S551 Portable Display and Data Logger for Compressor Efficiency and Energy Audits

Flexible portable data logger for energy analysis (ISO 50001) and air audits (ISO 11011) at the point-of-use.

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Easy-to-use portable data logger at the point of use

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High-resolution 5" color touch screen

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Connection to S4M software for data analysis

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Compressor efficiency measurements and audits

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Optional 4G/LTE modem for remote monitoring

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Integrated strong battery as back-up power

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20 sensors inputs (2 x SDI; 2 x analog; 16 x Modbus)

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Portable unit can be carried with one hand

The S551 Portable Data Logger for compressed air efficiency monitoring is the ideal data logger for energy analysis (ISO 50001) and air audits (ISO 11011) on site.

On-site Logging

The ultraportable and robust design helps to perform measurement tasks and audits on site. The high resolution 5” color touch screen interface makes the operation as simple as possible. To prevent data loss during power glitches and cuts, the backup battery ensures continuous data logging at the point-of-use.

Plug & Play Solution

The S551 Portable Data Logger is an easy to use and time-effective solution. With a few settings, the data logger is ready for operations with virtually unlimited memory size. No time-consuming configuration and programming are required. Just connect the sensor and start the recording. SUTO intelligent sensors are detected automatically on power-up.

Versatile Connections and Sensor Inputs

All sensors for required measurement tasks (air flow, air consumption, power consumption, pressure, temperature and many more) can be easily connected. The S551 provides up to 24 inputs through extension boxes and Modbus. Third-party sensors can also be connected in a few minutes.

Optional 4G/LTE Remote Connection

By integrating a USB port for 4G dongle connection outside S551casing, the portable data logger can be easily connected to the S4A Software and monitored remotely. This eliminates the need for a Wi-Fi connection.

The USB 4G dongle is an optional feature. It can be ordered together with S551, but also upgraded later. To make use of this new feature, a SIM card is required.

Remote Data Analysis

The S551 is capable of sending measurement data and status information to a remote server through the Internet. This allows users to monitor the system remotely.

The full Software Packages
  • S4A for data export and simple analysis (free of charge)
  • CAA for compressed air analysis and audits (included with S551)

Please contact us here for more information and consultation. We are happy to find the best possible solution for your application.

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The ideal data logger for energy analysis (ISO 50001) and air audits (ISO 11011).

Suto Compressor Efficiency Test



Data logger
Storage4 GB, up to 100 million values
Sampling rateThe minimum time interval is 1 second
Digital input
Interface2 x SDI connectors, 2 x Modbus/RTUconnectors
Update rateValue updated every 1 sec
No. of connectable2 x SDI sensors
Sensors16 x Modbus/RTU sensor
Analog input
SignalAnalog (0 ... 20 mA, 4 ... 20 mA, 0 ... 1 V, 0 ... 10 V), Pulse
BurdenMax. 250 Ohm
Update rateValue updated every 1 sec
Fieldbus output
ProtocolModbus/RTU, Modbus/TCP
Update rateValue updated every 1 sec
Other outputs
Communication Interface4G/LTE (optional)
PurposeView the online measurement values, read out the logging files remotely through S4A software and USB 4G dongle
Main power supply100 ... 240 VAC, 50/60 Hz, 1.4 A
Data interface
ConnectionUSB micro, LAN (Ethernet)
PurposeRead logger files & screenshots, show live data
Integrated web serverRemote monitoring (LAN)


PC SoftwareS4C-Display (via USB or LAN)
Integrated touch screen5” high resolution graphic display, 800 x 480 pixels with touch interface
HousingPC + ABS
Electrical connection2 x M12 (5 pole) for SDI; 2 x Optional M12 (5 pole) for analog and pulse;2 x M12 (5 pole) for Modbus/RTU; 1 x RJ45 Ethernet
Protection classIP65 (only if the suitcase lid is closed and locked)
Weight4 kg
Operating conditions
Operating temperature0 ... +50 °C
Storage humidity< 90 %
Storage temperature-20 ... 50 °C
Transport temperature-20 ... 50 °C


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Info sheets
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S320/ S325/ S330/ S331/ S551/ S51 – CE & UKCA DECLARATION OF CONFORMITY

S320/ S325/ S330/ S331/ S551/ S51 – CE & UKCA DECLARATION OF CONFORMITY
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S4C Display Settings: V1.5.85

S4C Display Settings: V1.5.85
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S4A Software: V1.4.5

SoftwareS4A Software for reading and exporting data from SUTO data loggers
S4A Software: V1.4.5
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