Druck DPI 520 User manual

K163 Issue No. 3
i
DPI 520
RACK MOUNTED PRESSURE CONTROLLER
DPI 520 Pressure Controller
Software Issue
This User Manual supports Software Issue No. 3.XX
©Druck Limited 1998
This document is the property of Druck Limited and may not, either in part or whole, be copied or
otherwise reproduced, communicated in any way to third parties, or stored in any Data Processing
System, without the express written authority of Druck Limited.
DPI 520 User Manual

K163 Issue No. 3
ii DPI 520 User Manual
SAFETY
The Manufacturer has designed this product to be entirely safe when operated
correctly.
●●
●●
●Please pay close attention to the Safety Instructions outlined on this page and
elsewhere in this manual. They have been designed to protect the user from
personal injury and the equipment from damage.
●●
●●
●Potentially hazardous operations are indicated in the text by
means of a hazard warning triangle. Specific warnings
relating to each section of the manual are given at the
beginning of that section. On the instrument, this symbol
indicates that the user should refer to the User Manual.
●●
●●
●Please observe the installation advice and any operational limits given in this
manual.
●●
●●
●This equipment must only be used for the purpose for which it was designed
Pressure Safety
Do not permit pressures greater than the Safe Working Pressure to be applied to
the instrument. The specified Safe Working Pressure for the instrument is stated
in the Specification section of this manual.
Electrical Safety
The instrument is designed to be completely safe when used with Options and
Accessories supplied by the manufacturer for use with the instrument.
Toxic Materials
During normal operation it is not possible for the user to come into contact with any
hazardous substance which might be employed in the construction of the instru-
ment. The use of hazardous materials in the construction of this instrument has
been minimised.

K163 Issue No. 3
iii
Repair and Maintenance
This publication contains information and warnings which must be followed for safe
operation and to maintain the equipment in a safe condition. Use qualified*
personnel and good engineering practice for all procedures in this publication.
The operator must not use this equipment for any other purpose than that stated.
Do not apply a pressure greater than the maximum pressure stated.
* A qualified person must have attended a product training course given by the
manufacturer or appointed agent and successfully completed the training
course on this equipment.
This product meets the essential protection requirements of the
relevant EEC directives. Further details of applied standards may
be found in the product specification.
Safety

K163 Issue No. 3
iv DPI 520 User Manual
ABBREVIATIONS
NOTE: Abbreviations are the same in the singular and plural.
ac alternating current
atm atmosphere
°C degrees Celsius
°F degrees Fahrenheit
COM common
cm2centimetre squared
contd continued
dc direct current
DMM digital multimeter
DUT device under test
ENT enter
FS full-scale
ft feet
kg kilogram
LSD Least significant digit
Pa Pascal
PIN personal identification number
mA milli Amperes
mH2O4 metres of water at 4°C
mm milli metres
MSD most significant digit
N/C No Connection
No. number
PRESS pressure
PTX pressure transmitter
RDG reading
RS 232 serial data transmission standard
SCPI Standard command for programmable
instrumentation
Ttare
VAC vacuum

K163 Issue No. 3
v
Contents
1 INTRODUCTION ............................................................................................. 1-1
1.1 Instrument Specification .................................................................................. 1-2
1.2 Applications ..................................................................................................... 1-6
1.2.1 Control by Remote Computer via IEEE 488 ........................................ 1-6
1.2.2 Control by Remote Computer via RS232 ............................................ 1-7
1.2.3 Control by Remote User Interface ....................................................... 1-7
2 FUNCTIONAL DESCRIPTION ........................................................................ 2-1
2.1 General............................................................................................................ 2-1
2.2 Instruments Electronics ................................................................................... 2-1
2.2.1 Digital Electronics ................................................................................ 2-1
2.2.2 Analogue Circuit Operation .................................................................. 2-3
3 INSTALLATION ............................................................................................... 3-1
3.1 Safety Instruction ............................................................................................ 3-1
3.1.1 Input/Output Connections .................................................................... 3-1
3.1.2 Rack Mounting ..................................................................................... 3-1
3.2 Electrical Connections .................................................................................... 3-3
3.2.1 Electrical Safety Instructions ................................................................ 3-3
3.2.2 Power Supply Connections .................................................................. 3-3
3.3 Communications Interface Connections ......................................................... 3-5
3.4 IEEE 488 Interface .......................................................................................... 3-5
3.4.1 Single Unit Installation ......................................................................... 3-7
3.4.2 Multiple Unit Installation ....................................................................... 3-8
3.5 RS232 Interface .............................................................................................. 3-9
3.5.1 General ................................................................................................ 3-9
3.5.2 Connecting to a Computer ................................................................... 3.11
3.6 Connection of Remote User Interface ............................................................. 3-18
3.7 Analogue Output Socket .................................................................................3-18
3.8 Pressure Connections ..................................................................................... 3-19
3.8.1 Pressure Safety Instructions ................................................................3-19
3.8.2 Connection ........................................................................................... 3-19
3.8.3 Obtaining the Best Performance .....................................................................3-23
3.8.4 Maximising Valve Life .......................................................................... 3-24
3.8.4 Control at Zero Gauge Pressure without a Vacuum Pump ................. 3-25
3.9 Set-up Mode ....................................................................................................3-26
3.9.1 General ................................................................................................ 3-26
3.9.2 Set-up MENU ....................................................................................... 3-28
Keyboard (Unlocked) ................................................................3-28
Recall defaults ........................................................................... 3-29
Set-up controller ........................................................................ 3-30
Set PIN ....................................................................................... 3-32
Show S/W Revision .................................................................. 3-33
Self Test Electronic .................................................................... 3-33
Self Test Pneumatic ................................................................... 3-34
3.9.3 Set-up COMMUNICATIONS ................................................................ 3-36
3.9.4 Set-up More (Scale, Zero, More) ......................................................... 3-45
3.9.5 More (Set-point and Rate) ................................................................... 3-47
.
Section Page

K163 Issue No. 3
vi DPI 520 User Manual
Continued.....
4 OPERATION ................................................................................................... 4-1
4.1 Local Mode ...................................................................................................... 4-1
4.2 Remote Mode .................................................................................................. 4-1
4.3 Control Codes ................................................................................................. 4-1
4.3.1 Control Code Format ........................................................................... 4-2
4.3.2 Implementation of checksums ............................................................. 4-3
4.4 Command Description ..................................................................................... 4-6
4.4.1 Set to Local Mode - 'M' ........................................................................ 4-6
4.4.2 Set Mode - 'R' ...................................................................................... 4-6
4.4.3 Set Scale Unit - 'S' ............................................................................... 4-7
4.4.4 Units - 'U' .............................................................................................. 4-7
4.4.5 Data Select - 'D' ................................................................................... 4-7
4.4.6 Output Data Format - 'N' ...................................................................... 4-7
4.4.7 Interrrupt -'I' ......................................................................................... 4-9
4.4.8 Wait - 'W' ............................................................................................. 4-9
4.4.9 Controller On/Off - 'C' ........................................................................... 4-10
4.4.10 Pressure Set-Point - 'P' ........................................................................ 4-10
4.4.11 Ratio - '/' ............................................................................................... 4-10
4.4.12 Preset - '*' ............................................................................................. 4-10
4.4.13 Error Reporting On/Off - '@' ................................................................. 4-11
4.4.14 Rate - 'J' ............................................................................................... 4-11
4.4.15 Zero Instrument - '01' ........................................................................... 4-11
4.4.16 Rate value - 'V' ..................................................................................... 4-11
4.4.17 Isolation Valve Open/Close - 'E' ......................................................... 4-11
4.4.18 Open Isolation valve - 'F' ..................................................................... 4-12
4.4.19 Tare value - 'B' ..................................................................................... 4-12
4.4.20 Tare On/Off - 'T' ................................................................................... 4-12
4.5 Output Code Format ....................................................................................... 4-13
Parameter Definitions .......................................................................... 4-14
Error Status Code ................................................................................ 4-18
4.6 RS232 Specific ................................................................................................ 4-19
4.6.1 Operation Using RS232 ....................................................................... 4-19
Direct mode ................................................................................. 4-20
Printer Mode ............................................................................... 4-21
Addressed Mode ......................................................................... 4-21
4.6.2 RS232 Output Code Format ................................................................ 4-24
4.7 Operation Using IEEE 488 .............................................................................. 4-26
4.7.1 Serial Poll ............................................................................................. 4-27
4.7.2 Standard IEEE Commands .................................................................. 4-27
4.7.3 IEEE Bus Time-out .............................................................................. 4-27
4.7.4 RS232 Command Specific Commands ............................................... 4-28
4.7.5 DPI 500 Mode ...................................................................................... 4-28
4.7.6 ASCII Values ........................................................................................ 4-29
Section Page

K163 Issue No. 3
vii
Contents
5 CALIBRATION ................................................................................................ 5-1
5.1 Calibration Check ............................................................................................ 5-1
5.2 Calibration Adjustment .................................................................................... 5-2
5.2.1 General Procedures ............................................................................. 5-3
5.3 Using the Calibration Menu ............................................................................. 5-4
5.3.1 Test ...................................................................................................... 5-4
5.3.2 Calibration (Cal) ................................................................................... 5-5
5.4 Checking Linearity Calibration ........................................................................ 5-6
5.5 Full Scale and Zero Adjustment ...................................................................... 5-7
5.6 Non-Linearity Adjustment ................................................................................ 5-8
6 MAINTENANCE .............................................................................................. 6-1
6.1 Safety Instructions ........................................................................................... 6-1
6.2 Fuse Replacement .......................................................................................... 6-2
6.3 Replace Vent, Source and Outlet Manifold Filters .......................................... 6-4
6.4 Cleaning .......................................................................................................... 6-4
6.5 Fault Finding ................................................................................................... 6-4
6.5.1 Error Codes .......................................................................................... 6-5
6.5.2 Controller Fault .................................................................................... 6-6
6.6 Approved Service Agents ................................................................................ 6-7
Section Page

K163 Issue No. 3
viii

K163 Issue No.3
1: Introduction 1-1
1
1 INTRODUCTION
Description
The DPI 520 is a programmable pneumatic pressure controller intended for
applications in automatic pressure testing and calibration.
A rugged Druck piezo resistive transducer measures pressure and is compen-
sated to standard or enhanced accuracy as required.
Dual loop control provides extremely accurate and repeatable setting of pressure
output.
The Druck pneumatic control actuator achieves this level of control whilst also
providing fast response and very low gas supply consumption.
Only 2U of 19 inch rack is required to house the unit which is controlled remotely
by a host computer for fully automatic applications or from one of the range of
Remote User Interfaces for manual or semi-automatic applications
Pressure demands via a digital interface are converted by the controller into a
regulated pressure supplied from a line or bottle source. Both RS232 and IEEE 488
interfaces are provided as standard. The controller module has both control and
measure modes. Up to three controllers may be ‘stacked’ and controlled from a
single User Interface or computer.
Two levels of accuracy enhancement are available as Options A1 and A2.
Option B provides negative pressure calibration.
The controller is interchangeable with a DPI 510 at IEEE and RS232
communications level. Essentially the DPI 520 is compatible with the Druck control
software products InteCal and ACS.
A remote User Interface (RUI 100 and RUI 101) is available giving manual control
and display on one, two or three DPI 520 in a 'stacked' system. In this way, control
is provided to a high accuracy over a wide pressure range. See the RUI 100/101
Product Note for details.

K163 Issue No. 3
1-2 DPI 520 User Manual
1.1 Instrument Specification
Pressure Ranges
Output Pressure
............................................................................................. 0 to 70 bar absolute
............................................................................................... -1 to 70 bar gauge
maximum 2 bar line pressure on gauge units
Maximum Safe Working Pressure
.....................................................................................125 % full scale pressure
Source Pressure Range
Positive pressure ............................................................. 105 to 115 % full scale
Negative pressure ............................................... Lowest pressure used less 5%
Accuracies
Assuming regular zeroing of the instrument, the following figures apply.
Combined non-linearity, hysteresis and repeatability
Standard Instrument ................................................................ ± 0.05% full scale
Option A1 .................................................................. Refer to Options, Page 1-5
Option A2 .................................................................. Refer to Options, Page 1-5
Temperature Coefficient
The temperature coefficient averaged over 10° to 30°C.
Standard Instrument ......................................................... ± 0.01 % Reading/°C.
Options A1 and A2 .................................................... Refer to Options, Page 1-5
Stability
NOTE: The following figure indicates 90 day stability and assumes
regular use of the zero facility.
............................................................................................. ± 0.015% of reading
Negative Pressures - Option B
Specification as per positive pressure but calculated as a percentage of the
positive full scale.
Controller Performance
Controller Stability ............................................................ ± 40 ppm of Full Scale
Fill Rate ............................................................ Dependant upon system volume