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and to save the new settings. Use the LR buttons to change each digit of the
settings. Press and hold the Exit button to cancel to the main display or press
the EXIT button to cancel and to move to the next parameter. On the last pa
-
rameter, press the Exit button to exit the menu.
7.2.1.3 PT-100 Conversion
The parameters for the PT-100 conversion are R0 (R0), ALPHA (α), DELTA
(δ), and BETA (β). These parameters cannot be changed by the user and are set
to; R0: 100.0, ALPHA: 0.00385055, DELTA: 1.4998, and BETA: 0.109, which
are applicable to the ASTM E1137 type PRTs, also known as DIN-43760 or
IEC-751.
When the PT-100 conversion type is selected, the RANGE and WIRES parame
-
ters are displayed on the right portion of the bottom of the display. The UD
buttons are used to scroll through the parameters. Use the Enter button to
change and save the new settings. Press and hold the Exit button to cancel to
the main display or press the EXIT button to cancel and to move to the next pa
-
rameter. On the last parameter, press the Exit button to exit the menu.
The RANGE parameter is used to select the appropriate resistance range. Gen-
erally, this should be set to 100 ohms.
The WIRES parameter sets the appropriate number of lead wires from the sen-
sor. This parameter can be set to 2-, 3-, or 4-wires. See Figure 4 on page 24 for
the wiring configuration.
7.2.1.4 Callendar-Van Dusen (CVD) conversion
The following equations are used for the Callendar-Van Dusen conversion:
rt C
Rt
tt
t
R
([ ])°=
+− −
⎛
⎝
⎜
⎞
⎠
⎟
⎡
⎣
⎢
⎤
⎦
⎥
⎧
⎨
⎩
⎫
⎬
⎭
≥
0
0
1
100 100
10αδ
1
100 100
1
100
1
100
3
+− −
⎛
⎝
⎜
⎞
⎠
⎟
−−
⎛
⎝
⎜
⎞
⎠
⎟
⎛
⎝
⎜
⎞
⎠
⎟
⎡
⎣
⎢
αδ βt
tt t t
⎢
⎤
⎦
⎥
⎥
⎧
⎨
⎩
⎪
⎫
⎬
⎭
≤
⎧
⎨
⎪
⎪
⎩
⎪
⎪
t 0
The user-defined parameters for the Callendar-Van Dusen conversion are R0
(R0), ALPHA (α), DELTA (δ), and BETA (β). The defaults are R0: 100.0, AL
-
PHA: 0.00385055, DELTA: 1.4998, and BETA: 0.109, which are applicable
with DIN-43760 or IEC-751 type PRTs.
Some probes may be provided with A, B, and C coefficients for the
Callendar-Van-Dusen equation in the following form:
()
()
[]
rt
RAtB t
RAtBtCt tt
([ ])°=
++ ≥
++ + − ≤
⎧
⎨
⎩
⎪
C
0
2
0
23
10
1 100 0
1529 Chub-E4 Thermometer Readout
User’s Guide
40