal operation mode swit-
Manufacturer
Manufacturer
identifier
„Manufactor“
Example
types
Calculated
K-factor K1
transmitter
ebm-pabst
A
R3G, K3K, … K = 0,7746 * K
ebm
Fläkt
B
CXLF, GXLB,
GPEB, …
K = 2788,5 / K
Fläkt
Nicotra
Gebhardt
C
RZR, RZA, … K = K
Gebhardt
Rosenberg
C
DKH, GKH, … K = K
Rosenberg
Ziehl-Abegg
A
ER…C,
GR…C, …
K = 0,7746 * K
Ziehl
Comefri
C
-
K = K
Comefri
Unassigned
value / uni-
versal
D
-
K =
(enter value)
