INSTRUCTION
Read this instruction before installation
and wiring of the product
Presigo PDT...C(-2) 1
Presigo PDT...C(-2)
Pressure transmitter
Presigo PDT...(-2) is a range of pressure transmitters with one or
two pressure sensors, two universal inputs and an RS485 port for
data exchange. The RS485 port can be easily configured for either
EXOline or Modbus communication. The transmitter can be used as a
slave unit in an EXOline or Modbus system.
Technical data
Supply voltage 24 V AC/DC ±15 %
Protection class IP54
Calculated power consumption 2 VA (rms).
Minimum trafo size 7.5 VA.
Data transmission channel Non-isolated RS485 (max. 100 m)
Overall accuracy, pressure ≤1 % full scale
Annual deviation (typical)
P1250 models ±2 Pa
P2500 models ±4 Pa
P7500 models ±20 Pa
Damping (settable) 1…12 s
K-factor (settable) 5…700
Operating temperature range -25...+50°C
Operating humidity Max.95 % RH (non-condensing)
Accessories, included Two pressure outlets (straight) and
2 m plastic tube. Art. no.: ANS-20
Overvoltage on any terminal Max. ±18 V (referenced to GND)
Pressure data, Media Air, non-combustable and non-aggres
sive gases
Universal inputs UI1, UI2
Configured as Ambient
temperature
Accuracy Range
PT1000* -25...0°C ±1 K -40...+60°C alt.
-40...140°F
0...50°C ±0.5 K
Ni1000; 6180 ppm/K -25...0°C ±1 K -40...+60°C alt.
-40...140°F
0...50°C ±0.5 K
0...10 V - ± 1 % full
scale
-
Digital input Potential-free contacts on/off(closed=on)
* Factory setting
Pressure ranges (full scale)
Model Pa (factory
setting)
mBar mmH2O inH2O
PDT12C PS1 0…1250 0…12.5 0…125 0…5
PDT25C PS1 0…2500 0…25 0…250 0…10
PDT75C PS1 0…7500 0…75 0…750 0…30
PDT12C-2 PS1 0…1250 0…12.5 0…125 0…5
PS2 0…1250 0…12.5 0…125 0…5
PDT12S25C-2 PS1 0…1250 0…12.5 0…125 0…5
PS2 0…2500 0…25 0…250 0…10
PDT25C-2 PS1 0…2500 0…25 0…250 0…10
PS2 0…2500 0…25 0…250 0…10
PDT12S75C-2 PS1 0…1250 0…12.5 0…125 0…5
PS2 0…7500 0…75 0…750 0…30
NOTE: The suffix in the name denotes the number of sensors in the unit:
• No suffix: One sensor (only PS1 is present, reading PS2 related
parameters will yield a zero value reading).
• -2: Two sensors
The “S” in the name denotes split/different sensor ranges for PS1 and
PS2.
Flow settings
The following flow ranges apply when selecting a unit of measure-
ment for flow measurement:
Unit Flow ranges (full scale)
l/s 0…31000
m3/h (factory setting) 0…65000
CFM [Ft3/min] 0…65000
Installation
NOTE: Use a shielded, twisted pair cable for RS485 communication.
At high risks of interference, a 120 Ωterminating resistor should be
mounted at each end of the communications circuit.
1. Mount the transmitter horizontally or vertically on a stable,
vibration-free surface. If the unit is installed in a humid environ-
ment, install it vertically with the cable gland edge of the unit
pointing down to allow moisture to escape.
2. Refer to the graphics below for wiring. Connect the communica-
tion cable to terminals 3(B) and 4(A). Use the leftmost cable
gland for supply voltage and communication. Use the rightmost
cable gland for the universal inputs.
3. Set the DIP-switches to the desired operating mode and param-
eters. DIP-switch 6 can be used to offset the ELA address to
allow setting up two units at the same time. The transmitter uses
the address 1 as a default address for Modbus. For EXOline,
dual sensor transmitters use 242:1 as default address and single
sensor transmitters use 242:3 as their default address.
4. Power up the unit. Refer to the variable list in the Presigo
PDT...C(-2) manual for information on how to access transmitter
data.
5. Let the unit warm up for 10 minutes, then perform a zero-set
calibration by pressing the pushbutton.
6. Connect plastic tubes from the ventilation duct to the pressure
inlets.
NOTE: A straight cut offnipple must be used for mounting in the
ventilation duct.
For optimal measuring results, measuring points with turbulent
air flow should be avoided. Preferably, measuring should be
performed at a distance of 2 duct diameters before bends and
11799H
AUG 23
EN
