REGIN PDTX…-C Differential Pressure Transmitter with Communication Instruction Manual
- June 9, 2024
- REGIN
Table of Contents
REGIN PDTX…-C Differential Pressure Transmitter with Communication
Instruction Manual
Note! More information about the product configuration can be found in the variable list, which is available for download from www.regincontrols.com
Caution! Read and understand the instruction before using the product.
Caution! Ensure that the installation complies with local safety regulations.
Caution! Before installation or maintenance, the power supply should first be disconnected. Installation or maintenance of this unit should only be carried out by qualified personnel. The manufacturer is not responsible for any eventual damage or injury caused by inadequate skills during installation, or through removal of or deactivation of any security devices.
Function
Presigo PDTX…-C is a range of pressure transmitters equipped with one or two pressure sensors, two universal inputs, two universal outputs and an RS485 port for Modbus communication. It operates as a Modbus slave. This range of pressure transmitters is especially well suited as distributed I/O modules for air handling unit controllers. They are designed for easy installation together with Regin’s Corrigo or EXOcompact controllers.
Technical data
| Supply voltage | 24 V AC/DC (21…27 V AC/DC) |
|---|---|
| Protection class | IP54 |
| Power consumption | < 4 VA |
| Ambient humidity | 0…95 % RH (non-condensing) |
| Ambient temperature | -25…+50 °C |
| Working range, pressure | 0…1250 / 0…2500 / 0…7500 Pa (factory setting) |
0…12 / 0…25 / 0…75 mbar0…127 / 0…254 / 0…764 mmH2O0…5 / 0…10 / 0…30 inH2O
Working range, flow| 0…65000 m3/h (factory setting) 0…31000 l/s0…65000
Ft3/min
Cable glands| 2 x M20 (cable diameter 5…12 mm)1 x M16 (cable diameter
3.5…10 mm)
Max overvoltage| ±18 V, on any terminal (not G and G0)
Electronic damping| 0 s (0…120 s)
Accessories, included| Two pressure outlets (straight) and 2 m plastic
tube. Art. no.: ANS-20
Dimensions, external (WxHxD)| 167 x (~130) x 46 mm
Pressure data
| Media | Air, non-combustible and non-aggressive gases |
|---|---|
| Annual deviation | ±2 Pa (1250 Pa)±4 Pa (2500 Pa)±20 Pa (7500 Pa) |
| K-factor | 5 (5…700) |
Universal Input, UI1 and UI2
| Universal inputs (UI) | 2 |
|---|---|
| Configuration | AI (AI / DI), see specifications below |
Configured as AI:
| Analogue inputs (AI) | 0…10 V (0…10 V / PT1000 / Ni1000-01) |
|---|---|
| Accuracy | ± 1 % (0…10 V)± 0.5 K (PT1000/Ni1000-01) |
| Measuring range, temperature | -40…+60 °C |
Configured as DI:
| Digital input (DI) | Potential-free contacts on / off (on = closed) |
|---|---|
| Output current | 0.5 mA (max 2.5 V) |
Universal Output, UO1 and UO2
| Universal outputs (UO) | 2 |
|---|---|
| Configuration | AO (AO / DO), see specifications below |
Configured as AO:
| Analogue outputs (AO) | 0…10 V |
|---|---|
| Load impedance, 0…10 V | Min. 10 kΩ |
| Accuracy | ± 1 % |
Configured as DO:
| Configuration | Mosfet outputs, 24 V AC or DC, 2 A continuous |
|---|---|
| Power output | Max. 2A (total UO1 + UO2) |
Communication port data
| Communication ports | 1 |
|---|---|
| Port type | RS485 |
| Supported protocols | Modbus |
| Port isolation | Non-isolated |
| Cable length | Max 100 m |
Models
Article| Number of sensors| Max overload pressure
(kPa)| Measuring range, pressure (Pa)
---|---|---|---
PDTX12-C| 1| 25| 0…1250
PDTX25-C| 1| 50| 0…2500
PDTX75-C| 1| 120| 0…7500
PDTX12-2-C| 2| 25 / 25| 0…1250 (sensor 1) / 0…1250 (sensor 2)
PDTX25-2-C| 2| 50 / 50| 0…2500 (sensor 1) / 0…2500 (sensor 2)
PDTX12S25-C| 2| 25 / 50| 0…1250 (sensor 1) / 0…2500 (sensor 2)
PDTX12S75-C| 2| 25 / 120| 0…1250 (sensor 1) / 0…7500 (sensor 2)
Installation
The transmitter comes with one cable gland mounted and two loose. If more than one cable is used, the other cable glands must be assembled to the housing. Screw in the cable gland until the plastic knockout in the housing snaps. Make sure to remove the plastic knockout completely. Secure the cable gland. See Figure 1.
Figure 1 Installing the cable glands
- Mount the transmitter horizontally or vertically on a stable, vibration-free surface. If the unit is installed in a humid environment, install it vertically with the cable gland edge of the unit pointing down to allow moisture to escape.
- Refer to the graphics below for wiring. Connect the communication cable to terminals 3(A) and 4(B). Use the leftmost cable gland for supply voltage and communication.
- Power up the unit. Set the desired communication settings in the menu (see Settings). Note that the transmitter uses the default Modbus address = 1.
- Refer to the Presigo PDTX…-C variable list for information on how to access transmitter data.
- Let the unit warm up for 10 minutes, then perform a zero-set calibration by pressing the push-button (see Handling).
- Connect plastic tubes from the ventilation duct to the pressure inlets.
The two leftmost inlets are connected to sensor 1 and the other two to sensor 2. The inlet marked with ‘+’ should be used to connect the tube with the highest pressure and the inlet marked with ‘-‘ to the one with the lowest pressure.
Note! A straight cut off nipple must be used for mounting in the ventilatio 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 branching and at 6 duct diameters after bends and branching
Wiring
| Terminal | Name | Description |
|---|---|---|
| 1 | 24 V (G) + | Power supply 24 V AC/DC (Positive) |
| 2 | 24 V (G0) – | Power supply 24 V AC/DC (Negative/ Ground) |
| 3 | RS485 – A | Communication A (-) |
| 4 | RS485 – B | Communication B (+) |
| 5 | UO1 | Universal output 1 |
| 6 | 24 V (G) + | Internally connected to Terminal 1 |
| 7 | GND | Internally connected to Terminal 2 |
| 8 | UO2 | Universal output 2 |
| 9 | UI1 | Universal input 1 |
| 10 | GND | Internally connected to Terminal 2 |
| 11 | UI2 | Universal input 2 |
Use a shielded, twisted pair cable for RS485 communication. At high risks of interference, a 120 Ω terminating resistor should be mounted at each end of the communications circuit.
Wiring examples
Figure 2 UIx as 0…10 V input and UOx as 0…10 V output
Figure 3 UIx as digital input and UOx as digital output
Figure 4 UIx as temperature input
Settings
Communication settings can be viewed and changed either via the menu system or through Modbus communication. All other settings are accessed and modified via Modbus. The joystick is used to manoeuvre within the menu system (see Table 1). Pressing the joystick briefly results in entering the viewing mode. When in viewing mode all configured universal inputs and outputs, including pressure and flow sensor values, can be viewed. To enter the settings mode, press the joystick for at least 5 s when the display is inactive.
Table 1 Navigate the menu system
| Joystick movements | Action |
|---|---|
| ○ (push in) | Accept/selectLong press for settings mode (> 5 s) Short press |
for viewing mode
↑| Select next
↓| Select previous
←| Back / cancel
Getting started
How to view and modify settings in the menu system:
- Enter into viewing or setting mode by pressing and releasing the joystick (long or short press) when the display is inactive
- Navigate through the different sub menus by moving the joystick up or down
- Select a sub menu by pressing and releasing the joystick
- If in setting mode, select a value to modify by pressing and releasing the joystick
- Change the value by moving the joystick up or down
- Confirm the setting by pressing and releasing the joystick, or move the joystick left to discard the changes
- Move the joystick left to return to the previous menu
Note! The last configuration entered into the transmitter is always valid, regardless of whether it was performed using the menu system or via Modbus.
Viewing mode menu
| Sub menu | Description |
|---|---|
| P.# | Pressure valueP.1 = sensor 1 / P.2 = sensor 2 |
| F.# | Flow valueF.1 = sensor 1 / F.2 = sensor 2 |
| d.# | UI: Value in digital moded.1 = UI1 / d.2 = UI2 |
| u.# | UI: Value in 0-10 V modeu.1 = UI1 / u.2 = UI2 |
| t.# | UI: Value in temperature mode (°C)t.1 = UI1 / t.2 = UI2 |
| L.# | UO: Value in digital modeL.1 = UO1 / L.2 = UO2 |
| U.# | UO: Value in 0-10 V modeU.1 = UO1 / U.2 = UO2 |
Two digits can be shown at a time in the display. Therefore, several subsequent views are used to display a longer value. Example: A pressure value of 2350 Pa on sensor 1 is shown with three views, i.e. 1) P.1 2) 23 3) 50. The measuring unit for the displayed value is set via Modbus
Note! The K-factor has to be set via Modbus to be able to view correct flow values. Information regarding flow calculation is found in the variable list.
Settings mode menu
Settings related to the communication can be changed in the settings mode menu via the display
| Sub menu | Description |
|---|---|
| .A | Modbus address (1-247), given as hexa- decimal numbers (1-F7) |
| .b | Modbus baud rate (see Table 2) |
| .C | Modbus settings (see Table 3) |
Table 2 Settings in the sub menu .b
| Modbus baud rate | Description |
|---|---|
| 12 | 1200 bps |
| 24 | 2400 bps |
| 96 | 9600 bps (factory setting) |
| 19 | 19200 bps |
| 38 | 38400 bps |
| 57 | 57600 bps |
Table 3 Settings in the sub menu .C
| Modbus settings | Description |
|---|---|
| n1 | 8 bytes, 1 stop bit, no parity (factory setting) |
| n2 | 8 bytes, 2 stop bits, no parity |
| E1 | 8 bytes, 1 stop bit, even parity |
| E2 | 8 bytes, 2 stop bits, even parity |
| o1 | 8 bytes, 1 stop bit, odd parity |
| o2 | 8 bytes, 2 stop bits, odd parity |
When the transmitter is connected to Regin’s Corrigo controller, it is configured as an expansion unit. When configuring the unit for Regin’s freely programmable products the addressing can be set via Modbus. See the Corrigo manual and the PDTX…-C variable list for more information.
Note! All documentation can be downloaded from www.regincontrols.com
Handling
Three LEDs are available to show different states.
| LEDs | Description |
|---|---|
| Yellow | RS485 data transmission indication |
| Red | Global device status. Is activated when an error is present (see the |
variable list for more details).
Green| 1 Hz flash rate: Normal operation5 Hz flash rate: Zero-set calibration
is preformed 25 Hz flash rate: Factory reset is performed
Push-button
| Action | Description |
|---|---|
| Quick press | Zero-set pressure calibrationThe green LED will be flashing when |
the zero-set operation has been made.
Long press (> 10 s)| Reset to factory default settingsThe green LEDs will be
flashing during the opera- tion. The unit will then reset and restart.
Zero-set pressure calibration
A short press on the push-button will zero-set calibrate the available pressure sensors.
Note! Be sure to disconnect the pressure tubes before doing this. Let the unit warm up for 10 minutes before attempting zero-set.
Factory reset
A long press on the push-button, more than 10 seconds, will perform a factory restore of user defined settings. Table 4 displays some of the settings that will be restored.
Table 4 Factory settings
| Description | Factory setting |
|---|---|
| Working range, pressure | 0…1250 / 0…2500 / 0…7500 Pa |
| Working range, flow | 0…65000 m3/h |
| UI | 0…10 V |
| UO | 0…10 V |
| Modbus address | 1 |
| Modbus setting | 8 bytes, 1 stop bit, no parity |
| Modbus baud rate | 9600 bps |
| K-factor | 5 |
Note! All changes made with Modbus will be reset when a factory reset is made.
This product carries the CE-mark. More information is available at www.regincontrols.com.
Documentation
All documentation can be downloaded from www.regincontrols.com
Contact
AB Regin, Box 116, 428 22 Kållered, Sweden
Tel: +46 31 720 02 00, Fax: +46 31 720 02 50
www.regincontrols.com,
info@regincontrols.com
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