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Dwyer long-reach bimetal thermometer with 18-inch stainless stem and 3-inch glass dial

Dwyer Instruments Inc.

Dwyer Instruments BTLRN318101 Long reach bimetal thermometer 18 in stem 0 to 200 F measurement tool

SKU CH-9D73-ZSVCW

Long-reach bimetal thermometer with an 18 in stem measures 0 to 200 F and includes a NIST-traceable certificate

  • TypeEnvironmental & Mechanical
  • Long reach with 18 in stem for deep access
  • Wide temperature range 0 to 200 F covers many applications
  • Clear 3 in dial diameter for easy reading
  • Durable stainless steel housing resists corrosion
  • Glass lens protects dial from damage

Long-reach bimetal thermometer

The Dwyer Instruments BTLRN318101 uses an 18 in stem to place the sensing element deep inside ducts, tanks or process lines. A 3 in dial shows temperatures from 0 to 200 degrees Fahrenheit. Stainless-steel housing and a glass lens protect the mechanism in industrial environments.

Thermals and power draw

Bimetal operation requires no external power, so the instrument adds zero heat and draws no current. The stainless-steel stem conducts process temperature to the coil without electronic self-heating. Silent mechanical movement eliminates fan or pump noise entirely.

Sustained-load behaviour

Continuous immersion at the upper end of the 0 to 200 degrees Fahrenheit range does not degrade calibration because the bimetal element is rated for the full scale. The included NIST-traceable certificate documents initial accuracy. The 1/2 in NPT back connection maintains a secure seal during prolonged service.

Highlights

  • Long reach with 18 in stem for deep access
  • Wide temperature range 0 to 200 F covers many applications
  • Clear 3 in dial diameter for easy reading
  • Durable stainless steel housing resists corrosion
  • Glass lens protects dial from damage

Specifications

BrandDWYER INSTRUMENTS
TypeEnvironmental & Mechanical

Questions about this item

How do I install the 18-inch stem with the 1/2 in NPT back connection, and what step is often missed?

Thread the 1/2 in NPT back connection into the process fitting using pipe sealant on the threads; the step often missed is ensuring the 18-inch stem reaches the measurement zone without bottoming out against the vessel wall.

What maintenance or replacement will the bimetal thermometer need over time?

Periodically verify the 0 to 200 F dial accuracy against a known reference; if the pointer drifts or the glass lens cracks, replace the entire unit because the bimetal element and NIST-traceable certificate are not field-serviceable.

What limit appears first during sustained use at the top of the 200 F range?

Continuous exposure near 200 F can accelerate bimetal fatigue, causing gradual calibration drift before the stainless steel housing or glass lens shows any degradation.

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