Product Programme; Installation - Comefri 99998035 Handbuch

PRODUCT PROGRAMME

Type Product
99998035 Pressure transmitter, 0-2500 Pa,
display, flow
FUNCTION
Model 99998035 is a pressure transmitter for
comfort ventilation systems. It provides an
active current or voltage signal proportional to
the measured air pressure. If the pressure trans-
mitter is set for flow measurement, differential
pressure (Δp) is converted to volume flow (qv)
using the following formula: qv = k•√Δp. Model
99998035 consists of a semiconductor pressure
element with no air throughput, thus protecting
the unit against dust in the ventilation system.
The pressure element is temperature compen-
sated to provide accurate pressure measure-
ment throughout the specified temperature
range.
The required measurement range of the pres-
sure transmitter is set using three push buttons.
The buttons are also used to set the k-factor to
be used for flow calculation. Pressure or flow
is selected by simply changing a DIP switch
setting and replacing m³/s with m³/h, l/s, cfm or
Pa on the front cover.
By selecting flow range P, pressure transmitter
model 99998035 can directly replace pressure
transmitters with existing square root output
and flow display in %.
The screw terminals of the pressure transmitter
can provide a 0/2 - 10 V output signal and/or a
0/4 - 20 mA output signal (see fig. 3).
The 0-10 V output signal is provided by terminal
2 with DIP 1 of SW1 in position "Off".
The 2-10 V output signal is provided by terminal
2 with DIP 1 of SW1 in position "On".
The 0-20 mA output signal is provided by termi-
nal 4 with DIP 1 of SW1 in position "Off".
The 4-20 mA output signal is provided by
terminal 4 with DIP 1 of SW1 in position "On"
(see figs 3 & 8).
A DIP switch (DIP 2) allows two different
damping times to be selected so that pressure
fluctuations within the ventilation system are
attenuated in the transmitter output signal. If the
actual pressure / flow is outside the selected
measurement range, the display flashes.
CE MARKING
OJ Electronics A/S hereby declares that the
product is manufactured in accordance with
Council Directive 2004/108/EC on electromag-
netic compatibility (and subsequent amend-
ments) and Council Directive 2006/95/EC on
electrical equipment designed for use within
certain voltage limits.
UL RECOGNIZED COMPONENT FOR US
AND CANADA
According to the following standards:
UL-60730-1 and UL-60730-2-6
CAN/CSA-E60730-1:13
UL file number: E365638
Intended to be installed as incorporated Con-
trols in Class I equipment and are intended for
connection to a 24 V AC or DC (Class 2, SELV,
Limited Energy – Less than 15 W) supply. Type
PTH.
APPLIED STANDARDS
EN 61000-6-2 and EN 61000-6-3
TECHNICAL DATA MODEL 99998035
Full-scale pressure range 0 - 2500 Pa
Measurement ranges,
pressure -50.0 .. +50.0 Pa,
0.0 .. +100.0 Pa,
0.0 .. +150.0 Pa,
0.0 .. +300.0 Pa,
0.0 .. +500.0 Pa,
0.0 .. +1000 Pa,
0.0 .. +1600 Pa,
0.0 .. +2500 Pa.
Measurement ranges,
flow 1.00 m³/s, 3.00 m³/s,
5.00 m³/s, 10.00 m³/s,
30.00 m³/s, 50.00 m³/s,
100.0 m³/s, 100.0 m³/h,
300.0 m³/h, 500.0 m³/h,
1000 m³/h, 3000 m³/h,
5000 m³/h, 9999 m³/h,
30.00 m³/h x 1000,
50.00 m³/h x 1000,
99.99 m³/h x 1000.
m³/h can be replaced by
m 3 /s, l/s or cfm.
Square root output In the flow range P,
differential pressure is
measured as % of
full-scale pressure
range using square root
calculation.
k-factor 0.001 to 9999
Supply voltage 24 VAC ±15%, 50/60 Hz
13.5-28 VDC
Overvoltage Category I
Power consumption 0
.5 VA (-20 °C/+40 °C)
Output signal
(selectable) 0-10 VDC, 2-10 VDC
4-20 mA, 0-20 mA
Accuracy output signal
k*(√(∆p*1.015Pa + 2.5Pa) - √∆p) + 0.003*SR [m
(SR= set measuring range)
Damping (selectable) 0.4 s or 10 s
Max. pressure 20 kPa
Ambient temperature 0/+50°C (display)
-20/+40°C
(constant operation)
-30/+50°C (transient)
-50/+70°C (storage)
Software Class A
Dimensions 75 x 36 x 91 mm
(see figure 1)
Cable dimensions 4 x max. 1.5 mm²
Pressure connector 2 x Ø6.2 mm
Enclosure IP54
Pollution Degree 2
Weight 110 g

INSTALLATION

Model 99998035 must be securely mounted on
a level surface using screws. Model 99998035
is insensitive to mounting orientation. However,
in order to maintain the specified enclosure
rating, tubes should be attached to both tube
connectors if the connectors point upwards.
The enclosure is equipped with screw holes,
see fig. 1.
It is recommended to mount the model
99998035 in such a way that it is properly pro-
tected, and not exposed to direct sunlight
Pressure is connected by means of tubes.
The higher pressure must be connected to the
"+" connector and the lower pressure to the
"-" connector. If the tubes are unintentional-
ly exchanged, or the pressure is outside the
measurement range, the display flashes. The
pressure tubes must be as short as possible
and must be secured in position to prevent
vibration. To obtain the best possible results,
pressure must be measured where there is least
risk of turbulent air flow, i.e. in the centre of the
ventilation duct and at a suitable distance from
bends and branches. See fig. 2.
The enclosure is opened without the use of
tools by pressing the snap lock at the side of
the connectors. The transmitter cable may be
up to 50 m in length and must be connected as
shown in fig. 3.
The transmitter cable must be kept separate
from mains-carrying cables as voltage signals
from these may affect transmitter function.
© 2014 OJ Electronics A/S
SETTINGS
Select pressure or flow by setting the DIP
switch (SW1, DIP3) (see figs 3 and 4). To display
the measurement range, press the "" , ""
or "OK" button on the rear cover once (see fig.
5). If the buttons are not pressed again within
60 seconds, the display will revert to showing
the actual measured value. Press "" or ""
repeatedly to change the measurement range
up/down. The measurement range will flash on
the display until the setting has been saved by
pressing the "OK" button.
Pressure measurement (fig. 10): If the DIP
switch (SW1, DIP3) is set for pressure meas-
urement, actual pressure will be shown on the
display. Dial SW2 is not used.
Flow measurement (fig. 11): If the DIP switch
(SW1, DIP3) (fig. 4) is set for flow measurement,
pressing the "OK" button allows the first digit
of the k-factor to be set. The value will flash
and can be set using the "" and "" buttons.
When set correctly, press "OK" and set the sec-
ond, third and fourth digits and the position of
the comma correspondingly." Then press "OK"
to save the k-factor and the display will auto-
matically begin showing the actual measured
value. If standard flow measurement is selected,
no pressure range need be set. An example of
flow calculation is shown in fig. 12.
/s] Square root output (fig. 13): If flow range P is
3
selected, model 99998035 functions as a pres-
sure transmitter with square root output and
flow is displayed in per cent (Delta P [%]). Full-
scale is determined by the set pressure range
(p-range) and the value shown on the display is
calculated as Delta P [%] = 100x√(Δp/p-range).
When flow range P is selected, pressing "OK"
allows the pressure range to be selected. Once
the pressure range has been selected, press
"OK" to save the setting and the display will au-
tomatically begin showing the actual measured
value.
Changing measurement unit: Depending on the
k-factor unit and the selected flow range, attach
one of the accompanying self-adhesive unit
labels to the front cover of the transmitter (see
figs 6 and 7).
Screw terminal 2 of the pressure transmitter can
provide a 0/2 - 10 V output signal while screw
terminal 4 can provide a 0/4 - 20 mA output
signal (see fig. 3).
The minimum value of the output signal is set
on SW1, DIP1 (see fig. 8).
Set the damping time with the DIP switch
(SW1, DIP2) (see figs. 3 and 9). The transmitter
measures the pressure several times within the
set time and the average of these measure-
ments is continuously reproduced in the output
signal. This allows any pressure fluctuations
within the ventilation system to be dampened in
the transmitter output signal.
ZEROING If necessary, the transmitter can be
zeroed after it has been mounted and the power
supply connected. For best results, wait until
the transmitter has reached usual operating
temperature. Before zeroing the transmitter, it is
important to ensure that the pressure on the "+"
and "-" connectors is equal (e.g. by stopping
the ventilation system). If the display shows a
differential pressure of more than 10 Pa there
may be unintended pressure in the system
(draughts or pinched tubes). It is recommended
that pressure tubes be removed from the "+"
and "-" connectors during zeroing. Zeroing is
activated by pressing the integrated "Zero-set
switch" (SW3) (see fig. 3), after which the yellow
LED will continue to flash until zeroing has been
completed.
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