27
6 Instrument description
Material of
capillary and
probe
Minimum
bending radius
of capillary
5 mm
Switching point
accuracy
in % of scale span,
referred to setpoint or limit at T
amb
+22°C
in upper third of scale
at scale start
Mean ambient
temperature
error
in % of scale span, referred to limit value.
A deviation of the ambient temperature at the thermostat head and / or the
capillary from the calibration ambient temperature of +22°C produces a shift of
the switching point:
higher ambient temperature = lower switching point
lower ambient temperature = higher switching point
End of scale
Capillary
Probe
up to +200°C
copper, Mat. Ref. 2.0090
1.5 mm dia.
copper, Mat. Ref. 2.0090
brazed
up to +350°C
copper, Mat. Ref. 2.0090
1.5 mm dia.
st. steel, Mat. Ref. 1.4571
brazed
up to +500°C
st. steel, Mat. Ref. 1.4571
1.5 mm dia.
st. steel, Mat. Ref. 1.4571
welded
at extra cost
up to +350°C
st. steel, Mat. Ref. 1.4571
1.5 mm dia.
st. steel, Mat. Ref. 1.4571
welded
+0
-5
%
+0
-10
%
Surface-mounting thermostats with end of scale
< +200°C
≥
+200°C
≤
+350°C
TW
STB/STW (STB)
TW
STB/STW (STB)
due to thermostat head, % per °C
0.08
0.17
0.06
0.13
due to capillary, % per °C per meter length
0.047
0.054
0.09
0.11
Surface-mounting thermostats with end of scale
> +350°C
≤
+500°C
TW
STB/STW (STB)
due to thermostat head, % per °C
0.14
0.12
due to capillary, % per °C per meter length
0.04
0.03
