The ML-x17 data logger is a small, ultra low power, cost effective data logger with built-in 2G, 3G or 4G cellular modem. This small data logger, is further provided with an internal temperature sensor, 8GB micro SD card and a 2FF SIM card slot. The data logger is available with several power provisions a/o: 3.6 Volt Lithium battery, 8..28V DC input or integrated solar panel with 3 x AA NiMH charger.

The data logger can acquire physical signals by 2 current loop inputs, 2 voltage inputs, 1 potentiometer input and 3 digital inputs. More or special inputs can be added by means of internal stackable option boards/converters. The data logger is provided with one serial port to capture measurements from ASCII, MODBUS, NMEA or SDI-12 compatible sensors. External sensors can be powered by the data logger itself, to prevent them to consume power while the data logger is a sleep. Up to 8 mathematical channels are available to calculate meaningful engineering values derived from sensor input values (e.g. a polynomial to calculate a flow from a stream level). Supports up to 8 aggregation channels (e.g. to record 2 or 10 minute wind speed averages sampled at 1Hz).

Logged data can be pushed to a central host by HTTP(S), FTP(S), e-mail, secure TCP or MQTT at configurable intervals and optionally by satellite as well (Iridium SBD).

The ML-x17 is available in several editions and with 5 different cellular modems:

ML-217: 2G Global

ML-317: 3G Global with 2G fall-back

ML-417: 4G Global (LTE-M) with 2G fall-back

ML-E417: 4G Europe (LTE Cat 1) with 2G fall-back

ML-N417: 4G North-America (LTE Cat 1) with 3G fall-back

When equipped with the integrated solar panel a complete self providing remote monitoring station can be arranged, all you need is a logger and applicable sensor(s). This self providing cellular logger is costs saving, because you don’t need: a) solar panels, b) big batteries, c) cellular modem and d) encapsulating cabinet.

Specifications

Data Logging

1 second to 1 day intervals.

Regular, alarm and independent intervals.

Daily operation time bracket (e.g. 07:00AM to 20:00PM or 21:00PM – 06:00AM)

8GB micro SD-Card (file storage), 512kB (program storage), 64kB SRAM (runtime memory).

Data push

1 minute to 1 day intervals.

Regular and alarm intervals.

Direct push on alarm raise and fall.

Daily operation time bracket (e.g. 07:00AM to 20:00PM)

Native TXT, JSON or CSV log files by HTTP( SLL/TLS), FTP (TLS Explicit), e-Mail (SMTP) , secure TCP (AES-128) or MQTT.

JPG pictures by HTTP(S), FTP(S), e-Mail , TCP or MQTT.

SBD messages by Iridium satellite modems (960x)

Alarming

Alerts by SMS, e-Mail and MQTT.

Open collector output (max. 100mA sink current)

Internal Sensors

Battery (voltage and rest capacity)

Processor temperature

GSM signal strength

Analog Inputs (12bit resolution & <0.1% FS accuracy)

2x current loop inputs (0/4..20mA, 150 Ohm impedance)

2x voltage inputs (0..10V)

1x potentiometer input (max. 10M Ohm)

Digital Inputs (0..5V)

3x state, On-time meter or pulse counter (max. 10kHz)

Serial Input (1x RS-232, RS-485 or SDI-12)

SDI-12 (up to 15 devices, max 20 channels per device)

MODBUS RTU/ASCII (read registers from up to 15 slaves)

NMEA-0183 (standard and custom sentences)

ASCII (sensors outputting readable lines of numeric values)

Derived Inputs

8x calculation channels, using mathematical operators and functions (a/o cos, sin, atan2, ln, sqrt).

8x aggregation channels, min/max, average, gust, std dev and up to 3 different percentiles sampled at 1Hz max.

Accessory Port (1x RS-232 & 5V excitation, to connect and pow-er a GPS receiver, Iridium SBD modem, JPG camera or TFT-display)

Built-in cellular modem (5 different models)

ML-217 2G (Quad-band GPRS)

ML-317: 3G (Penta-band & Quad-band GPRS fall-back)

ML-417: 4G (LTE-M & Quad-band GPRS fall-back)

ML-E/N417: 4G (LTE-Cat 1 for Europe or North-America)

2FF (Class B) SIM-CARD slot.

Integrated GSM antenna, external GSM antenna optional.

Configuration by:

USB (local) or secure TCP tunnel (remote)

Power consumption

60mA@3.6V average operating2) current during a duty cycle of less than 1 sec3) per log interval.

250mA@3.6V average operating current during 20 to 60 seconds cellular communication.

<80uA@3.6V sleep current.

12V@200mA excitation to power external sensors.

Power supply (5 different editions)

(3)LI : (3x) 3.6V D-Size SAFT-LSH20 Lithium battery 4)

PV : 1Wp Integrated solar panel and 3x AA NiMH charger

SLA : 12V SLA battery charger and 21VOC solar panel input

DC: 8..28V DC input and integrated 3x AA NiMH charger

Enclosure (6 different covers)

(3)LI /SLA/DC: IP68 (30min@2m), 130x120x85mm, 460g.

PV : IP67, 130x120x125mm, 530g.

TFT: IP54, 130x120x85mm, 600g.

UV stabilized polycarbonate.

Wide temperature operating range –30°C to +75°C

1) ML-417 has no e-mail abilities.

2) 60mA if no external sensors need to be powered.

3) <1 sec. if external sensors are responsive and don’t require time to “warm up”.

4) SAFT LSH20 Lithium or NiMH batteries not included.