90,0
71,5
36,0
150 grams, with accessories 290 grams

MODBUS RTU, over RS485
8 data bits, parity bit: selectable, 1 stop bit, baud rate: selectable
0.8s / 2s / 10s
Access via MODBUS or by push button. Recommended every 12 months. or by optional autozero module. AZ calibrates zero point automatically. *)
30 kPa
Air and non-aggressive gases
Piezoresistive

24 VDC ± 10 % / 24 VAC ± 10 %
< 1.3 W
via Modbus

ABS
PC
ABS

Male ∅ 5,0 mm and 6,3 mm
M20

-10 ± +50°C
(setting display: 0°C ± +50°C)
(AZ model: -5 ± +50°C)
-20 ± +70°C
0 ± 95% RH

IP54
Meets the requirements for CE marking:
RoHS Directive: 2002/95/EC
EMC Directive: 2004/108/EC
WEEE Directive: 2002/96/EC

Connection Diagram

Settings

Zero-point adjustment

Note! Supply voltage must be connected one hour before the 0-point adjustment is carried out.
1) Loose both tubes from the pressure inlets + and – or ensure that the existing differential pressure is zero. (eg. air handling unit switched off)
2) Send the zeroing command via modbus or press the push button. The red led turns ON.
3) Wait until LED turns off and then install tubes again to the pressure inlets
It is recommended to adjust the zero point every 12 months during normal operation
• If the transmitter is equipped with automatic zero element the manual zeroing is not required.
• If the differential pressure in the measurement point is controlled to be zero (etc. air handling unit switched off), the zeroing can be done via modbus.

Optional auto zero element *

Optional auto zero element makes the transmitter maintenance free for periodical manual zeroing. The element automatically adjusts the transmitters zero point from time to time, this eliminates the zero point long term drift of the piezoresistive sensing element.
Zero point adjustment is carried out every 10 minutes. During zero point adjustment the output and display values will freeze to the latest measured value. The automatic zero point adjustment takes 3,5 seconds.

Modbus functions

The device supports to the following functions and registers:

FUNCTION 04 - Read input Register

Register	Parameter Description	Data type	Value	Range
3x0001	Program version	16 bit	0 ÷ 1000	0,00 ÷ 99,00
3x0002	Pressure in Pascals	16 bit	0 ÷ 2000	0,00 ÷ 2000(Pa)

FUNCTION 05 - Write Single coil

Register	Parameter Description	Data type	Value	Range
0x0001	Zeroing function	0 bit	0 ÷ 1	On - Off

To zeroing, write 1 to register 0x0001. The register 0x0001 state returns back to 0 automatically after zeroing.

(-IN)

Input Modules for Differential Pressure Transmitters

Input module is a plug-in module for DPT-MOD that converts external field signals into Modbus RTU network. It can be assembled into DPT-MOD afterwards, even in the field and on site.

Usage & Applications

Enhanced with input module, the Differential Pressure Transmitter with Modbus interface can be used as a Temperature Transmitter as well.

Reduce costs

Installation costs are significantly reduced when you do not need to use separate temperature transmitters or Modbus converters. Simply connect the temperature sensors into the input module and read the signal over Modbus RTU interface.

Input signals can be read over MODBUS via DPT MOD RS484 interface.

Input	Signals	Accuracy for measurement	Resolution (Modbus signal)
Input 1 and 2	0 ÷ 10V	< 0,5	0,1 %
	ntc10k	< 0,5	0,1 %
	Pt1000	< 0,5	0,1 %
	Ni1000/(-LG)	< 0,5	0,1 %
	BIN IN (potential free contact)

Modbus functions and registers

FUNCTION 02 – Read Input status

Register	Parameter Description	Data type	Value	Range
1x0001	Input 1 BIN IN	0 Bit	0 ÷ 1	On - Off
1x0002	Input 2 BIN IN	0 Bit	0 ÷ 1	On - Off

FUNCTION 04 – Read input Register

Register	Parameter Description	Data type	Value	Range
3x0004	Input 1 0 ÷ 10V	16 Bit	0 ÷ 100	0 ÷ 100%
3x0005	Input 1 Pt1000 temperature	16 Bit	-500 ÷ 500	-50 ÷ +50°
3x0006	Input 1 Ni1000	16 Bit	-500 ÷ 500	-50 ÷ +50°
3x0007	Input 1 NTC10k	16 Bit	-500 ÷ 500	-50 ÷ +50°
3x0008	Input 2 0 ÷ 10V	16 Bit	0 ÷ 100	0 ÷ 100%
3x0009	Input 2 Pt1000 temperature	16 Bit	-500 ÷ 500	-50 ÷ +50°
3x0010	Input 2 Ni1000	16 Bit	-500 ÷ 500	-50 ÷ +50°
3x0011	Input 2 NTC10k	16 Bit	-500 ÷ 500	-50 ÷ +50°
3x0012	Input 1 Ni1000-LG	16 Bit	-500 ÷ 500	-50 ÷ +50°
3x0013	Input 2 Ni1000-LG	16 Bit	-500 ÷ 500	-50 ÷ +50°

Configuration

The jumpers should be set according to the instructions below and the value should be read from the right register. Both inputs can be configured independently.

Jumpers

MODBUS RTU, over RS485 8 data bits, none parity, 1 stop bit, baud rate: selectable
3 x Screw terminal for wires, max 1.5 mm²
Push button for pressure zero point calibration
Cable entry M20
2 (both terminals can be used simultaneously and/or separately)