Calibration; Before You Start; Procedures: Ma Input; Procedures: Ma Output - Baker Hughes Druck DPI 880 Manual Del Usuario

Calibration

Note: Druck can provide a calibration service that is traceable
to international standards.
We recommend that you return the instrument to the
manufacturer or an approved service agent for calibration.
If you use an alternative calibration facility, make sure that it
uses these standards.

Before you start

To do an accurate calibration, you must have:
• the calibration equipment specified in Table 8.
• a stable temperature environment: 70 ± 2°F (21 ± 1°C)
Table 8: Calibration equipment
Function Calibration equipment
(ppm = parts per million)
mA OR mA calibrator.
mA (Dual ... )
Accuracy - mA input/output: Table 10/11
Accuracy - mA (Dual Function): Table 10
mV OR mV calibrator.
TC (mV) Accuracy - mV input/output: Table 12/14
Accuracy - TC (mV): Table 20
Volts OR Volts calibrator.
Volts (Dual ... ) Accuracy - Volts input/output: Table 13/ 15.
Accuracy - Volts (Dual Function): Table 13
Hz 1) Frequency meter
Total error: 7 ppm or better
Resolution: 8 digits (minimum)
2) Signal generator
IDOS UMM only. Refer to the user manual for the IDOS
UMM.
CJ - Standard RTD probe
Accuracy: 50 mK for 23 to 82.4°F (-5 to 28°C)
- Digital thermometer
Accuracy: 10 mK
- Standard 0 resistor
RTD Ohms
- aStandard resistor (): 100, 200, 300
Tolerance: 50 ppm + 0.6 ppm/°C + 5 ppm/year
- *Standard resistor (): 400, 1k, 2k, 4k
Tolerance: 10 ppm + 0.6 ppm/°C + 5 ppm/year
An ohmmeter or an RTD measurement system with
RTD Ohms the specified excitation currents (Table 19).
a Or an equivalent resistance simulator
Before you start the calibration, make sure that the time and
date on the instrument are correct (Table 1).
Selection sequence:
 Task selection menu  Set Up (Table 1)  Calibration 
Display: Enter
1 2
Calibration PIN


+
 
Factory PIN = 4321
Select Function
5a 5b
(If applicable)


(Table 9)
Table 9: Calibration options
Options Description ... To calibrate the specified input/output:
... 
... ... = mA, mV, Volts, Hz, RTD (Ohms), TC (mV)
IDOS UMM only. To calibrate the specified IDOS UMM.
Refer to the user manual for the IDOS UMM.
CJ To calibrate the cold junction channel.
K0405 Revision B
Menu:
3 4 5
Select Channel


(Table 9)
mA (Dual ... ) To calibrate the mA (Dual Function) input.
Volts (Dual ... ) To calibrate the Volts (Dual Function) input.
Calibration Due: To set the date of the next calibration
for the instrument.
After the specified calibration date, there is a warning
message. There is a selection box to stop the warning.
To change the calibration PIN (Personal Identification
Number).
When you select a channel/function, the display shows the
applicable instructions to complete the calibration.
When the calibration is complete, select Calibration Due and
set the new calibration date for the instrument.

Procedures: mA input

1. Connect the instrument to the calibration equipment
(Figure 3).
2. Let the equipment get to a stable temperature
(minimum: 5 minutes since the last power on).
3. Use the calibration menu (Table 9) to do a three-point
calibration (-FS, Zero and +FS)
applicable instructions to complete the calibration.
4. To make sure that the calibration is correct, select the
applicable mA input task (Table 2) and apply these
values:
• mA: -55, -40, -24, -18, -12, -6, 0 (open circuit)
Then mA: 0, 6, 12, 18, 24, 40, 55.
5. Make sure that the error is in the specified limits
(Table 10).
Table 10: mA input error limits
Applied Calibrator
mA error
(mA)
±55 0.002 2
±40 0.001 8
±24 0.001 4
±18 0.000 4
±12 0.000 3
±6 0.000 2
0 (open circuit) -

Procedures: mA output

1. Connect the instrument to the calibration equipment
(Figure 1).
2. Let the equipment get to a stable temperature
(minimum: 5 minutes since the last power on).
3. Use the calibration menu (Table 9) to do a two-point
calibration (Zero and +FS). The display shows the
applicable instructions to complete the calibration.
4. To make sure that the calibration is correct, select the
applicable mA output task (Table 2) and set these output
values:
• mA: 0.1, 4, 12, 20, 24
5. Make sure that the error is in the specified limits
(Table 11).
Table 11: mA output error limits
Output Calibrator
mA error
(mA)
0.1 0.000 006
4 0.000 20
12 0.001 4
20 0.002
24 0.002 3
* FS = Full scale
*
. The display shows the
Permitted
DPI 880 error
(mA)
0.005
0.004
0.003
0.003
0.002
0.002
0.001
Permitted
DPI 880 error
(mA)
0.001
0.001
0.001
0.002
0.002
11
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