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HD404…

 

-   2   -

  

V1.2

 

TABLE OF CONTENTS 

1

 

INTRODUCTION .................................................................................................... 3

 

2

 

TECHNICAL CHARACTERISTICS ............................................................................ 5

 

3

 

INSTALLATION ..................................................................................................... 8

 

3.1

 

E

LECTRICAL CONNECTIONS

 ................................................................................... 10

 

3.2

 

E

XAMPLE OF CONNECTION TO A 

P

ITOT TUBE

 ................................................................ 11

 

3.3

 

E

XAMPLES OF CONNECTION WITH 

HD9022

 INDICATOR

/

REGULATOR

 ................................... 12

 

4

 

CONFIGURATION ................................................................................................ 13

 

4.1

 

C

ONFIGURATION OF THE MODELS WITH ANALOG OUTPUT 

(HD404T…) ................................ 13

 

4.2

 

C

ONFIGURATION OF THE MODELS WITH 

RS485

 OUTPUT 

(HD404ST…) ............................... 15

 

4.3

 

N

OTES ON THE CONFIGURATION OF THE MODELS WITH 

SR

 OPTION

 ..................................... 17

 

4.4

 

E

RROR MESSAGES ON DISPLAY

 ............................................................................... 17

 

5

 

MODBUS-RTU PROTOCOL (HD404ST…) .............................................................. 18

 

6

 

INSTRUMENT STORAGE ...................................................................................... 20

 

7

 

SAFETY INSTRUCTION ........................................................................................ 20

 

8

 

ACCESSORIES ORDERING CODES ....................................................................... 21

 

Summary of Contents for Delta OHM HD404 Series

Page 1: ...Operating manual Low pressure transmitters HD404 series www deltaohm com English Keep for future reference ...

Page 2: ...ECTION WITH HD9022 INDICATOR REGULATOR 12 4 CONFIGURATION 13 4 1 CONFIGURATION OF THE MODELS WITH ANALOG OUTPUT HD404T 13 4 2 CONFIGURATION OF THE MODELS WITH RS485 OUTPUT HD404ST 15 4 3 NOTES ON THE CONFIGURATION OF THE MODELS WITH SR OPTION 17 4 4 ERROR MESSAGES ON DISPLAY 17 5 MODBUS RTU PROTOCOL HD404ST 18 6 INSTRUMENT STORAGE 20 7 SAFETY INSTRUCTION 20 8 ACCESSORIES ORDERING CODES 21 ...

Page 3: ...o circuit AZ periodically equalizes the differential pressure at the sensor input and corrects the offset the transmitters equipped with this circuit are in sensitive to the mounting position In addition the auto zero circuit compensates the sensor aging and deviation of the zero with temperature changes eliminating the maintenance The display option L is available in which the pressure is visuali...

Page 4: ...essure with respect to the atmosphere 0 f s Nominal full scale f s 1P 100 Pa 2P 250 Pa 3P 500 Pa 4P 1000 Pa 1M 10 mmH2O 2M 25 mmH2O 3M 50 mmH2O 4M 100 mmH2O 1I 0 4 H2O 2I 0 8 H2O 3I 2 H2O 4I 4 H2O Models with RS485 Modbus RTU output HD404ST pressure output SR speed output without LCD L with LCD without auto zero circuit only HD404ST4 and HD404ST5 AZ with auto zero circuit Nominal full scale f s 2 ...

Page 5: ...ith dip switch set to LOW Configurable 1 2 or 4 s default 2 s HD404ST Configurable 0 125 1 2 or 4 s default 2 s Overpressure limit 50 kPa Connection to PC HD404T RS232 serial port Can be connect to a USB port by using the optional CP27 adapter HD404ST Can be connect to a USB port by using the optional RS48 adapter Zero calibration Automatic for the versions with AZ option Compatible media Only air...

Page 6: ...asure 0 05 0 02 HD404T2MGAZ 0 10 0 25 HD404T3MG 0 25 0 50 1 f s nom 0 8 HD404T4MG 0 50 0 100 HD404T1MDAZ 5 10 HD404T2MDAZ 10 25 HD404T3MD 25 50 1 f s nom 0 8 HD404T4MD 50 100 inchH2O HD404TxI HD404T1IGAZ 0 0 2 0 0 4 0 8 measure 0 002 0 0008 HD404T2IGAZ 0 0 4 0 1 HD404T3IG 0 1 0 2 1 f s nom 0 04 HD404T4IG 0 2 0 4 HD404T1IDAZ 0 2 0 4 HD404T2IDAZ 0 4 1 HD404T3ID 1 2 1 f s nom 0 04 HD404T4ID 2 4 MODEL...

Page 7: ... the factory default values o K 1 0 Tube coefficient o T 16 0 C Air flow temperature o Patm 1013 25 mbar Barometric pressure o Ps 0 Differential static pressure equal to the difference between the absolute static pressure inside the duct and the barometric pressure Ps is zero if the duct is open in contact with the atmosphere Ps can be different from zero if the duct is closed In the models HD404T...

Page 8: ...HD404 8 V1 2 Change of the max speed with the barometric pressure at constant temperature DIMENSIONS mm ...

Page 9: ...trument directly to a panel or to the wall Internally there are the terminal header for connecting the power supply and the output the RS232 serial connector COM AUX except HD404ST the dip switches for quick configuration The CAL ZERO button Models with active analog output HD404T Models with digital RS485 output HD404ST ...

Page 10: ...at least once a year under normal operating conditions In models with AZ option the zeroing is performed hourly During the zeroing which takes about 4 seconds the output and the display remain frozen at the last measured value 3 1 ELECTRICAL CONNECTIONS Current analog output Voltage analog output RS485 connection In the RS485 connection the instruments are connected in a sequence through a shielde...

Page 11: ...he 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 fol lowing features Characteristic impedance 120 ohm Capacity less than 50pF m Resistance less than 100 ohm km Gauge 0 22 mm2 AWG24 at least The cable maximum length depends on baud rate...

Page 12: ...HD404 12 V1 2 3 3 EXAMPLES OF CONNECTION WITH HD9022 INDICATOR REGULATOR 4 20 mA current output 0 10 Vdc voltage output Power supply Power supply ...

Page 13: ...hange the display configuration or the operating mode commands O3E O3D O4E O4D O5E O5D O6E O6D O7E O7D O8E O8D it is necessary to send the CAL START command to enter the configuration mode It is not neces sary to send the CAL START command to change the parameters related to the speed measurement tube coefficient temperature pressure full scale for the analog output Send the commands given in tabl...

Page 14: ...C and 2000 200 0 C RT n Reads the value of the temperature in tenths of C set in the transmitter CP nnnn Sets the differential static pressure see note 2 in mbar default 0 RP nnnn Reads the value of the differential static pressure set in the transmitter CS nnnn In speed mode sets the full scale speed in hundredths of m s for the analog output default see table The max settable value is 10000 100 ...

Page 15: ...r is used install in the PC the related USB drivers To enable the configuration 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 instru ment is powered in this case it is however necessary after setting the dip switch to ON to press briefly less than 0 5 seconds the CAL ZERO bu...

Page 16: ...tial static pressure see note 2 in Pa default 0 RP Reads the value of the differential static pressure set in the transmitter Auto zero ZFn Sets the auto zero interval of index n only in the versions with AZ option n 0 disabled n 1 5 min n 2 10 min n 3 20 minn 4 30 min n 5 60 min Default 60 min ZF Reads the auto zero interval set only in the versions with AZ option Modbus parameters WA n n Sets th...

Page 17: ...n is used If a more uniform speed change on display is desired enable the automatic speed resolution change as a function of the measured value serial command O4E in the models HD404T serial command OPT4E in the models HD404ST Flow measurement the transmitter can be set in flow measurement mode serial command O7E in the models HD404T serial command DUF in the models HD404ST The flow is calculated ...

Page 18: ...e in hundredths of inchH2O only HD404ST4 16 bit integer 13 Pressure in tenths of inchH2O only HD404ST4 without AZ option and HD404ST5 16 bit integer 14 Pressure in inchH2O only HD404ST5 16 bit integer 15 Pressure in thousandths of mmHg only HD404ST4AZ 16 bit integer 16 Pressure in hundredths of mmHg only HD404ST4 16 bit integer 17 Pressure in tenths of mmHg only HD404ST4 without AZ option and HD40...

Page 19: ... switches 16 bit integer 101 Modbus Baud Rate Acceptable values 3 9600 and 4 19200 16 bit integer 102 Modbus communication parameters 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 wr...

Page 20: ...ry use and has left the factory in perfect safety tech nical conditions The instrument proper operation and operating safety can be ensured only if all standard safety measures as well as the specific measures described in this manual are followed The instrument proper operation and operating safety can be ensured only in the cli matic conditions specified in this manual Do not use the instruments...

Page 21: ...able with built in USB RS232 converter USB connector on the PC side and 3 pole connector on the instrument side RS48 Cable for RS485 connection with built in USB RS485 converter The cable has USB connector for PC and 3 separate wires for the instruments AP3719 Flow port for square or cylindrical duct Supplied with two pieces of silicone tube internal Ø 4 mm external Ø 6 mm length 1 m AP3721 Plasti...

Page 22: ...3 1 6 300 30 72 0 600 C AISI 316 T2 400 5 2 8 400 45 120 T3 800 8 3 2 8 800 192 T3 800TC 8 3 2 8 800 192 TC K For other dimensions please contact Delta OHM sales deltaohm com PW K thermocouple extension cable Length 2 m miniature connector For Pitot tubes with K thermocouple sensor Delta OHM metrology laboratories LAT N 124 are ISO IEC 17025 accredited by ACCREDIA for Temperature Humidity Pressure...

Page 23: ......

Page 24: ... warranty included in the manual of the product For any dispute the competent court is the Court of Padua The Italian law and the Convention on Contracts for the International Sales of Goods apply TECHNICAL INFORMATION The quality level of our instruments is the result of the continuous product development This may lead to differences between the information reported in the manual and the instrume...

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