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Sequoia Scientific Inc

Hyper-a Hyperspectral absorption instrument

LISST-Logger

Submersible 2,000 m rated datalogger

LISST-Logger submersible datalogger View Gallery

The LISST-Logger is a fully submersible datalogger with two RS-232 ports, rated to 2,000 m depth.

Sequoia designed the LISST-Logger first and foremost for its LISST-Tau and LISST-OST instruments. It records data from up to 6 digital and analog sensors at the same time. That includes RS-232 output from up to two LISST-Tau’s or LISST-OST’s, plus up to four analog sensors. It also works with other RS-232 sensors that start sending data as soon as they power up.

See the FAQs for sensor compatibility.

Flexible submersible datalogger

The two RS-232 channels operate independently. You can pair each one with two high-resolution analog input channels. This lets you log several sensors at once, even when they use different interfaces and sampling rates. For example, you can run a LISST-OST on one port and an analog sensor on the other.

Programmable, low-power logging

You can program the logging schedules with start, stop and logging interval settings. The logger runs two fully independent schedules at the same time. Each port logs only during the sampling window you set for it. Start and stop logging with the rotary switch on the housing. You can also use a digital signal (+5 to 12 V).

With every recording, the logger also stores a time stamp, the input voltage, and its internal temperature and humidity.

The LISST-Logger runs from an external 7–30 VDC power supply or battery. It controls power to the connected sensors and switches them fully off when they are not in use. Between logging intervals, it drops into a low-power sleep mode (0.6 mA at 12 V). This makes the LISST-Logger a practical submersible datalogger for long-term deployments.

Plan your deployment with the LISST-Logger battery calculator.

The LISST-Logger comes with software, but you don’t need it. You can simply connect to the logger and program it from a terminal window.

ALL NEW LISST-Logger – ready for ordering since January 2026!

Features

  • 2,000-meter depth rating
  • Real-time data logging
  • Connects and logs one to six instruments at the same time
  • Compatible with LISST-OST and LISST-Tau instruments
  • Two RS-232 serial interfaces
  • Four high-resolution analog input channels (16-bit ADC)
  • Start/stop digital signal (+5 to 12 V)
  • External digital trigger input
  • Low-power sleep mode operation
  • Integrated temperature and humidity sensor
  • Externally powered (no internal battery)
  • Software included with instrument
  • Accessory cables available in custom lengths
  • Two programmable logging schedules

Specifications

Mechanical

  • Dimensions [Ø × L]: 5.08 cm × 19.7 cm (2.00″ × 7.77″)
  • Weight [air / seawater]: 0.61 kg / 0.26 kg (1.34 lbs / 0.58 lbs)
  • Depth rating: 2,000 m
  • Housing material: Anodized aluminum (black) with sacrificial anode protection

Electrical

  • External power input: 7–30 VDC
  • Power output (per sensor): Up to 12 W (input voltage passed through, 7–30 V)
  • Current consumption: 5 mA @ 12 V operational, 0.6 mA @ 12 V sleep

Data & interfaces

  • Sampling rate: Up to 1 Hz
  • Data logging: Real-time, independent per channel
  • Storage: 1 GB
  • Serial interfaces: 2 × RS-232
  • Analog inputs: 4 channels, 0–5 V, 16-bit resolution
  • Connectors: SubConn MCBH5M, 2 × SubConn MCBH6F

Items

LISST-Logger Item # and Description
Item #DescriptionThumbnail
SEQ-FP-LISST-LOGLISST-Logger - 2,000 m rated data logger

LISST-Logger Accessories *NOT INCLUDED* with LISST-Logger

Item #DescriptionThumbnail
SEQ-AC-LOG-CBLLISST Logger 1.35 m Sensor Cable Assembly [MCIL6-F/MCIL-6-M]

LISST-Logger Accessories *INCLUDED* with LISST-Logger

Item #DescriptionThumbnail
SEQ-AC-LOG-CBL02LISST-Logger 2m Integrated Comm & Ext Pwr Cable w/15V Pwr

FAQ

What does the LISST-Logger log?

The LISST-Logger logs RS-232 data printed to the serial port of the connected instrument. One serial sensor can be connected to each of the two serial sensor ports on the LISST-Logger.

The LISST-Logger can ALSO accept up to two analog sensors connected to each serial sensor port of the LISST-Logger.

Consult the two FAQs below to determine if your digital or analog sensor will work with the LISST-Logger. 

Will the LISST-Logger work with my digital sensor?

Use the flowchart below to determine if your digital sensor will work with the LISST-Logger. Ask your sensor manufacturer if your sensor datasheet or manual does not provide clear answers to the questions in the flowchart.

LISST-Logger digital sensor compatibility flow chart

LISST-Logger digital sensor compatibility flow chart

 

Will the LISST-Logger work with my analog sensor?

The LISST-Logger is primarily designed to log digital data. When digital data is recorded, an auxiliary file is also created that includes a time stamp, power input voltage, and internal temperature and humidity, recorded at 1 Hz during the sampling window.

As an optional feature, two analog input channels are available on each sensor port. These analog inputs are recorded as 16-bit values at the same 1 Hz interval and are written to the auxiliary file along with the other status data. Each measurement is recorded as a new line of comma-separated values. No other analog sampling rates are supported. The supported input voltage range is 0–5 V with 16-bit resolution.

The LISST-Logger may be used with analog sensors alone or in combination with digital sensors. For example, a digital sensor may be connected to Port A while an analog sensor is connected to Port B. With custom Y-cabling, it is also possible to connect two digital sensors and up to four analog sensors. Analog inputs are logged only during the sampling window configured for the port to which they are connected.

Use the flowchart below to determine if your analog sensor will work with the LISST-Logger. Ask your sensor manufacturer if your sensor datasheet or manual does not provide clear answers to the questions in the flowchart.

LISST-Logger analog sensor compatibility flow chart

 

Does the LISST-Logger provide power to the sensors?

No. You must provide an external power source, for example a submersible battery pack, that can power both the LISST-Logger and the connected sensors. Sequoia can provide these, ask us.

The LISST-Logger has a small coin cell to keep the date and time on its internal processor, but the coin cell cannot power anything else.

What Sequoia instruments require a datalogger?

The LISST-Tau and the LISST-OST require a LISST-Logger unless you integrate them into another system that provides power and logs their data. All other LISST and Hyper instruments from Sequoia have their own internal datalogger and do not require an external datalogger.

Note that the discontinued LISST-ABS and LISST-AOBS from Sequoia also require an external datalogger – if you need a submersible datalogger for your LISST-ABS or LISST-AOBS the LISST-Logger will work with both of these instruments too.

Can I rent the LISST-Logger?

No.

Can I control the voltage output to the connected sensors?

Only by controlling the input voltage to the logger itself. The LISST-Logger will accept any input voltage between 7V and 30V and will simply pass through this voltage UNREGULATED to ALL connected sensors.

If you need to provide a lower voltage to sensors, e.g., on connector A, then you will need to build a custom cable with a built-in regulator.

Do you supply cables to connect my sensors to the LISST-Logger?

Only if your sensors are LISST-Tau‘s, LISST-OST‘s, LISST-ABS‘s or LISST-AOBS‘s.

Otherwise we recommend that you contact a provider of custom cabling such as MacArtney (22 worldwide locations, worldwide workshops and worldwide cable and connector stock) or Ocean Innovations (US) to design and manufacture your custom cable.

Where do I find the LISST-Logger pinouts so I can make a custom cable?

Right here: LISST-Logger Electrical Connections