Toughness Matters Because Temperature Strings Need to Last in the Field

What makes a good temperature string? Basically, it comes down to reliability of data. If a string cannot produce reliable data, day-in and day-out for years without maintenance, it'll end up costing more in the end to continuously replace and install new strings. 

We know clients need a really tough temperature string. These strings will be pulled through conduit, buried under concrete, frozen underground, and submersed in water, so quality is of the utmost importance. We put the CS225 through various tests to ensure it can withstand bending, pulling, pressure, freeze/thaw cycles, and temperature cycles. Below is our list of tests that we conducted on the CS225 Temperature String. These tests should be conducted on any temperature string if it's to be considered high-quality and ready for monitoring in the environment. Tests were done to determine if physical and electrical integrity would be maintained.

Quality Testing the CS225 Temperature String

1. Straight Pull Test

Two mesh cable grips hold either end of the string while machines pull the ends in opposite directions. The string passed 40 kg (90 lb) pull test and withstood pulling of up to 150 lb!

2. Through-hole Pull Test

Same as Straight Pull Test, but the string is pulled through a metal plate with a hole in the middle until a mould is butted up against the plate. The string passed a 40 kg (90lb) pull test.

3. 45° Bend Pull Test

A mould was clamped in place while the cable was bent testing the bend radius of the cable. The string passed with a bend radius of 6”.

4. Temperature Cycle Test

String placed in a temperature chamber was cycled four times from -55°C to +85°C.

5. Freeze Thaw Test

String was submersed in water where temperature was brought down to -40°C and then thawed.

6. Pressure Test

The string was placed in a pressure chamber simulating water pressure. The string passed 75 PSI pressure testing and withstood as high as 500 PSI!

In Summary, a good temperature string:

  1. Is extremely rugged and thoroughly tested
  2. Has customizable measurement spacing to suit any number of applications
  3. Is maintenance free and does not require calibration
  4. Provides excellent long-term stability of measurements

The CS225 temperature string is a prime example of our commitment to providing the highest quality monitoring products in the world.  Our revamped design, rigorous validation process, and stringent quality standards are all focused on providing the fantastic quality you require to reliably generate data you can trust, even in the harshest of environments.