String + logger
Direct 2Wire readout
The matched logger forms a compact measurement system with no separate protocol converter. Stainless-steel and POM enclosure configurations are available for different installation conditions.
Technical data
Thermistor string specifications
01 / Sensor nodes
Choose the resolution your measurement needs.
All node types operate on the same digital two-wire system and may be combined within a compatible string.
| Parameter | TNode | TNode EX | TNode HD |
|---|---|---|---|
| Sensor type | Digital chip | Pt1000 | Pt100 |
| Resolution | 0.01 °C | 0.001 °C | 0.0001 °C |
| Accuracy | ±0.1 °C at −5…+50 °C ±0.5 °C at −40…+85 °C |
±0.1 °C at −20…+25 °C ±0.2 °C at −30…+40 °C ±0.5 °C at −40…+85 °C |
±0.05 °C at −20…+25 °C ±0.1 °C at −30…+40 °C ±0.25 °C at −40…+85 °C |
| Operating range | −40 °C to +85 °C | −40 °C to +85 °C | −40 °C to +85 °C |
| Operating voltage | 3.2–3.6 V | 3.0–3.6 V | 3.0–3.6 V |
| Standby current | 0.75 µA | 0.5 µA | 0.6 µA |
| Active current | 2.5 mA @ 500 ms | 2.5 mA @ 600 ms | 4 mA @ 800 ms |
| Data output | Digital 2W bus | Digital 2W bus | Digital 2W bus |
Compact sensor body02 / Mechanical system
Rugged from node to connector.
- 01 Standard string lengths of up to 100 metres; 250 metres or more on request
- 02 Up to 500 metres total cable length without cable-related accuracy loss
- 03 Temperature and pressure sensors in line or star topology
- 04 Stainless steel sensor tube, DIN 1.4571
- 05 PUR string cable, approx. 4.2 mm diameter
- 06 Up to 30 kg tensile load
- 07 M8 IP67 connector or connector-free construction
- 08 Over-moulded, water-resistant measuring points
03 / Interfaces & logging
From native 2Wire to the logger you need.
The string always uses the same two-wire protocol. Select either a matched direct logger or the Type 410 bridge to SDI-12.
String protocol
Digital 2Wire communication along the complete temperature or pressure sensor string.
Direct connection
Compatible GEOprecision miniloggers connect directly and are available in stainless-steel or POM housings.
SDI-12 bridge
The POM-housed OSX node Type 410 converts the 2Wire string to SDI-12 V1.3.
Logger choice
After conversion, use any SDI-12-capable data logger. GEOprecision LTX loggers are optimised for the application.
Local access
Type 410 provides Bluetooth Low Energy for configuration and diagnostics with BlueShell or the BLX Dashboard.
System scale
Up to 50 sensors as standard, optionally up to 300, in line or star networks with up to 500 m total cable.
04 / Direct miniloggers
A compact field system—without a converter.
A compatible GEOprecision minilogger connects directly to the native 2Wire string. Choose the enclosure, regional radio version and field-replaceable battery to suit the deployment.
Local radio access
433 or 915 MHz
Direct logger variants use 433 MHz or 915 MHz for wireless communication with a PC. The correct version depends on the country of operation and its radio regulations.
Field power
Replace without soldering
The integrated holder accepts the specified AA-format battery. Depending on the logger configuration, this can be a 1.5 V alkaline or lithium cell, or a 3.6 V lithium-thionyl-chloride cell.
Radio band and battery chemistry must match the ordered logger and the regulations at the deployment site. Use only the battery type specified for the device.