Druck ADTS 403F, Calibration Manual

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Copyright 1996 Baker Hughes Company.
2 | ADTS 403/405 Calibration Manual–English
Chapter 1. Introduction
• Automatic calibration check and rate calibration as above. These may be performed in either
measure mode or control mode.
• A lower level facility allowing multi-point adjustment of curve fit as well as direct setting of
offset and slope. A computer algorithm provides automation of this process.
1.4 Equipment Specification
Table 1 - 2 details the specification of the equipment required to perform a calibration.
1.5 Media Compatibility
Refer to Table 1 - 2 for the permitted pressure media.
1.6 Preliminary Operations
Review and become familiar with the whole procedure before beginning calibration process.
Allow at least one hour for the ADTS to thermally stabilize after switching on and before
calibration.
Before starting a calibration procedure carry out a leak test, see Section
2
To enable calibration, remove the calibration label and, using a 3 mm AF hexagonal key (Allen
key/wrench), turn the captive, calibration screw counter-clockwise until free.
The pressure standard datum level must be the same as the unit datum level. The datum level of
the unit is on the front panel.
1.6.1 Pressure Source
The calibration menu prompts a selection of an internal or external pressure source.
The internal pressure source selection uses the ADTS in the control mode with the pressure
controllers generating the required pressures for calibration. The required aim value and rate of
change of pressure can be entered. A pressure standard connects to the output and measures
the generated pressure.
The external pressure source selection uses the ADTS in the measure mode with a pressure
standard providing the pressure source.
Table 1 - 1: Calibration Equipment Requirements
Equipment Minimum Specification Purpose
Pressure Standard
(manual or automated)
Range: 27.62 to 3500 mbar
Uncertainty: 32 ppm of reading
+ 0.007 mbar (0.0032 % of reading
+ 0.7 Pa)
To compare against ADTS.
Computer (optional) PC equipped with IEEE 488 Interface. Automate calibration by communication
with ADTS and Pressure Standard.
INFORMATION
Incorrect use of pressure media seriously affects the
measurement accuracy of the ADTS.
Table 1 - 2: Media Compatibility
ADTS Pressure Sensor
a
a. The ADTS pressure sensor type is shown on the LCD display during the power-up self-test sequence.
Permitted Pressure Media
Solartron® Dry air only.
Druck RPT Dry air or dry nitrogen.