NÅNO Flow Computer

Digital Status Inputs – 9 off

• Individually opto-isolated inputs
• Maximum input voltage = 32 V
• Minimum input on voltage = 10 V
• Maximum input off voltage = 3 V
• Input impedance 2 kΩ typical
• Protection surge and reverse voltage protection
• Fleeting input detection

Digital Status Outputs – 8 off

• Individually optically isolated
• Maximum output current = 100 mA
• Maximum output saturation voltage = 2.1 V @ 100 mA
• Maximum output standoff voltage = 32 V, limited by input protection
• When powered off or reset, all digital outputs are OFF
• Two outputs can be used as pulse outputs or PWM outputs
• Frequency range is DC to 500 Hz
• PWM mode 0% to 100% in 0.2% steps

Meter Pulse Inputs & Period Measurement – 4 off

• Inputs can use differential or single ended inputs
• Inputs are individually opto-coupled
• Input signal levels from ±3.5 V to ±24 V
• Input current minimum = 2.5 mA
• Input impedance = 1 kΩ
• Frequency range from DC to 10 kHz
• Inputs A & B feature back-to-back optos, allowing full quiescent line and electronic integrity testing, when used with differential pre‑amps such as the ST106
• Dual Pulse compliant inputs A & B support IP 252/76, ISO6551 or API Ch 5.5 level A or B, with line integrity, even when static
• Accuracy of period measurement = 2.5 ppm
• Period resolution = 5 ns

Raw Pulse Bus

• Digital ground referenced differential transceiver
• Enable & direction software controlled
• Used to bus together multiple streams to a common prover
• RS422 compatible drive & receive levels
• Maximum output frequency 10 kHz

Alarm Relay

• The relay used for the Gen3 hardware is a PhotoMOS solid state change-over relay
• Both Form A (Normally Open) & Form B (Normally Closed) outputs provided
• Maximum current 1 A (de-rated to 0.5 A for operation above 75 °C ambient)
• Maximum voltage 32 V, limited by input protection
• Isolation = 100 V
• Released on de-power, watchdog restart or software command

Analogue Inputs – 6 off

• Type of inputs: 1 to 5 Volt or 4-20 mA, differential inputs
• All channels individually isolated to 50 V RMS in voltage and current input mode
• Conversion Method: 24 bit Sigma-Delta ADC
• Effective resolution: More than 18 bits, auto zero, auto calibrate
• Conversion time: Less than 100 ms per channel
• All channels can be acquired simultaneously
• Series mode rejection: >100 dB at 50 Hz and 60 Hz
• Voltage common mode range: ±50 V relative to computer ground or other input

RTD Inputs – 2 off

• 4 wire Kelvin connection using Pt100 RTD
• Temperature measuring range: -100 °C to +300 °C
• Resolution: 0.01 °C
• Accuracy: ±0.05 °C, -100 °C to +200 °C and ±0.1 °C, +200 °C to +300 °C
• PRT cables loop resistance up to 600 Ω
• Continuous cable integrity tests for excitation current and voltages allow open and short circuit detection
• RTD current sources 1 mA nominal
• 3 wire mode not supported
• Each RTD uses one analog input channel

Analogue Outputs – 2 off

• Each channel is individually isolated
• Current controlled 0 to 24 mA
• Can be used to sink or source power
• Resolution: 14 bits
• Accuracy: ±0.1% at 23 °C
• Temperature Coefficient: 10 ppm / °C
• Minimum load loop resistance: Safe down to 0 Ω from +32 V external supply
• Maximum load loop resistance: 1 kΩ when powered from +24 V external
• Maximum external supply: 32 V
• Output form: Isolated active current controller
• Number of field connections: 2 terminals per channel
• Update time: 500 ms to within 1%

Mechanical

• Length on Rail: 188mm
• Height: 56mm
• Width across Rail: 134mm
• Weight: 650 grams
• Structure: PVC extrusion with stainless steel lid
• Mounting: 35mm symmetrical Top Hat rail to EN50022 and asymmetric G-type rail to EN50035

Environmental

• -40°C to +85°C operating temperature range
• -25°C to +55°C for MID certified installations
• -60°C to +100°C storage (without integral display)
• Humidity: Up to 95% non-condensing
• Safety classification: For use in a safe area
• High vibration tolerance due to robust mechanical design

Input Power

• Input Voltage & Current: 11.5V to 30V DC, 4.5W nominal, 6W max
• Suitable for 12V Solar powered systems
• Digital only version is typically 3 Watts
• DC Inputs: 2 off, allowing direct connection to redundant supplies
• Galvanic isolation: Minimum of 50V RMS to Instrument Ground
• Input Ripple: Maximum 2V peak to peak
• Input protection: Non-replaceable 1A input fuse

Clock

• Accuracy Powered-Off
  • Capacitor supported calendar better than 10 Seconds per day
  • Ensures logs and reports are in sequential time/date order following a power interruption
  • NOTE: Capacitor only supports up to 2 days powered off before clock is reset to last know power-off time
• Accuracy Powered-On
  • 0.5 Seconds per day over full temperature range

Processor & Memory

• CPU: 800 MHz ARM Cortex-A8 highly integrated SoC processor system
• Memory
  • SRAM: Not required, by design, no batteries needed.
  • FRAM: 128 KBytes or 512 KBytes
  • NOR: Flash 128 MBytes
  • DRAM: 256 MBytes, DDR3 with 400MHz bus interface
• Silicon Serial No: Globally unique 48 bit address and 2 Kbit EEPROM, 200 year retention

Communications

• Four Serial ports
  • 1 x RS232
    Signals: TX, RX, RTS, CTS, GND
  • 1 x RS485 (2-wire), galvanically isolated
    Signals: A, B, Screen
  • 2 x RS422/RS485 (2-wire and 4-wire)
    Signals: TX+, TX-, RX+, RX-, Screen
• Two Ethernet ports supporting 10/100MHz half & full duplex

Approvals

• MID certified by both NMi and NMRO
• OIML R117 Certified
• EMC Directive 2014/30/EU
• EU 2015/863 RoHS-3 directive
• ISO9001 and AS9100 approved electronics manufacturers
• Conflict Minerals compliant with RMI2020 and EU ‘Conflict Minerals’ Regulation (2017/821)

General

• State-machine architecture based on a 500 ms application cycle time
• Report storage
  • 6 zones, each with 1500 report slots
  • 10 zones, each with 250 report slots
• Flexible report routing to send reports to printer(s), FTP and/or SD card
• Alarm log storage
  • Set, Clear & Accept logged separately
  • 1500 log entries
• Event log storage
  • System (1500 log entries)
  • Operator (2500 log entries)
  • Metrology (1500 log entries)
  • Security (1500 log entries)
  • Application (1500 log entries)
• ALV (Additional Log Values)
  • Each Alarm or Event entry can also contain a snapshot of up-to 13 data-points
  • Useful for diagnostics, debugging or forensic analysis
• Data Logging facility (aka “Historicals”)
  • Each data record supports up to 13 data-points
  • 3 “non-volatile” storage zones with 20,000 record slots
  • 1 further “volatile” zone with 86,400 record slots allowing logging every ½ second for 24 hours
  • Data can be downloaded as a TSV file
• Support for three printers:
  • Printer #1 : Serial (CP437) or Networked
  • Printer #2 : Networked only
  • Printer #3 : Networked only

Integrated Web Server

• View and download Reports, Alarms & Events using Calendar View
  • Download Reports as Text or PDF
  • Download Alarms & Events as TSV
• View and download “historicals” data
• Configure Date & Time manually or via NTP
• Support for Time Zones
• Support for Daylight Saving Time
• Local Panel mimic for remote support
• Browse contents of local SD card
• Configure Printer settings
• Configure Network settings