Expert Logger


Expert Logger is a new generation of data loggers. It combines the latest communication technology with advanced measurement technology, and is based on FPGA technology to make it especially powerful. It can process up to 46 analog input channels at both low and high rates of sampling.  Measurement data can be accurately acquired, independently stored and transmitted to the internet or a PC for evaluation via USB, LAN, WLAN or LTE.

With an OPC UA interface

OPC UA is becoming an increasingly established protocol and when used with the Expert Logger devices, measurement acquisition, monitoring and test stand automation applications can be made ready for open data exchange data in accordance with Industry 4.0/Internt of Things.

Both OPC UA servers and clients have been integrated into the Expert Logger devices to enable fast, easy and barrier-free data exchange with sensors and sub-systems also supporting OPC UA.

Many products such as frequency converters, controllers and regulators have already fully integrated OPC UA. The opportunities provided by OPC UA have been identified within the measurement and sensor technology sector with several sensors and actuators now available with OPC UA interfaces. 

In addition to OPC UA, Expert Logger devices are also equipped with PROFIBUS, ModBus, CAN-Bus and serial interfaces for sensor and field level connections.

Operation made simple
Sensors are connected via plug-in screw terminals and a chart clearly shows how channels are arranged. Users always have a good overview of the channels despite their high density. Each set of four terminals can be configured as two differential inputs to measure voltage, currents, thermocouples, or to take measurements from a 4-wire RTD.

Configuration - fast and easy
The Expert Logger is simple to configure from a PC. These settings remain stored within the Expert Logger even when disconnected from the power supply. The device settings can also be read out and stored on a PC and analysed offline without the need for a connected Expert Logger. The offline configuration settings are then simply read into the device when connected. The software used for configuration is simple to operate to let users fully focus on their measurement tasks.

Intelligent signal processing
Signal processing using internal software channels significantly simplifies measurement tasks. Flexible calculation channels enable measurement data to undergo further computation and recording. Integrators directly calculate volumes or quantities from time related measurement data such as mass and discharge flow rates. Limit values can monitor measurement data and be used to switch digital outputs or automatically send emails. Complex signal processing is possible using pulse counters, stop-clock functions and operating-hours counter. Averages can be calculated and recorded as time-weighted or moving. The Expert Logger‘s software channels clearly set it apart from other loggers and make it very popular among users.

pdfExpert Logger.pdf

Functions of Expert Logger 

Following is a list of the main features of Expert Logger.

Sensor connection

Universal analog inputs (mV mA, TC, RTD)
Digital inputs and outputs
Plug-in screw terminals

Serial and SDI12 interfaces

SDI12 interfaces for environmental sensors
Serial RS232 ports and a RS485
Configuration of individual ASCII protocols

Battery and rechargeable operation

Independent operation possible with batteries orrechargeables
Minimal energy consumption via a sleep function
User-defined wake and measuring intervals

Internal data storage

4 GB of internal data storage for up to 125 million measurement values
Time stamps to msec resolution
Data read out via LAN, WLAN or USB interface

External data storage

Data recorded to external storage media (USB, NAS)
PUSH function to send measurement data to theinternet
Event-triggered recording with pre and post histories

Remote monitoring

WLAN link to PCs and mobile devices
Optional LTE / UMTS / 4G integrated modem
Automatic notification via email or text messaging

PC and field bus interfaces

LAN and USB interface to a PC or network
CAN-Bus interface for reading / writing identifiers
Field bus interfaces PROFIBUS DP, Modbus

Monitoring functions

Monitoring and data logging in a single device
Limit value setting for any sensor signal or calculationchannel
Controlling digital outputs with user-defined triggering
Logging of pictures from webcam by external trigger

Signal processing

Averaging (middle, min, max, RMS values)
Integration of time signals into volumes, masses or working values
Computational functions (basic functions, polynomial, trigonometric ...)


The touch display enables users to configure the Expert Logger‘s basic settings such as the IP address and network mask. The display also simultaneously shows selected measurement data. The display operates via either touch or an external USB mouse.

 Universal, communicative, reliable


Expert Logger is available in three versions which differ only in the number of analog and digital inputs they can process. All Expert Logger devices are equipped with internal 4 GB memories that can independently store up to 125 million measurement values with date and time stamps to msec precision. Storage capacity can be extended as required via external USB or LAN storage devices (NAS). An integrated, energy-saving “sleep function“ automatically switches off the device during breaks in measurement acquisition. The Expert Logger operates with standard batteries, rechargeable batteries or solar units.

Precision measurement is ensured through the use of a 24-bit converter. Voltages can also be precision recorded to the μV range. All channels are galvanically isolated to suppress earthing loops and the tried and tested input circuitry protects the device against voltage spikes. Electromechanical components are avoided (relays multiplexer), and the device operates noise and maintenance free. Delphin‘s patented analog inputs guarantee years of reliable measuring work.

Expert Logger accessories

Rechargeable pack for energy independent operation
External data storage
UMTS / LTE module
WLAN module

Measurement data analysis included

 To make it as easy as possible for users to operate the Expert Logger, the powerful ProfiSignal Go software is included free with delivery. ProfiSignal Go enables users to portray measurement data online and offline and to carry out detailed analysis. The software can portray the Expert Logger‘s measurement data in trends. Users can choose between y(t) or y(x) diagrams as well as a range of other analysis diagrams. ProfiSignal Go is especially intuitive to make it highly user friendly.

A range of options

Online / offline analysis and diagnosis of measurement data
A range of trend formats y(t), y(x), digital signal analysis
ASCII / CSV / TDM data exporting
Output or export of trends as EMF files
Analysis using cursor functions
Offline data evaluation is easy and quick to perform. The software also enables fast ASCII exporting of the measurement data for MS Excel™, or conversion into TDM format.
Our customers tell us that it is a pleasure to use ProfiSignal Go.

Technical specifications

Expert Logger    
Device type  100 200  300 
Analog inputs (mV, mA, TC)  16 32  46 
Appropriate for RTD´s  (8) (16)  (23) 
Total sampling rate 1000 Hz 2 groups of 1000 Hz 3 groups of 1000 Hz
Voltage / current measurement range ± 156 mV .. ± 10 V / 0 .. 20 mA, 4 .. 20 mA, free
Current reference for restistance measurement None, 100µA, 200µA or 1 mA software switchable
Resolution / input impedance 24 bit / 1GΩ
Reference junction yes / 2 yes / 4 yes / 6
Withstand voltage / galvanic isolation ± 100 VDC / ± 400 VDC to PE
Channel to channel ± 100 VDC / ± 400 VDC
Digital frequency inputs 4 to 8 -

Input signal

  low: 0 .. 1.2 VDC / high: 5 .. 100 VDC-3.5 mA
Measurement range, frequency inputs / Broadcounter 0 .. 200 KHz / 64 bit  
Galvanic isolation   yes, up to ± 400 VDC to PE
Digital outputs (also PWM) 4 to 8 -
Max. switching voltage / current   50 V / 3 A  -
PWM basic frequency  5 Hz to 10 kHz 
Pulse-width modulation / resolution 1:1000  
Galvanic isolation yes, up to ± 400 VDC to PE
Digital voltage reference 1    -
Current    up to 140 mA -
Voltage    5 VDC -
Short circuit proof    yes -
Galvanic isolation  yes, up to ± 400 VDC to PE   -
Data storage   
Data storage internal 2 .. 14 GB / ca. 30 million measurement values to GB   
Data storage external USB, NFS, CIFS, (S)FTP   
Sensor bus SDI12    1
Physical equipment COM 1 / COM 2 RS485, 9-pole Sub-D plug, DIN EN ISO 19245-1   
Physical equipment COM 3 RS232, 9-pole Sub-D plugs   
LAN 1 x 1000Base-TX, 1 x 100Base-TX   
WLAN (optional to WWAN) 802.11b/g/n   
WWAN (optional to WLAN) UMTS, LTE (configuration, real time data, email)   
USB Device 2.0 low / full / high speed / Host 2.0 low speed   
CAN 2.0 / PROFIBUS 2x / 2x, max. 12 Mbit   
PROFIBUS DPV1 Slave / passive sniffer
RS 232 / 485 Modbus RTU, SCPI, ASCII
General technical information
Dimensions / weight 210 x 80 x 125 mm  / 750 g
Fixing Rail mounting DIN EN 60715 or screw fixing
Signal connections Plug-in screw terminals, max. 1.5 mm2, 96 in 2 rows
Temperature range -20 .. 60 °C
Power supply 12 .. 24 VDC / ± 10 %
Power input – normal mode max. 10 Watt
Power input – sleep mode 5 mW-12 V, 10mW-24V