Omega 24 Channel Ethernet Data Logger With Embedded Web Server

OM-240 is a versatile, high accuracy “smart” data acquisition system. It provides 24 differential analog inputs, individually configured.

The Data Logger can be used in a wide range of applications, including HVAC, oil and gas, water quality, energy and building monitoring. Using OM-240 requires no additional configuration/analysis software package, as it is provided by an Embedded Web Server. Only a standard Web Browser (Firefox recommended) for configurations and data view. Logged Data is ready to be shown in a graphic “real time” mode (License required) or exported in a CSV file. Channel expansion provided by multiplexers. There are 8 terminal blocks (each terminal block can handle up to 3 sensors). The OM-240 is designed to work with 2 to 6-wire sensors. You can connect 2-wire sensors on each channel and read 24 sensors, or 4-wire sensor and read 12 channels. The system will order sensors depending on how many wires they use, placing 6 wires sensors first, 4 wires in the middle, and 2 wires last.

Once software configuration is done, clicking on “Wiring scheme” button on the web interface near the sensors will show how to connect the chosen sensor to the block physically. It shows “relative” position, so if you start connecting sensors from the first, you will not have to leave “unused” positions (except for the ground connection of every block, if not used). Multiplexers are needed if the total “wires” from sensors exceeds the 48 provided by the OM-240.

Applications including Oil/Gas Pipeline Monitoring, Building/Bridge Structure Health Monitoring, Engine Thermal Mapping Testing, Data Center Environmental Monitoring, and Energy Farm Monitoring, and etc.

Specifications
Weight 980 g (2.16 lb)
Dimensions: 231 L x 138 W x 117 mm H (9.09 x 5.43 x 4.61”)
Material: Plastic and metal
Wiring: Removable screw terminal connectors
MEASUREMENT RATE
Analog Initialization (±10V range):
    Maximum Speed: 1.70 sec
    Standard Speed: 7.10 sec
Instrument Warm-Up: Depends on sensor configuration
Measurement (±10V range:
    Maximum Speed: 80 ms
    Standard Speed: 1.57 sec
Notes: Times indicated are not valid for vibrating wire measures Init analog phase is made only once before measurement cycle
Measure Frequency Selectable (Global or for Each Channel): 1 second up to 1 week
ADC: 24-bit (22 true bit) differential analog-to-digital converters, 5SPS to 1000SPS, 0-24 average function, auto-calibration and auto-range
CPU and MEMORY
Processor: ARM Cortex-M3 MCU with 1 MB Flash, 120 MHz CPU, ART Accelerator, Ethernet
RAM Memor 1 Mbyte RAM
Mass Storage: 2 GB SD card for data (about 5 Mega data points) and Web pages
Clock Accuracy: RTC (real time clock with battery back-up) temperature compensated
On-Board Sensors: Temperature (accuracy ±1%), measured inside the datalogger
Switched Output Power Supply: The voltage ‘V OUT’ is switched on and off under program control. V OUT is the unregulated input power supply ‘V IN’ (2 A Max)
SOFTWARE and FIRMWARE
Web Server on Board: (independent OS platform)
Acquisition Time Interva: Selectable from 1 second up to 1 week (depends on the number of channels acquired)
FTP client: To send data/alarms on an FTP server (SFTP not supported)
MAIL to send data/alarm: To max 5 email address (SMTPS / SSL not supported)
SMS to Send Alarms: To max 5 telephone numbers
Data Download: (measure, logs) in .csv file (compatible with Microsoft Excel)
Virtual Channels Management: For Math operations between channels
ANALOG INPUTS
Thermocouple, RTD (Pt100, Pt200, Pt500, Pt1000), Thermistor, Current Loop, Current Transmitter, Voltage, Servo Inclinometer, Wheatsonte Bridge, Potentiometer, Vibrating Wire
Temperature Drift: < 10 ppm/°C, range -30 to 70°C (-22 to 158ºF)
Input Noise Voltage: 5.42 µV pp
Input Limits: ±12V
DC Common Mode Rejection: >105 dB
Normal Mode Rejection >90 dB
Input Impedance: 20 MΩ typical

THERMOCOUPLES
Thermocouple Types: K, B, J, T, E, R, N, S
Resolution: 1 µV at FS for ±10 mV range;
10 µV at FS for ±100 mV range;
100 µV at FS for ±1 V range;

RTD
RTD Types: Pt100/200/500/1000
Resolution: 0.1°C
Power Supply: 1.2mA

THERMISTOR
Thermistor Type: 3000 O @25°C, NTC
Resolution: 0.1°C
Power Supply: 0.05mA, 0.1mA, 1.2mA

DC VOLTAGE INPUT
Power Supply: 5V, 10V, 20V, 24V DC*

DC CURRENT INPUT
Power Supply: 10V, 24V DC*

WHEATSTONE BRIDGE
Power Supply: 5V, 10V, External (Max 10V)*
Minimum Bridge Resistance: 200 O

DIGITAL I/Os
Digital Output
One relay output (for alarm, etc.): volt-free closure (low voltage 30V, 2A)
Digital Inputs
Two opto-isolated digital inputs individually selectable for switch closure.
Max Input Voltage: 24V (max current: 10mA)
Min Input Voltage: 5V (max current: 2mA)
Measurement Rate: max frequency 1 kHz
Accuracy: 0.1 Hz
PROTECTIONS
Electro-Mechanical Relays for Measuring Each Channel
Electrical Endurance: min 2 x 10⁵ operations
Mechanical Endurance: 100 x 10⁶ operations.
Circuit Protection (Gas Discharge Tubes) DC Breakdown Voltage (@100V/s): 75V
Tolerance of DCBV: ± 20%
Impulse Breakdown Voltage (@100v/µs ): 250V
Impulse Breakdown Voltage (@1kv/µs ): 525V
Overvoltage and Reverse Polarity Protection Short Circuit Protection on Every Output
INTERFACES
Display & Keyboard
Small backlight graphic LCD 128 x 64 dpi with membrane keyboard for the minimal local management without the PC. Keyboard for starting a data acquisition scan, sequential display of the last stored readings for each channel (sensor ID, converted unit reading, unit of measure), device status, data download and firmware/Web pages update by USB pen drive, safe mode (back-up/format/restore internal SD card).
LAN Ethernet
10/100 Mbps, RJ45, Isolated
RS232
9-pin, DE9. DCE port for optional GSM/GPRS modem connection
Baud Rates: selectable from 9600 bps to 115.2 kbps
Default Format: 8 data bits; 1 stop bits; no parity
USB
USB 2.0 pen drive only (FAT 32), 5 V 200 mA
RS485#1 AND RS485#2
Connection: 5 screw clamp port for max. No.254 Modbus RS485 digital bus sensors
Communication Interface: RS485 – Optoisolated
Communication Protocol: MODBUS RTU
Voltage ‘V OUT’: Switched on and off under program control. V OUT is the unregulated input power supply ‘V IN’ (1 A).
Power Supply Management: Always on or energy safe Every channel of each multiplexer board is completely independent.
SYSTEM POWER REQUIREMENTS
Voltage (Power Supply): 10 to 30 Vdc (reverse polarity protected), max 5A
External Rechargeable Batteries: 12 Vdc nominal
Typical Current Drain (@12 Vdc)
Sleep Mode(MAX): 315 µA
ON: 62 mA – ON with Ethernet connected: 87 mA
ON with display: 115 mA
ON with display and ethernet connected: 142 mA
Analog Initialization: 115 mA
Measurement: 123 mA (with 12 mA @ 24 V sensor)
ENVIRONMENTAL CONDITIONS
Operating Temperature: -30 to 60°C (display -20 to 60°C)
Storage Temperature: -40 to 85°C (display -30 to 80°C)
Relative Humidity: 80 %RH
Overvoltage Category: II
Pollution Degree: 2
Sound Levels: < 74 dBA
Maximum Height of Use: 3000 m (9800 ft)