Piezo-Resistive Piezometers

Type of measurements

mA - mV - V - mV/V - °C - Hz (µsec - digit - µε)

A/D converter

24-bit Sigma-Delta ADC (22 true bit)

Range and power supply

·        Current loop (2 wires): range 0÷21 mA - Power supply: 24V DC

·        Transmitter (3 wires): range 0÷21mA - Power supply: 24V DC

·        Voltage (4 wires): range ±10V - Power supply: 24V DC

·        Wheatstone bridge (6 wires): range ±10 mV/V - Power supply: 5 V DC

·        Servo-inclinometer: range ±10000 mV - Power supply: ±12V DC

·        Platinum RTD (Pt100): range -150°C to +150°C - Power supply: 1 mA

·        Thermistor (NTC): range -30°C to +150°C - Power supply: 0.04mA, 0.1mA, 1mA Vibrating Wire: range 400Hz to 6000Hz - Excitation sine wave signal (adaptive): ±10 V

Reading resolution

1µA at FS 20mA - 1µV at FS ±20mV - 10µV at FS ±1V - 100µV at FS ±10V 0.001mV/V at FS 10mV/V - 0.1°C for PT100 - 0.1°C for NTC

0.1 Hz at FS from 400 to 6000Hz

Accuracy

0.01% FS (0.1% for Voltage and Servo-inclinometer, 0.2% FS for PT100 and NTC)

Temperature drift

0.001 % FS / °C

Rechargeable battery

4 x AA, NiMH, 2400 mAh

Operating time

min. 4h (constant use, 24 Vdc @ 20 mA @ 25 °C, maximum backlight, 2400 mAh batteries)

min. 6h (constant use, 24 Vdc @ 20 mA @ 25 °C, 50% backlight, 2400 mAh batteries)

Battery charger

Programmable charger, IP41, input voltage: 100-240 V AC, 50-60 Hz, 1.3A

Display

Amorphous silicon TFT LCD panel with LED backlight unit, 320 x 240, 3.5”, sunlight reliability

ENVIROMENTAL CONDITIONS

Operating temperature

from -20°C to +60°C

Storage temperature

from -30°C to +70°C

PHYSICAL CHARACTERISTICS

Weight

0.5 Kg

Dimensions (L x W x H)

100 x 230 x 45 mm

Protection Degree

IP67

Material

ABS

Connectors

1 x instrument, 1 x battery charger

CERTIFICATIONS

Eletromagnetic compatibility

EN 61326-1 (2006)

Safety requirements

EN 61010-1 (2001)

OMNIALOG GT-2400

OMNIALOG GT-100D

CPU AND MEMORY

Processor

ARM Cortex-M3 MCU with 1 MB Flash, 120 MHz CPU, ART Accelerator, Ethernet

RAM Memory

1 Mbyte RAM with backup

Mass storage

SD CARD 32 GB (*) and WEB pages

Clock accuracy

High precision RTC (real time clock with battery back-up) self compensated in temperature (3ppm @ 25°C, 10ppm @ -30 +70°C)

On-board sensors

Temperature measured on the electronic board (accuracy ±1%)

INPUT

Analog differential inputs

24 differentials individually configured. Channel expansion provided by SISGEO multiplexers

-

INTERFACES

Digital inputs

Two opto-isolated digital inputs individually selectable for switch closure, high frequency pulse and trigger. Independent 32-bit counters for each input. Max Input Voltage: 24V (Max Current: 10mA) Min Input Voltage: 5V (Max Current: 2mA)

Display & Keyboard

Small backlight graphic LCD 128x64 dpi with membrane keyboard for the minimal local management without the PC. Keyboard for start a uniscan, sequential display of the last memorized readings for each channel (sensor ID, converted unit reading, UM), device status, data download and FW/web pages update by USB pen drive, safe mode (back-up/format/restore internal SD card)

LAN ethernet isolated

10/100 Mbps, RJ45

RS232

9-pin, DE9: DCE port for GSM/GPRS modem connection Baud Rates: selectable from 9600 bps to 115.2 kbps (default setting) Default Format: 8 data bits; 1 stop bits; no parity

USB

USB 2.0 flash drive only (FAT 32), 5 V 200 mA

RS485#1 opto-isolated

5 screw clamp: DCE port for max. No.250 SISGEO digital sensors Communication interface: RS485 Communication protocol: MODBUS RTU (SISGEO Protocol) The voltage ‘V OUT’ is 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)

RS485#2 opto-isolated

5 screw clamp: DCE port for max. 16 SISGEO multiplexer boards connection. Communication interface: RS485 Communication protocol: MODBUS RTU (SISGEO Protocol) The voltage ‘V OUT’ is switched on and off under program control. V OUT is the unregulated input power supply ‘V IN’ (1 A) Every channel of each multiplexer board is completely independent.

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)

ANALOG MEASUREMENTS

Measurement rate (MR)

High precision measurement (low speed, 5 sps): Init. analog (with auto-calibration): 27.80 sec Instrument warm-up: depending on sensor configuration Measurement: 5.41 sec Standard measurement (20 sps): Init. analog (with auto-calibration): 7.1 sec Instrument warm-up: depending on sensor configuration Measurement: 1.57 sec Fast measurement (High speed 40 sps): Init. analog (no auto-calibration): 2.65 sec Instrument warm-up: depending on sensor configuration Measurement: 0.45 sec Note1: times indicated not valid for vibrating wire measures Note2: init. analog phase is made only one time before the measurement cycle

-

Type of measurements

mA, mV, V, mV/V, °C, Hz (µsec, digit)

-

ADC

24-bit (22 true bit) differential Analog-to-Digital Converters, 5SPS, 0-24 Average Function, auto-calibration and auto-range

-

Range and power supply

Current loop (2 wires): range 0÷25 mA Power supply (selectable by the software, up to 100 mA): 24V DC, 10V DC, external Transmitter (3-4 wires): range 0÷25mA Power supply (selectable by the software, up to 100 mA): 24V DC, 10V DC, external Voltage (4 wires): range ±100mV, ±1V, ±10V Power supply (selectable by the software, up to 100 mA): 24V DC, 20V DC, 10V DC, 5 V DC ,external Servo inclinometer: range ±5V Power supply (selectable by the software): ±12V DC (dual), external Wheatstone bridge (6 wires, with sensing): range ±10mV/V Power supply (selectable by the software, up to 80 mA): 10 V DC , 5 V DC, external (max 10 Vdc) Maximum bridge resistance: 10 kΩ Minimum bridge resistance: 200 Ω Platinum RTD (Pt100): range -150°C to +150°C Power supply: 1.2 mA Potentiometer: range ±2.5V Power supply (selectable by the software): 10V DC, 5V DC Thermistor (NTC): range -50°C to +150°C Power supply: 0.05mA / 0.1mA / 1.2mA Vibrating Wire: range 400Hz to 6000Hz Excitation sine wave signal (adaptive): ±10 V

-

Reading resolution

1 µA at range 20 mA 10 µV at range ±100 mV - 100 µV at range ±1 V 1 mV at range ±10 V - 0.1 °C for Pt100 - 0.1 °C for NTC 0.1 Hz at range 6000 Hz - 0.001 mV/V at range ±10 mV/V

-

Measurement accuracy

0.01% F.S. (0.1% F.S. for Pt100 and NTC) with Standard Measurement Calibration in Sisgeo laboratories recommended every 2 years

-

Temperature drift

< 10 ppm / °C, range -30°C to +70°C

-

Input noise voltage

5,42 µVpp

-

Input limits

±12V

-

Sustained input voltage w/o damage

±50V DC max

-

DC common mode rejection

>105dB

-

Normal mode rejection

>90dB

-

Input impedance

20 MΩ typical

-

OUTPUT

Digital output

One relay output (for alarm, etc.): volt-free closure (low voltage 30V, 2A)

DIGITAL INPUTS

Measurement rate (MR)

Max frequency 1kHz

Accuracy

0.1 Hz

PROTECTIONS

Electro-mechanical relays for each measuring channel: Electrical endurance: min. 2x105 operations, Mechanical endurance: 10x108 operations. Circuit protection: Gas Discharge Tubes (GDT): DC Breakdown Voltage 75V (± 20%@100V/µs) Impulse Breakdown Voltage 250V (@100V/µs ) typical Overvoltage and reverse polarity protection on power supply input. Short circuit protection on every outputs of sensor power supply.

SYSTEM POWER REQUIREMENTS

Voltage (external power supply)

10 to 30 V DC (reverse polarity protected), max 5 A

External rechargeable batteries

12V DC nominal

Typical current drain

Sleep mode: 100 µA ON: 62 mA - ON with ethernet connected: 87 mA - ON with display ON: 115 mA ON with display ON and ethernet connected: 142 mA Analog initialisation: 115 mA Measurement: 123 mA (with 12 mA @ 24 V sensor consumption)

ENVIROMENTAL CONDITIONS

Operating temperature

-30 to +70°C (display -20 to +70°C)

Storage temperature

-40 to +85°C (display -30 to +80°C)

Humidity

80%

Overvoltage category

II

Pollution degree

2

Sound levels

< 74dBA

Maximum height of use

3000m