
ZENO
®
-3200 USER MANUAL
Coastal Environmental Systems (206) 682-6048 Page D-41
Assumptions: This process is intended for the Paroscientific barometer model 216B-
101
This process takes the pressure (T) and temperature (U) period measurements, applies this data to the
Paroscientific third order logarithmic equation to derive the immediate temperature (Temp) and pressure
(P) values. The coefficients listed in Line Items #6 through #15 are used as follows:
The average temperature and average pressure values are calculated from their respective immediate
values across the Sample Duration.
4.3. Thermocouple Process
Inputs: 4 Thermocouple voltage from any sensor, process or constant output.
5 Thermocouple type code (0 = J, 1 = K, 2 = T)
Outputs: 1 Average temperature in ºC
2 Most recent temperature in ºC
E1 Process error code
Assumptions: The data inputted into Line Item #4 MUST BE in volts from a
thermocouple. The process converts the value in volts to a value in
microvolts (µV)
The Thermocouple Process converts the extremely nonlinear voltage supplied by a thermocouple into an
equivalent temperature. The three most common types of thermocouples are supported by this process:
Type-J, Type-K, and Type-T.
To convert the nonlinear thermocouple voltage into temperature, a ninth-order polynomial is used:
The above polynomial approximation is only good over a limited range of voltages. Further, for different
voltage ranges, different values are used for the polynomial coefficients. The following table describes
the valid range of voltages in microvolts. Different coefficients are used for the polynomial equation for
different voltage ranges.
2
1211
2
4
2
112
2
13
4
1
112
2
13
01
68.965517
1
1
UYUYTemp
CDTP
T
TUTUT
T
DD
CUCUCC
UUU
01
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
aVaVaVaVaVaVaVaVaVaT
Comentários a estes Manuais