Copyright 2011 Baker Hughes Company.
14 | DPS 8000 Instruction Manual–English
4.7.8 0x2209 – The Temperature Calibration Gain
Refer to “0x2200 – To Change the Calibration Data” on page
13. Use 0x2209 (Temperature Gain)
to apply a correction to the compensated source temperature.
Figure
7: Temperature Calibration Gain
4.7.9 0x220A – The Temperature Calibration Offset
Refer to “0x2200 – To Change the Calibration Data” on page
13. Use 0x220A (Temperature
Offset) to apply a correction to the compensated source temperature.
Figure
8: Temperature Calibration Offset
4.7.10 0x220D to 0x2218 – The Filter System
The DPS
8000 sensor can support a wide range of sample rates and filters to give a choice of
speed and accuracy. There are five filters, preset to a selection of values. Each filter is built of two
parts; a pre-scaler and a group of coefficients. It is beyond the scope of this manual to describe
the creation of these values.
The data dictionary item “Selected FIR Filter” at 0x2217 is used to choose a filter. When changing
to another filter, be aware of the 3
dB settling times below before taking new values.
4.7.11 0x2304 – The Tag for the Type of Data
Use object 0x2304 (Tag) to identify the type of data that the pressure transducer supplies
(maximum: 10 characters). For example: Oil-mbar.
4.8 To Change the Operation – Objects: 0x6000
–
0x6FFFF
4.8.1 0x6120 to 0x6124 – The Scale Data for Pressure and Temperature Output
The pressure transducer uses a two-point calibration to calculate the pressure output. The two-
point calibration includes the relation between the Field Value (FV) units and the Process Value
Filter Preset
Filter Type
Cut-off Frequency
3 dB Settling Time
1
Averaging 10 samples.
44.3
Hz
22
ms
2
a
a. Factory set default filter setting.
Averaging 50 samples.
8.86
Hz
100
ms
3
Butterworth low pass.
1
Hz
1000
ms
4
Butterworth low pass.
10
Hz
100
ms
5
Butterworth low pass.
17.18
Hz
60
ms
Compensated
source
temperature
Object 0x2209:
Temperature Gain
x Gain
correction (°C)
Object 0x6130 02:
Temperature Value
Process Value (°C)
Compensated
source
temperature
Object 0x220A:
Temperature Offset
± Offset
correction (°C)
Object 0x6130 02:
Temperature Value
Process Value (°C)
Содержание Druck DPS 8000 Series
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