EUTECH INSTRUMENTS ALPHA DO 1000 DISSOLVED OXYGEN CONTROLLERTRANSMITTER, Alpha-DO 1000 Instruction Manual
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Instruction Manual
αlpha-DO 1000
Dissolved Oxygen Controller/Transmitter
68X242101 Rev 3, 06/04
Preface
This manual serves to explain the use of the αlpha-DO1000 series Dissolved
Oxygen controller/transmitter. The manual functions in two ways: firstly as a stepby-step guide to help the user operate the instrument. Secondly, it serves as a
handy reference guide. This instruction manual is written to cover as many
anticipated applications of the αlpha-DO1000 Dissolved Oxygen
controller/transmitter. If you have doubts in the use of the instrument, please do not
hesitate to contact the nearest Eutech Instruments’ Authorised Distributor.
The information presented in this manual is subject to change without notice as
improvements are made, and does not represent a commitment on part of Eutech
Instruments Pte Ltd.
Eutech Instruments cannot accept any responsibility for damage or malfunction of
the unit due to improper use of the instrument.
Copyright ©1998
All rights reserved.
Eutech Instruments Pte Ltd.
Rev 3, 06/04
Operating Manual alpha DO 1000
Safety Information
The Eutech Controller/ Transmitter shall be installed and operated only in the
manner specified in the Instruction manual. Only skilled, trained or authorized
person should carry out installation, setup and operation of the instrument.
Before powering up the unit, make sure that power source it is connected to, is as
specified in the top label. Failure to do so may result in a permanent damage to the
unit.
The unit has live and exposed parts inside. If it has to be opened, make sure that
the power to the unit is off and disconnected.
The unit is Fuse protected. In the event the fuse has to be replaced, use only those
as specified in the manual.
Operating Manual alpha DO 1000
TABLE OF CONTENTS
1 INTRODUCTION ..................................................................................... 1
1.1 Description of Unit................................................................................................................1
1.2 Applications...........................................................................................................................1
2 ASSEMBLY AND INSTALLATION .........................................................2
2.1 Measurement and Control System .....................................................................................2
2.2 Unit Dimensions....................................................................................................................2
3 ELECTRICAL CONNECTION .................................................................3
3.1 Connection Diagram.............................................................................................................3
3.2 Back Panel.............................................................................................................................4
4 OVERVIEW.............................................................................................. 6
4.1 Keypad and Display..............................................................................................................6
4.1.1 Keypad......................................................................................................................6
4.1.2 Display......................................................................................................................6
4.2 Function Groups...................................................................................................................7
4.2.1 How to view operating parameters without access to change them: ......................7
4.3 Control Concept....................................................................................................................8
5 MEASUREMENT.....................................................................................9
5.1 Display in Measurement mode............................................................................................9
5.1.1 Check electrode performance...................................................................................9
5.1.2 Checking set points...................................................................................................9
5.2 Security Codes.....................................................................................................................10
5.2.1 How to enter and change parameters in Calibration mode ..................................10
5.2.2 Clearing the Calibration security code from the display.......................................10
5.2.3 How to enter and change parameters in Advanced Setup mode ...........................10
5.2.4 Clearing the Advanced Setup Security Code from the Display .............................11
6 CALIBRATION MODE .......................................................................... 12
6.1 Dissolved Oxygen Calibration...........................................................................................12
6.2 Dissolved Oxygen Calibration in % Saturation of Oxygen ...........................................13
7 ADVANCED SET-UP MODE................................................................. 15
7.1 Electrode Offest (OFS), Salinity and Pressure sub-function .........................................15
7.2 Setting the Salinity Value...................................................................................................16
7.3 Setting the Pressure Value (mmHg or Pascal) ................................................................16
7.4 Setting Temperature (Set °C) sub-function .....................................................................17
7.4.1 Selecting Automatic or Manual Temperature Compensation................................17
7.4.2 Temperature calibration (ATC mode only)............................................................17
7.4.3 Setting Manual Temperature Compensation .........................................................18
7.5 Control Relay A/Control Relay B (SP1/SP2) sub-function ............................................18
7.5.1 Entering the Set point 1 (or Set point 2) sub-function ...........................................19
7.5.2 Selecting the Set Point Values................................................................................19
7.5.3 Choosing High or Low Set-points..........................................................................19
7.5.4 Selecting a Hysteresis (Dead Band) Value............................................................20
7.5.5 Setting an On-Delay Time Lag...............................................................................20
7.5.6 Setting an Off-Delay Time Lag...............................................................................21
7.6 Controller (Cntr) Sub-Function........................................................................................22
Operating Manual alpha DO 1000
7.6.1 Entering the Controller sub-function.....................................................................22
7.6.2 Choosing the controller type (limit or proportional).............................................22
7.6.3 Choosing Break/Make Contact Relay Type ...........................................................23
7.6.4 Selecting Proportional Range Value, Xp...............................................................23
7.6.5 Maximum Pulse Length (tPL) or Maximum Frequency (FPF).............................24
7.7 Current Output (rng) sub-function ..................................................................................25
7.7.1 Entering Current Output sub-function...................................................................25
7.7.2 Choosing the Output Type......................................................................................25
7.7.3 Selecting Dissolved Oxygen Value at 0(4)mA........................................................25
7.7.4 Selecting Dissolved Oxygen value at 20mA...........................................................26
7.8 Configuration (ConF) sub-function..................................................................................26
7.8.1 Entering the Configuration sub-function ...............................................................26
7.8.2 Selecting the Units Of Measure (mg/l, ppm or %).................................................27
7.8.3 Selecting the Alarm Time Lag ................................................................................27
7.8.4 Selecting Steady or Pulse Contact for the Alarm Relay ........................................27
7.8.5 Selecting Dissolved Oxygen Probe Type................................................................28
7.8.6 Reverting to Factory Default Settings....................................................................28
7.9 Calibration (CAL) sub-function........................................................................................29
7.9.1 Entering Calibration mode from Advanced Set-up mode ......................................29
8 AUTO/MANUAL MODE ........................................................................ 30
8.1 Auto Mode (Mode After Switch-On)................................................................................30
8.2 Manual Mode ......................................................................................................................30
9 TECHNICAL SPECIFICATIONS ...........................................................32
10 ACCESSORIES..................................................................................... 33
10.1 Assembly Accessories.........................................................................................................33
11 GENERAL INFORMATION ................................................................... 34
11.1 Warranty .............................................................................................................................34
11.2 Packaging.............................................................................................................................34
11.3 Return of Goods..................................................................................................................34
11.4 Guidelines for Returning Unit for Repair .......................................................................34
12 APPENDICES........................................................................................ 35
12.1 Appendix 1 – Jumper Positions for 110 or 230 volts ......................................................35
12.2 Appendix 2 – Salinity vs Temperature (@ 760 mmHg) .................................................36
12.3 Appendix 3 - Explanation on the Function of Hysteresis...............................................37
12.4 Appendix 4 – Limit and Proportional Control Functions..............................................38
1 INTRODUCTION
1.1 Description of Unit
Thank you for purchasing Eutech’s ¼ DIN alpha-1000 series Dissolved Oxygen
process controller. This unit is used for measuring either in % saturation, mg/l or
ppm, one at a time, and the operational mode is switchable from the menu. You can
use this unit to measure Dissolved Oxygen with limit or proportional control. This
controller has many user-friendly and safety features which include:
• Menu-driven program that simplifies set-up
• Built-in Memory backup to ensure that calibration data and other information
are not erased if power supply fails
• Push-button one-/two-point calibration and electrode offset adjustment
from the keypad
• Automatic temperature compensation (ATC)
• Manual temperature compensation with independent setting for calibration
and process temperature
• 0 to 1999 second time delay adjustment on all relays – minimise false alarms
• Separately adjustable high and low set point hysteresis (dead bands)
prevent chattering of relays around the set points
• Three control modes: limit control, proportional pulse length or proportional
pulse frequency
• Large dual display LCD for easy reading with clear multiple annunciators,
alarm status and operational message annunciators
• Two switching contacts as set-point triggering relays and an alarm output
relay
• Separate alarm relay alerts you when set points have exceeded the limits and
if the Pt100 wires are broken or disconnected during the ATC function
• Hold function freezes output current (0/4...20mA) and releases control relays
• LED indicators signal control activities to monitor controller status from a
distance
• Protection against electromagnetic interference - galvanically isolated 0/4 -
20mA output provides safety for data logging and control purposes
1.2
Applications
Use this controller in panel mounted enclosures for applications such as water
treatment and monitoring, galvanic-decontamination, chemical processing, food
processing, clean or waste water control and neutralization process.
Operating Manual alpha DO 1000
2
2 ASSEMBLY AND INSTALLATION
2.1 Measurement and Control System
A typical measurement system consists of:
• an αlpha-DO1000 process controller
• a Dissolved Oxygen probe with integrated temperature sensor Pt100
• an immersion, flow or process assembly
• a final control element such as pump or valve, and
• a chart recorder
Power Mains
(220/110 VAC)
lpha-DO 1000 Controller
Flow Assembly
Measurement Cable
DO Electrode
Chart Recorder
lpha-DO 1000
Alarm / Siren
System
2.2 Unit Dimensions
The field-tested control panel housing is 96 x 96 mm; with protection class IP 54
(front).
max. 175
max. 45
Mounting Cut-Out
Flat Gasket (1mm)
(TobeInsertedByCustomer)
Note: The Taped Corners Have to Be On Top
92
32
56
96
92 + 0.5
92 + 0.5
Operating Manual alpha DO 1000
3
3 ELECTRICAL CONNECTION
ENSURE that the power cable is physically separated from the power
supply.
3.1 Connection Diagram
Signal OutputHold Input
Alarm
Relay 2
Relay 1
Power Mains
DO
mA
-
+
PE/S
PEAC: NL
1
2
5
4
36
78 9
10
11
12 13
14
151715
16
* ) indicated contact positions are for currentless or no error conditions
Pt100
Signal Input DO
-ve
+ve
V
PE/S
DO
18 19 20
21
22
Operating Manual alpha DO 1000
4
3.2 Back Panel
The back panel consists of two connectors. The first connector is the 17-way PCB
edge connector and the other is the 5-way connector.
ENSURE that the power cable is physically separated from the power
supply.
Connection for the 17-way screw terminals (from left to right):
Pin No Description Pin No Description
1 AC mains live wire 10 Alarm relay resting position (NO)
2 AC mains neutral wire 11 Alarm relay common
3 AC mains protective earth wire 12 Alarm relay working position (NC)
4 Low set relay resting position (NC) 13 Hold function switch terminal 1
5 Low set relay common 14 Hold function switch terminal 2
6 Low set relay working position (NO) 15 No connection
7 High set relay resting position (NC) 16 0/4 - 20 mA for -ve connection
8 High set relay common 17 0/4 - 20 mA for +ve connection
9 High set relay working position (NO)
Connections for the 5-way screw terminals (please refer to DO probe wiring
instruction manual):
Pin No Description DO Probe Wiring Colour
18 Pt100 lead 1 White
19 Pt100 sense lead Red
20 Pt100 lead 2 Black
21 Cathode, –ve connection Green
22 Anode, +ve connection Yellow
Operating Manual alpha DO 1000
5
Pt100
RELAY1
LNPE
100mA
(F)
FUSE 250VAC
HOLD
A
LARMRELAY2
NC
-
+
DO Probe
J2
IMPORTANT: The Alarm relay functions as an “Active Low” device
i.e. it switches OFF under Alarm condition. Therefore the Alarm
display device should be connected to the ‘NC’ contacts of the
relay.
Operating Manual alpha DO 1000
6
4 OVERVIEW
4.1 Keypad and Display
4.1.1 Keypad
• Perform rapid calibration
• Allows entry to Set up mode
• Select individual functions within the function group of Set up mode
• Store input data in the Set up mode
• Start calibration in the calibration mode
• Select various function groups in the Set up mode.
• Set parameters and numerical values in sub functions of Set up mode
If pressed continuously, the setting speed increases
• Control the relays in the MANUAL function
• Return to the Measurement mode when both keys are pressed together
• Switch between AUTO and MANUAL relay operation using a code
• Display limit set-point values for the switch contacts in AUTO relay operation
mode
• Switch between RELAY A and RELAY B in MANUAL relay operation mode
4.1.2 Display
The LCD display features two numerical displays that show status messages and
measured values for easy, quick reference. The display provides short-text
information for setting parameters and configuration.
MEAS CALSETUPHOLD
ppmt
mg/l
%
ATC
°
C
READY
-8.8.8.8
-1.8.8.8
• HOLD: Relay position and current output are frozen
• SETUP: Set-up mode of function groups
• MEAS: Measurement mode
• CAL: Calibration mode of Dissolved Oxygen
• READY: Comes on after a successful calibration
• ATC: Comes on in the ATC mode. Disappears in the
Manual temperature Compensation mode. “ATC” flashes
if the temperature probe is faulty in its ATC mode
• Display for RELAY A/B. Green LED indicates measured value within limit while RED
LED indicates measured value outside limit.
• Alarm display if limit value overshoot or the ATC connection is broken.
Operating Manual alpha DO 1000
7
4.2 Function Groups
The main function and sub-function groups are organised in a matrix format for
configuration and selection of parameters. The main function groups are:
Offset adjustment (OFS). See Section 7.1.
Temperature Measurement / compensation settings (SEt °C). See Section 7.4.
Control relay 1 configuration (SP1). See Section 7.5.
Control relay 2 configuration (SP2). See Section 7.5.
Control type (Cntr). See Section 7.6.
Current output (rng). See Sections 7.7.
Configuration (ConF). See Section 7.8.
Calibration (CAL dO). See Sections 6 & 7.9.
HOLD SETUP HOLD SETUP HOLD HOLDSETUP SETUP
Sp1
ofs
Sp2
HOLD SETUP
°
C
HOLD SETUP
Cal
HOLD SETUP HOLD SET UP
The set-up parameters can be viewed or changed by entering a security code. See
Section 5.2 for security code information.
4.2.1 How to view operating parameters without access to change them:
1. Press the ENTER key. The display will prompt
the user to enter a security code (S.Cd). Leave
the security code at “000” (do not enter a
security code).
2. Press ENTER key again. This allows you only
to view (not change) any sub-functions’ settings.
3. Press the ▲ or ▼ keys to scroll through the sub-functions.
4. Press the ENTER key at a particular sub-function to view in detail.
5. Press the ENTER key to return to the sub-function menu.
6. Press the ▲ or ▼ keys simultaneously (as an Escape key) at any time to
return to the Measurement mode.
Note: To simplify operations, the controller will not display parameters
that are not relevant to a particular sub-function. For example: If
the user set the controller for Limit control, it will not display pulse
length/frequency settings.
000
Operating Manual alpha DO 1000
8
4.3 Control Concept
The main function and sub-function groups are organised in a matrix format as
shown below. These functions can be accessed via the front keypad for
configuration and selection of parameters.
MEASURE
CODE
OFFSET
SET C
SET-POINT 2
CONTROLLER
OUTPUT
RANGE
CONFIGURATION
CALIBRATION
SET-POINT 1
Set value 1
Switch On /
Off ATC
Set Offset Set Salinity Set Pressure
Controller type
Process temp.
(MTC)
MIN / MAX
Function
Set value 2
N.O./N.C.
contact
mg/l at 0/4 mA
Current Outpu t
0..20/4..20 mA
Calibration
Points
mg/l at 20 mA
Set Measuremen t
Units
Electrode
Status
Alarm D elay
Hysteresis 2
Calib. temp.
(MTC)
Calibrate Pt100
Pick-up delay
contact 1
Dropout delay
contact 2
Reset to factory
default sett ings
Calibrate
MIN / MAX
Funct ion
Hysteresis 1
Pick-up delay
contact 2
Dropout delay
contact 1
Proportional
range X
P
Cycle time bzw.
max. frequency
Alarm contact
cont./wiper c ontact
Electrod e Type
The controller offers two levels of password protection: (1) for direct access to
calibration function and (2) for setting or editing specific controller parameters or
functions in the SETUP mode to suit individual requirements.
Note: The passwords are not user-defined and have been set by
factory. It is very important to keep these passwords strictly
confidential to avoid unauthorised tampering of the system at all
times.
Note: If the user reads parameters only, the controller automatically
reverts to Measurement mode if none of the keys is pressed for
30 seconds.
Operating Manual alpha DO 1000
9
5 MEASUREMENT
5.1 Display in Measurement mode
When the controller is initially powered on, it automatically enters into the
Measurement mode after the large dual LCD displays all segments briefly.
The upper display shows the measured Dissolved Oxygen value, while the lower
display shows the temperature value. Annunciators at the right side of the display
indicate measurement units: ppm, mg/l or % measurement. Similarly annunciators
or icons at the top or left side of the display shows the current status of controller,
e.g. “HOLD”, “SETUP”, “MEAS”, “CAL”, “READY”, etc.
5.1.1 Check electrode performance
To read current electrode slope and offset values without changing them:
1. Press the CAL key followed by the ENTER key without adjusting the
security code (leave code at “000”). The upper display shows the condition
of the probe. The lower display reading shows the temperature reading.
2. Press the ENTER key a second time to return to Measurement mode.
Note: If security code is changed to a value other than “000”,
pressing the ENTER key will return to the Measurement mode,
without displaying electrode information.
5.1.2 Checking set points
To read current set point values without changing them:
1. Press the RELAY Selection (Rel A / Rel B) key. The upper display shows
the set point for Relay A; the lower display shows “SP1”.
2. After two seconds the upper display shows the set-point value for Relay B;
the lower display shows “SP2”.
3. After an additional two seconds, the controller returns to the Measurement
mode.
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