Technical Data - OJ Electronics PTH-3-DF Serie Instructions

NULSTILLING
Når transmitteren er monteret og strømmen
tilsluttet, kan transmitteren evt. nulstilles. Det
bedste resultat opnås når transmitteren har nået
normal driftstemperatur. Før nulstilling aktiveres,
bør det sikres, at tryk på "+" og "-" studse er
ens, f.eks. ved at stoppe ventilationsanlægget.
Viser displayet over 10 Pa differenstryk, kan
det skyldes utilsigtet tryk i anlægget (træk eller
afklemte slanger). Det anbefales, at trykslange(r)
er fjernet fra "+" og "-" studse, når nulstilling
udføres. Nulstilling startes ved at aktivere den
indbyggede "zero-set" switch (SW3) (se fig. 3),
hvor ved den gule lysdiode blinker indtil nulstil-
lingen er afsluttet.
LYSDIODE INDIKERING
Grøn LED lyser ved korrekt tilsluttet forsynings-
spænding. Gul LED blinker i ca. 3 sekunder
imens nulstilling udføres.
Lysdiode ON Blink
Grøn OK
Nulstilling
Gul
udføres
FIGURER
Fig. 1: Målskitse
Fig. 2: Placering af transmitter ifht. bøjninger
og forgreninger
Fig. 3: Tilslutningsdiagram
Fig. 4: Indstilling tryk/flow
Fig. 5: Valg af måleområde
Fig. 6: Ændring af måleenheder
Fig. 7: Valg af måleenhedsskilt
Fig. 8: Valg af udgangssignal
Fig. 9: Valg af dæmpning
Fig. 10: Trykindstilling
Fig. 11: Flow-indstilling
Fig. 12: Flow-beregningseksempel
Fig. 13: Kvadratrods-indstilling
Fig. 14: Placering af PTH
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lokale regler.
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OJ ELECTRONICS A/S
Stenager 13B · DK-6400 Sønderborg
Tel +45 73 12 13 14 · Fax +45 73 12 13 13
oj@ojelectronics.com · www.ojelectronics.com
English
PTH-3XXX-DF is a series of electronic pressure
transmitters designed primarily to measure total
and differential pressures in ventilation systems.
When used together with a standard aperture,
the pressure transmitter can also measure
air flow as a formula for converting differen-
tial pressure to air flow is incorporated in the
transmitter. The pressure transmitter is used for
monitoring, control and regulation purposes via
a controller, PLC or monitoring system.
Typical applications include:
- The maintenance/control of constant pressure
at a given position within the ventilation duct
system.
6
- The maintenance/control of desired under-
pressure within the ventilation duct system.
- Differential pressure measurement across
ventilation filter for optimum filter replacement.
- Volume flow determination via differential
pressure measurement across a standard
aperture.
PRODUCT PROGRAMME
Type
PTH-3202-DF
PTH-3203-DF
PTH-3502-DF
FUNCTION
PTH is a pressure transmitter for comfort
ventilation systems. It provides an active current
Off
or voltage signal proportional to the measured
Ingen forsyning
air pressure. If the pressure transmitter is set
for flow measurement, differential pressure
OK
(Δp) is converted to volume flow (qv) using the
following formula: qv = k•√Δp. PTH 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 compensated to provide
accurate pressure measurement 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 Pa with m3/h, m3/s or l/s
on the front cover.
By selecting flow range P, PTH pressure trans-
mitters can directly replace pressure transmit-
ters 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 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 pres-
sure / 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 92/31/EEC on electromagnetic
compatibility (and subsequent amendments)
and Council Directive 73/23/EEC on electrical
equipment designed for use within certain
voltage limits.
APPLIED STANDARDS
EN 61000-6-2 and EN 61000-6-3
TECHNICAL DATA PTH-3202-DF
Full-scale pressure range 0 - 2500 Pa
Measurement ranges,
pressure
Product
Pressure transmitter, 0-2500 Pa,
display, flow
Pressure transmitter, 0-2500 Pa,
display, flow
Pressure transmitter 0-5000 Pa,
display, flow
-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,
© 2021 OJ Electronics A/S
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 l/s or m3/s.
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

TECHNICAL DATA

Supply voltage ...................24 V~/=, ± 15%, 50/60 Hz
Power consumption ........................................... 0.5 W
Output ...............................................0-10 V=, 2-10 V=
Accuracy*
PTH-3202/3203 ........0.5 %×MV*+0.3 %×SR*+2.5 Pa
PTH-3502..................0.5 %×MV*+0.3 %×SR*+5.0 Pa
Maximum pressure
PTH-3202/3203/3502 .......................................30 kPa
Maximum load
0 – 10 V= ...........................................................>2.5kΩ
0 – 20 mA ........................................................ <=450Ω
Dampening (selectable) ............................0.4 s or 10 s
Housing dimensions (h×w×d) ...............91×75×38mm
Cable dimension ..........................................ø3-10 mm
Connection
PTH-3202/3203/3502 ........................ 4 x Screw term,
Pressure tubes .........................................2 × ø6,2 mm
Environment data
Storage temperature ........................... -40°C to +70°C
Operating temperature -20°C to +40°C (continuous)**
-30°C to +70°C (short-term)***
Operating humidity ...................... 10%RH to 95%RH,
Operating altitude ........................................... ≤2000m
Enclosure rating .....................................................IP54
Weight ..................................................................110 g
*Note: MV = Measured Value / SR = Set measuring
range
**Note: Ambient temperature affects the LCD
display speed and contrast
***Note: DC Supply is recommended if the
operation temperature exceed 40°C
TECHNICAL DATA PTH-3203-DF
Full-scale pressure range 0 - 2500 Pa
Measurement ranges,
pressure 0.0.. + 25.0 Pa,
0.0.. + 50.0 Pa,
0.0.. + 100.0 Pa,
0.0.. + 200.0 Pa,
0.0.. + 250.0 Pa,
0.0.. + 500.0 Pa,
0.0.. + 625.0 Pa,
0.0..1000 Pa
0.0..1250 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 l/s or m³/s.
Square root output In the flow range P,
differential pressure is
0-20 mA, 4-20 mA
max 1.5mm²
non-condensing