Delta OHM HD402TR Series Manuel utilisateur

HD402T, HD402ST, HD402AT

• Sensor with high accuracy and stability

• Measurement of pressures relative to the atmosphere or dierential

pressures

• Dual analog output, current (active or passive) and voltage, or RS485

Modbus-RTU output

• Versions with or without LCD display

Applications

• Control of air conditioning and ventilation

• Control of lters

• Monitoring of clean rooms

• Pneumatic controls

• Respirators

• Vaporizers

Description

The series of transmitters HD402xT... is suitable for measuring relative

pressure with respect to atmosphere or dierential pressure in the range

from as low as 0-50 Pa to 0-200 kPa.

These transmitters use a silicon piezoresistive sensor with high accuracy

and temperature compensation, which has excellent linearity, repeatability

and stability over the time.

The output signal of the sensor is converted, depending on the model,

into a:

• RS485 Modbus–RTU digital output (HD402ST);

• voltage 0...10 V or active current 0...20 mA / 4...20 mA analog output

(HD402T);

• 2-wire (current loop) 4...20 mA analog output (HD402AT).

The output signal can be transmitted over long distances with high

immunity to interference (in the models with analog output the maximum

distance depends on the load and the section of the connection cables,

but distances of several hundred meters are commonly reached).

Dierent units of measurement can be chosen for each model and, in the

models with analog output, it is possible to choose the full scale (f.s.) value

for the output (high, intermediate or low range) and set the unipolar (0 ...

+f.s.) or bipolar (-f.s. ... +f.s.) measuring range.

The conguration can be made through a series of dip switches mounted

on the circuit board or by connecting the serial port of the transmitter to

the PC.

Thanks to the particular sensor used, the transmitters are insensitive to

orientation and position. Moreover, the high stability of the sensor over the

time and in comparison to the changes in temperature allows to eliminate

the operations of maintenance typically required to compensate for the

aging and the deviation of the sensor zero.

The option “display” (L) is available, in this case the values of pressure are

displayed on a 4 digit display under the unit of measure set by the user.

The transmitters are supplied ready for use and factory calibrated in 3

points.

Power supply: 24Vac or 18...40 Vdc for the models with voltage and active

current analog output, 12...30 Vdc for the models with passive current

analog output and for the models with RS485 Modbus RTU output.

Technical specications

Sensor Piezoresistive, High stability

Measuring range from 0…50 Pa to 0…200 kPa both relative and dierential

(please refer to table 1)

Resolution Please refer to table 2

Accuracy @ 25 °C

± 1.5% f.s. nominal for HD402xT1

± 0.75% f.s. nominal for HD402xT2

± 1% f.s. nominal for HD402xT3, HD402xT4 and HD402xT5

Accuracy @ 0…50 °C

± 3% f.s. nominal for HD402xT1

± 1% f.s. nominal for HD402xT2, HD402xT3, HD402xT4 and

HD402xT5

Long term stability

(1000 h) @ 25 °C

± 0.5% f.s. nominal for HD402xT1 and HD402xT2

± 0.35% f.s. nominal for HD402xT3

± 0.25% f.s. nominal for HD402xT4 and HD402xT5

Output

• HD402T…: Active analog 0…10 Vdc (RLmin = 10 k)) or

0…20 or 4…20 mA (RLmax = 500 )

• HD402AT…: 2-wire (current loop) 4…20 mA (RLmax =

(Vdc-12)/0,022)

• HD402ST…: Digital RS485 Modbus RTU

Response time Congurable 0.125, 1, 2 or 4 seconds for the output

0.5 seconds for the display updating

Overpressure limit

50 kPa for the models with f.s. up to 10 kPa

200 kPa for the model with f.s. 100 kPa

400 kPa for the model with f.s. 200 kPa

Compatible media Only air and non-aggressive dry gases

Power supply HD402T…: 24 Vac ± 10% or 18…40 Vdc

HD402AT, HD402ST…: 12…30 Vdc

Absorption HD402T… and HD402AT…: < 1 W @ 24 Vdc

HD402ST…: < 100 mW @ 12 Vdc

Pressure connection Ø 6.2 mm for tubes with internal Ø 5...6 mm

Electrical

connections

Screw terminal block, max 1.5 mm2 ,

PG9 cable gland for the input cable

Operating conditions -10...+60 °C / 0…95% RH

Storage temperature -20...+70 °C

Housing dimensions 80 x 84 x 44 mm

Protection degree IP65

HD402T HD402ST HD402AT

PRESSURE TRANSMITTERS

TAB. 1: full scale values and units of measurement

Model Pa kPa mbar mmH2O inchH2O mmHg PSI

HD402T1 50/100/250 --- 0,5/1/2,5 5/10/25 0,2/0,4/1 --- ---

HD402T2 250/500/1000 --- 2,5/5/10 25/50/100 1/2/4 --- ---

HD402T3 --- 2,5/5/10 25/50/100 --- --- 10/25/50 0,4/0,75/1,5

HD402T4 --- 25/50/100 250/500/1000 --- --- 100/250/500 4/7,5/15

HD402T5 --- 50/100/200 500/1000/2000 --- --- 250/500/1000 10/15/30

TAB. 2: resolution

Model Pa kPa mbar mmH2O inchH2O mmHg PSI

HD402T1 0.1 --- 0.001 0.01 0.001 --- ---

HD402T2 1--- 0.01 0.1 0.01 --- ---

HD402T3 --- 0.01 0.1 --- --- 0.01 0.001

HD402T4 --- 0.1 1 --- --- 0.1 0.01

HD402T5 --- 0.1 1 --- --- 1 0.01

Fig. 1: dimensions (mm)

Installation

In any model the sensor and the electronics are housed in a rugged plastic

case with IP65 protection degree. By opening the lid, 3 mm diameter holes

are available so to allow securing the base of the transmitter directly to a

panel or to the wall.

Ø 3

Fig. 2: xing holes (dimensions in mm)

The transmitter can be mounted in any position, but typically it is secured

on a vertical wall with the pressure taps facedown. The deviation of the

zero due to the mounting position can be corrected by using CAL ZERO.

The procedure for the manual calibration of the zero is the following:

• make sure that the transmitter is powered at least for 1 hour;

• disconnect both the tubes from the pressure + and – inputs;

• press CAL ZERO until the red LED starts ashing;

• when the red LED turns o, the zeroing procedure is completed and

you can reconnect the tube to the pressure connections.

It is recommended to follow the auto-zero procedure at least once a year

under normal operating conditions.

CAL ZERO

LED

COM AUX

1 2 3 4 5 6

DIP SWITCH

1 2 3 4 5 6

Models with active analog output

Models with RS485 output

Model with 2-wire current output

Fig. 3: CAL ZERO button and conguration dip-switches

TAB. 3: measuring ranges for outputs of the models HD402T1 and HD402AT1

Dip switch number

6 2 3 4 5 4 5 4 5 4 5

OFF OFF ON OFF OFF ON ON ON

Pa mmH2O inchH2O mbar

OFF

OFF ON 0…50.0 Pa 0…5.00 mmH2O 0…0.200 inchH2O 0…0.500 mbar

ON OFF 0…100.0 Pa 0…10.00 mmH2O 0…0.400 inchH2O 0…1.000 mbar

OFF OFF 0…250.0 Pa 0…25.00 mmH2O 0…1.000 inchH2O 0…2.500 mbar

ON ON

OFF ON -50.0…+50.0 Pa -5.00…+5.00 mmH2O -0.200…+0.200 inchH2O -0.500…+0.500 mbar

ON OFF -100.0…+100.0 Pa -10.00…+10.00 mmH2O -0.400…+0.400 inchH2O -1.000…+1.000 mbar

OFF OFF -250.0…+250.0 Pa -25.00…+25.00 mmH2O -1.000…+1.000 inchH2O -2.500…+2.500 mbar

ON ON

TAB. 4: measuring ranges for outputs of the models HD402T2 and HD402AT2

Dip switch number

6 2 3 4 5 4 5 4 5 4 5

OFF OFF ON OFF OFF ON ON ON

Pa mmH2O inchH2O mbar

OFF

OFF ON 0…250 Pa 0…25.0 mmH2O 0…1.00 inchH2O 0…2.50 mbar

ON OFF 0…500 Pa 0…50.0 mmH2O 0…2.00 inchH2O 0…5.00 mbar

OFF OFF 0…1000 Pa 0…100.0 mmH2O 0…4.00 inchH2O 0…10.00 mbar

ON ON

OFF ON -250…+250 Pa -25.0…+25.0 mmH2O -1.00…+1.00 inchH2O -2.50…+2.50 mbar

ON OFF -500…+500 Pa -50.0…+50.0 mmH2O -2.00…+2.00 inchH2O -5.00…+5.00 mbar

OFF OFF

-1000…+1000 Pa -100.0…+100.0 mmH2O -4.00…+4.00 inchH2O -10.00…+10.00 mbarON ON

ON ON

TAB. 5: measuring ranges for outputs of the models HD402T3 and HD402AT3

Dip switch number

6 2 3 4 5 4 5 4 5 4 5

OFF OFF ON OFF OFF ON ON ON

kPa mmHg PSI mbar

OFF

OFF ON 0…2.50 kPa 0…10.00 mmHg 0…0.400 PSI 0…25.0 mbar

ON OFF 0…5.00 kPa 0…25.00 mmHg 0…0.750 PSI 0…50.0 mbar

OFF OFF 0…10.00 kPa 0…50.00 mmHg 0…1.500 PSI 0…100.0 mbar

ON ON

OFF ON -2.50…+2.50 kPa -10.00…+10.00 mmHg -0.400…+0.400 PSI -25.0…+25.0 mbar

ON OFF -5.00…+5.00 kPa -25.00…+25.00 mmHg -0.750…+0.750 PSI -50.0…+50.0 mbar

OFF OFF

-10.00…+10.00 kPa -50.00…+50.00 mmHg -1.500…+1.500 PSI -100.0…+100.0 mbarON ON

ON ON

TAB. 6: measuring ranges for outputs of the models HD402T4 and HD402AT4

Dip switch number

6 2 3 4 5 4 5 4 5 4 5

OFF OFF ON OFF OFF ON ON ON

kPa mmHg PSI mbar

OFF

OFF ON 0…25.0 kPa 0…100.0 mmHg 0…4.00 PSI 0…250 mbar

ON OFF 0…50.0 kPa 0…250.0 mmHg 0…7.50 PSI 0…500 mbar

OFF OFF 0…100.0 kPa 0…500.0 mmHg 0…15.00 PSI 0…1000 mbar

ON ON

OFF ON -25.0…+25.0 kPa -100.0…+100.0 mmHg -4.00…+4.00 PSI -250…+250 mbar

ON OFF -50.0…+50.0 kPa -250.0…+250.0 mmHg -7.50…+7.50 PSI -500…+500 mbar

OFF OFF

-100.0…+100.0 kPa -500.0…+500.0 mmHg -15.00…+15.00 PSI -1000…+1000 mbarON ON

ON ON

TAB. 7: measuring ranges for outputs of the models HD402T5 and HD402AT5

Dip switch number

6 2 3 4 5 4 5 4 5 4 5

OFF OFF ON OFF OFF ON ON ON

kPa mmHg PSI mbar

OFF

OFF ON 0…50.0 kPa 0…250 mmHg 0…10.00 PSI 0…500 mbar

ON OFF 0…100.0 kPa 0…500 mmHg 0…15.00 PSI 0…1000 mbar

OFF OFF 0…200.0 kPa 0…1000 mmHg 0…30.00 PSI 0…2000 mbar

ON ON

OFF ON -50.0…+50.0 kPa -250…+250 mmHg -10.00…+10.00 PSI -500…+500 mbar

ON OFF -100.0…+100.0 kPa -500…+500 mmHg -15.00…+15.00 PSI -1000…+1000 mbar

OFF OFF

-200.0…+200.0 kPa -1000…+1000 mmHg -30.00…+30.00 PSI -2000…+2000 mbarON ON

ON ON

Electrical connections

Fig. 4: active current analog output

Fig. 5: voltage analog output

Fig. 6: 2-wire current analog output

Fig. 7: RS485 connection

In the RS485 connection, the instruments are connected in a sequence

through a shielded cable with twisted pair for signals and a third wire for the

common. Line termination must be set at the two network ends.

The maximum number of devices that can be connected to the RS485 line

(Bus) depends on the load characteristics of the devices to be connected. The

RS485 standard requires that the total load does not exceed 32 unit loads. The

load of an HD402ST… transmitter is equal to ¼ of unit load. If the total load is

greater than 32 unit loads, divide the network into segments and add a signal

repeater between a segment and the successive one. Line termination should

be applied at both ends of each segment.

The instrument has a built in line termination that can be connected or removed

through a short jumper placed next to the terminal block. If the instrument is

the last or the rst device of a network group, connect the termination placing

the short jumper between the“RT”and“120 ohm”indications. If the instrument

is not at the end of a network group, remove the termination placing the short

jumper between the “RT”and“OPEN”indications.

The cable shield must be connected to both line ends. The cable should have

the following features:

• Characteristic impedance: 120 ohm

• Capacity: less than 50pF/m

• Resistance: less than 100 ohm/km

• Gauge: 0,22 mm (AWG24) at least

The cable maximum length depends on baud rate and cable characteristics.

Typically, the maximum length is 1200 m.The data line must be kept separated

from any power lines in order to prevent interferences on the transmitted

signal.

+Vcc

Iout

Vout

Current

output

Voltage

output

Vout

GND

24 Vac

18...40 Vdc

24 Vac

18...40 Vdc

0/4...20 mA

OUT

0...10 V

OUT

Powe supply

Termination

Other sensors with

RS485 output

PLC, data logger or

RS485/USB or RS485/

RS232 converter for PC

CONFIGURATION OF THE MODELS WITH ANALOG OUTPUT (HD402T... /

HD402AT…)

Setting the conguration mode: the transmitter can be congured by using

the dip switches on the circuit board or via the serial communication port COM

AUX. The choice of the conguration mode is done with the dip switch 1:

1 2 3 4 5 6

OFF

Dip switch 1 = ON →the conguration set through the

dip switches 2...6 is used

Dip switch 1 = OFF →the conguration set via serial port

is used

Conguration by dip switch (models with analog output)

The conguration of the dip switches is used by the transmitter only if the

dip switch 1 is ON.

The dip switches 2 and 3 select the low, intermediate or high measuring

range for the analog output.

The dip switches 4 and 5 select one of the four available units in the model.

The dip switch 6 sets the unipolar (0 ... + f.s.) or bipolar (-f.s.....+ f.s.) measuring

range for the analog output.

A dip switch is OFF when placed down, towards the serial connector. Instead,

it is ON if placed up, towards the DIP SW sign.

The tables 3 to 7 at the following pages report..... report the measuring range,

for each model, corresponding to the analog outputs according to dip switch

positions.

Conguration via the serial port COM AUX (models with analog output)

The conguration set with the serial communication is used by the

transmitter only if the dip switch 1 is OFF.

In order to modify the settings, please proceed as follows:

• Connect the serial COM AUX output of the transmitter to the RS232

port (via the RS27 cable) or USB (via the cable CP27) of the PC. If you

use the CP27 cable, install the USB drivers on your PC.

• On the PC, launch a program for serial communication (e.g.

Hyperterminal), set the baud rate to 115200 and the communication

parameters to 8N1.

• Send the commands given in table 8 to set the measurement range

corresponding to the analog outputs.

TAB. 8: conguration serial commands (models with analog output)

Command Response Description

Kn &

Set the unit of measurement of index n

HD402T1 & HD402T2 HD402T3 & HD402T4 &

HD402T5

n=0 →Pa n=0 →kPa

n=1→mmH2O n=1 → mmHg

n=2 →inchH2O n=2 →PSI

n=3 →mbar n=3 →mbar

Rn &

Set the measuring range of index n

n=0 →high range (e.g. 250 Pa / 25 mmH2O / 1“H2O /

2,5 mbar in HD402T1)

n=1 →intermediate range (e.g. 100 Pa / 10 mmH2O / 0,4“H2O

/ 1 mbar in HD402T1)

n=2 →low range (e.g. 50 Pa / 5 mmH2O / 0,2“H2O /

0,5 mbar in HD402T1)

PU & Set the unipolar measuring range (0…+f.s.)

PB & Set the bipolar measuring range (-f.s.…+f.s.)

Sn & Set the response time of index n for the analog outputs

n=0 ⇒0.125 s n=1 ⇒1 s n=2 ⇒2 s n=4 ⇒4 s

U0 & Set the interval 0…20 mA for the analog active current

output

U1 & Set the interval 4…20 mA for the analog active current

output

In order to read the settings of the transmitter, send the commands

described in Table 9.

+Vcc

Iout

Vout

Uscita in

corrente

Uscita in

tensione

Vout

GND

24 Vac

16...40 Vdc

24 Vac

16...40 Vdc

0/4...20 mA

OUT

0...10 V

OUT

TAB. 9: serial commands to read the conguration (models with analog

output)

Command Response Description

See the

example

below

It reads the current conguration of the transmitter.

If the dip switch 1 is OFF, it returns the conguration

set via the serial port. If the dip switch 1 is set to ON, it

returns the conguration set by dip switch

See the

example

below

It reads the conguration set by the serial port

See the

example

below

It reads the conguration set by the dip switch

S? Response

time It reads the response time set for the analog outputs

The commands G0, GF and GS for reading the conguration return a string

consisting of:

• model

• full scale value set for the analog outputs

• polarity of the measuring range (U=unipolar, B=bipolar)

• range of the analog output current (0=0...20mA, 4=4...20 mA)

for example: the string“HD402T2 5.00mbar B40”indicates that the transmitter

model is HD402T2, the full scale set for the analog outputs is 5.00 mbar,

the measuring range is bipolar (-5.00…+5.00 mbar) and the analog current

output type is 4...20 mA. The last character of the string (0 in the example) is a

condential code.

CONFIGURATION OF THE MODELS WITH RS485 MODBUS-RTU OUTPUT

(HD402ST...)

RS485 Modbus address: each transmitter of the network is univocally identied

by an address between 1 and 247. Transmitters having the same address shall

not be present in the network. The transmitter Modbus address is equal to the

sum of the value set with the dip switches 2…6 (value settable from 0 to 31)

and the value set with the serial command WA (value settable from 1 to 216,

default = 1). By setting a dip-switch to ON (upwards), the following values are

added to the address:

Dip-switch

ON 16 8 4 2 1

OFF 00000

Example: if the dip-switches 2 and 4 are set to ON, and the dip-switches 3,5

and 6 are set to OFF, the value set with the dip-switches is 16+4=20. If the value

set with the serial command WA is 1 (default value), the transmitter Modbus

address is 20+1=21.

The dip-switches can be set even if the transmitter is powered, and the change

is eective immediately.

Conguration via the RS485 serial port (models HD402ST…)

The transmitters are preset by the factory. To change the settings, proceed as

follows:

• Connect the transmitter RS485 output to the PC RS232 (through a RS485/

RS232 converter) or USB (through a RS485/USB converter, for example the

RS48 cable) port. If a RS485/USB converter is used, install in the PC the

related USB drivers.

• To enable the conguration mode, set the dip-switch 1 (the one closest to

the terminal block) to ON (upwards), then power the transmitter.

Note: the dip-switch 1 can be changed from OFF to ON even when the

instrument is powered; in this case it is however necessary, after setting

the dip-switch to ON, to press briey (less than 0.5 seconds) the CAL

ZERO button to enable the conguration mode (the transmitter model

information appears on display, if present). Alternatively, power cycle the

transmitter.

• In the PC, run a serial communication software (e.g. Hyperterminal), set the

baud rate to 57600 and the communication parameters to 8N1.

• Send the CAL START command (the command is required to change the

conguratrion; to read the value of the parameters, the command is not

required).

• Send the commands given in table 10 to set or read the conguration

parameters of the transmitter.

TAB. 10: serial commands (models with RS485 Modbus RTU

output)

Command Description

Response time

AVGn

Set the response time of index n for the

measurement

n=0 ⇒0.125 s, n=1 ⇒1 s, n=2 ⇒2 s, n=4 ⇒4 s

AVG? Reads the response time set for the

measurement

Unit of measurement

DU0

Shows pressure in Pa (HD402ST1 and HD402ST2)

or kPa (HD402ST3, HD402ST4 and HD402ST5) on

display

DU1

Shows pressure in mmHO (HD402ST1 and

HD402ST2) or mmHg (HD402ST3, HD402ST4 and

HD402ST5) on display

DU2

Shows pressure in inchHO (HD402ST1 and

HD402ST2) or PSI (HD402ST3, HD402ST4 and

HD402ST5) on display

DU3 Shows pressure in mbar on display

Modbus parameters

WA n...n

Sets the Modbus base address to the value n…n

The value must be between 1 and 216

(default = 1)

Warning: the actual Modbus address of the

transmitter is equal to the base address set

with this command plus the value set with the

dip-switches.

Note: in the reply to the command, the previous

actual address appears; the new address will

appear in the replies to the next commands.

BAUD r...r

Sets the Modbus Baud Rate to the value r…r

The acceptable values are 9600 and 19200

(default = 19200) If the command is sent

without the parameter r…r, the current setting

is obtained

PAR p

Sets the Modbus communication parameters of

index p

p=O ⇒8O1 p=N ⇒8N2 p=E ⇒8E1

If the command is sent without the index p, the

current setting is obtained (default = 8E1).

Note: the replies of the transmitters with RS485 Modbus RTU output always

start with the address of the connected transmitter. For example, sending

the AVG2 command to a transmitter with Modbus address 1, the reply is “001:

averaging = 2 sec”.

To exit the conguration mode after sending the CAL START command, send

the CAL END command (the transmitter automatically exits the conguration

mode after 5 minutes from the last command sent).

MODBUS-RTU MODE

To operate with the Modbus-RTU protocol be sure that the dip-switch 1 (the

one closest to the terminal block) is set to OFF (downwards). The dip-switch

can be set to OFF even if the transmitter is powered, and the change is eective

immediately.

The measured values can be read in Modbus RTU mode by using the 04h

function code (Read Input Registers). Table 11 lists the Modbus Input Registers

available:

TAB. 11: MODBUS Input Registers

number

address Datum Format

4 3 Pressure in tenths of Pa (only

HD402ST1) 16-bit

integer

5 4 Pressure in Pa (only HD402ST1,

HD402ST2 and HD402ST3) 16-bit

integer

6 5 Pressure in daPa (only HD402ST2,

HD402ST3 and HD402ST4) 16-bit

integer

7 6 Pressure in hPa (only HD402ST3,

HD402ST4 and HD402ST5) 16-bit

integer

8 7 Pressure in kPa (only HD402ST4

and HD402ST5) 16-bit

integer

9 8 Pressure in hundredths of

mmHO (only HD402ST1 and

HD402ST2)

16-bit

integer

10 9 Pressure in tenths of mmHO

(only HD402ST1, HD402ST2 and

HD402ST3)

16-bit

integer

11 10 Pressure in mmHO (only

HD402ST2, HD402ST3 and

HD402ST4)

16-bit

integer

12 11 Pressure in thousandths of

inchHO (only HD402ST1 and

HD402ST2)

16-bit

integer

13 12 Pressure in hundredths of

inchHO (only HD402ST2 and

HD402ST3)

16-bit

integer

14 13 Pressure in tenths of inchHO

(only HD402ST3, HD402ST4 and

HD402ST5)

16-bit

integer

15 14 Pressure in inchHO (only

HD402ST4 and HD402ST5) 16-bit

integer

16 15 Pressure in thousandths of

mmHg (only HD402ST2) 16-bit

integer

17 16 Pressure in hundredths of mmHg

(only HD402ST2 and HD402ST3) 16-bit

integer

18 17 Pressure in tenths of mmHg (only

HD402ST3 and HD402ST4) 16-bit

integer

19 18 Pressure in mmHg (only

HD402ST4 and HD402ST5) 16-bit

integer

20 19 Pressure in thousandths of PSI

(only HD402ST3) 16-bit

integer

21 20 Pressure in hundredths of PSI

(only HD402ST3, HD402ST4 and

HD402ST5)

16-bit

integer

27 26 Error register. 16-bit

integer

Reading a register not available for a particular model returns the value -32768

(0x8000).

Error register

The bits of the error register signal, if set to 1, anomalies in the measurement.

The bit 0 (the less signicant one) indicates a measurement over-range of

the transmitter. The bit 1 indicates whether the measurement is less than the

minimum measurable (under-range). The bits 2 and 3 indicate sensor errors.

TAB. 12: MODBUS - Holding Registers

number

address Datum Format

101 100

Modbus base address

(from 1 to 216)

Warning: the actual Modbus

address of the transmitter is

equal to the base address set in

this register plus the value set

with the dip-switches.

16-bit

integer

102 101

Modbus Baud Rate

Acceptable values: 3 (⇒9600)

and 4 (⇒19200)

16-bit

integer

103 102

Modbus communication para-

meters

Acceptable values: 1 (⇒8N2), 2

(⇒8E1) and 4 (⇒8O1)

16-bit

integer

The Modbus Holding Registers allow setting the same Modbus parameters

that can be set via the serial commands WA, BAUD and PAR. Use the 06h

(Write Single Register) and 03h (Read Holding Registers) function codes to

write and read respectively the content of the registers.

To make the changes of the Holding Registers content active and

permanent, write the hexadecimal value FF00 in the Coil Register number

3 (address 2) by using the 05h function code (Write Single Coil).

TAB. 13: MODBUS - Coils

number

address Datum

3 2 Activation and permanent storage of the Hol-

ding Registers content changes.

Display

Models withsuxLare equippedwith a 4-digit LCD display. In modelswith LCD

option, the measuring range shown on the display is always bipolar (-f.s.....+f.s.)

and related to the maximum full scale available in the model (the setting of the

measuring range only aects the behavior of the analog outputs).

The measure on the display is updated twice a second.

Error messages:

Undr → it appears if the measured value is less than the minimum

measurable value

OvEr → it appears if the measured value exceeds the maximum mea-

surable value

CAL Error→ it appears at the end of the zero calibration if the maximum

oset value possible to be corrected is exceeded.

ORDERING CODES

HD402T…: Pressure relative to the atmosphere or dierential pressure

transmitters. For dry air and non-aggressive gases. Barbed connection.

Ø 6.2 mm for tubes with internal Ø 5...6 mm pressure inputs. RS485

Modbus RTU output (HD402ST), voltage 0...10 V or active current 0...20

mA / 4...20 mA analog output (HD402T) or 2-wire (current loop) 4...20

mA analog output (HD402AT). Operating temperature 10...+60 °C.

Power supply: 24Vac or 18...40 Vdc for the models with voltage and

active current analog output, 12...30 Vdc for the models with passive

current analog output and for the models with RS485 Modbus RTU

output.

HD402 T - L

L= with LCD display

Nominal full scale (f.s.):

1= 250 Pa / 25 mmHO / 1 inchHO / 2,5 mbar

2= 1000 Pa / 100 mmHO / 4 inchHO / 10 mbar

3= 10 kPa / 50 mmHg / 1,5 PSI / 100 mbar

4= 100 kPa / 500 mmHg / 15 PSI / 1000 mbar

5= 200 kPa / 1000 mmHg / 30 PSI / 2000 mbar

Output:

Blank = voltage and active current analog output

A= 2-wire (current loop) 4…20 mA output

S= RS485 Modbus-RTU output

HD402TR...SERIES

• Sensor with high accuracy and stability

• Measurement of pressures relative to the atmosphere or dierential

pressures

• Relay switch output

• Front alarm LED and audible alarm

• Settable thresholds, hysteresis and delay

• Auto-zeroing feature in the low range model

• LCD display and 2 conguration keys

Accessories

Included:

•N°1 piece of silicone tubing Ø 5 int./ Ø 8 ext. length 2 m

•N°2 plastic ttings HD434T.5

Upon request:

AP3719: Air inlet for square or cylindrical channel.

AP3721: Air inlet for cylindrical channel, made of plastic.

RS27: RS232 null-modem serial connection cable with 9 poles sub-D 9

female and 3-pole connectors for COM AUX port.

CP27: Serial connection cable with USB connector for PC and 3-pole

connector for COM AUX port. The cable has a built-in USB/RS232

converter and connects the instrument directly to the USB port of the

PC.

Fig. 8: AP3719

duct probe

135

13 31

Ø 4.5

FLOW

Fig. 9: AP3721 duct probe

EXAMPLE OF CONNECTION WITH THE INDICATOR CONTROLLER HD9022

CAL ZERO

LED

COM AUX

1 2 3 4 5 6

DIP SWITCH

1 2 3 4 5 6

Iin

GND

ALARM HI

HD9022

18...40 Vdc

24 Vac

Power supply

Fig. 10: active current output 0…20 or 4…20 mA

CAL ZERO

LED

COM AUX

1 2 3 4 5 6

DIP SWITCH

1 2 3 4 5 6

Vin

GND

ALARM HI

HD9022

24 Vac

Power supply

18...40 Vdc

Fig. 11: voltage output 0…10 Vdc

Fig. 12: 2-wire (current loop) 4…20 mA output

HD402TR…L series

Pressure ON/OFF relay switches

The series of pressure ON/OFF relay switches HD402TR...L is suitable for

controlling the relative pressure with respect to atmosphere or dierential

pressure in the range from ±250 Pa to ±200 kPa.

If the set threshold value is exceeded, the relay switch output is activated,

the front alarm LED lights up and an audible alarm sounds. The alarm can

be congured to be activated when the measurement becomes higher

or lower than the set threshold. 1 or 2-threshold operating modes are

available.

A silicon piezoresistive sensor with high accuracy and temperature

compensation is used, which allows excellent linearity, repeatability and

stability over the time.

The auto-zeroing feature in the low range model (HD402TR1L) allows

stable measurements over the time without the need to recalibrate.

The instruments are equipped with a 4-digit LCD display and dierent units

of measurement can be chosen for each model.

The conguration can be made through the dip switches mounted on the

circuit board (only for the unit of measurement), via the internal buttons or

by connecting the serial port of the instrument to the PC.

Thanks to the particular sensor used, the instruments are insensitive to

orientation and position. Moreover, the high stability of the sensor over the

time and in comparison to the changes in temperature allows eliminating

the operations of maintenance typically required to compensate for the

aging and the deviation of the sensor zero.

The instruments are supplied ready for use and factory calibrated.

Power supply: 24Vac or 15...36 Vdc.

137

Ø 60

Ø42 N° 3x120°

Ø5,5

Technical specications

Sensor Piezoresistive, High stability

Measuring range from 0…50 Pa to 0…200 kPa both relative and dierential

(please refer to table 1)

Resolution Please refer to table 2

Accuracy @ 25 °C

± 1.5% f.s. nominal for HD402TR1L

± 0.75% f.s. nominal for HD402TR2L

± 1% f.s. nominal for HD402TR3L, HD402TR4L and

HD402TR5L

Accuracy @ 0…50 °C

± 3% f.s. nominal for HD402TR1L

± 1% f.s. nominal for HD402TR2L, HD402TR3L, HD402TR4L

and HD402TR5L

Long term stability

(1000 h) @ 25 °C

± 0.5% f.s. nominal for HD402TR1L and HD402TR2L

± 0.35% f.s. nominal for HD402TR3L

± 0.25% f.s. nominal for HD402TR4L and HD402TR5L

Alarm Front LED, internal buzzer, relay switch

Output

SPDT Relay switch

3 A/250 Vac

3 A/30 Vdc resistive load

Connection to pc RS232 serial port Can be connect to a USB port by using

the optional CP27 adapter

Conguration Settable unit of measurement, thresholds, hysteresis, delay

and alarm operation mode

Auto-zero Automatic for HD402TR1L, manual for the other models

Response time 0.5 seconds for the display updating

Overpressure limit

50 kPa for HD402TR1L, HD402TR2L and HD402TR3L

200 kPa for HD402TR4L

400 kPa for HD402TR5L

Compatible media Only air and non-aggressive dry gases

Power supply 24 Vac ± 10% or 15…36 Vdc

Absorption < 1 W @ 24 Vdc

Pressure connection Ø 6.2 mm for tubes with internal Ø 5...6 mm

Electrical

connections

Screw terminal block, max 1.5 mm2 , PG9 cable gland for

the input cable

Operating conditions -10...+60 °C / 0…95% RH

Storage temperature -20...+70 °C

Housing dimensions 80 x 84 x 44 mm

Protection degree IP65

Model Pa kPa mbar mmHO inchHO mmHg PSI

HD402TR1L 250 --- 2.5 25 1--- ---

HD402TR2L 1000 --- 10 100 4--- ---

HD402TR3L --- 10 100 --- --- 50 1.5

HD402TR4L --- 100 1000 --- --- 500 15

HD402TR5L --- 200 2000 --- --- 1000 30

Model Pa kPa mbar mmHO inchHO mmHg PSI

HD402TR1L 0.1 --- 0.001 0.01 0.001 --- ---

HD402TR2L 1--- 0.01 0.1 0.01 --- ---

HD402TR3L --- 0.01 0.1 --- --- 0.01 0.001

HD402TR4L --- 0.1 1 --- --- 0.1 0.01

HD402TR5L --- 0.1 1 --- --- 1 0.01

TAB. 1: full scale values and units of measurement

TAB. 2: resolution

Dimensions

Internal view

ORDERING CODES

HD402TR…L Relative or dierential pressure controller with ON/

OFF relay switch. Range from ±250 Pa to ±200 kPa depending on

model. 4-digit LCD display. User congurable via serial port or internal

buttons. Operating temperature 10...+60 °C. Suitable for measuring

non-corrosive gases or dry air. Ø 6.2 mm for tubes with internal Ø 5...6

mm pressure inputs. Power supply 24 Vac or 15...36 Vdc.

HD402TR L

Range:

1= ± 250 Pa / 25 mmHO / 1 inchHO / 2,5 mbar

2= ± 1000 Pa / 100 mmHO / 4 inchHO / 10 mbar

3= ± 10 kPa / 50 mmHg / 1,5 PSI / 100 mbar

4= ± 100 kPa / 500 mmHg / 15 PSI / 1000 mbar

5= ± 200 kPa / 1000 mmHg / 30 PSI / 2000 mbar

137

Ø 60

Ø42 N° 3x120°

Ø5,5

135

13 31

Ø 4.5

FLOW

AP3719 Flow port for for square or cylindrical duct.

AP3721 Plastic ow port for cylindrical duct.

RS27 RS232 null-modem serial connection cable with SubD 9-pin

connector on the PC side and 3-pole connector on the instrument side.

CP27 Connection cable with built-in USB/RS232 converter. USB con-

nector on the PC side and 3-pole connector on the instrument side.

ELECTRICAL CONNECTIONS

CONFIGURATION

The conguration of the instruments can be done via serial commands by

connecting the instrument serial port to a PC and using a standard serial

communication program, or by using the two internal conguration buttons.

Below are the operating parameters that can be congured:

• Relay operating mode:

Negative: NC contact is closed if no alarm, NO contact is closed if in alarm.

Positive: NO contact is closed if no alarm, NC contact is closed if in alarm.

• Buzzer activation: ON (buzzer enabled) or OFF (buzzer disabled).

• Alarm activation: ON (alarm enabled) or OFF (alarm disabled).

• Alarm operating mode:

Above threshold: alarm is on if measurement is greater than the set

threshold.

Below threshold: alarm is on if measurement is less than the set threshold.

Outside thresholds: alarm is on if measurement is less than lower threshold

or greater than upper threshold.

• Threshold 1: Value of the threshold for above and below alarm operating

modes; value of the lower threshold for outside thresholds alarm operating

mode.

• Threshold 2: Value of the upper threshold for outside thresholds alarm

operating mode.

• Hysteresis: Value of the hysteresis for above and below threshold alarm

operating modes.

• Alarm activation delay: Value in seconds of the time delay for generating

the alarm. The alarm is generated only if the measurement exceeds the

threshold for more than the set time.

• Alarm deactivation delay: Value in seconds of the time delay for

deactivating the alarm. The alarm is deactivated only after the set time has

elapsed from the disappearance of the alarm condition.

Ce manuel convient aux modèles suivants

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