360° Digital MEMS Tiltmeter

The 360° Digital MEMS Tiltmeter is a high-precision instrument designed for structural health monitoring. It features 360° calibration across three axes, ensuring accurate measurements regardless of installation orientation.

This MEMS tilt sensor offers exceptional performance, low thermal drift, and is used for structural health monitoring (e.g. – tilting in buildings, bridges, dams & tunnels) and for monitoring stability of structures nearby underground excavations. It provides data transparency with outputs for temperature, voltage, and gravity acceleration, with RS485 and Modbus RTU compatibility.

For data collection, 360° MEMS tiltmeter offers various reading options: local reading via the MIND portable readout, a wireless connection using the WR-Log node, or centralized data collection with the OMNIAlog datalogger for remote monitoring. The tiltmeter supports wireless communication, ideal for monitoring embankments, slopes, tunnels, and infrastructure projects.

Typically, the user should select bill of materials based on deployment scenario:

1. MEMS Tiltmeter Sensor: High-accuracy sensor measuring inclination along three axes.

2. MIND Portable Readout: A compact, multichannel readout unit for local readings of Sisgeo instruments.

3. WR-Log Wireless Node: Wireless data transmission and remote monitoring through the node.

4. OMNIAlog Datalogger: Centralized data collection for remote monitoring and analysis.

5. Protective Housing: To safeguard the tiltmeters in harsh conditions (specific housing may be needed based on environment).

Working Principle of 360° Tiltmeter:

A 360° tiltmeter utilizes a triaxial MEMS accelerometer to measure tilt by detecting accelerations along three axes: x, y, and z. The accelerations on these axes are used to calculate the tilts of a structure. When installed on different surfaces, the MEMS sensor aligns with the structure’s orientation, with each axis measuring rotations on specific planes (ZY, XZ, YX). For vertical or horizontal installations, the tiltmeter outputs data from specific channels—channels 1, 2, and 3—based on the plane rotations (ZY, XZ, YX). Additionally, channels 4, 5, and 6 measure inclinations with respect to gravity. The system's design ensures precise monitoring without the need for complex positioning, enabling accurate tilt measurements across a 360° range.

Applications of the 360° Digital MEMS Tiltmeter

Structural Health Monitoring (SHM)

Install on buildings to check safety, adjacent to excavation locations.

Historical buildings.

Diaphragms & retaining walls (Detect deformation over time).

Mining (Measure ground shifts).

Features

The key features of the 360° Digital MEMS Tiltmeter:

360° Calibration
High Accuracy
Multiple Reading Options
Data Transparency
MEMS Accelerometer
Versatility
Modbus RTU Compatibility

Specification

TECHNICAL SPECIFICATIONS

PRODUCT CODES	0S543HD3600
Measurement principle	Triaxial MEMS accelerometer
Measuring range	360° (±180°) on all three axes
Repeatability	<± 0.001°
Resolution	0.0001°
Sensor mechanical bandwidth	1 Hz
Stability @ 24 hours	<± 0.004°
MPE Accuracy	<±0.02° (<±0.0055% FSR @360°)
Offset temperature dependency	±0.002° / °C
Power supply	from 8 to 28 Vdc
Signal output and protocol	RS485, Modbus RTU
Average consumption	3.7 mA @ 24 Vdc, 7.0 mA @ 12 Vdc
Temperature operating range	from -30°C to +70°C
Internal temperature sensor - measuring range - accuracy (resolution)	Embedded on electronic board - 40°C to +125°C ±1°C with temperature range -10°C to +85°C (res. 0.01 °C)
Internal humidity sensor - measuring range - accuracy (resolution)	Embedded on electronic board 0 to 100% RH ±5% RH with humidity range 0 to 95% RH (res. 0.025% RH)
On-board supply voltage monitor - measuring range - accuracy (resolution)	Embedded on electronic board 0 to 36 V ±5% FS (res. 0.01 V)
IP Protection class	IP65
Material	Gauge body: anodized aluminium
Fixing support	N.2 anchor bolts M6
Signal cable	0WE106IP0ZH
Cabling	M12 male connector on sensor body, 3-port T-shaped splitter with 2 female and 1 male connectors
Max. cable length to logger	1000 m

Accessories

Accessories Specifications
February 25 2025 01:51:39

MIND Readout

Mind is a portable, compact multichannel readout unit that reads both analog and digital Sisgeo instruments. It features IP65 protection, Bluetooth Low Energy (BLE) for efficient communication, and is managed via the Mind App, compatible with both Android and iOS. With its rugged design and user-friendly interface, Mind simplifies data storage, sharing, and sensor configuration, while providing easy access to calibration parameters and instrument information through QR codes.

Accessories Specifications

Accessories Specifications
February 25 2025 01:53:08

OMNIAlog Datalogger

The OMNIAlog has been designed “in house” by Sisgeo and is the result of over 25 years’ experience using different dataloggers in geotechnical field. OMNIAlog is a versatile, cost effective and low powered datalogger supporting vibrating wire and all major geotechnical sensors. OMNIAlog has a mini web server on board, 24 local analog channels, expandable to 408 channels through multiplexers and 2 digital opto-isolated input ports. It can be managed by any Internet browser and also includes a USB flash drive support.

Accessories Specifications

	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

Accessories Specifications
February 25 2025 01:54:10

WR LOG Wireless Monitoring System

The WR LOG wireless monitoring system allows nodes to connect to a wide range of sensors and communicate with the Gateway via Long Range Radio. Nodes are easily configured using an Android app, and the system provides simple, web-based visualization software. WR LOG is a low-power system with a battery life of up to 10 years, and the distance between the node and the gateway can reach up to 15 km. The system enables remote connectivity and offers near real-time data, which can be transmitted instantly.

Accessories Specifications

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Title	File Type	File Size	Downloads	View	Last Uploaded
Product Datasheet	application/pdf	10.98 MB			February 27 2025 10:26:21

360° Digital MEMS Tiltmeter