Bimetallic Thermometers - Product Range
Description and General Specifications
Nominal diameter : 80mm. or 100mm.
Temp. sensing system : bimetallic spring.
Casing : stainless steel AISI 304.
Locking clear window : glass or polycarbonate.
Locking ring : stainless steel AISI 304.
Maximum temp. indicating pointer : fitted on the window and resetable with an apposite button.
Standard measuring range : -20/+120°C and 0/+120°C.
Measuring accuracy : 1,5% of full scale value.
Operating Instructions and Maintenance
Maintenance : No particular maintenance is required. Only, on regular basis, schedule inspections to verify correct function and calibration. Typically a check of the precision must be done after 24 months. In case the transparent is dirty, thus reducing the readability of the dial, you can clean it with a soft cloth, wa- ter and soap. Pay attention in case the thermometer is equipped with polycarbonate transparent as it can be scratched.
Finished Product Quality Control Tests
- bath 1 = 0°C
- bath 2 = 20°C
- bath 3 = 50°C
- bath 4 = 100°C
- bath 5 = 115°C
Calibration procedure :
- Step 1 : a check is carried out to see whether the temperature taken by the instrument under test differs from that taken through the sample sensor by more than the 70% of the maximum allowed instrument reading tolerance value. This test is performed by sequentially plunging the Bimetallic Thermometer bulb into successive temperature increasing thermostatic baths : 0°C / +20°C / +50°C / +100°C / +115°C.
- Step 2 : the instrument is heated until the instrument pointer exceeds by 20% the angular full scale value.
- Step 3 : step 1 is repeated, but inversely.
Check of instrument mechanical protection degree : IP 55.