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Summary of Contents for Novus NP785-50
- Page 1 NP785 Ultra Low Differential Pressure Transmitter INSTRUCTION MANUAL V 2.0x Recommended for devices with firmware version V 2.0x and higher. NOVUS AUTOMATION 1/25...
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Page 2: Table Of Contents
CONFIGURING WITH NXPERIENCE ..............................17 8.3.1 GENERAL PARAMETERS ................................18 8.3.2 INPUT PARAMETERS ..................................19 8.3.3 OUTPUT PARAMETERS ................................19 8.3.3.1 RETRANSMISSION OUTPUT CONFIGURATION ........................20 8.3.3.2 ALARM OUTPUT CONFIGURATION ............................20 8.3.4 FINALIZATION ....................................21 8.3.5 DIAGNOSTICS ....................................21 TECHNICAL SPECIFICATION ..................................23 WARRANTY ........................................25 NOVUS AUTOMATION 2/25... -
Page 3: Safety Alerts
All safety recommendations appearing in this manual must be followed to ensure personal safety and prevent damage to the instrument or system. If the instrument is used in a manner other than that specified in this manual, the device’s safety protections may not be effective. NOVUS AUTOMATION 3/25... -
Page 4: Presentation
NP785 Ultra Low Differential Pressure Transmitter is suitable for use in HVAC applications such as environmental monitoring or climate control or environmental monitoring of industrial processes where high accuracy is required at low pressure ranges. NOVUS AUTOMATION 4/25... -
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 07 models: NP785-50 of ± 50 Pa; • NP785-100 of ± 100 Pa •... - Page 6 -40000 40000 42504,0 × -1062,600 -1025,000 -1000 1000 1062,600 mbar -15939,00 -15375,00 -15000 15000 15939,00 mpsi 1000 mbar -425,040 -410,000 -400 425,040 inH2O -11157,30 -10762,50 -10500 10500 11157,30 mmH2O -109872,8 -105985,0 -103400 103400 109872,8 NP785 measuring ranges NOVUS AUTOMATION 6/25...
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Page 7: Installation
Overpressure: Excessive pressure, which exceeds the NP785 Ultra Low Differential Pressure Transmitter capacity, can cause irreversible mechanical and electrical damage to the device. To avoid damaging the operator or the device installer, follow the installation instructions and use the appropriate protection and device. NOVUS AUTOMATION 7/25... -
Page 8: Dimension
Remember to pass all wires through a cable clip before completing electrical connections. • 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 – Electrical connections NOVUS AUTOMATION 8/25... -
Page 9: Usb Connection
LED flashing quickly: The measured pressure is outside the configured relay limits. • One long flash: The Auto-Zero function has been performed successfully. • Three short flashes: The Auto-Zero function was not performed. • LED off: There was an error in the device. • NOVUS AUTOMATION 9/25... -
Page 10: Settings
Extra-range mode is the default mode of alarm output. The default values of the set points, in turn, are the operating limits of the device. Any changes in the pressure unit configuration readjust the values of the set points to the operating limits. NOVUS AUTOMATION 10/25... -
Page 11: Analog Output Configuration
The device leaves the factory with the 4-20 mA electrical standard and with the pressure unit configured according to the selected model (see Table 01). Any changes in the pressure unit configuration readjust the values of the transmission limits to the device operating limits. NOVUS AUTOMATION 11/25... -
Page 12: Usb Interface
In any other situation, the USB interface use is possible, but requires a careful analysis by the person responsible for its installation. For MONITORING for long periods and with inputs and outputs connected, it is recommended to use the RS485, available or optional in most of our device. NOVUS AUTOMATION 12/25... -
Page 13: Serial Communication
HR_OUT1_LOW_LIMIT Retransmission lower limit Depends on model and unit of measure selected¹ HR_OUT1_LOW_LIMIT_H ¹ Maximum and minimum values according to Table 01. ² Output behavior in case of error according to Table 04. Analog output transmission registers NOVUS AUTOMATION 13/25... - Page 14 Baud Rate 4 → 19200 5 → 38400 6 → 57600 7 → 115200 0 → No parity HR_PRTY Parity 1 → Odd parity 2 → Even parity HR_ADDR Slave Address Modbus RS485 communication port configuration registers NOVUS AUTOMATION 14/25...
- Page 15 For 32-bit data, the two registers that compose them must be read and/or written for the values to be updated. DIAGNOSTIC REGISTERS Address Register Description Type Unit configuration error Overload detection at alarm output HR_DIAGNOSE01 Forced alarm status Alarm status Alarm forcing is enabled NOVUS AUTOMATION 15/25...
- Page 16 Minimum Maximum HR_PRESS_HIGH_LIMIT Depends on model and unit of measure Maximum limit selected¹ HR_PRESS_HIGH_LIMIT_H HR_PRESS_LOW_LIMIT Depends on model and unit of measure Minimum limit selected¹ HR_PRESS_LOW_LIMIT_H ¹ Maximum and minimum values according to Table 01. Limit registers NOVUS AUTOMATION 16/25...
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Page 17: Nxperience Software
The Create Configuration button creates a configuration from scratch, without needing the device. This configuration can be saved in a file for future use or can be recorded to a connected device. The Open Configuration button reads a configuration file already created. NOVUS AUTOMATION 17/25... -
Page 18: 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. NOVUS AUTOMATION 18/25... -
Page 19: Input Parameters
Offset means that the output will remain at 2. If you select the option to reset the Offset to zero, the output will remain at 0. 8.3.3 OUTPUT PARAMETERS By clicking on the icon, you can configure the transmission analog output and the alarm output. Figure 15 – Output configuration screen NOVUS AUTOMATION 19/25... -
Page 20: Retransmission Output Configuration
Upper Limit and Lower Limit are the differential pressure values that act as alarm activation conditions that, together with the Hysteresis, define the barrier to be exceeded so that the channel exits the alarm situation. For more information about the alarm configuration, see Alarm Configuration section. NOVUS AUTOMATION 20/25... -
Page 21: Finalization
In output diagnostics, on the other hand, you can monitor the value of the analog output in real time or force a value. This interface depends on the type of analog output configured (0-10 V or 4-20 mA) and will be adjusted automatically. NOVUS AUTOMATION 21/25... - Page 22 The images below show the alarm output forcing interface in the three possible conditions: No forcing, forcing on status, and forcing off status. Figure 22 – Alarm output without forcing Figure 23 – Alarm output with forcing on status Figure 24 – Alarm output with forcing off status NOVUS AUTOMATION 22/25...
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Page 23: Technical Specification
This is a Class A product. In a domestic environment, this product may cause radio interference in which case the user may be required to take adequate measures. * Proof Pressure: The maximum pressure that the device can be subjected to and still perform within specifications after returning to operating range. NOVUS AUTOMATION 23/25... - Page 24 ***** The resolution shown corresponds to the digital values read from registers 0 to 5 and is lower than the sensor resolution due to the limitation of decimal places. The digital values read from registers 6 to 11 have the same resolution as the sensor. Technical specifications NOVUS AUTOMATION 24/25...
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Page 25: Warranty
10 WARRANTY Warranty conditions are available on our website www.novusautomation.com/warranty. NOVUS AUTOMATION 25/25...
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