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Summary of Contents for Novus NP785
- Page 1 NP785 Ultra Low Differential Pressure Transmitter INSTRUCTION MANUAL V1.2x Recommended for devices with firmware version up to V 1.2x. 1.800.561.8187 information@itm.com www. .com...
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Page 2: Table Of Contents
SAFETY ALERTS .......................................3 PRESENTATION ........................................4 IDENTIFICATION .......................................5 DEVICE IDENTIFICATION ..................................5 DEVICE MODEL......................................5 INSTALLATION ........................................6 MECHANICAL INSTALLATION ..................................6 4.1.1 DIMENSION ......................................6 ELECTRICAL INSTALLATION ..................................7 4.2.1 RECOMMENDATIONS FOR INSTALLATION ..........................7 4.2.2 SPECIAL PRECAUTION ...................................7 4.2.3 ELECTRICAL CONNECTIONS .................................7 4.2.4 USB CONNECTION ..................................8 CONFIGURATION......................................9 GENERAL SETTINGS ....................................9 ALARM SETTINGS .....................................9... -
Page 3: Safety Alerts
SAFETY ALERTS The symbols below are used in the device and throughout this manual to draw the user’s attention to important information related to device safety and use. CAUTION ATTENTION CAUTION OR HAZARD Read the manual fully before installing and Material sensitive to static charge. -
Page 4: Presentation
PRESENTATION NP785 Ultra Low Differential Pressure Transmitter uses a high precision differential pressure sensor and has the stability required to perform measurements in applications that require high sensitivity. It is a micro processed device with two communication interfaces: USB and RS485 via Modbus RTU protocol. -
Page 5: Identification
Figure 01 shows the information available in the device housing: Figure 1 – NP785 Ultra Low Differential Pressure Transmitter DEVICE MODEL The NP785 Ultra Low Differential Pressure Transmitter line is available in 02 models: Model NP785-05 of ± 5 mbar. • Model NP785-20 of ± 20 mbar. -
Page 6: Installation
INSTALLATION MECHANICAL INSTALLATION NP785 Ultra Low Differential Pressure Transmitter is designed to be fixed on 35 mm DIN rail, as shown in Figure 02. The 35 mm DIN rail installation must be carried out after the device has been configured. -
Page 7: Electrical Installation
When closing the housing, the cover should be placed again properly, ensuring proper sealing for this device. • 4.2.3 ELECTRICAL CONNECTIONS Figure 05 shows the device electrical connections: Figure 5 – NP785 electrical connections Electrical Connection Input ALARM Output OUT (Retransmission) -
Page 8: Usb Connection
4.2.4 USB CONNECTION The USB connection is used exclusively for the device diagnosis and configuration. The USB interface is on the NP785 Ultra Low Differential Pressure Transmitter side. It is recommended that the device be configured before it is attached to the DIN rail. -
Page 9: Configuration
CONFIGURATION NP785 Ultra Low Differential Pressure Transmitter is configurable by any of its interfaces. Due to the ease of use of the interface, it is recommended to configure via USB using the NXperience software, but the device can also be configured via Modbus RTU by writing directly in their configuration registers. -
Page 10: Analog Output Configuration
ANALOG OUTPUT CONFIGURATION The device has a configurable analog output. You can configure it using the NXperience software (check the Output Parameters section), and you can define: the electrical pattern, the error mode, and the excursion range of the pressure to be transmitted. The electrical pattern can be selected between 0-10 V and 4-20 mA modes, and the error mode determines the behavior of the analog output in case of sensor failure, as shown in table below: ERROR MODE... -
Page 11: Usb Interface
For MONITORING, any supervision (SCADA) or laboratory software that supports Modbus RTU communication over a serial communication port can be used. When connected to a computer USB port, NP785 Ultra Low Differential Pressure Transmitter is recognized as a conventional serial port (COM x). -
Page 12: Serial Communication
SERIAL COMMUNICATION NP785 Ultra Low Differential Pressure Transmitter can be recognized on an RS485 network with Modbus RTU protocol as a slave device. All the configurable parameters of the device can be read and/or written via serial communication. The device supports writing in Broadcast mode, using the slave address Modbus 0. - Page 13 Pa: 1 decimal place HR_OUT1_LOW_LIMIT mbar: 3 decimal places HR_OUT1_LOW_LIMIT_H -5 mbar -5 mbar 5 mbar mpsi: 2 decimal -72,52 mpsi -72,52 mpsi 72,52 mpsi places Retransmission lower int_32 -2,007 inH2O -2,007 inH2O 2,007 inH2O inH2O: 3 decimal limit places -50,98 mmH2O -50,98 mmH2O 50,98 mmH2O...
- Page 14 * Check the Table 10 for more information about the device configuration registers. Table 5 – NP785-05 Model: Configuration Registers Table The registers 103 to 106, 123 to 126, 157 and 158 must be used by the user to enter the values of their respective parameters. If they are within limits, the device will automatically pass these values to registers 108 to 111, 132 to 135, 159 and 160, which show the values considered during the operation.
- Page 15 3 decimal int_32 -8,029 inH2O 8,029 inH2O pressure value logged places HR_PRESS_MAX_H -203,94 mmH2O 203,94 mmH2O mmH2O: 2 decimal -2000,0 Pa 2000,0 Pa places Pa: 1 decimal place Table 7 – NP785-20 Model:16:30 Output Registers Table 1.800.561.8187 information@itm.com www. .com...
- Page 16 NP785 MODEL: CONFIGURATION REGISTERS TABLE Address Name Description Type Standard Min. Max. Decimal Places Sensor type: 5 mbar or HR_SENSOR_TYPE uint16 N.A. 20 mbar Retransmission output HR_OUT1_TYPE uint16 N.A. type* mbar: 3 decimal places HR_OUT1_IN_HIGH_LIMIT 20 mbar -20 mbar 20 mbar...
- Page 17 * Check the Table 10 for more information about the device configuration registers. Table 8 – NP785 Model: Configuration Registers Table The registers 103 to 106, 123 to 126, 157 and 158 must be used by the user to enter the values of their respective parameters. If they are within limits, the device will automatically pass these values to registers 108 to 111, 132 to 135, 159 and 160, which show the values considered during the operation.
- Page 18 Pa: 1 decimal place * Check the Table 11 for more information about the device configuration registers. Table 9 – NP785-20 Model: Information Registers Table 10 lists the device configuration registers and the captions for their respective values: REGISTER...
- Page 19 Parity: No parity HR_PRTY Parity: Odd parity Parity: Even parity Table 10 – Subtitle Table 11 shows the diagnostic bits: REGISTER NAME DESCRIPTION DIAG_RESTART_UNITS_ERROR Units Configuration error. DIAG_OUT1_OVERLOAD Alarm output overload detection. DIAG_ALM1_OUT_STATUS Forced alarm status. HR_DIAGNOSE01 DIAG_ALM1_STATUS Alarm status. DIAG_FORCE_ALM1 Forced alarm function is enabled.
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Page 20: Nxperience Software
Figure 8 – NXperience home screen To communicate with the software, you must connect the NP785 Ultra Low Differential Pressure Transmitter to the computer and with the previously installed USB drivers. Then you can click on Configure or Diagnostic. The Download option is not available for this device model. -
Page 21: General Parameters
Serial Number, Firmware Version and Model are non-editable parameters that are read by the software directly from the device. For NP785 Ultra Low Differential Pressure Transmitter to be recognized on a Modbus network, you must assign a unique Modbus Address on the network and configure the communication Baud Rate and Parity. -
Page 22: Input Parameters
8.3.2 INPUT PARAMETERS By clicking on the icon, you can configure the pressure sensor input. Figure 13 – Input configuration screen In the Unit parameter, you can select the unit mbar, mpsi, inH2O, mmH2O or pascal. By factory default, the device is configured as mbar. The Pressure parameter informs the differential pressure of the device when the window is opened. -
Page 23: Transmission Output Configuration
8.3.3.1 TRANSMISSION OUTPUT CONFIGURATION Figure 15 – Output The Measurement parameter allows you to read the differential pressure magnitude. The analog output Mode allows you to select the electrical standard to be used for transmission: 0-10 V or 4-20 mA. The electrical signal of the output will be proportional to the selected magnitude, respecting the values configured in the Lower Limit and Upper Limit parameters. -
Page 24: Finalization
8.3.4 FINALIZATION By clicking on the icon, you can send the configuration to the device, save the configurations in a file, update the firmware, and configure a password to protect it. Figure 17 – Finalization parameters 8.3.5 DIAGNOSTICS To access this feature, you must connect the device to the USB port and select the Diagnostics option from the NXperience home screen. Thus, it is possible to analyze the operation of the device by forcing the pressure readings. - Page 25 To force a value at a transmission analog output, use the slider or type de desired value directly into the edit field and then press the button From this moment, NP785 Ultra Low Differential Pressure Transmitter will force the adjusted value into the transmission output and the button used to perform the forcing will change to .
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Page 26: Technical Specification
TECHNICAL SPECIFICATION NP785-05 MODEL NP785-20 MODEL Measuring Range -5 to 5 mbar -20 to 20 mbar Burst Pressure 200 mbar 400 mbar Proof Pressure* 100 mbar 300 mbar Accuracy 1 % of maximum range F.S.** 1 % of maximum range F.S.** 7.630E-4 mbar...
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