File Name
Thermistor Strings
Resource Type
Brochure| Language | Version | Download |
|---|---|---|
| English | EPB0013L |
|
Thermistor Strings
RST Instruments manufacture Thermistor String assemblies that are environmentally hardened to provide accurate and reliable long-term measurements under demanding geotechnical conditions.
Overview
Thermistor Strings incorporate interchangeable, curve tracking, negative temperature coefficient (NTC) thermistors. As the Thermistors are Resistance-Temperature curve matched over selected temperature ranges, this permits the use of multiple sensors with a single readout or data logger, eliminating costly calibration procedures.
RST’s Thermistor Strings are custom manufactured to user specifications for cable length, thermistor number and location on the string. Resistance to water ingress is ensured by a triple encapsulation procedure and is rated to 3.5MPa. The standard cable employed is a heavy-duty, direct burial-rated 22-24 AWG gauge water-blocked instrumentation cable.
RST’s DT Series and RSTAR Affinity Data Loggers or FlexDAQ Data Loggers can be used to monitor one or multiple Thermistor Strings.
THERMISTOR STRINGS SPECIFICATIONS
| ITEM | SPECIFICATION |
| Interchangeability Tolerance | ±0.1°C |
| Interchangeability Temp. Range | 0°C to +75°C |
| Operating Temp. Range | -40°C to +75°C |
| Stability | 0.01°C or better /100 months at 0°C |
| Resistance at 25ºC | 3k ohms |
Thermistor Strings are commonly used here reliable, long-term temperature measurements are required under demanding geotechnical conditions.
View illustrations on how Thermistor Strings are used for:
Thermistor Strings Dimensions + Ordering Info
| PART # | THERMISTOR POINTS | CABLE DIA. | BEAD* DIA. | CABLE |
| TH0003 | 1 point / 1 pair | 13.97 MM / 0.55 IN | EL380002 | |
| TH0022 | 2 point / 2 pair | 6.35 MM / 0.25 IN | 13.97 MM / 0.55 IN | EL380004 |
| TH0022 | 3 point / 3 pair | 6.35 MM / 0.25 IN | 13.97 MM / 0.55 IN | EL380006 |
| TH0022 | 4 point / 4 pair | 8.128 MM / 0.32 IN | 13.97 MM / 0.55 IN | EL360008 |
| TH0022 | 5-6 point / 6 pair | 10.41 MM / 0.41 IN | 19.05 MM / 0.75 IN | EL380012C |
| TH0022 | 6-7 point / 7 pair | 9.84 MM / 0.39 IN | 19.05 MM / 0.75 IN | EL380007P |
| TH0022 | 7-16 point / 13 pair | 10.41 MM / 0.41 IN | 19.05 MM / 0.75 IN | EL380013P |
| Quantities and required thermistor spacing per string. Shortest spacing possible is 150mm (5.9”) |
Cable length | |||
* Please check with RST Sales for accurate dimensions of string assembly.
File Name
Thermistor String Installation and User Manual
Resource Type
Manual| Language | Version | Download |
|---|---|---|
| English | ICM0105B |
|
Speak with an Expert
I’m very happy with the quality of the instrumentation and technical support from RST, as always. They worked with us from the initial stages of the project to ensure that we were fully prepared and equipped to use the RSTAR network for the first time. They delivered everything within the tight project time frame to ensure that there were no delays on site, and the submersible tilt meters looked like new even after over twelve months of being submerged in Thames water!
-Richard Lipscombe, BEng (Hons), Director & Principle Consultant - RL Geotechnical Ltd