RST Instruments manufactures thermistor string assemblies that are environmentally hardened to provide accurate and reliable long-term measurements under demanding geotechnical conditions.
RST Instruments manufactures thermistor string assemblies that are environmentally hardened to provide accurate and reliable long-term measurements under demanding geotechnical conditions. The strings incorporate interchangeable, curve tracking, negative temperature coefficient (NTC) thermistors. As the thermistors are curve matched to desired temperature tolerance over selected temperature ranges, this permits the use of multiple sensors with a single readout or data logger, eliminating costly calibration procedures.
RST thermistor strings are custom manufactured to user specifications: cable length, thermistor number and location on the string. Resistance to the ingress of water is insured by a triple encapsulation procedure. Standard cable employed is a heavy duty, direct burial rated 22 gauge water blocked instrumentation cable.
RST’s DT Series Data Loggers or flexDAQ Data Loggers can be used to monitor the string.
|Interchangeability Temp. Range||0°C to +75°C|
|Operating Temp. Range||-80°C to +75°C|
|Stability||0.01°C or better /100 months at 0°C|
|Resistance at 25º||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:
|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||7-16 point / 13 pair||10.41 MM / 0.41 IN||19.05 MM / 0.75 IN||EL380013P|
* Please check with RST Sales for accurate dimensions of string assembly.
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