GSM GPRS Data Loggers enable remote monitoring.

Press Release Summary:

With Isodaq Tadpole GSM GPRS Data Loggers, users can perform water and environmental monitoring and gain online access to precision measurements at remote sites, even under hostile conditions. Sealed-for-life battery-powered dataloggers store values in memory and transmit data at regular intervals or on alarm activation via GPRS to telemetry server. Available with either 2.5G or 3G GSM modems, 16-channel loggers connect to wide range of digital sensors including multi-parameter SDI-12 sensors.

Original Press Release:

Environmental GSM GPRS Data Logger Saves Time and Cost

SDI-12 Data Loggers with Up to 16 Channel Inputs

CHESTERLAND OH — Technicians working in environmental fields need a remote monitoring solution to remove the need for repeated trips out to a device to collect its readings. To save organizations time and cost, Isodaq introduces all-new versions of the Tadpole GSM GPRS Data Logger. These standalone loggers enable users to perform water and environmental monitoring and gain online access to precision measurements at remote sites, even under hostile conditions. Ideal for connection with SDI-12 sensors, Tadpole loggers provide much of the functionality expected of a Remote Telemetry Unit (RTU) at a fraction of the cost. CAS DataLoggers offers the Tadpole and other innovative Isodaq solutions at:

Remote Monitoring Solutions

The Isodaq Tadpole has been spawned from the success of its father logger, the Frog RX, which shares the same proven technology platform. All Isodaq data loggers are designed for water and environmental monitoring applications where systems are operated at remote sites. The Tadpole is a sealed-for-life battery-powered datalogger which stores values in memory and transmits data at regular intervals or on alarm activation via GPRS to a telemetry server. Along with the Tadpole’s field-replaceable battery packs, this saves the significant cost of repeated trips out to other dataloggers to collect their readings.

Tadpole’s Areas of Application Include:

Rainfall intensity monitoring with alarms

Wind profiling or weather monitoring

Water level in rivers, lakes and boreholes

Water quality monitoring

Flood and pollution warning

Digital pulse/frequency or on/off status e.g. gate closure

Tadpole data loggers connect to a wide range of digital sensors including multi-parameter SDI-12 sensors - the ideal multi-purpose device for hydrometric applications. Both Tadpole versions have an external antennae socket and can log Digital Pulse/Frequency (max 2 ch). This single-board 16-channel data logger with on-board GSM/GPRS modem is sealed for life against moisture ingress, and designed for remote monitoring in harsh environments.

Choice of 2.5G or 3G GSM modems available:

1) Tadpole R2 model - Quad-band 850/900/1800/1900MHz GSM/GPRS modem

2) Tadpole R3 model - Multi-band HSPA + LGA modem with GSM/EGPRS fall-back

Tadpole R2/R3 GSM/GPRS/3G telemetry dataloggers are ideal for rapid deployment at remote sites. These models are fitted with 6 spade terminals for easy wiring of the battery and sensors and are best suited for location inside a secondary enclosure on the bench of an instrument hut. With a range of field-replaceable battery packs and an accessible SIM card holder, Tadpole offers the flexibility required for rapid deployment for short or long-term surveys. If 24/7 comms are required, users can opt for an optional lead for external 6/12V lead-acid battery (i.e. rechargeable via solar panel).

The Tadpole’s small size (48mm diam., approx. 160mm long) allows it to fight into tight spaces. This offers savings for ease of deployment inside rain-gauges or small enclosures. For example the Tadpole fits inside many popular automatic rain-gauges including Casella and Munro's tipping-bucket gauges and the Sutron TPG1 weighing gauge.


Harvest for Windows is the license-free software package used with the Isodaq family of loggers for configuration and onsite data collection. It is available in versions for both Windows (98, 2000, XP, Vista or 7) and Windows Mobile (3, 5 or 6). Harvest allows users to set up the logger, configure their recording rates & alarms, and graph data for all channels. Operators can also activate a control output on alarm, configure & test telemetry modems, export data to CSV or XML format files, and more.

With over 100 years’ total experience supplying measurement and data acquisition equipment, CAS DataLoggers provides these affordable products for customers around the world.

For more information on our Isodaq remote telemetry data loggers for weather measurement, water quality applications and more, contact a CAS Data Logger Applications Specialist at (800) 956-4437 or visit our website at

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