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Verifying the temperature indication
To ensure that the results of the adjustment operations
described below are reliable, the
following minimum
immersion
depths should be maintained:
•
60 mm
for bimetallic thermometers-types
TS, TH, TM, TK
•
70, 120, 220 mm (ls+20)
– according to bulb type –
for gas pressure thermometers
(types TF, TG).
These lengths are indicated by a welding seam around
the bulb.
The reference temperature
If the temperature of the medium (liquid, gas) in which the
stem or the bulb is immersed is not known, and neither a
correctly calibrated reference thermometer is placed nearby, or
a calibration bath (filled with oil or water and stirred)
is available, the instrument can be verified by either of the
following two simple methods:
a.
Immerse the thermometer stem or the bulb in
melting ice
(ratio ice: water approx. 2:1) and stir it around. After about
5 minutes – the time to allow the measuring system to
stabilize – the thermometer should indicate 0°C.
b.
Immerse the thermometer stem or the bulb in
boiling
water
. After about 5 minutes – the time to allow the
measuring system to stabilize – the thermometer should
indicate:
100 °C at 0 m (sea level)
99 °C at 327 m
98 °C at 654 m
The temperature of boiling water at other altitudes can be
found by assuming a drop of 1°C per 327 m height increase.
In this approximate but often useful method, temporary
atmospheric pressure variations can be neglected.
Important ! Verification and adjustment at ambient
temperature are not recommended.
Verifying, setting and readjusting Rüeger Thermometers
All these thermometers, designed to meet the most demanding requirements, are provided with one or several adjust-
ment devices. These devices allow :
• setting to a given working temperature, for accurate indication and the compensation of errors due to the
measuring point
• readjustment, for example after long use under severe vibrations or frequent shocks
• rotation of the dial (type TMH).
• resetting after rotating the dial (types TMV... and TMI...), for example to orient the stem in a different direction
• alignment of a thermometer mounted in a row
• setting switchpoints of electrical switching thermometers from the outside; types TM (H, V, I) K, TG (H, V, I) K,
TF (H, V) K
• external resetting of thermometers with pierced case; types TH (H, I)
Instruction manual for adjustment and recalibration
Thermo-
Standard
TS
of thermometers
Hit
TH
Modul
TM
Kontakt
TK
Flexible
TF
Gas
TG
IM-TH-E-7.10
Thermo
