Campbell SAT ARGOS Bedienungsanleitung Seite 344

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Seitenansicht 343
ZENO
®
-3200 USER MANUAL
Coastal Environmental Systems (206) 682-6048 Page D-40
E1 Process Error Code
Assumptions: Sensor data is scaled to show a voltage ratio of V-measured divided by
V-excitation. The linear scale factor in the sensor input (line item 14)
should be set equal to 1 / V-excitation
The data value inputted into Line Item #4 must represent the voltage ratio produced by a voltage divider
circuit where R1 is a thermistor. The sensor scale coefficient should multiply the sensor reading by the
inverse of the excitation value.
This process converts the non-linear sensor voltage ratio into a resistance value for the NTC thermistor
and applies the Steinhart-Hart thermistor equation to the resistance value to derive a temperature value:
1
3
T
ABRC R ln (ln ) .
Coefficients A, B, C and R in the Steinhart-Hart thermistor equation correspond to Line Items #5 through
#8 respectively. Values for these coefficients for the YSI 44034 Thermistor are described in Appendix C.
The process further calculates an average temperate across the Sample Duration after applying the
Steinhart-Hart thermistor equation. Data output #1 contains the average temperature as calculated across
the Sample Duration. Data output #1 contains the immediate temperature for the most recent data
referenced by Line Item #4.
Line Items #9 through #11 are used in the event that a valid temperature range needs to be checked
without having to add an additional alarm process. If the average temperature calculated by this process
exceeds the upper and lower limits as specified in Line Items #9 and #10 respectively, ZENOSOFT® will
set the bit in the Global BIT
369
as specified in Line Item #11.
4.2. Paroscientific Barometer Process
Inputs: 4 Temperature period in micro-seconds
5 Pressure period in micro-seconds
6 U0 (Paroscientific equation coefficients from calibration sheet)
7 Y1
8 Y2
9 C1
10 C2
11 C3
12 D1
13 T1
14 T2
15 T3
Outputs: 1 Average pressure value in mbar
2 Average temperature value in degrees Celsius
3 Immediate pressure value (last value read)
4 Immediate temperature value (last value read)
E1 Process Error Code
369
Refer to Category #3, Process #1.
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